The difference between open-loop stepper motor and closed-loop stepper motor
Release Date：2023-08-11
Author：LEESN
Open-loop stepper motor and closed-loop stepper motor are two common control modes in the field of stepper motor, and they have significant differences in control mode, performance characteristics and application scenarios. The following will be a detailed comparative analysis of the open-loop stepper motor and the closed-loop stepper motor. Open loop stepper motor: Open-loop stepper motor is a simple stepper motor control mode, which is usually used in some applications with low control accuracy requirements. In the open-loop stepper motor system, the controller drives the motor according to the set step pulse signal, but the system can not get the actual position and state information of the motor in real time. This may cause the motor to be out of step under certain circumstances, such as load changes or external interference, resulting in position errors. Closed-loop stepper motor: The closed-loop stepper motor is developed on the basis of the open-loop stepper motor, and it adds a feedback system to monitor the position information of the motor in real time to ensure higher control accuracy and stability. The closed-loop stepper motor system obtains the actual position of the motor through the feedback device such as the encoder, and passes the information to the controller, and the controller adjusts and corrects the actual position information to achieve more accurate position control. Differences and features: Control accuracy: Open-loop stepper motor: The control accuracy is relatively low, which may be affected by stepping Angle error and out-of-step phenomenon. Closed-loop stepper motor: Through real-time feedback, higher control accuracy can be achieved, reducing position deviation and out-of-step problems. Stability: Open-loop stepper motor: Due to the lack of real-time feedback, the system stability is poor, and it may be out of step in the case of load changes. Closed-loop stepper motor: through real-time feedback and correction, it has better stability and can maintain stable movement in changing environments. Application scenario: Open loop stepper motor: suitable for some applications that do not require high control accuracy, such as simple positioning, switch control, etc. Closed-loop stepper motors: Suitable for applications requiring high precision positioning, stability and control accuracy, such as medical equipment, precision instruments, automated production lines, etc. Cost: Open loop stepper motor: Because no real-time feedback device is required, the cost is relatively low. Closed-loop stepper motor: High cost due to the need for feedback devices such as encoders. In summary, there are obvious differences between open-loop stepper motor and closed-loop stepper motor in control accuracy, stability, application scenario and cost. The selection of the appropriate type of stepper motor should consider the needs and performance requirements of the specific application in order to achieve the best motion control effect.
