The permanent magnet governor is composed of a conductor rotor, a permanent magnet rotor and a controller. The conductor rotor on the driving side is connected with the motor shaft, and the permanent magnet on the load side is connected with the working machine. There is a certain air gap between the two turntables, and the controller is used to adjust the size of the air gap. When the motor rotates, the copper ring of the conductor rotor generates an induced eddy current when cutting the magnetic field lines of the permanent magnet, and the force between the magnetic field of the induced eddy current and the magnetic field of the permanent magnet realizes the torque transmission between the motor and the working machine.