Question

What is the difference between open-loop and closed-loop stepper motors?

Comments

What is the primary difference between closed-loop and open-loop motor control?

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What is the difference between an open-loop stepper motor and a closed-loop stepper motor?

Answer 1

The differences between open-loop stepper motors and closed-loop stepper motors are as follows:

1. Whether there is feedback. Open-loop stepper motors have no feedback, closed-loop stepper motors have feedback.

2. Control mode. The open-loop stepper motor is executed sequentially, and the closed-loop stepper motor takes corresponding action measures or signal feedback to the PLC according to the signal feedback, and the PLC decides the next step of program processing.

3. Output impact. The output of the open-loop control system has no effect on the control effect, and the output of the closed-loop control system has a direct impact on the control effect.

4. Completion time. Open-loop control is generally a control activity that is completed instantaneously, and closed-loop control must last for a certain period of time.

Answer 2

Open-loop and closed-loop stepper motors have the following differences:

Closed-loop stepper motors add encoders, while closed-loop drives and closed-loop stepper motors need to be used as a set.

The positioning accuracy of closed-loop stepper motors is the same as that of open-loop stepper motors.

The closed-loop stepper motor can adjust the winding current according to the load, thereby reducing the temperature rise of the motor and improving the efficiency of the system.

Closed-loop stepper motors can consider small or even no margin when selecting the motor load torque, while open-loop stepper motors generally retain 30% of the torque margin to prevent stalling.