Thus, the main purpose of the present invention is to provide a driving and resistance control system of a permanent-magnet synchronous motor, which helps alleviate the shortcomings of the known exercise equipment resistance systems.

A technical solution adopted in the present invention comprises an electromagnetic resistance generation device arranged adjacent to an external rotor of a permanent-magnet synchronous motor. A control device comprises a processing unit, a motor driving circuit, a resistance controller, and an interlock switch. In a first operation mode, the interlock switch makes the motor driving circuit and the permanent-magnet synchronous motor open-circuiting, and connecting stator windings of the permanent-magnet synchronous motor to the resistance controller, and under this condition, the external rotor of the permanent-magnet synchronous motor is rotated by spinning of a flywheel due to pedaling of an operator, so as to make the permanent-magnet synchronous motor operating in a generator mode, in a second operation mode, the interlock switch makes the motor driving circuit and the permanent-magnet synchronous motor closed-circuiting and cutting off control of the resistance controller, and electrical energy is supplied from the power supply circuit to the permanent-magnet synchronous motor, so as to make the permanent-magnet synchronous motor operating in a motor mode to induce an acceleration on the external rotor.