Abstract: stepper motor in the actual application of the operation mode is not fixed, there are mainly three kinds of operation mode, respectively for the motor running, generator operation, compensation machine operation of the three operation modes, the applications of three kinds of operation mode has certain difference. This paper is to introduce the three operation mode of the stepper motor. The running of step motor, the motor function is more, it can be used as a generator to run, this operation mode is also a kind of operation mode of the step motor is the most important. Small step motor is applied in the variable frequency speed regulation system, big step into the machine can be used in the request for the control of motor speed, it will be very helpful for the improvement of operation efficiency. Two step machine, generators run the second mode of operation is the generator operation, it is also the one of the most main operation mode, and in this kind of operation mode also has the very good operating efficiency and applications. Three, compensation machine running the third operation mode of the stepper motor is to compensate the machine running, general is applied in the power grid, the operation of motor don't need to take any mechanical load, it is mainly used to adjust or improve the power factor of power grid voltage, the realization of the function mainly through the adjustment of rotor exciting current flow to the power grid from the perceptual. 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: