Miniature Motor

Testing Systems for Miniature Motors (Electric Micro Drives)

Automatically measures and records: Torque, Speed, Power Input, Power Output, Efficiency, and Temperature rise and related data during motor operation under predefined rated point.


There is a wide range of applications for such miniature motors.

The determination of performance characteristics of electric drives in fox-glove sizes, with rated power in the magnitude of 0.5-1 W, is hard to achieve with conventional methods. When testing such motors, no external forces should act on the test object. But this is possible to do, with Motomea’s acceleration dynamometer.

Motomea gives you the ultimate solution as is demonstrated by testing a micro motor of 0.65 W.

The procedure for testing electric drives allows assessing complete static and dynamic characteristics in seconds. The test system for electric drives offers manufacturers and/or users everything they want to know about the properties of their motors, apart from endurance testing at a determined load point. With this method, a motor is freely accelerated from stall up to no load speed. The load is only its own rotor inertia. The rotor’s moment of inertia is determined easily with a very simple procedure.

Comprehensive Test Possibilities

Current, voltage, and speed over time are measured in microsecond intervals. Normally, the speed is measured
over time during the acceleration and deceleration phases, by a sensor of high resolution coupled to the motor shaft. The time for testing corresponds to the time needed for accelerating and decelerating the motor; this means a few seconds for small motors and fractions of a second for micro motors.

A speciality of the Motomea method is the capability to simultaneously take a multitude of synchronized readings in μs intervals, and evaluate those to the specific characteristic, with the aid of modern Windows-based software. Also, in seconds, a motor-specific test report is generated in the form of graphs and tables, containing also general data,  company and motor designations. The data shown in Table 1 is freely selectable.

Evaluation of the Test Results

The following charts Figs. 2 – 5 show executed measurements of static and dynamic characteristics of a 12 VDC motor, with a rated power output of 0.65 W.

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