Cogging Torque and Torque Ripple Test Systems
For DC motors, BLDC motors, AC servo motors, and stepping motors

Cogging Torque Tester

Torque Sensor

SeriesMotor Evaluation Software

To reduce motor noise and vibration and achieve high-efficiency motors

Cogging Torque and Torque Ripple Measurement

Cogging Torque Tester
To reduce motor noise and vibration, cogging torquemust be measured and reduced. Sugawara’s Cogging
Torque and Torque Ripple Test Systems can measure
cogging torque with high accuracy and no mechanicalloss for a variety of motors (DC, DC brushless, ACservo, stepping, etc.).
These systems can play a significant role in motor
development and quality management.

Main features
Measures cogging torque with no mechanical loss

Short takt time

Enables measurement of both cogging torqueand torque ripple on one piece of equipment

Measurements can be completed in as little as 3 sec (at therotation speed of 20 r/min). A vertical structure simplifies axialalignment and shortens measurement time.

Supports a wide range of torque values at low cost through theswitching of torque sensors

Convenient analysis functions
Peak-number and frequency analysis can be performed by FFT
in addition to display functions in XY coordinates and polar
coordinates.

High accuracy
Measurement angle resolution: 0.01°
Maximum number of data items collected per revolution: 36,000

Supports simultaneous measurement of various
types of external sensors

Exceptionally high measurement reproduction

Supports voltage, current, and temperature measurements
Measurement of resolver/hole sensor output contributes toimproved controllability (using optional I/O module).

What is cogging torque?

1

2

When turning the shaft of a permanent-magnet type of motor (brushlessmotor, etc.) in a non-energized state with one’s fingertips, you can feel arelatively constant amount of friction torque and a pulsating torque at thesame time. This friction is called motor mechanical loss that arises fromthe bearings used to support the rotor and the contact made between thebrushes and commutator. The pulsating effect, on the other hand, arises
from the attraction between the rotor magnets (1) and stator-yoke teeth (2).
This friction and pulse effect are commonly called loss torque and cogging
torque, respectively.

NN

Cogging torque results in uneven torque and rotation when driving the motor, which gives rise to noise andvibration and generates disturbances in the control process. In recent years, brushless motors, which are known
for their high-efficiency, compact, and maintenance-free features in addition to high controllability, have been
installing high-performance magnets in a small space, which makes it easy for cogging torque to occur. Accurate
measurement and understanding of cogging torque is essential to the design and adoption of high-quality motors.

System configuration
The ATM-100 and ATV-100 Cogging Torque Tester connect directly to a personal
computer running Windows.
Users can switch between five types of torque sensors from 1 mN·m to 10 N·m
on their own.

POWER

COGGING T ORQUE T ESTERCWCCWSoftwareHigh-accuracy torque sensors(1 mN·m)(10 mN·m)

Cogging Torque Tester(100 mN·m)(100 mN·m)

CW

CCW

(1 N·m)I/O Module(Option)

ANGLE P OSITI ON
POWER

CCW

CW

COGGING TORQUE & TORQUE RIPP LE TES T SY STEM

Cogging Torque Tester(10 N·m)

Vertical sensors use no axle bearings therebyeliminating mechanical loss that can lead tomeasurement error.
A vertical arrangement also simplifies alignmentof the sensor shaft and motor shaft.

Softwareis specialized software developed for the ATM-100 and ATV-100 Cogging Torque Testers.
It displays cogging torque and torque ripple of the test motor on a variety of graphs.

Main features
Displays measurement results on a XY-coordinatesgraph, polar-coordinates graph, and FFT graph.
FFT-graph display enables processing method, window function,etc. to be selected from a pull-down menu so that desired
measurement conditions can be quickly set.

Expanded functions through an I/O module
Connecting the I/O module to the personal computer enables avariety of expanded functions to be used.

Simultaneous plotting of input data on graphs
Up to 8 channels of external data can be input andsimultaneously displayed with angle-torque characteristics.
Units and scaling/offset values can be set. Various types ofdata such as voltage, current, temperature, and motor rotation
position from a position sensor can be simultaneously
displayed to support motor-control development.

Control of external motor power supply

XY coordinates graph

Polar coordinates graph

FFT graph

Torque calibration
Calibration can be easily performed by software. No volumeadjustments, etc. are necessary. The ATM/ATV series has avertical shaft, so the Calibration Jig Set converts the verticalforce of the weight into a horizontal force when calibration.
(The Calibration Jig Set is an option.)

Operating conditions
OSCPUMemory
MonitorDVD drive
Com. Ports

Windows10(64bit) Professional Japanese or English version
Intel Core i5 or later processor
8 GB or more recommended
HD FWXGA 1366×768 or greater
One or more units (required for software installation)
USB port x 1 (2 ports when using the I/O module)

Enables ON/OFF control of the motor power supply
synchronized with the starting/stopping of torque-ripple
measurements.
Automatic ON with appropriate timing when starting
measurements and automatic OFF when stopping
measurements prevents motor damage caused by failure tocut the power supply.

I/O Module (Option)

Input voltage signal overlaid on cogging torqueCogging Torque and Torque Ripple Measurement

Motor Fixtures
for Accurate Measurements
An XYZ stage for the ATM-100 and a standard motor fixtures for theATV-100 are provided. Customized jigs and couplings are available
according to motor type, shape, and torque characteristics. Customers
can also contact us about measurement of fan and pump motors withno protruding shaft.

XYZ stage
for theStandard motor fixture
for theDimensions
600
120°

300

350

POWE R300

COGGING TORQUE TE STER

350
CW

P.C.D 180

ATM-100

3-M8

CCW

POWE R

Torque Sensor

Torque Sensor
COGGING TORQUE TE STERCWTorque Sensor

ATM-100

XYZ stage

CCWCCWZ axis: 0–30 mm
X and Y axes: ±25 mmXYZ stage

CW

AN GL E POSITION

POWE R

CCWCW

Z axis: 0–30 mm
X and Y axes: ±25 mm

C OGGIN G TOR QUE TES TE R+ Height option

Specifications
Cogging Torque Tester
Torque Sensor
Rated torque

1 mN·m

10 mN·m

100 mN·m

1 N·m

10 N·mSensor shaft diameter
Torque accuracy±0.5% of rated torque *1

Rotation speed

0.1–20 r/min (at intervals of 0.1 r/min)Angle resolution

0.01°

Number of acquired data items
and sampling interval

Connection with personal computer

Rotation speed [r/min]
0.1– 1.5
1.6– 3.03.1– 8.0
8.1–15.0
15.1–20.0

Data items
36,00018,000
7,200
3,600
1,800

Sampling interval
0.01°
0.02°
0.05°
0.10°
0.20°

USB (RS422 can be selected as an option at ordering time.)

Power requirement

100–240 VAC, 50/60 Hz

Operating temperature

0–40°COperating humidity

20–90%RH, No condensation

Dimensions (W×D×H)
Weight*1 After calibration with ATM-100/ATV-100

300 × 350 × 540 m
300 × 350 × 758 m *2

600 × 350 × 391 m

70 kg
80 kg *255 kg*2 When HC-ATM-100 height option is selected.

Data measurement services using Sugawara's motor testers are available.
Please visit our website for more information.

The above specifications are subject to change without prior notice for
product improvement.

Products: Xenon Flash, Torque Dynamometers, Bearing Inspection Systems, etc.

Head office
Tokyo sales office

8-2 Minami-Kurokawa, Asao-ku, Kawasaki-shi, Kanagawa, 215-0034, Japan
Tel: +81-44-989-7320 Fax: +81-44-989-7338

Osaka sales office6-17 Yokomakura-Nishi, Higashiosaka-shi, Osaka, 578-0956, Japan
Tel: +81-72-966-1061 Fax: +81-72-966-0961

Nagoya sales office 1-2-29 Kamimaezu, Naka-ku, Nagoya-shi, Aichi, 460-0013, Japan
Tel: +81-52-331-6562 Fax: +81-52-331-6604
URL: https://www.sugawara-labs.co.jp/

E-mail: info@sugawara-labs.co.jp
YC2307-01