# Stepper Motor: The difference between 2 phase motor and 3 phase motor **URL:** \ **Category:** Motor Drive\ **Created:** [May 18, 2021, 3:18am UTC](https://forum.cloudray.com/t/stepper-motor-the-difference-between-2-phase-motor-and-3-phase-motor/338 "2021-05-18T03:18:39Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)\ **Post date:** [May 18, 2021, 3:18am UTC](https://forum.cloudray.com/t/stepper-motor-the-difference-between-2-phase-motor-and-3-phase-motor/338/1 "2021-05-18T03:18:39Z")
What is the difference between a two-phase stepper motor and a stepper motor? 1. The number of motor phases refers to the number of coils inside the motor. A two-phase stepper motor consists of 2 coils, while a stepper motor consists of 3 coils. 2. The step angle of the motor refers to the angle of each step of the motor. Generally, the step angle of the two-phase motor on the market is 0.9°/1.8°, and the usual 0.75°/1.5°. 3. The size of the motor The 3-phase motor is generally a large motor, so the size is generally larger than the two-phase motor, which also determines that the gradual advancement of the motor is more stable than the two-phase motor. 4. PWM The harmonics of the two-phase motor will have the same size and slightly larger than the average value. 5. Precision The subdivision function of the two-phase stepper motor driver is becoming more and more powerful, and the two-phase can also achieve the accuracy that the spindle can achieve. The high-speed performance of the primary stepping motor is good (the characteristics are harder), and the step angle is smaller than the two-phase stepping motor, and the accuracy is better. Since the torque decreases slowly with the increase of speed, it is usually used in occasions with high accuracy requirements.