Preliminary Analysis Public Meeting Supplementary Handout

ENERGY EFFICIENCY PROGRAM

FOR COMMERCIAL EQUIPMENT:

ENERGY CONSERVATION STANDARDS FOR ELECTRIC MOTORS

August 21, 2012

U.S. Department of Energy

Assistant Secretary

Office of Energy Efficiency and Renewable Energy

Building Technologies Program

Appliances and Commercial Equipment Standards

Washington, DC 20024
Table 1 - Electric Motors Considered for Minimum Energy Efficiency Standards

Motor Type

New Definition 

Considered for

CFR1? 

Test Procedure 

Revision Necessary? 

Currently Subject to 

Minimum Energy 

Efficiency Standards? 

Would be Subject to 

Minimum Energy 

Efficiency Standards

Under Planned 

Approach?

Air-Over Electric Motor Yes No No No

Component Set of an Electric 

Motor 

Yes No No No

Electric Motor with Customer 

Defined Endshields or Special 

Flanges

Yes No No Yes

Electric Motor with Single or 

Double Shafts of Non-Standard 

Dimensions or Additions 

No No Some Yes

Electric Motor with Non-Standard 

Base or Mounting Feet No No Some Yes

 

1 Code of Federal Regulations.
Motor Type

New Definition 

Considered for

CFR1? 

Test Procedure 

Revision Necessary? 

Currently Subject to 

Minimum Energy 

Efficiency Standards? 

Would be Subject to 

Minimum Energy 

Efficiency Standards

Under Planned 

Approach?

Electric Motor with Sleeve 

Bearings No No No Yes

Electric Motor with Thrust 

Bearings No Yes No Yes

Encapsulated Electric Motor Yes No No Yes

IEC Design N Electric Motor Yes No Yes Yes

Immersible Electric Motor Yes Yes No Yes

Integral Brake Electric Motor Yes Yes No Yes

Inverter-Capable Electric Motor Yes Yes Yes Yes

Inverter-Only Electric Motor Yes No No No
Motor Type

New Definition 

Considered for

CFR1? 

Test Procedure 

Revision Necessary? 

Currently Subject to 

Minimum Energy 

Efficiency Standards? 

Would be Subject to 

Minimum Energy 

Efficiency Standards

Under Planned 

Approach?

Liquid-Cooled Electric Motor Yes No No No

NEMA Design A Electric Motor Yes No Yes Yes

NEMA Design C Electric Motor Yes No Yes Yes

Non-Integral Brake Electric Motor Yes Yes Yes Yes

Partial Electric Motor Yes Yes No Yes

Submersible Electric Motor Yes No No No

Totally Enclosed, Non-Ventilated 

Electric Motor Yes Yes No Yes

Vertical Hollow-Shaft Electric 

Motor 

No Yes No Yes
Motor Type

New Definition 

Considered for

CFR1? 

Test Procedure 

Revision Necessary? 

Currently Subject to 

Minimum Energy 

Efficiency Standards? 

Would be Subject to 

Minimum Energy 

Efficiency Standards

Under Planned 

Approach?

Vertical Solid-Shaft Electric 

Motor No Yes Yes Yes
Table 2 - Planned Definitions

Motor Type New Definition

Air-Over Electric Motor ...means an electric motor designed for cooling by a ventilating means external to and not supplied with the motor. 

Component Set of Electric Motor ...means a combination of motor parts that require more than the addition of two endshields to create an operable motor. 

These parts may consist of any combination of a stator frame, wound stator, rotor, shaft, or endshields. 

Electric Motor with Customer 

Defined Endshields or Special 

Flanges

...means an electric motor with customized flanges which do not conform to NEMA MG1–2011 paragraphs 1.63.1, 1.63.2, 

or 1.63.3. 

Encapsulated Electric Motor

...means an electric motor that has an insulation system which, through the use of materials, processes, or a combination of 

materials and processes, results in windings and connections that are sealed against contaminants. This type of machine is 

intended for environmental conditions and shall be capable of passing the conformance test in NEMA MG1-2011 section 

12.62. 

IEC Design N Electric Motor

...means a three-phase cage induction motor intended for direct-on-line starting, having 2, 4, 6, or 8 poles, rated from 0.4 

kW to 1600 kW and conforming to the IEC60034-12 edition 2.1 torque characteristics in section 6.1, locked rotor apparent 

power in section 6.2, and starting requirements in section 6.3. 

Immersible Electric Motor ...means an electric motor designed to withstand complete immersion in liquid for a limited amount of time. 

Integral Brake Electric Motor ...means an electric motor containing a brake mechanism either inside of the motor endshield or between the motor fan and 

endshield such that removal of the brake component would require extensive disassembly of the motor or motor parts. 

Inverter-Capable Electric Motor ...means an electric motor that can run continuously when directly connected to a polyphase, sinusoidal bus, but is also 

capable of handling continuous operation on an inverter drive. 

Inverter-Only Duty Electric Motor ...means an electric motor designed such that it can only be run continuously when operated through an inverter drive. 
Motor Type New Definition

Liquid-Cooled Electric Motor ...means an electric motor that is cooled by circulating liquid, with the liquid or liquid conductors coming into direct 

contact with the machine parts.

NEMA Design A Electric Motor

...means a squirrel-cage motor designed to withstand full-voltage starting and developing locked-rotor torque as shown in 

NEMA MG1-2011 12.38, pull-up torque as shown in NEMA MG1-2011 12.40, breakdown torque as shown in NEMA 

MG1-2011 12.39, with locked-rotor current higher than the values shown in 12.35.1 for 60 hertz and 12.35.2 for 50 hertz 

and having a slip at rated load of less than 5 percent for motors fewer than 10 poles. 

NEMA Design C Electric Motor

...means a squirrel-cage motor designed to withstand full-voltage starting, developing locked-rotor torque for special hightorque applications up to the values shown in NEMA MG1-2011 12.38, pull-up torque as shown in NEMA MG1-2011 

12.40, breakdown torque up to the values shown in NEMA MG1-2011 12.39, with locked-rotor current not to exceed the 

values shown in 12.35.1 for 60 hertz and 12.35.2 for 50 hertz, and having a slip at rated load of less than 5 percent. 

Non-Integral Brake Electric Motor ...means an electric motor containing a brake mechanism attached externally in such a manner that it could be readily 

detached from the motor without extensive disassembly of the motor or motor components. 

Partial Electric Motor ...means an electric motor necessitating only the addition of one or two endshields with bearings to create an operable 

motor. Included under this definition are integral motors and partial 3⁄4 motors. 

Submersible Electric Motor ...means an electric motor designed for continuous operation while submersed in liquid. Such a motor is unable to operate 

continuously if not submersed in liquid. 

Totally Enclosed, Non-Ventilated 

(TENV) Electric Motor

...means an electric motor that is a frame-surface-cooled, totally enclosed machine which is only equipped for cooling by 

free convection.
Table 3 - Planned Test Procedure Language Additions

Motor Type Planned Test Procedure Language Addition

Electric Motor with Sleeve 

Bearings

Electric motors with sleeve bearings are to be tested without removing the sleeve bearings, and testing the motor in the 

same manner as a general purpose electric motor.

Electric Motor with Thrust 

Bearings

Electric motors with thrust bearings are to be tested with the motor mounted horizontally on the test bench and with the 

thrust bearings removed and replaced with rolling element, deep-groove radial ball bearings. 

Immersible Electric Motor Immersible electric motors are to be tested with the seals removed during testing.

Integral Brake Electric Motor Integral brake electric motors are to be tested with the integral brake component attached to the motor, with the brake 

component energized as it would be during field-application duty. 

Inverter-Capable Electric Motor Inverter-capable electric motors are to be tested with no inverter drive connected to the motor. 

Non-Integral Brake Electric Motor Non-integral brake electric motors are to be tested with the brake component physically removed prior to testing, including 

any electrical connections the brake component has to the electric motor.

Partial Electric Motor

Partial electric motors are to be tested with endplate(s) and the necessary rolling element, deep-groove radial ball-bearing(s) 

attached to either the drive-end, non-drive end, or both ends of the motor. Endplates may either be fabricated by the NISTcertified motor testing laboratory performing the testing or supplied by the motor manufacturer. 

Totally Enclosed, Non-Ventilated 

Electric Motor Totally enclosed, non-ventilated electric motors are to be tested in the same manner as a general purpose electric motor.

Vertical Hollow-Shaft Electric 

Motor 

Vertical hollow-shaft electric motors are to be tested with the motor mounted horizontally on a test bench. A shaft extension 

shall be attached to the hollow-shaft portion of the motor in a manner that allows the motor to attach to a dynamometer. 

Thrust bearings not capable of operating in a horizontal orientation are to be removed and replaced with rolling element, 

deep-groove radial ball bearings. 
Motor Type Planned Test Procedure Language Addition

Vertical Solid-Shaft Electric 

Motor 

Vertical solid-shaft electric motors are to be tested with the motor mounted horizontally on the test bench. Thrust bearings 

not capable of operating in a horizontal orientation are to be removed and replaced with rolling element, deep-groove radial 

ball bearings.