For new energy motor test bench, couplings are used to connect the test motor with load equipment or dynamometers to simulate actual working conditions and test motor performance parameters such as torque, speed, and efficiency. Couplings must have high torque transmission capabilities, precision, and good dynamic balance characteristics to ensure the accuracy and repeatability of test data. 
In some high-speed or high-load test scenarios, couplings also need excellent elasticity and the ability to compensate for axial, radial, and angular misalignments to adapt to dynamic changes during testing.