Speed ​​control method of electronic universal test machine

Electronic universal testing machineThe speed control principle is basically similar to the displacement control principle. The upper computer sends speed commands to the motor control card through software, and then the motor control card generates the corresponding pulse frequency and pulse frequency change rate according to the command. The pulse frequency corresponds to the rotation speed of the motor. After the driver receives the pulse signal, it can generate a pulse driving signal to control the rotation of the motor. In order to reduce production costs, some manufacturers do not use speed feedback units to perform closed-loop control of the motor speed, but only use the speed characteristics of the stepper motor itself. Such a speed opening method inevitably causes inaccurate speed control and certain deviations.

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