Test system for electric motors

Test system for inverters and 3-phase asynchronous motors of mild hybrids under environmental conditions.

Industry: Automotive industry / electric motors


Electric motors of mild hybrid vehicles shall be tested under conditions as close to reality as possible. Besides different static and dynamic function tests, the 3-phase asynchronous motor, as well as the inverter, shall be cooled down to -20 °C and heated up to +70 °C afterwards. Thus, the demands on motors that can occur during operation of an electric / hybrid vehicle are simulated.

The test system is to be used in the analysis for persistent tests which are not possible in production due to short cycle times.


To be able to test the motor, inverter and the end product (motor + inverter) separately, three single test stations were developed and combined in one compact system.

Motor station
The inserted motor is operated by a 48 V inverter at different load-points and tested. The carried out tests include voltage measurement, current measurement up to max. 500 A, COS-Phi calculation (ratio between reactive power Q and apparent power S), performance calculation and the locked-rotor test. During this test, the rotor is blocked with the help of a servo motor and a low voltage is applied to determine the short-circuit current of the motor.

Inverter station
The inverter is connected to a motor simulation as well as to the cooling cycle of the system for the first time. Besides a voltage and current measurement up to max. 400 A, the performance and the correct communication of the CAN interface are tested.

Complete system station
The DUT (inverter + motor) is connected to the 48 V supply and the cooling cycle. A load machine is connected to a pulley wheel and the complete test proceeds fully automatically. During testing and in addition to the load tests, an environment simulation is carried out where the DUT is cooled down to -20 °C and heated up to +70 °C afterwards. Thus, the DUT is tested under conditions as close to reality as possible. An automatic discharge per software at the end of the test guarantees the personnel’s security.

  • Testing under "real" conditions
  • Compact combination of three test stations
  • Fully automatic test process after connection
  • Low personnel expenditure for testing
  • Easy and intuitive operation
  • Expansion possible for future DUT
  • Maximum flexibility due to a generous construction of all components
  • Possibility of expansion by additional interfaces and work piece carriers
  • Freely configurable endurance test for all three DUT components
  • DUT of different manufacturers can be tested on one system
  • Current measurement up to 500 A
  • Endurance test with cooling / heating circuit from -20 °C up to +70 °C
  • Freely adjustable load points via load machine (+/- 120 Nm, +/- 3,000 rpm)
  • Numerous communication interfaces
  • Electronically controlled voltage and current sources: +/- 385 A and 0-60 V
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