Energy saving: the power generating unit is required to support the operation of the dynamometer. The intelligent energy feedback device is used to realize the four quadrant operation, which makes the power grid back to the power grid.

Optimal frequency conversion control: the traditional motor frequency conversion system is affected by the regeneration of the motor, the motor speed reducer is greatly limited, and the special intelligent feedback device is added to solve the problem. Therefore, it is not only used to control the dynamometer, but also to control the motor to improve the dynamic response capability of the servo system.