The resistance controller 64 is connected with the plurality of stator windings 311 of the permanent-magnet synchronous motor 3 and the electromagnetic resistance generation device 5. The resistance controller 64 comprises a first rectifier and filter circuit 641 and a pulse width modulation (PWM) control circuit 642. The first rectifier and filter circuit 641 is connected with the stator windings 311 of the permanent-magnet synchronous motor 3. The PWM control circuit 642 is connected with the first rectifier and filter circuit 641 and the electromagnetic resistance generation device 5. According to a DC voltage generated by the first rectifier and filter circuit 641, the PWM control circuit 642 generates a PWM control signal S1 to control an electromagnetic field intensity of the electromagnetic resistance generation device 5.

The control device 6 further comprises an angle detection unit 65, which detects an angle of a rotating spindle of the permanent-magnet synchronous motor 3 and generates an angle signal S2 to the processing unit 61. The angle detection unit 65 can be an encoder. By means of the angle detection unit 65, a rotor angular position of the permanent-magnet synchronous motor 3 can be identified to accurately generate a stator exciting field for generating an effective torque.