Stepper motor is a kind of discrete motion device. It has close connection with modern digital control technology. In the current domestic digital control system, stepper motor is widely used. However, the traditional stepper motor control method is open-loop control, the starting frequency is too high or the load is too large, prone to lost or blocked the phenomenon of rotation, stop over high speed is easy to overshoot phenomenon, in order to ensure the control accuracy , should handle the problem of rising and falling speed. For step loss or loss of control in stepper motor control, a magnetic grid displacement sensor is used as a position detection device to detect the displacement of the stepper motor, and the displacement signal is converted into a pulse signal feedback to the PLC to achieve closed-loop control, so that the stepping motor The control performance achieves the same control effect as the AC servo motor while reducing the cost of the control system.
In the stepper motor control system, a magnetic grid displacement sensor is introduced as a feedback unit, which solves the problem of lost or out of control common in the open loop control of the conventional stepper motor, and improves the control accuracy of the stepper motor. The scheme has been applied to the developed smart circuit breaker intelligent test system and achieved good control results in the field.
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