Stepper Motor Test System

Stepper Motor & Mini Motor Torque Test System_1-1

With the unique application of Prony (winding) braking, which is the most proven

method for torque testing of stepper motors. It automatically obtains the full pull-in and pull-out torque curves with high accuracy.


Pull-in torque: The maximum torque at which the motor can start from holding state without losing steps for a given speed

Pull-out torque: The maximum torque at which the motor can operate without losing steps for a given speed


Advantages:

  • Minimal moment of inertia of the tester
    • By adopting Prony braking, the system provides stable measurement unaffected by moment of inertia of the tester and coupling loss, which is unavoidable in conventional
    • torque testers. The advantage is obvious especially in pull-in torque testing. For micro motors, zero inertia testing is possible by winding the brake thread directly on the shaft.

Pull-in & Pull-out Curve (x-axis: Frequency y-axis: Torque)

Stepper Motor & Mini Motor Torque Test System_2

Pull-in Pull-out Test data

Stepper Motor & Mini Motor Torque Test System_3

Torque / Load-Sensor / Pulleys Specifications are as follows:

Model Load-Sensor (Pulley Diameter) [mm]
Directly around the axis*1 5mm 10mm 20mm 40mm
JP-R5N 0.5 N 1.25 mNm 2.5 mNm 5 mNm 10 mNm
JP -1N 1N 2.5 mNm 5 mNm 10 mNm 20 mNm
JP -2N 2N 5 mNm 10 mNm 20 mNm 40 mNm
JP -5N 5N 12.5 mNm 25 mNm 50 mNm 100 mNm
JP -10N 10N 25 mNm 50 mNm 100 mNm 200 mNm
JP -20N 20N 50 mNm  100 mNm 200 mNm 400 mNm
  • Directly around the axis *1: Torque and motor shaft diameters.
  • Using a pulley: torque ( mNm ) = Load – Sensor ( N ) x Pulley diameter ( mm ) / 2
  • Do not use pulleys: torque ( mNm ) = Load – Sensor ( N ) x Motor shaft diameter ( mm ) / 2

System specifications are as follows:

Brake Prony braking
Load-Sensor Six types: 0.5 N, 1 N, 2 N, 5 N, 10 N, 20 N
Sensor sensitivity DC 2 V / rating
Torque measurement precision Within ±1% of torque range
Maximum allowable load 200% of Sensor rating
Torque measurement range T = Sensor Rating × Pulley Diameter / 2
Drive frequency range 16 – 50,000 Hz
Drive signals Square wave (duty 1 : 1), TTL-level voltage signal or open-collector signal
Computer Operating System Microsoft Win7
Power supply Single-phase AC 100 – 120 V ±10%, 50 / 60 Hz
Single-phase AC 200 – 240 V ±10%, 50 / 60 Hz