1.Working principle and characteristics of servo motor

A servo motor is a motor that can achieve precise positioning and control. It senses the feedback signal, compares the output parameters such as motor speed, angle or position with the input command, and corrects the difference to keep the output parameters stable and accurate.
The control method of servo motor generally adopts PID controller. PID control is a proportional-integral-differential control. By adjusting three parameters, the motor output parameters can be controlled quickly and accurately. Servo motors have the characteristics of precise positioning, fast response, high impedance, low stall, etc., and are widely used in automation, industry, robotics and other fields.

2.Working principle and characteristics of closed-loop stepper motor

A closed-loop stepper motor is a control method that combines stepper motors and servo motors. It uses encoders or Hall sensors to feedback the motor position and communicate with the controller to achieve precise positioning and control.
The control method of closed-loop stepper motors also adopts PID controller. Compared with servo motors, the control accuracy of closed-loop stepper motors is relatively low, but it can achieve control effects similar to servo motors at a lower cost.
Closed-loop stepper motors have the characteristics of low noise, small vibration, suitable for low load, high precision applications, etc., and are widely used in semiconductor, medical, aerospace and other fields.

3.The difference between servo motors and closed-loop stepper motors

1.Working principle: servo motors are controlled according to feedback signals, and closed-loop stepper motors are controlled through positioning information.
2.Control method: servo motors and closed-loop stepper motors use the same PID control method.
3.Features: servo motors have the characteristics of high precision, high impedance, low stall, etc., suitable for precision control fields; closed-loop stepper motors have low noise, small vibration, suitable for low load, high precision control fields.

4.Conclusion

In general, although servo motors and closed-loop stepper motors have different working principles and characteristics, they are both motors that realize precision control, with different application fields and advantages and disadvantages. Choosing a suitable motor according to actual needs can maximize its advantages and functions.