The more complex motor controller can accurately control the speed and torque of the motor, and may also be a part of the closed loop control system of the mechanical control position. For example, the CNC lathe needs to accurately control the position of the tool according to the preset curve, and compensate according to the load and external forces to maintain the tool in the given position.

The motor controller is an integrated circuit that controls the motor to work according to the set direction, speed, angle and response time through active work. In the electric vehicle, the function of the motor controller is to convert the electric energy stored in the power battery into the electric energy required to drive the motor according to the gear, accelerator, brake and other commands, to control the driving state of the electric vehicle, such as the starting operation, forward and backward speed, climbing strength, or to help the electric vehicle brake, and store part of the braking energy in the power battery. It is one of the key components of electric vehicles