Stepper motor is a kind of electric pulse into angular displacement of the actuator, stepper motor classification can be divided into three types: permanent magnet (PM), reaction (VR) and hybrid (HB) The permanent magnet stepper is generally two-phase, the torque and volume are small, and the stepping Angle is generally 7.5 degrees or 15 degrees. The reactive step is generally three-phase, which can achieve large torque output, and the step Angle is generally 1.5 degrees, but the noise and vibration are very large. In Europe and the United States and other developed countries have been eliminated in the 1980s; Hybrid stepper refers to a combination of the advantages of permanent magnet and reactive. It is divided into two phases and five phases: the two-phase step Angle is generally 1.8 degrees, the three-phase step Angle is generally 1.2 degrees, and the five-phase step Angle is generally 0.72 degrees. This kind of stepper motor is the most widely used.
