Concerning efficacy, the present invention possesses the advantage of motor driving, and the permanent-magnet synchronous motor of the present invention, when operating in a generator mode, possesses excellently smoothening variation of a magnitude of a resisting force. Further, the work that the operator makes during a riding exercise may be charged backward for storage of energy.

Further, when the permanent-magnet synchronous motor of the present invention in operating in the generator mode, the resistance system includes an arrangement of an electromagnetic resistance generation device arranged on a periphery of the external rotor of the permanent-magnet synchronous motor in operation, and the electromagnetic field intensity of the electromagnetic resistance generation device causes a damping effect on the rotor, without causing mutual interference with an internal structure of the permanent-magnet synchronous motor, including the stator windings and the permanent-magnet external rotor.

The present invention provides the following advantages:

• • (1) The permanent-magnet synchronous motor driving and resistance control system of the present invention is provided so as to include, for stator windings, winding for motor driving, and also a winding for electricity generation by a generator to provide electrical energy to the resistance system.