Header: Electric motor test benches

Electric motor test benches

Electric motor test benches

  • Proven mechanics concept
    Foundation with air springs and test sample holder in a vibration-optimized design, as specially required for high speeds. Safe distance between the maximum speed and the first natural system frequency.
  • Highly dynamic drive technology
    Compact load machines with low mass moment of inertia and highly accurate speed and torque measurements.
  • Simulation of ambient conditions and the coolant circuit
    Cooling fluid conditioning with control of temperature, flow rate and pressure, optionally with separate cooling circuits for the test sample motor and inverter. On request a temperature chamber for simulating ambient air.
  • Various test bench setups
    Setups available like e-axle back-to-back, e-motor back-to-back (motor-to-motor) or additional test bench gearbox.
  • Flexible, open test stand software
    Process control, test stand control and simulation as well as synchronous measured value acquisition and processing. All processes and parameters can be freely modified by the customer.

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.

E-motor plus test bench gearbox

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.

E-Motor back-to-back

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:

E-axle back-to-back

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:

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Electric motor test benchesElectric motor test benches