Cogging Torque and Torque Ripple Test Systems

ATM/ATV Cogging Torque and Torque Ripple Test systems

We measure cogging torque characteristics of the motor by rotating it by 360° in a non-excitation state while measuring torque and rotation angle.
We measure torque ripple characteristics of the motor by rotating it by 360° in an excitation state while measuring torque and rotation angle.
For high-quality motors designed to operate quietly with low vibration, cogging torque and torque ripples must be reduced to very low levels to minimize vibrations.
In our system, the test motor shaft is coupled to the tester shaft that rotates at 1 r/min. The torque generated as the motor shaft is rotated by 360° is measured at a resolution of 0.1°. We have a considerable experience and expertise to manufacture couplings and fixtures to accommodate various motor shapes and characteristics.
Our system also measures detent torque or holding torque for stepping motors.

ATM Series Cogging Torque Testing

ATM series for small motors

The ATM series are specially designed for measuring cogging torque and torque ripple of small/miniature motors. They incorporate exclusive high-sensitivity torque and angle sensors capable of measurements at a resolution of 0.1°. The system also measures detent torque or holding torque of stepping motors.
We offer seven models, ranging from the ATM-R5MN with a torque rating of 0.5 mN・m to the ATM-100MN with a torque rating of 100 mN・m. This series uses the PC-MCT6-09 Motor Analyzer. A dedicated software comes with it.

Specifications of ATM series

Motor Analyzer PC-MCT6-09
Max Torque ATM-R5MN:0.5 mN・m
ATM-2MN:2 mN・m
ATM-5MN:5 mN・m
ATM-10MN:10 mN・m
ATM-20MN:20 mN・m
ATM-50MN:50 mN・m
ATM-100MN:100 mN・m
Torque Accuracy ±1% of FS
Angle Accuracy ±1.5°
Test Speed 1 rpm

ATV Series for Mid-Size Motors

ATV series measures motors with a cogging torque or torque ripple of 100 mN・m or greater. The motor fixture holds the motor and couples the motor shaft to the tester shaft. This series incorporates a high-sensitivity torque sensor that shares the same basic design as the ATM series. We offer seven models of sensors for ATV-3 with torque ratings from 100 mN・m to 10 N・m, and four models of sensors for ATV-5 with torque ratings from 20 Nm to 200 Nm. These sensor units are user-replaceable.
The controller is the PC-MCT6-09 Motor Analyzer, which can also be used for the ATM series torque meters.

Specifications for ATV Series

Motor Analyzer PC-MCT6-09
Max Torque of Sensors for ATV-3 TS-100MN3:100 mN・m
TS-200MN3:200 mN・m
TS-500MN3:500 mN・m
TS-1N3:1 N・m
TS-2N3:2 N・m
TS-5N3:5 N・m
TS-10N3:10 N・m
Max Torque of Sensors for ATV-5 TS-20N5:20 N・m
TS-50N5:50 N・m
TS-100N5:100 N・m
TS-200N5:200 N・m
Torque Accuracy ±0.5% of FS
Angle Accuracy ±1°
Test Speed 1-20 rpm variable

Primary Advantages of ATM Series and ATV Series

  • Exclusively designed high-sensitivity torque sensor
    Accurate measurement is often difficult in the angular range where cogging torque gradually decreases. Our high-sensitivity torque sensor with optimal constant of spring designed exclusively to measure small cogging torque enables torque measurement at all ranges, including positive and negative torque.
  • Benefits of vertical torque sensor
    Arranging the sensor vertically eliminates one (=the test motor side) of the two bearings that would hold the sensor, reducing mechanical losses. Moreover, it dramatically improves shaft alignment precision.
  • Motor fixing jig for accurate measurements of very low cogging torque
    We configure a jig set ideally suited for your motor type and the torque value range. Our extensive experience in designing jigs allows testing of small fan motors lacking shafts, for example.

Calibration Jig Set (Option)

The ATM/ATV series has a vertical shaft, so the Calibration Jig Set converts the vertical force of the weight into a horizontal force when calibration.

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