Demonstrator 2020 – Electric Motor

The demonstrator was developed with the aim of testing different magnet alloys in the application of an electric motor. In particular, the effect of the installed magnets on the efficiency of the motor, depending on the motor and magnet temperature, is of interest here. For the realization of the demonstrator, requirements were found first, and the approaches were then evaluated based on a utility analysis. The motor test bench has a test motor with 1450W and a load motor with 2036W nominal power. Both motors are permanent magnet excited synchronous motors. To realize the exchangeability of the magnets, four identical test motors are provided, whose rotors can be equipped with alternative magnets. In addition, a fifth motor with water cooling is available to enable future integration of magnetocaloric cooling. In order to be able to take the demonstrator to conferences or similar events, the test stand was mounted on a table trolley. The torque is measured a sensor shaft that connects the shafts of the test motor and the load motor. The speed is detected by the motor resolvers and can be read out by the software of the frequency converters of the motors. To measure the motor temperature, a temperature sensor is mounted on the motor coil of the test motor. In addition, a pyrometer can be used to measure the magnet temperature without contact. Voltage and current sensors determine the electrical motor input power. All sensor data can be read directly on the test stand monitor. The efficiency of the motor is calculated using the data of electrical input power and mechanical output power, where the output power depends on speed and torque.