Tiny 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 small / tiny motors. It automatically obtains the T-N characteristic of tiny motor with high accuracy.

For small & Tiny torque testing, this is the most mature and highest precision of measurement method.


  • 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. For micro motors, zero inertia testing is possible by winding the brake thread directly on the shaft.

Tiny Motor Curve (x-axis: RPM y-axis: Torque (g.cm))

Tiny motor Dynamometer test system
Micro Motor Dynamometer Test System
Small Motor Dynamometer
Small motor torque tester

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

ModelLoad-Sensor(Pulley Diameter) [mm]
Directly around the axis*15mm10mm20mm40mm
JP-R5N0.5 N1.25 mNm2.5 mNm5 mNm10 mNm
JP -1N1N2.5 mNm5 mNm10 mNm20 mNm
JP -2N2N5 mNm10 mNm20 mNm40 mNm
JP -5N5N12.5 mNm25 mNm50 mNm100 mNm
JP -10N10N25 mNm50 mNm100 mNm200 mNm
JP -20N20N50 mNm 100 mNm200 mNm400 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:

BrakeProny braking
Load-SensorSix types: 0.5 N, 1 N, 2 N, 5 N, 10 N, 20 N
Sensor sensitivityDC 2 V / rating
Torque measurement precisionWithin ±1% of torque range
Maximum allowable load200% of Sensor rating
Torque measurement rangeT = Sensor Rating × Pulley Diameter / 2
Computer Operating SystemMicrosoft Win7
Power supplySingle-phase AC 100 – 120 V ±10%, 50 / 60 Hz
Single-phase AC 200 – 240 V ±10%, 50 / 60 Hz


  1. Add Non-contact speed Sensor, which can measure the T/N curve of motor
  2. Add power-analyzer, which can measure the motor’s input V / A / W & motor efficiency