Drive concepts for hybrid and electric vehicles are based on high-performance compact three-phase machines with corresponding power electronics. KRATZER AUTOMATION provides scalable, automated electric motor test stands for testing and characterizing these drives in the development process. Typical applications for these test stands include efficiency studies, thermal studies, endurance tests and dynamic tracking tests with vehicle simulation. Other tests are used for function development.
The test stand consists of a special foundation with air springs, a mounting bracket for the test sample machine, the load machine and battery simulator. Operation with a real high-voltage battery is optional. The conditioning system for the cooling liquid ensures reproducible conditions in the cooling circuit depending on the load status. On request the test stand can be equipped with a climatic chamber for simulating ambient conditions. Our flexibly configurable PAtools TX automation system controls and regulates the test stand with its auxiliary equipment and acquires all measuring and computing quantities.
Beside the typical e-motor test stand (DUT e-motor is connected to test bench drive), we are able to provide further setups. As an option, an industrial gearbox might be used to adapt speed and torque. This setup allows to test either high speed DUT e-motors or high torque DUT e-motors.
Other setups are the so called back-to-back configurations. In this case, two DUTs are linked to each other. A test bench drive won’t be used. If the DUTs are a e-motors, the “motor-to-motor” setup looks like shown here:
In case of the DUTs are electric axle units (e-axle), the two DUTs are linked to each other by using side mounted gearboxes as shown here:
