Final Report by Three-phase Induction Motor
Evaluation Standards Subcommittee, Energy Efficiency
Standards Subcommittee of the Advisory Committee for
Natural Resources and Energy

2013
Ministry of Economy, Trade and Industry

The three-phase induction motor evaluation standards subcommittee deliberated on
evaluation standards, etc. for manufacturers and importers of three-phase induction
motors (hereinafter referred to as “manufacturers, etc.”) for the purpose of improving
the performance of these products (the deliberation included the scope, categories,
target fiscal year, target standard values, measurement methods, etc. of three-phaseinduction motors covered by this report) and prepared this report as follows.
1. Target scope [See Attachment 1, Attachment Sheet 1 and Reference 2.]
Three-phase induction motors covered by this report are those which satisfy all of
the following conditions from (1) to (7) based on the scope of three-phase induction
motors specified by Japanese Industrial Standards JIS C 4034-30 “Rotating electricalmachines - Part 30: Efficiency classes of single-speed, three-phase, cage-induction
motors (IE code)” [excluding those which are completely integrated into othermachines (for example, pumps, fans, compressors, etc.) and cannot be tested
separately from such machines and those made solely for inverter driving (those
whose base frequency is 50 Hz ±5% or 60 Hz ±5% are included in the scope).
1) Those whose rated frequency or base frequency is either 50 Hz±5% or 60 Hz±5% orcompatible with both 50 Hz ±5% and 60 Hz ±5%2) Those whose speed is single
3) Those whose rated voltage is 1,000 V or lower4) Those whose rated output is 0.75 kW or higher and 375 kW or lower5) Those whose number of poles is either 2 poles, 4 poles or 6 poles
6) Those whose duty type of use is either (a) or (b) below(a) Those which are continuously operated at a constant load for sufficient time toallow the motor to reach thermal equilibrium (abbreviation: S1)(b) Those which are repeatedly used for the time shorter than the time in which the
motor reaches the thermal equilibrium, making the period of time when the
motor operates at a constant load and the period of time when it is stopped one
cycle (abbreviation: S3), where the rated cyclic duration factor is 80% or higher
7) Those driven by a commercial power supply (capable of continuous operating direct
on-line)However, those whose thermal class specified in JIS C 4003 “Electrical insulation –Thermal evaluation and designation” is 180 (H), 200 (N), 200 (R) or 250, those which
are delta-star starting types, those which are designed for vessels and ocean
structures (floating facilities for production, storage or loading of oil, oil platforms,etc.), those which are structured for the use in liquid, those which are explosion-proof
types, those whose ratio of difference between the synchronous speed and therotational speed of the rotor is 5% or higher in case of output 0.75 kW or higher and
110 kW or lower, or 3% or higher in case of output exceeding 110 kW and 375 kW orlower (High slip motors), those designed for gates of dams or flood gates (Water gate
motors), those which cover their stators or rotors with metal materials (Canned1motors), those used in an extremely low temperature environment (those designed touse ambient temperature lower than –20°C) and, of those made solely for inverter
driving, those which are external fan cooling types are excluded from the scope.
2. Matters to be considered as evaluation standards for manufacturers, etc.
(1) Target fiscal year [See Attachment 2.]
The target fiscal year shall be FY2015.
(2) Categories for setting targets and target standard values [See Attachments 3 and 4.]
As regards three-phase induction motors to be shipped by manufacturers, etc. in
the domestic market in the target fiscal year, the values obtained by calculating
weighted averages of the energy consumption efficiency [%] of those products
measured by the way stated in paragraph (3) below, i.e. weighted averages
calculated for each category of the following table according to the number of units
shipped by each business operator, considering the coefficients stated in the notes 1
to 4 below, shall not be below the target standard values. However, as regards
motors using voltage and frequency corresponding to those of the domestic andoverseas markets, this applies to the energy consumption efficiency of the voltage
and frequency corresponding to those of the domestic market.
Table 1 Categories and Target Standard Values of Three-phase Induction Motors
Category

1
2
3
4
5
6
7
8
9
10
11
12

Rated frequency
or base frequency

Rated output
0.75 kW or higher, lower than 0.925 kW

Targetstandard
value [%]
85.5

100 kW or higher, lower than 130 kW

86.5
89.5
91.7
92.4
93.0
93.6
94.1
94.5
95.0
95.4
95.8

13

130 kW or higher, 375 kW or lower

96.2

14
15
16

0.75 kW
1.1 kW
1.5 kW

82.5
84.1
85.3

0.925 kW or higher, lower than 1.85 kW
1.85 kW or higher, lower than 4.6 kW
4.6 kW or higher, lower than 9.25 kW
9.25 kW or higher, lower than 13 kW
13 kW or higher, lower than 16.75 kW

60 Hz

16.75 kW or higher, lower than 26 kW
26 kW or higher, lower than 33.5 kW
33.5 kW or higher, lower than 41 kW
41 kW or higher, lower than 50 kW
50 kW or higher, lower than 100 kW

50 Hz

2

17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

2.2 kW
3 kW
4 kW
5.5 kW
7.5 kW
11 kW
15 kW
18.5 kW
22 kW
30 kW
37 kW
45 kW
55 kW
75 kW
90 kW
110 kW
132 kW
160 kW
200 to 375 kW
Others

50 Hz

3

86.7
87.7
88.6
89.6
90.4
91.4
92.1
92.6
93.0
93.6
93.9
94.2
94.6
95.0
95.2
95.4
95.6
95.8
96.0
Note 2

Note 1. The evaluation is made using the values obtained by multiplying the energy
consumption efficiency obtained by measurement by the coefficients a to flisted in Table 2 and Table 3, then rounding off the second place after thedecimal point of those values thus obtained.
In case of output other than rated output listed in Table 2 (60 Hz), if theoutput in question is equal to or higher than the middle point between two of
the rated output which are one class higher and lower than the output inquestion, the coefficients a to c of the higher rated output are used, and if theoutput in question is lower than said middle point, the coefficients a to c of
the lower rated output are used.
Table 2 Coefficients of Each Output of 60 Hz

Table 3 Coefficients of Each Output of 50 Hz

Rated output

2 poles

4 poles

6 poles

Rated output

2 poles

4 poles

6 poles[kW]

Coefficient a

Coefficient b

Coefficient c[kW]

Coefficient d

Coefficient e

Coefficient f

1.11041.02981.01171.03471.01131.02461.01661.01541.02201.02071.02071.01841.01611.01501.0192
1.01381.0042
1.00841.00841.00421.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.03640.9886
0.97741.00001.00001.0077
1.0077
1.00761.0142
1.00651.00651.00001.00431.00531.00951.0042
1.00421.00001.0042
1.0042

1.02231.01691.01311.0093
1.00691.00571.00451.00331.0022
1.0022
1.0022
1.0032
1.0032
1.00211.00211.0032
1.0032
1.00211.00211.00211.00211.00211.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.04561.0383
1.03391.02851.02451.02071.0182
1.01461.0122
1.00991.00981.0087
1.00751.00641.00531.00531.0042
1.0032
1.0032
1.00211.00211.0021

0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

0.75
1.1
1.5
2.2
3
4
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
132
160
200 to 375

4Note 2. The target standard value (η: %) of category 36 listed in Table 1 shall be thevalue calculated by the following formula.

η ＝ A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D
Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A, B, C and D: Interpolation coefficientsA
0.0773B-1.8951C
9.2984

D
83.7025

However, as regards those whose number of poles is 2 poles and 6 poles, theevaluation shall be made using the value calculated by multiplying the energy
consumption efficiency obtained by measurement by coefficient g in case of 2
poles or coefficient h in case of 6 poles (rounding off the second place after thedecimal point).

Coefficient g ＝

A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D
A’×(log10 (PN/PC))3 + B’×(log10 (PN/PC))2 + C’×log10(PN/PC) + D’

Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A’, B’, C’ and D’: Interpolation coefficientsA'
0.3569Coefficient h ＝B'-3.3076

C'
11.6108D'
82.2503

A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D
A”×(log10 (PN/PC))3 + B”×(log10 (PN/PC))2 + C”×log10 (PN/PC) + D”

Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A”, B”, C” and D”: Interpolation coefficientsA"
0.1252B"-2.6130C"
11.99635D"
80.4769

Note 3. If shipped including 3 ratings (6 ratings), as regards 200 V/60 Hz (400 V/60
Hz), the evaluation shall be made using the value obtained by multiplying
the energy consumption efficiency obtained by measurement by each of thecoefficients i to k listed in Table 4 and rounding off the second place after thedecimal point.
The 3 ratings and 6 ratings are defined as follows.
3 ratings: 200 V/50 Hz, 200 V/60 Hz, 220 V/60 Hz or
400 V/50 Hz, 400 V/60 Hz, 440 V/60 Hz
6 ratings: 200 V/50 Hz, 200 V/60 Hz, 220 V/60 Hz, 400 V/50 Hz, 400 V/60 Hz,
440 V/60 Hz
Table 4 Coefficients of Each Rated Output of 3 Ratings (6 Ratings)
Rated output

2 poles

4 poles

6 poles[kW]

Coefficient i

Coefficient j

Coefficient k

1.1325
1.04851.02981.04681.02291.0362
1.02461.02441.03101.02861.0286
1.0262
1.02271.02151.02581.0192
1.00951.01381.01261.00841.01301.01881.01881.01471.01471.00991.00991.01091.0142
1.01191.01191.01071.01071.01061.0032
1.0032
1.0032
1.0042
1.0042
1.0042

1.0452
1.00230.99081.01701.01701.02461.02461.02211.02881.02071.02071.01071.01501.01281.01711.01171.0117
1.00741.01161.0116

0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

6Note 4. As regards the number of units shipped by each business operator, if theshipment is made including 3 ratings (6 ratings) listed in Note 3, thequantity ratios listed in Table 5 shall be used to calculate the quantity ofeach rating. In the calculation, the first place after the decimal point isrounded off to obtain an integer value and, if it is necessary to adjust
fractional quantity, the adjustment shall be made by the rating whose
quantity ratio is highest.
Table 5 Quantity Ratio of Each Voltage and Frequency of 3 Ratings (6 Ratings)
Rated voltage

200 V

220 V

Rated frequency

50 Hz

Quantity ratio

50%

Rated voltage

400 V
440 V
50 Hz
60 Hz
50%
30%
20%

Rated frequency
Quantity ratio
Rated voltage

200 V

Rated frequency

50 Hz

Quantity ratio

40%

60 Hz
30%

220 V
60 Hz
25%

400 V

440 V

50 Hz
10%

7

20%

10%

60 Hz
5%

10%

(3) Method for measuring energy consumption efficiency [See Attachment 5 andAttachment Sheet 2.]
The energy consumption efficiency of three-phase induction motors shall bemeasured as the ratio (%) of output (value obtained by subtracting total loss (*) from
input) [W] against input [W] by the method specified in JIS C 4034-2-1 (the test
method for “low” uncertainty) and calculated by the following formula.
Performance [%] = (Input [W] – Total loss [W])/Input [W]×100* The total loss is obtained as the sum of fixed loss, load loss (the calculation method
for the load loss by a load test) and stray load loss (the calculation method for thestray load loss by a load test conducting torque measurement).
(4) Items to be indicated, etc.
1) Items to be indicated
The items to be indicated are as follows.
i) Product nameii) Rated output (kW)iii) Number of polesiv) Rated voltage (V)v) Rated frequency or base frequency (Hz)vi) Category of usage (S1 or S2 (Load hour rate; equal to or higher than 80%))vii) Energy consumption efficiency (%: Rated performance at rated voltage andfrequency)viii) Efficiency class (IE code)ix) Name of manufacturer, etc.
2) Matters to be complied with
<1> The energy consumption efficiency [%] shall be expressed by the number down
to the first place after the decimal point.
<2> The efficiency class (IE code) said in viii) of the foregoing paragraph 1) shall be
described for each rated voltage and frequency. However, if the efficiency
class (IE code) at each rated voltage and frequency is common to all, it isacceptable to describe only one type.
<3> The indication of the items listed in the foregoing paragraph 1) shall be madeon a visible place of a three-phase induction motor’s main body in a way thatmakes it difficult to erase the indication. They must also be described in
catalogues indicating the performance of the product or in data provided forusers by manufacturers, etc. when they choose products, on a visible place andin a way that makes it difficult to erase the indication.

8

3. Proposals for energy conservation(1) Actions of Government
1) From viewpoint of promoting three-phase induction motors with excellent energy
consumption efficiency, the government shall endeavor to implement necessary
measures such as diffusion and publication, etc. of those products to promoteactions of users (people who buy single unit of three-phase induction motor or
machines incorporating three-phase induction motors) and manufacturers, etc.
(2) Actions of manufacturers, etc.
1) Manufacturers, etc. shall endeavor to promote the development of energy
conservation technologies for three-phase induction motors to develop andmanufacture or import products with excellent energy consumption efficiency.
2) From viewpoint of diffusing three-phase induction motors with excellent energy
consumption efficiency, manufacturers, etc. shall endeavor to provide appropriate
information for users to encourage them to choose three-phase induction motors
with excellent energy conservation performance by indicating the energy
consumption efficiency and presenting advantages by exchanging with highefficiency products including precaution for use, etc. at visible places of catalogues
or operation manuals of target products as well as of data provided bymanufacturers, etc. to help users choose products.
(3) Actions of manufacturers, etc. of machines incorporating three-phase induction
motors1) Manufacturers, etc. of machines incorporating three-phase induction motors shallendeavor to manufacture or import machines incorporating three-phase induction
motors with excellent energy consumption efficiency.
2) From viewpoint of diffusing machines incorporating three-phase induction motors
with excellent energy consumption efficiency, efforts shall be made to provide
appropriate information for users to encourage them to choose machines
incorporating three-phase induction motors with excellent energy conservation
performance by indicating the energy consumption efficiency at visible places ofcatalogues or operation manuals of target products as well as of data provided bymanufacturers, etc. to help users choose products.
(4) Actions of users
When purchasing “single three-phase induction motor” or “machines incorporating
three-phase induction motors”, users shall endeavor to choose three-phase induction
motors with excellent energy consumption efficiency or machines incorporating such
three-phase induction motors and promote energy conservation by using themappropriately and efficiently.

9Attachment 1

Target Scope of Three-phase Induction Motors
1. Basic idea
The scope to which the standards of this evaluation are applied shall be as follows
as specifically designated from among “standard three-phase induction motors(classification code: 301223)” and “non-standard three-phase induction motors (70 Wor higher) (classification code: 301224)” classified by Japan Standard Commodity
Classification (as revised in June, 1990) based on the scope of three-phase induction
motors (hereinafter referred to as motors) which is specified by Japanese Industrial
Standards JIS C 4034-30 “Rotating electrical machines - Part 30: Efficiency classes ofsingle-speed, three-phase, cage-induction motors (IE code)”.
Three-phase squirrel-cage induction motors which satisfy all of the following
conditions [*1]1) Those whose rated frequency or base frequency ( 1) is 50 Hz±5% or 60 Hz±5% orcompatible with both 50 Hz ±5% and 60 Hz ±5% ( 2)2) Those whose speed is single ( 3)3) Those whose rated voltage is 1,000 V or lower ( 4)4) Those whose rated output is 0.75 kW or higher and 375 kW or lower5) Those whose number of poles is either 2 poles, 4 poles or 6 poles
6) Those whose duty type of use is either (a) or (b) below(a) Those which are continuously operated at a constant load for sufficient time toallow the motor to reach thermal equilibrium (abbreviation: S1)(b) Those which are repeatedly used for the time shorter than the time in which
the motor reaches the thermal equilibrium, making the period of time whenthe motor operates at a constant load and the period of time when it is stopped
one cycle (abbreviation: S3), where rated cyclic duration factor is 80% or
higher7) Those driven by a commercial power supply (capable of continuous operating
direct on-line)
However, the following types are excluded.
(A) Those which are completely integrated into other machines (for example,
pumps, fans, compressors, etc.) and cannot be tested separately from suchmachines(B) Those made solely (5) for inverter driving [*2][*1] Even if special flanges, feet and/or shafts are used, those motors are included in
the scope.
[*2] Those whose base frequency is 50 Hz ±5% or 60 Hz ±5% are included in thescope.
(1) The base frequency is the maximum rated frequency with which a motor can continuously generate the rated
torque.

(2) In case of motors with multiple rated frequencies or base frequencies, those with one or more applicable rated
frequencies or base frequencies(3) Those which cannot change the number of poles(4) In case of motors with multiple rated voltages, those with one or more applicable rated voltages
5( ) Solely for inverter driving means those which cannot be driven by commercial electric power source, etc.

10

2. Motors excluded from the scope
Of target three-phase induction motors, the following motors are excluded from thescope.
As the principle of the exclusion, 1) those which are used for special applications, 2)
those for which technical methods for measurement and evaluation have not been
established and 3) those whose use ratio in the market is extremely low are excluded
from the scope.
(1) Those whose thermal class specified by JIS C 4003 “Electrical insulation - Thermal
evaluation and designation” is 180 (H), 200 (N), 220 (R) or 250
Although those are used in a high temperature condition such as electric furnaces,
they are excluded from the scope because 1) they are used for special applications
and 3) their use ratio in the market is extremely low.
* Number of units shipped (FY2008): 1,304 units (ratio to the total: 0.03%)
Number of units shipped (FY2009): 1,022 units (ratio to the total: 0.06%)
Reference: Excerpt from JIS C 4003 (2010)
5. Thermal class
The temperature of electric products is, in most cases, a main factor causing the deterioration of electricalinsulation materials within electrical insulation systems. Therefore, the basic thermal class is useful and it
has been recognized internationally too. If a thermal class is specified for an electrical insulation system, itmeans the recommended maximum continuous use temperature (°C) in case of appropriate combination ofelectrical insulation materials.
The thermal class of electrical insulation systems is specified based on the result of a functional test
conducted according to use experience or 4.5. The thermal class of this electrical insulation system is
specified based on the actual thermal durability index of the electrical insulation system or the relative
thermal durability index of the electrical insulation system.
Even if a thermal class of an electrical insulation material is applied to an electrical insulation material
based on the result of a test conducted according to use experience or 4.4, it does not mean that it isappropriate to use the thermal class of the electrical insulation material for the thermal class of the electricalinsulation system or it does not automatically mean that the thermal class of the electrical insulation systempart of which is formed by the electrical insulation material is equal to the thermal class of the electricalinsulation material.
Table 1 below shows the designations of thermal classes.
Table 1 - Designations of Thermal Classes
Actual thermal durability index or relative
thermal durability index °C

Thermalclass °C

Specifiedletter a)Notea) If necessary, a specified letter can be expressed using a bracket, like class 180 (H). If thespace for the indication is small, like name plates, only a specified letter can be used forindividual product standards.
b) The thermal class exceeding 250 increases by the unit of 25 and is specified accordingly.

11(2) Those of delta-star starting system (65)Those motors are used for weaving machines which require excessive torque whenstarting, but they are excluded from the scope because 1) they are used for special
applications and 3) their use ratio in the market is extremely low.
* Number of units shipped (FY2008): 2,518 units (ratio to the total: 0.06%)
Number of units shipped (FY2009): 1,910 units (ratio to the total: 0.11%)(3) Those designed for vessels or ocean structures (floating facilities for production,
storage or loading of oil, oil platforms, etc.)
Those motors are used as auxiliary driving power motors for pumps, airconditioning fans, cargo handling cranes, etc. used on vessels, but excluded from thescope because they are specially structured considering vibration, salt resistance,
humidity resistance, etc. and 3) their use ratio in the market is extremely low.
* Number of units shipped (FY2008): 17,000 units (ratio to the total: 0.38%)
Number of units shipped (FY2009): 13,584 units (ratio to the total: 0.81%)(4) Those which are structured for the use in liquid
Those motors are used for submerged pumps, disaster preventive pumps, dust
collectors used for sewage treatment plants, etc., but excluded from the scope because
1) they are used for special applications, 2) technical methods for measurement andevaluation have not been established and 3) their use ratio in the market is extremely
low.
* Number of units shipped (FY2008): 45,264 units (ratio to the total: 1.02%)
Number of units shipped (FY2009): 44,355 units (ratio to the total: 2.64%)(5) Those which are explosion-proof types
Those motors are used in explosive atmosphere of oil refinery plants, etc., but
excluded from the scope because 1) they are used for special applications and 3) theiruse ratio in the market is extremely low.
* Number of units shipped (FY2008): 33,855 units (ratio to the total: 0.76%)
Number of units shipped (FY2009): 26,558 units (ratio to the total: 1.58%)

6 To weave fabric evenly, it is necessary to start weaving machines momentarily at predetermined revolution speed.

Therefore, motors designed for delta starting transitioning to star operation are used to make the starting torque
1000% or greater of that at the time of rating operation, as opposed to the star-delta starting system designed forthe purpose of suppressing the starting current.

12(6) Those whose ratio of difference between the synchronous speed and the rotational
speed of the rotor is either (a) or (b) of the following conditions(a) Those whose output is 0.75 kW or higher and 110 kW or lower: 5% or above(b) Those whose output is above 110 kW and 375 kW or lower: 3% or above
Those motors are used for crushers, etc. which need great torque, but excluded fromthe scope because 1) they are used for special applications and 3) their use ratio in themarket is extremely low.
* Number of units shipped (FY2008): 5,818 units (ratio to the total: 0.13%)
Number of units shipped (FY2009): 3,020 units (ratio to the total: 0.18%)(7) Those designed for the use in dams or dam’s gates
Those motors are used as motors for dams or for the opening and closing of dam’s
gates, but excluded from the scope because 1) they are used for special applications
and 3) their use ratio in the market is extremely low.
* Number of units shipped (FY2008): 160 units (ratio to the total: 0.004%)
Number of units shipped (FY2009): 137 units (ratio to the total: 0.01%)(8) Those covering stators and rotors with metal materials (Canned motors)
Those motors are used for vacuum pumps, etc. which require high air tightness, but
excluded from the scope because 1) they are used for special applications and (3) theiruse ratio in the market is extremely low.
* Number of units shipped (FY2008): 22 units (ratio to the total: 0.0005%)
Number of units shipped (FY2009): 25 units (ratio to the total: 0.001%)(9) Those used in extremely low temperature environments
Those motors used in extremely low temperature environments whose ambient
temperature is lower than –20°C are specially structured, for example attaching
space heaters, etc., because the performance of bearing grease and insulationmaterial deteriorates in such environments.
Those motors are excluded from the scope because 1) they are used for special
applications and 2) and technical methods for measurement and evaluation have notbeen established.
(10) Motors made solely for inverter driving, those of external fan cooling types
Those motors are used for the load whose torque characteristics are constant suchas conveyors, lifts. They drive cooling fans with different power supplies because,
when operating at a low speed, if the motor outputs the same torque as that of therating operation, the air volume from the motor’s cooling fan decreases and overheats
the motor.

13

Those motors are excluded from the scope because 2) technical methods formeasurement and evaluation have not been established and 3) their use ratio in themarket is extremely low.
* Number of units shipped (FY2008): 25,611 units (ratio to the total: 0.58%)
Number of units shipped (FY2009): 20,528 units (ratio to the total: 1.22%)
If above (1) to (10) are totaled, the number of those products shipped accounts forapproximately 3.0% (FY2008) and approximately 6.6% (FY2009) of the total.
* The number of units shipped was quoted from the voluntary statistics of theJapan Electrical Manufacturers’ Association
Meanwhile, in light of the intention of the law established for the purpose of
securing effective use of fuel resources in the country, even if three-phase induction
motors are shipped in the country (three-phase induction motors shipped overseas are
excluded), if they are incorporated into other machines and those machines areexported overseas, they are excluded from the scope (those which indicate overseas
voltage/frequency on name plates, etc. and those for which the fact that they areshipped overseas can be confirmed with their order sheets, overseas recognition
marks, etc.).

14

Attachment 2

Target Fiscal Year, etc. of Three-phase Induction Motors
1. Target fiscal year
It is reasonable to make FY2015 the target fiscal year as it puts 5 years after thereference fiscal year 2010, considering the period needed for the development ofelementary technologies, the period needed for the development of products, state ofdiffusion of products since then.
Meanwhile, unified performance classes (IE1: standard, IE2: high performance,
IE3: premium performance) of three-phase induction motors have been specified by
IEC (International Electrotechnical Commission), and based on this classification,
regulations are being introduced in each country and three-phase induction motors
are being traded in the worldwide market. As the regulation for three-phaseinduction motors is to be upgraded to IE3 in FY2015 in Europe, it is anticipated thatthe trend toward making high-performance three-phase induction motors isdrastically accelerated in FY2015. From this viewpoint too, it is reasonable to make
FY2015 the target fiscal year because it accords with the time when change is
expected in Europe and Japanese manufacturers can change products and invest in
equipment while maintaining their competitiveness not only in the country also inoverseas markets.
2. Improvement in the target fiscal year
The improvement ratio of the energy consumption efficiency [%] in the target fiscal
year is estimated to be 7.4% against the current target standard value based on thepremise that the number of units shipped and the product composition of eachcategory of FY2010 remain unchanged.
<Outline of estimation>(1) The energy consumption efficiency per unit [%] calculated based on thethree-phase induction motors actually shipped in the reference fiscal year
(FY2010) making weighted averages with the number of units shipped:
Approximately 81.1 [%/unit](2) The energy consumption efficiency per unit [%] calculated based on the target
standard values of three-phase induction motors expected to be shipped in thetarget fiscal year (FY2015) making weighted averages with the number of units
shipped:Approximately 87.1 [%/unit](3) Improvement ratio of energy consumption efficiency:
87.1 [%/unit] – 81.1 [%/unit]
81.1 [%/unit]

×100 = Approximately 7.4 [%]15

Attachment 3

Categories for Setting Targets for Three-phase Induction Motors
1. Basic idea
Three-phase induction motors shall be classified based on the principles referred toas “the basic idea concerning the development and revision of evaluation standards
for manufacturers, etc. to be considered in relation to the improvement in
performance of specific equipment” (the 10th Energy Efficiency Standards
Subcommittee of the Advisory Committee for Natural Resources and Energy, revisedon June 18, 2007) (hereinafter referred to as “the principles”).
“The basic idea concerning the development and revision of evaluation standards
for manufacturers, etc. to be considered in relation to the improvement in
performance of specific equipment”- Extract –Principle 2: Specific equipment is classified based on certain indices. The indices(basic indices) are those which are deeply related to energy consumption
efficiency such as physical amount and functions, and they are
determined considering coefficients which consumers use as criteria
when choosing products (coefficients representing consumers’ needs).
Principle 3: Target standard values are determined by one value or functional
formula for each category for which it is possible and appropriate totarget at the same energy consumption efficiency.
Principle 4: When setting categories, additional functions are disregarded inprinciple. However, there may be a case in which, if the energy
consumption efficiency of a product without an additional function is set
as a target standard value, other products with the additional function
may have to withdraw from the market because they cannot comply withthe target standard value, despite the fact that the needs for the latterproducts are thought to be high in the market. If the probability of suchcase is high, then it is acceptable to make another category (sheet) for
those products.
Principle 5: As regards products which are expensive but excellent in the energy
consumption efficiency because of using advanced energy saving
technologies, although it is possible to classify them into a separate
category, it is desirable to treat them in the same category with others
wherever possible so that manufacturers can actively sell the productswith excellent energy consumption efficiency.
Principle 6: When setting a target standard value for a category, special products
shall be excluded. However, availability of technologies employed insuch special products shall be also reviewed when studying the future
performance improvement possibly realized by technology development,
etc.

16

2. Specific classification method
Considering the fact that the characteristics of three-phase induction motors
become different according to the frequency and the rated output and it affects theirenergy consumption efficiency [%], the motors are classified as follows.
(1) Classification by frequency■Distribution of frequency by area
Japanese frequency is divided into
Tohoku Electric Power
50 Hz in eastern Japan and 60 Hz in
Hokkaido
ElectricPowerwestern Japan.
As three-phaseinduction motors rotate at a speed
Hokuriku ElectricPowerproportional to the frequency, therevolution speed (the number of
Chugoku ElectricPowerrevolution per minute) of three-phaseinduction motors used in 50 Hz areas
Chubu Electricand that of three-phase induction
Powermotors used in 60 Hz areas are
Shikoku Electric Kansai Electric PowerPowerTokyo Electricdifferent.
Power
Also, when a motor is revolving n Okinawa ElectricPower 60 Hz
Kyushu Electric Powertimes per second at torque [Nm], theArea where both 50 Hz and 60 Hz exist.
output P [W] is calculated as
P [W] = 2･π･n･T, so, for example, if it is tried to generate the same output withmotors with different number of revolution n, the torque becomes different too. (SeeTable 1.)
Based on this fact, the classification is made by frequency.
Table 1 Example of 37 kW Three-phase Induction Motor with 4 Poles

Power supply frequency [Hz]Number of synchronous
Speed [min–1]
revolution
Torque [Nm]Rated torque

50

60

1500

1800

242

201

(2) Classification by rated output
Three-phase induction motors are systems which convert electric energy tomechanical energy, so the rated output [kW] of three-phase induction motors as anindex of the energy necessary for driving machines is a basic index for users choosing
three-phase induction motors.
As three-phase induction motors are used by being incorporated into othermachines such as pumps, fans, compressors, it is necessary to make their bodies
compatible with current models. As a result, there are limits to the use of materials
and the content of improvement such as cooling, and there are also limits to theimprovement of performance depending on each output.
Based on those facts, the classification is made according to the rated output.
17

3. Summary of classifications
Based on the ideas stated in paragraphs 1 and 2 above, the categories for setting
the target are made as per Table 2 below.
Table 2 Categories of Three-phase Induction Motors
Category

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

Frequency (Rated frequency orbase frequency)

Rated output
0.75 kW or higher, lower than 0.925 kW
0.925 kW or higher, lower than 1.85 kW
1.85 kW or higher, lower than 4.6 kW
4.6 kW or higher, lower than 9.25 kW
9.25 kW or higher, lower than 13 kW
13 kW or higher, lower than 16.75 kW

60 Hz

16.75 kW or higher, lower than 26 kW
26 kW or higher, lower than 33.5 kW
33.5 kW or higher, lower than 41 kW
41 kW or higher, lower than 50 kW
50 kW or higher, lower than 100 kW
100 kW or higher, lower than 130 kW
130 kW or higher, 375 kW or lower

0.75 kW
1.1 kW
1.5 kW
2.2 kW
3 kW
4 kW
5.5 kW
7.5 kW
11 kW
15 kW
18.5 kW
22 kW
30 kW
37 kW
45 kW
55 kW
75 kW
90 kW
110 kW

50 Hz

18

33
34
35
36

132 kW
160 kW
200 to 375 kW
Others

50 Hz

19

4. Supplement to classifications
The method of classifying three-phase induction motors by their frequency andrated output accords with IEC or JIS. (* IEC or JIS further classifies them by the
number of poles. The reason that the classification of this document did not do so is
clarified in paragraph 4 of Attachment 4.)
Both IEC and JIS make the classification according to each rated output, and theperformance value of rated output other than that specified by IEC or JIS isaddressed differently according to the frequency, i.e. either 60 Hz or 50 Hz, as
described below.
Specifically, in case of 60 Hz, an performance value of rated output other than thatspecified by IEC or JIS is determined by its position, i.e. whether it is equal to or
higher than the middle point between rated output in front of it and rated output
behind it or lower than the middle point, and the performance value up to the middle
point between one rated output and the next rated output is supposed to be constant.
* For example, if rated output other than specified one is between 0.75 kW and 1.1
kW, the performance value is supposed to be constant between the point equal toor higher than 0.75 kW and the point lower than 0.925 kW (the middle point
between 0.75 kW and 1.1 kW).
Meanwhile, in case of 50 Hz, the performance value of rated output other than thatspecified by IEC or JIS is primarily determined by putting a value in a formula, whichbecomes different according to output.
Considering the nature mentioned above, the classification of 60 Hz is made bygiving margin to the rated output, that of 50 Hz is made for each class of rated output
and a new classification is made for others which do not belong to the foregoingclassifications.
[Reference JIS C 4034-30: 2011]
60 Hz 5.4.1.2 (Excerpt)
The nominal performance value of 60 Hz rated output other than specified one isdetermined as follows.
- Between two continuous output ratings, the nominal performance of the rated
output which is equal to or higher than the middle point shall be the higher one oftwo classes of nominal performance.
- Between two continuous output ratings, the nominal performance of the rated
output which is lower than the middle point shall be the lower one of two classesof nominal performance.
Image of 60 Hz

Performance
効率
[%]
［％］

Middle
中間点
point

y’

y

=

=

20

Rated
定格出力
output
[kW]
［kW］

Rated
Rated
定格出力x’
定格出力xx＋x’
output x
output x’
２2) Lowerthan1)①中間点以上
Equal to or higher②中間点未満middle point
than middle point[Reference JIS C 4034-30: 2011]
50 Hz 5.4.1.1 (Excerpt)
The nominal performance value of rated output (PN) other than specified one iscalculated using formula (1).
η (performance) = A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D... (1)Where, A, B, C and D: Interpolation coefficient Pc [kW]: 1 [kW]IE code

IE3

Interpolation
coefficient

2 poles

4 poles

6 polesA

0.35690.07730.1252B–3.3076–1.8951–2.6130

C

11.6108

9.298411.9963D

82.250383.702580.4769

21

Attachment 4

Target Standard Values for Three-phase Induction Motors

1. Basic idea
Target standard values are set based on the idea of Top Runner method. The
specific ideas are as follows.
1) Target standard values shall be set for every category that has been defined
appropriately.
2) As for categories where technological advances in the future are expected to
improve the performance of products, target standard values shall allow for
improvement as much as possible.
3) Target standard values shall not conflict with each other among categories.
2. Specific technologies for improving energy consumption efficiency
To improve the performance of three-phase induction motors, it is important to
reduce the loss occurring when converting electric energy to mechanical energy.
The loss is classified mainly into fixed loss (iron loss and machine loss), load loss
(primary copper loss and secondary copper loss) and stray load loss and they areclosely related to each other, so it is necessary to reduce each type of loss with a goodbalance. There are specific examples of the reduction as follows.
(a) Improvement of material for magnetic steel sheet
The magnetic steel sheet constituting the iron core shall be changed to the typewith less iron loss [W/kg].
(b) Improvement of stator side and rotor side
Although it is possible to reduce the iron loss with the improvement (a), thismethod conversely lowers the magnetic flux density, reduces the magnetic flux inthe motor, increases the current for compensating for the reduction of themagnetic flux and increases copper loss or stray load loss, so it is also necessary to
improve the stator side and the rotor side.
Stator iron 筐体
core
固定子鉄心
Stator
固定子
固定子

回転子 core
Rotor iron
回転子鉄心

Rotor
回転子

Figure 1: Structural Drawing of Three-phase Induction Motor

22

Examples of improvement of stator side
- Increase of conductor’s cross-section area: Change of the iron core shape so that it
can contain more conductors (coils)- Shortening of winding edge length: Reduction of resistance by making the winding
length shorter- Improvement of winding’s occupancy ratio: Increase of coil volume in the iron core
slot
Stator iron core

固定子鉄心

固定子コア

固定子コア

絶縁紙

Iron
core
鉄心
slot

スロット

絶縁ワイヤコア

Conductor
導体(Coil)

Winding
巻線

絶縁ワイヤコア（コイル）

Figure 2: Structural Drawing of Stator
Examples of improvement of rotor side
- Increase of conductor’s cross-section area: Change of iron core shape so that it canincrease the occupancy ratio of the conductor (the cage portion), increase of thealuminum filling ratio of the cage portion- Insulation and thermal treatment of rotor’s grooves: Enhancement of insulation
between the conductor and the iron core
Rotor iron core
回転子鉄心Conductor (Cage portion):
導体（かご部）：
Copper (or aluminum)

銅（またはアルミ）

Figure 3: Structural Drawing of Rotor
3. Specific target standard values
According to the category of three-phase induction motors, Top Runner values wereobtained from actually measured values of the energy consumption efficiency [%] ofeach class of the rated output in FY2010 as a reference year to study the target
standard values.

23

The majority of three-phase induction motors in the country are currently IE1 andhigh-performance types are few. (Reference 1: Current State of Three-phase Induction
Motors (the first committee explanation data))
IE1 to IE3 and Top Runner values are shown in Figure 4 to Figure 9 below. If
these results are summarized based on the characteristics of 4 poles using the ratiosof the performance values of IE1, IE2 and IE3 (converting 2 poles to 4 poles andconverting 6 poles to 4 poles), Figure 4 to Figure 6 are consolidated into Figure 10 and
Figure 7 to Figure 9 are consolidated into Figure 11.
Based on the results above and the technical improvements stated in paragraph 2
above, the highest performance classes (IE3) among the regulations implemented byeach country for its three-phase induction motors were set as the target standard
values (as per Table 1. As regards Note 1 to Note 4, details are stated in paragraph 4).
As a result, improvement 0.6% over the Top Runner value (6.2% over IE1) is
expected for 60 Hz and improvement 0.8% over the Top Runner value (8.8% over IE1)
is expected for 50 Hz.

24

[%]
96.0

60 Hz, 2 poles

94.0
92.0
90.0

IE3
IE2

88.0

IE1
86.0

Top
トップ値
value

84.0
82.0
80.0
0

50

100

150

200

250

300

350

400

[kW]

Figure 4: Energy Consumption Efficiency at Rated Output of 60 Hz (2 Poles)
[%]
96.0

60 Hz, 4 poles

94.0
92.0
90.0

IE3
IE2

88.0

IE1
86.0

Top
トップ値
value

84.0
82.0
80.0
0

50

100

150

200

250

300

350

400

[kW]

Figure 5: Energy Consumption Efficiency at Rated Output of 60 Hz (4 Poles)
25

[%]
96.0

60 Hz, 6 poles

94.0
92.0
90.0

IE3
IE2

88.0

IE1
86.0

Top
トップ値
value

84.0
82.0
80.0
0

50

100

150

200

250

300

350

400

[kW]

Figure 6: Energy Consumption Efficiency at Rated Output of 60 Hz (6 Poles)
[%]
96.0

50 Hz, 2 poles

94.0
92.0
90.0

IE3
IE2

88.0

IE1
86.0

トップ値

84.0
82.0
80.0
0

50

100

150

200

250

26

300

350

400

Figure 7: Energy Consumption Efficiency at Rated Output of 50 Hz (2 Poles)
[%]
96.0

50 Hz, 4 poles

94.0
92.0
90.0

IE3
IE2

88.0

Top
IE1

value
Top
トップ値
value

86.0
84.0
82.0
80.0
0

50

100

150

200

250

300

350

400

[kW]
[kW]

Figure 8: Energy Consumption Efficiency at Rated Output of 50 Hz (4 Poles)
[%]
96.0

50 Hz, 6 poles

94.0
92.0
90.0

IE3
IE2

88.0

IE1

Top
トップ値
value

86.0
84.0
82.0
80.0
0

50

100

150

200

250

27

300

350

400

[kW]

Figure 9: Energy Consumption Efficiency at Rated Output of 50 Hz (6 Poles)
Performancevalue by（60Hz）
output (60 Hz)
出力別効率値
100

98

Performancevalue (%)
効率値（％）

96

94

92

60 Hz,
IE3
60Hz
4極4 poles,
IE3
Top value actually
実測トップ値90

measured

60Hz
4極4 poles,
IE1
60 Hz,IE1
Top value actually measured
実測トップ値（係数処理2極)(Coefficient treatment 2 poles)

88

Top value actually measured
実測トップ値（係数処理6極）(Coefficient treatment 6 poles)

86

84

82

80
0

50

100

150

200

250

出力（ｋＷ）
Output (kW)

300

350

400

Figure 10: Energy Consumption Efficiency at Rated Output of 60 Hz

Performancevalue by（50Hz）
output (50 Hz)
出力別効率値
100

98

Performancevalue (%)
効率値（％）

96

94

92

50Hz
IE3 IE350
Hz,4極
4 poles,Topvalue actually
実測トップ値
measured50
Hz,4極
4 poles,50Hz
IE1 IE1

90

Top value actually measured
実測トップ値（係数処理2極）(Coefficient
treatment 2 poles)
Top value actually measured
実測トップ値(係数処理6極）(Coefficient treatment 6 poles)

88

86

84

82

80
0

50

100

150

200

250

出力（ｋＷ）
Output (kW)

300

350

400

Figure 11: Energy Consumption Efficiency at Rated Output of 50 Hz

28

Table 1 Standard Energy Consumption Efficiency of Three-phase Induction Motors

10.75 kW or higher, lower than 0.925 kW

Targetstandard
value [%]
85.5

2

0.925 kW or higher, lower than 1.85 kW

86.5

3

1.85 kW or higher, lower than 4.6 kW

89.5

4

4.6 kW or higher, lower than 9.25 kW

91.7

5

9.25 kW or higher, lower than 13 kW

92.4

6

13 kW or higher, lower than 16.75 kW

93.0

16.75 kW or higher, lower than 26 kW

93.6

8

26 kW or higher, lower than 33.5 kW

94.1

9

33.5 kW or higher, lower than 41 kW

94.5

10

41 kW or higher, lower than 50 kW

95.0

11

50 kW or higher, lower than 100 kW

95.4

12

100 kW or higher, lower than 130 kW

95.8

13

130 kW or higher, 375 kW or lower

96.2

14

0.75 kW

82.5

15

1.1 kW

84.1

16

1.5 kW85.3

17

2.2 kW

86.7

18

3 kW

87.7

19

4 kW

88.6

20

5.5 kW

89.6

21

7.5 kW

90.4

22

11 kW

91.4

15 kW

92.1

18.5 kW

92.6

25

22 kW

93.0

26

30 kW

93.6

27

37 kW

93.9

28

45 kW

94.2

29

55 kW

94.6

30

75 kW

95.0

31

90 kW

95.2

32

110 kW

95.4

33

132 kW

95.6

Category

7

23
24

Rated frequency orbase frequency

60 Hz

Rated output

50 Hz

29

34
35

50 Hz

36

30

160 kW

95.8

200 to 375 kW

96.0

Others

Note 2

Note 1. The evaluation is made using the values obtained by multiplying the energy
consumption efficiency obtained by measurement by the coefficients a to flisted in Table 2 and Table 3, then rounding off the second place after thedecimal point of those values thus obtained.
In case of output other than rated output listed in Table 2 (60 Hz), if theoutput in question is equal to or higher than the middle point between two of
the rated output which are one class higher and lower than the output inquestion, the coefficients a to c of the higher rated output are used, and if theoutput in question is lower than said middle point, the coefficients a to c of
the lower rated output are used.
Table 2 Coefficients of Each Output of 60 Hz

Table 3 Coefficients of Each Output of 50 Hz

Rated output

2 poles

4 poles

6 poles

Rated output

2 poles

4 poles

6 poles[kW]

Coefficient a

Coefficient b

Coefficient c[kW]1.11041.02981.01171.03471.01131.02461.01661.01541.02201.02071.02071.01841.01611.01501.0192
1.01381.0042
1.00841.00841.00421.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.03640.9886
0.97741.00001.00001.0077
1.0077
1.00761.0142
1.00651.00651.00001.00431.00531.00951.0042
1.00421.00001.0042
1.0042

Coefficient d

Coefficient e

Coefficient f

1.02231.01691.01311.0093
1.00691.00571.00451.00331.0022
1.0022
1.0022
1.0032
1.0032
1.00211.00211.0032
1.0032
1.00211.00211.00211.00211.00211.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.00001.04561.0383
1.03391.02851.02451.02071.0182
1.01461.0122
1.00991.00981.0087
1.00751.00641.00531.00531.0042
1.0032
1.0032
1.00211.00211.0021

0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

0.75
1.1
1.5
2.2
3
4
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
132
160
200 to 375

31Note 2. The target standard value (η: %) of category 36 listed in Table 1 shall be thevalue calculated by the following formula.

η = A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D
Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A, B, C and D: Interpolation coefficientsA
B
C
D
0.0773-1.89519.298483.7025

However, as regards those whose number of poles is 2 poles and 6 poles, theevaluation shall be made using the value calculated by multiplying the energy
consumption efficiency obtained by measurement by coefficient g in case of 2
poles or coefficient h in case of 6 poles (rounding off the second place after thedecimal point).

Coefficient g =A x (log10 (PN/PC))3 + B x (log10 (PN/PC))2 + C x log10 (PN/PC) + D
A’ x (log10 (PN/PC))3 + B’ x (log10 (PN/PC))2 + C’ x log10 (PN/PC) + D’

Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A’, B’, C’ and D’: Interpolation coefficientsA'
0.3569Coefficient h =B'-3.3076

C'
11.6108D'
82.2503A x (log10 (PN/PC))3 + B x (log10 (PN/PC))2 + C x log10 (PN/PC) + D
A” x (log10 (PN/PC))3 + B” x (log10(PN/PC))2 + C” x log10 (PN/PC) + D”

Where, PN [kW]: Rated output
PC [kW]: 1 [kW] (for making PN non dimensional)
A”, B”, C” and D”: Interpolation coefficientsA"
0.1252B"-2.6130C"
11.9963

32

D"
80.4769

Note 3. If shipped including 3 ratings (6 ratings), as regards 200 V/60 Hz (400 V/60
Hz), the evaluation shall be made using the value obtained by multiplying
the energy consumption efficiency obtained by measurement by each of thecoefficient i to k listed in Table 4 and rounding off the second place after thedecimal point.
The 3 ratings and 6 ratings are defined as follows.
3 ratings: 200 V/50 Hz, 200 V/60 Hz, 220 V/60 Hz or
400 V/50 Hz, 400 V/60 Hz, 440 V/60 Hz
6 ratings: 200 V/50 Hz, 200 V/60 Hz, 220 V/60 Hz, 400 V/50 Hz, 400 V/60 Hz,
440 V/60 Hz
Table 4 Coefficient of Each Rated Output of 3 Ratings (6 Ratings)
Rated output

2 poles

4 poles

6 poles[kW]

Coefficient i

Coefficient j

Coefficient k

1.1325
1.04851.02981.04681.02291.0362
1.02461.02441.03101.02861.0286
1.0262
1.02271.02151.02581.0192
1.00951.01381.01261.00841.01301.01881.01881.01471.01471.00991.00991.01091.0142
1.01191.01191.01071.01071.01061.0032
1.0032
1.0032
1.0042
1.0042
1.0042

1.0452
1.00230.99081.01701.01701.02461.02461.02211.02881.02071.02071.01071.01501.01281.01711.01171.0117
1.00741.01161.0116

0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

33Note 4. As regards the number of units shipped by each business operator, if theshipment is made including 3 ratings (6 ratings) listed in Note 3, thequantity ratios listed in Table 5 shall be used to calculate the quantity ofeach rating. In the calculation, the first place after the decimal point isrounded off to obtain an integer value and, if it is necessary to adjust
fractional quantity, the adjustment shall be made with the rating whose
quantity ratio is highest.
Table 5 Quantity Ratio of Each Voltage and Frequency of 3 Ratings (6 Ratings)
Rated voltage

200 V

Rated frequency

50 Hz

Quantity ratio

50%

Rated voltage
50 Hz

Quantity ratio

50%

200 V

Rated frequency

50 Hz

Quantity ratio

40%

60 Hz
30%

20%

400 V

Rated frequency

Rated voltage

220 V

440 V
60 Hz
30%

220 V
60 Hz
25%

400 V

440 V

50 Hz
10%

34

20%

10%

60 Hz
5%

10%

4. Correction coefficients related to the setting of target standard values(1) Correction coefficients based on the number of poles (Idea of Note 1 of Table 1)
The number of poles of the target three-phase induction motors is 2 poles, 4 poles
and 6 poles but, as Table 6 shows, of approximately 100 million motors so far diffusedin the country, those with 4 poles account for approximately 65%.
When setting a target standard value for each category, it is desirable to widen thescope of each category as much as possible in light of promoting energy conservation
to the maximum, so, using 4 poles as the base (making the correction coefficient 1),
and by setting a correction coefficient for each energy consumption efficiency of 2
poles and 6 poles, 2 poles, 4 poles and 6 poles are evaluated in the same category.
The correction coefficients are calculated as shown in Table 7 and Table 8 using theperformance ratio of IE3 specified by the international standard IEC 60034-30 andJapanese Industrial Standards JIS C 4034-30.
Table 6 Quantity and Ratio of 2 Poles, 4 Poles and 6 Poles Diffused in the Country
Quantity [Units]

2 poles

4 poles

6 poles

27,981,200

62,294,954

5,998,316

96,274,470

29.1

64.7

6.2

100

Ratio [%]

Total

* Source: Excerpted from survey report on energy consumption equipment(Business commissioned by Agency for Natural Resources and Energy in 2010)
Table 7 Calculation Basis of Coefficient for Each Rated Output of 60 Hz
Rated output
[kW]
0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

2 poles
[%]
77.0
84.0
85.5
86.5
88.5
89.5
90.2
91.0
91.0
91.7
91.7
92.4
93.0
93.6
93.6
94.1
95.0
95.0
95.4
95.8

[60 Hz] IE3 performance value and ratio
4 poles/2 poles 4 poles 4 poles/6 poles(coefficient a)[%](coefficient c)
1.110485.5
1.03641.029886.5
0.98861.011786.5
0.97741.034789.5
1.00001.011389.5
1.00001.024691.7
1.00771.016691.7
1.00771.015492.4
1.00761.022093.0
1.0142
1.020793.6
1.00651.020793.6
1.00651.018494.1
1.00001.016194.5
1.00431.015095.0
1.00531.019295.4
1.00951.013895.4
1.0042
1.004295.4
1.0042
1.008495.8
1.00001.008496.2
1.0042
1.004296.2
1.004235

6 poles
[%]
82.5
87.5
88.5
89.5
89.5
91.0
91.0
91.7
91.7
93.0
93.0
94.1
94.1
94.5
94.5
95.0
95.0
95.8
95.8
95.8

Table 8 Calculation Basis of Coefficient for Each Rated Output of 50 Hz
Rated output
[kW]
0.75
1.1
1.5
2.2
3
4
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
132
160
200 to 375

2 poles
[%]
80.7
82.7
84.2
85.9
87.1
88.1
89.2
90.1
91.2
91.9
92.4
92.7
93.3
93.7
94.0
94.3
94.7
95.0
95.2
95.4
95.6
95.8

[50 Hz] IE3 performance value and ratio
4 poles/2 poles
4 poles
4 poles/6 poles(coefficient d)[%](coefficient f)
1.022382.5
1.04561.016984.1
1.03831.013185.3
1.03391.009386.7
1.02851.006987.7
1.02451.005788.6
1.02071.004589.6
1.0182
1.003390.4
1.01461.002291.4
1.0122
1.002292.1
1.00991.002292.6
1.00981.003293.0
1.00871.003293.6
1.00751.002193.9
1.00641.002194.2
1.00531.003294.6
1.00531.003295.0
1.0042
1.002195.2
1.0032
1.002195.4
1.0032
1.002195.6
1.00211.002195.8
1.00211.002196.0
1.00216 poles
[%]
78.9
81.0
82.5
84.3
85.6
86.8
88.0
89.1
90.3
91.2
91.7
92.2
92.9
93.3
93.7
94.1
94.6
94.9
95.1
95.4
95.6
95.8

<Image>[60 Hz] Classification【６０Ｈｚ】同区分[50 Hz] Classification【５０Ｈｚ】同区分[6
poles]【６極】
Performancex
実際に測定してvalue actually ×係数c
Coefficient c
得られた効率値
measuredTarget standard
目標基準値
value

[4
poles]【４極】
Performancex
実際に測定してvalue actually ×係数e
Coefficient e
得られた効率値
measured= 1.0000
1.0000＝[2poles]【２極】
Performancex
実際に測定してvalue actually ×係数dCoefficient d
得られた効率値
measured[4
poles]【４極】
Performancex
実際に測定してvalue actually ×係数b
Coefficient b
得られた効率値
measured= 1.0000
1.0000＝[2poles]【２極】
Performancex
実際に測定してCoefficient avalue actually ×係数a
得られた効率値
measuredTarget standard
目標基準値
value

36

[6
poles]【６極】
Performancex
実際に測定してvalue actually ×係数f
Coefficient f
得られた効率値
measured(2) Idea of Category 36 (Idea of Note 2 of Table 1)
The performance value [%] of rated output other than the representative output
shall be calculated by the method specified by the international standard IEC
60034-30 and Japanese Industrial Standards JIS C 4034-30.
[Reference JIS C 4034-30: 2011]
50 Hz 5.4.1.1 (Excerpt)
The nominal performance value of rated output other (PN) than specified one iscalculated using formula (1).
η (Performance) = A×(log10 (PN/PC))3 + B×(log10 (PN/PC))2 + C×log10 (PN/PC) + D ... (1)Where, A, B, C and D: Interpolation coefficient Pc [kW]: 1 [kW]Interpolation
IE code2 poles
4 polescoefficientA
0.35690.0773IE3

6 poles
0.1252B–3.3076–1.8951–2.6130

C

11.6108

9.298411.9963D

82.250383.702580.4769

The “target standard value α” is calculated by putting the rated output value andthe interpolation coefficients (A to D) of 4 poles into the formula described in theframe above (hereinafter called “Formula 1”).
Here, if the number of poles is 4 poles, the evaluation is made between “target
standard value α” and the “performance value actually measured”, and, if the numberof poles is 2 poles and 6 poles, the evaluation is made between “target standard value
α” and the “value calculated by multiplying the performance value actually measured
by the correction coefficient”. Each correction coefficient (g and h) is as follows.
Value obtained by putting the rated output and the interpolation coefficients
2 poles(A to D) of 4 poles into Formula (1)Coefficient g =Value obtained by putting the rated output and the interpolation coefficients(A to D) of 2 poles into Formula (1)Value obtained by putting the rated output and the interpolation coefficients
6 poles(A to D) of 4 poles into Formula (1)Coefficient h =<Image>Value obtained by putting the rated output and the interpolation coefficients(A to D) of 6 poles into Formula (1)[50 Hz] Classification【５０Ｈｚ】同区分

Target standard
目標基準値：αvalue α[2poles]【２極】
x
Performancevalue ×係数g
実際に測定してCoefficient g
actually measured
得られた効率値[4
poles]【４極】
Performance
value
実際に測定して
actually measured

得られた効率値

37[6poles]【６極】
x
Performancevalue ×係数h
実際に測定してCoefficient h
actually measured
得られた効率値

(3) About correction coefficients by 3 ratings (6 ratings) (Idea of Note 3 of Table 1)
Since Japanese frequency is divided into 50 Hz in eastern Japan and 60 Hz inwestern Japan, motors and machines incorporating motors are manufactured as
products compatible with both 200 (400) V/50 Hz and 200 (400) V/60 Hz. However,as the performances of torque of 200 (400) V/60 Hz is inferior to that of 200 (400) V/50
Hz and it is difficult for 200 (400) V/60 Hz to have the same performance as that of
200 (400) V/50 Hz, three-phase induction motors with 3 ratings (200 V/50 Hz, 200
V/60 Hz, and 220 V/60 Hz or 400 V/50 Hz, 400 V/60 Hz and 440 V/60 Hz) adding 220(440) V/60 Hz which realizes the performance closer to that of 200 (400) V/50 Hz or 6
ratings (200 V/50 Hz, 200 V/60 Hz, 220 V/60 Hz, 400 V/50 Hz, 400 V/60 Hz and 440
V/60 Hz) have been introduced.
Here, if the same performance value as that of 220 V/60 Hz (440 V/60 Hz) is soughtfrom 200 V/60 Hz (400 V/60 Hz), the voltage drops, increasing the loss, and it becomes
necessary to take measures such as making the body bigger in order to satisfy aequivalent performance value, which seriously affects the market.
Therefore, as regards the performance value of 200 V/60 Hz (400 V/60 Hz) of
three-phase induction motors shipped including 3 ratings (6 ratings), the evaluation
shall be made between the “values obtained by multiplying the performance values
actually measured by the correction coefficients listed in Table 4 of Note 3 above” andthe “target standard values” of Table 1.
To set specific correction coefficients i, j and k (Table 4 of Note 3), firstly, the ratios(value obtained by dividing the energy consumption efficiency of 200 V/60 Hz by thatof 220 V/60 Hz) of 220 V/60 Hz and 200 V/60 Hz of typical three-phase induction
motors with 3 ratings complying with IE2 shipped in the domestic market were
calculated (however, if the performance value of 200 V/60 Hz is lower than thenominal performance of IE2, the ratio of IE2/IE3 was taken).
Then, each correction performance value (fields II, III and IV of Table 9 in the nextpage) was obtained by multiplying the above mentioned values by the performancevalues of 2 poles, 4 poles and 6 poles of IE3.
Based on the calculation above, the correction coefficients (i, j and k) by 3 ratings (6ratings) were made to be the values obtained by dividing the target standard values of
60 Hz (field I of Table 9) by the correction performance values (fields II, III and IV of
Table 9) respectively.

38

Table 9 Calculation of Coefficient of Each Rated Output by 3 Ratings (6 Ratings)
Rated output

[kW]
0.75
1.1
1.5
2.2
3.7
5.5
7.5
11
15
18.5
22
30
37
45
55
75
90
110
150
185 to 375

2 poles

4 poles

6 poles[60 Hz] Target Correction
Correction
Correction
Coefficient i
Coefficient j
Coefficient
standard
performance
performance
performance(= I/II)(= I/III)k (= I/IV)
value: I [%] value: II [%]value: III [%]value: IV [%]

85.5
86.5
86.5
89.5
89.5
91.7
91.7
92.4
93.0
93.6
93.6
94.1
94.5
95.0
95.4
95.4
95.4
95.8
96.2
96.2

75.5
82.5
84.0
85.5
87.5
88.5
89.5
90.2
90.2
91.0
91.0
91.7
92.4
93.0
93.0
93.6
94.5
94.5
95.0
95.4

1.1325
1.04851.02981.04681.02291.0362
1.02461.02441.03101.02861.0286
1.0262
1.02271.02151.02581.0192
1.00951.01381.01261.0084

84.4
84.9
84.9
88.2
88.2
90.8
90.8
91.4
91.7
92.5
92.5
93.1
93.5
94.0
95.1
95.1
95.1
95.4
95.8
95.8

1.01301.01881.01881.01471.01471.00991.00991.01091.0142
1.01191.01191.01071.01071.01061.0032
1.0032
1.0032
1.0042
1.0042
1.0042

81.8
86.3
87.3
88.0
88.0
89.5
89.5
90.4
90.4
91.7
91.7
93.1
93.1
93.8
93.8
94.3
94.3
95.1
95.1
95.1

1.0452
1.00230.99081.01701.01701.02461.02461.02211.02881.02071.02071.01071.01501.01281.01711.01171.0117
1.00741.01161.0116(4) About number of units shipped if shipped as 3 ratings (6 ratings) as listed in Note 3(Ideas of Note 4 of Table 1)
In case of three-phase induction motors having 3 ratings or 6 ratings, each unit has
multiple levels of energy consumption efficiency.
Meanwhile, when evaluating target standard values, it is required that the value
making the weighted average of the energy consumption efficiency measured as set
forth in Attachment 5 with the number of units shipped by each business operator ineach category, considering the matters stated in Notes 1 to 4 (P31 to P34), does not
become lower than the target standard value, so it is necessary to know the number ofunits of each rating from the number of three-phase induction motors shipped.
Therefore, based on the result of the survey on the actual use by end users, which
was obtained in the business commissioned in 2010, the quantity ratios were obtained
as per Table 10 and, using these ratios, the number of units shipped for each rating
was calculated.
Table 10 Quantity Ratios of Each Voltage and Frequency of 3 Ratings (6 Ratings)
Rated voltage
400 V
440 V
Rated voltage
200 V
220 V
Rated frequency 50 Hz
60 Hz
Rated frequency 50 Hz
60 Hz
Quantity ratio

50%

Rated voltage

30%

Quantity ratio

20%
200 V

Rated frequency

50 Hz

Quantity ratio

40%

220 V
60 Hz

25%

10%

39

50%

400 V
50 Hz
10%

30%

440 V
60 Hz

5%

10%

20%

Attachment 5

Energy Consumption Efficiency of Three-phase Induction Motors andits Measuring Method
1. Basic idea
The energy consumption efficiency of three-phase induction motors and its
measuring method shall be the performance obtained by the method specified by
Japanese Industrial Standards JIS C 4034-2-1 “Rotating electrical machines - Part
2-1: Methods for determining losses and efficiency from tests of single-speed,
three-phase, cage-induction motors” (hereinafter called JIS C 4034-2-1).
2. Specific energy consumption efficiency and its measuring method(1) Energy consumption efficiency
The energy consumption efficiency of three-phase induction motors shall be theratio (%) of output (W) against input (W) and it is calculated by the following formula
inputting the input P1 (W) and the total loss PT (W) obtained by the rated load test
conducted according to the rated load temperature test [6.4.4.1].
Efficiency (%) = (P1–PT)/P1×100
Where, the total loss PT is obtained as the sum of fixed loss [8.2.2.3], load loss
[8.2.2.4.1 (calculation method for load loss in the load test)] and stray load loss
[8.2.2.5.1 (calculation method for stray load loss in the load test which measurestorque)].
* The number in [ ] corresponds to the item number of JIS C 4034-2-1.
(2) Method for measuring energy consumption efficiency
The method of measuring three-phase induction motors shall be the test methodwith “low” uncertainty using commercial power supply specified by JIS C 4034-2-1.
However, the performance test for motors with auxiliary mechanisms specified by
5.1.3 of Japanese Industrial Standards JIS C 4034-30 “Rotating electrical machines Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors (IEcode)” shall be conducted without attaching the auxiliary mechanisms unless they are
indispensable for the structure of the motor to be tested. As regards motors madesolely for inverter driving, the measurement shall be conducted without driving
inverters using commercial power supply.

40

Attachment 6

Three-phase Induction Motor Evaluation Standards Subcommittee,
Energy Efficiency Standards Subcommittee of the Advisory Committee for
Natural Resources and Energy
Meeting History
First Subcommittee Meeting (December 13, 2011)- Disclosure of the Three-phase Induction Motor Evaluation Standards
Subcommittee- Current status of three-phase induction motors- Scope of three-phase induction motors- Energy consumption efficiency of three-phase induction motors and its measuringmethod- Others
Second Subcommittee Meeting (January 28, 2013)- Classification for setting target for three-phase induction motors- Target fiscal year and target standard values for three-phase induction motors- Interim report- Others

41

Attachment 7

Three-phase Induction Motor Evaluation Standards Subcommittee,
Energy Efficiency Standards Subcommittee of the Advisory Committee for
Natural Resources and Energy
List of Members
Chairman: Ryuichi Yokoyama

Professor, Graduate School of Environment andEnergy Engineering, Faculty of Science andEngineering, Waseda University

Members: Masayuki Ushikubo

Section Manager, Technical Department,
Machine Tool Builders’ Association

Japan

Takeshi Obata

Chairman, High Efficiency Motor Promotion
Committee, The Japan Electrical Manufacturers’
Association

Masaharu Kira

General Manager, Industrial Machinery Department
1 and Technical Department, The Japan Society ofIndustrial Machinery Manufacturers

Hidetoshi Sagawa

Counselor, Technical Department, The Japan
Refrigeration and Air Conditioning Industry
Association

Akira Chiba

Professor, Graduate School of Engineering, Tokyo
Institute of Technology School of Engineering

Takahiro Tsurusaki

Chief Executive Researcher, Jyukankyo ResearchInstitute Inc.

Yoichi Hanji

Senior Advisor, The Energy Conservation Center,
Japan

Koichi Yasuoka

Professor, Graduate School of Engineering, Tokyo
Institute of Technology School of Engineering

Hiroshi Yoshimiya

Chief Engineer, Senior Expert of Audit Division,
Nikken Sekkei Ltd.

42