Double-salient-pole permanent magnet linear motor and motor module group using same

The invention relates to an internal heat radiation composite magnetic flux switching permanent magnet motor including two stators, two rotors, armature windings, permanent magnets, a magnet insulation ring, and radiating holes. In one aspect, internal and external rotors don't have permanent magnets and any excitation windings, so that the motor has the characteristic of firm structure; and in another aspect, the two rotors are provided with the permanent magnets and the armature windings and are connected through the magnet insulation ring, and the heat of the motor can be radiated from the inside through the radiating holes. A permanent magnet magnetic flux switching motor is kept in structure, the advantages of good robustness and high speed running can be achieved. The heat radiation of the side of the motor can be realized without additionally increasing the size of the motor, so that the motor can be high in reliability and good in overloading capability, and is suitable for the conditions requiring small size and high reliability and having bad heat radiation.