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Differences between two-phase stepper motors and three-phase stepper motors

August 11, 2023

 Differences between two-phase stepper motors and three-phase stepper motors

1. Number of phases of the motor

The number of coils inside the motor varies, resulting in different phases of the motor. A two-phase stepper motor consists of two coils inside, while a three-phase stepper motor consists of three coils inside.

2. Step angle of the motor

The step angle refers to the angle taken by a pulse motor. Currently, the step angle of two-phase stepper motors on the market is generally 0.9 °/1.8 °, and that of three-phase motors is 0.6 °/1.2 °.

3. Dimensions of the motor

A three-phase stepper motor is usually a large motor, so in terms of scale, it is generally larger than a two-phase stepper motor, which forms the inherent advantages of three-phase stepper motors, which are smaller torque fluctuations and smoother operation. There is also a drawback, which is that the size is larger than that of the two phases, and the application site is very limited. Therefore, the most common typical application in the field of stage lighting is that spotlights need to move quickly and operate quietly without affecting performance.

4. Torque

The torque of a two-phase stepper motor with the same scale will be slightly larger than that of a three-phase motor.

5. Accuracy

Due to the different number of phases, the corresponding stepper drivers are also different. The subdivision functions of two-phase stepper motor drivers are becoming more and more refined. However, through design improvements, the stepper motor has made this difference very small. Both phases can also achieve the accuracy that three-phase can achieve, and the torque in the high-speed section is also very close.

The high-speed performance of three-phase stepper motors is good (with hard characteristics), and the step angle is smaller and the accuracy is better than that of two-phase stepper motors. Because the torque decreases slowly with increasing speed, it is generally used in situations with high precision requirements.



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