Why does a stepper motor not require an encoder?

1. Compared to servo motors, stepper motors have certain price advantages due to cost factors. If equipped with an encoder, it will further increase the cost. In some applications with low precision requirements, using a stepper motor without an encoder can reduce costs.
2. Although encoders can improve control accuracy, the control accuracy of stepper motors themselves is sufficient to meet the needs of many applications. Although equipping an encoder can improve accuracy, it is not necessary for some applications that do not require high precision.
3. The use of reliability encoders may increase the complexity of the system, thereby reducing reliability. Without an encoder, the reliability of the system will be higher.
4. In certain specific application scenarios, such as those requiring fast response and high acceleration, stepper motors exhibit better performance. In these cases, equipping an encoder may not be the best choice.

Stepper motors can achieve rotor positioning control by controlling the winding current. Therefore, in most applications of stepper motors, the position control of the motor can be achieved without the need for an encoder. However, due to open-loop control, the positioning accuracy may be lower without an encoder. Generally, the positioning accuracy is based on the step angle positioning of the stepper motor.