Abstract: stepper motor according to the different excitation mode, can also be divided into permanent magnet stepper motor, the motor is not exciting step motor, it can be used for single-phase power supply, also can be used on the multiphase power supply. In this paper, from the following several aspects to meet permanent magnet stepper motor. A, the structure is very important in permanent magnet stepper motor work structure is: the squirrel cage rotor and stator windings. Electronic winding of the motor is very similar with multiphase motor stator, squirrel cage rotor is salient pole rotor, cut into flat surface, the magnetic pole is made of magnetized steel the material, can guarantee the rotor has a long magnetic. Second, the working principle of permanent magnet stepper motor of squirrel-cage winding part plays a vital role in their work, is to generate the rev torque, in the work, when the stepper motor rotate at a certain speed, the frequency of stator winding current and the salient pole rotor is step by step. Stator higher number and the number of salient pole is the same, once the stepper motor rotation to normal speed, winding would no longer work. The rotor speed and rotating magnetic field step by step because of rotor and magnetic pole with stator poles. The above content simple introduction about the structure and working principle of permanent magnet stepper motor, it is a kind of has a very good application effect has been widely applied and a motor. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone: