The reasons are as follows: it may be a problem of interference, the servo motor is driven by pulse drive, in the ground or no photoelectric isolation processing circuit, the first power will bring pulse signal, thus driving the servo motor. There are many ways to deal with it, and reliable lines and boards are the most critical. Secondly, an on-off signal can be added to the enable signal of the motor, that is, 24VDC is added to the drive when electric mobility is required, and the rest of the case is not added. So it won't move. Servo motor refers to the engine that controls the operation of mechanical components in the servo system, which is a supplementary motor indirect transmission device. The servo motor can control the speed, the position accuracy is very accurate, and the voltage signal can be converted into torque and speed to drive the control object. Servo motor rotor speed is controlled by the input signal, and can react quickly, in the automatic control system, used as an executive component, and has the characteristics of small electromechanical time constant, high linearity, starting voltage, etc., can convert the received electrical signal into the angular displacement or angular speed output on the motor shaft. Divided into DC and AC servomotor two categories, its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the speed decreases with the increase of torque.
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Due to the lack of torque caused by inappropriate selection, there is not enough margin, resulting in the sudden increase of external forces such as friction in the mechanical part, and the stepper motor is out of step due to the lack of servo motor torque.
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Because the acceleration and deceleration of the control is too steep, or there is no acceleration and deceleration, the loss of step is caused by interference, such as the line between the controller and the driver is too long, the line from the driver to the motor is too long, or there is a strong interference source, or the switching power supply
Out-of-step means that the servo motor controller sends out N pulses, but the servo motor does not perform N steps, and some pulses are lost.
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Overshoot is the motor from motion to stop, or from high speed to low speed, due to too much or no deceleration, resulting in the stepper motor did not stop in time and caused by loss of position.
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The out-of-step of the servo motor is very frequent in the early stage, the main reason is that the drive technology is not mature enough, the pulse sent by the upper computer, the servo motor drive can not be fully received or can not be fully processed into an electrical pulse to the servo motor.
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With the improvement of the computing power of the driver chip, the improvement of the performance and speed of the optical coupling, and the enhancement of the anti-interference ability of the driver, this kind of out-of-step caused by the performance and quality of the driver almost does not exist.
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The overshoot of the servo motor is often caused by inappropriate selection or failure to do a good job of acceleration and deceleration.
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The out-of-step seriously affects the stability and control accuracy of CNC system, resulting in the decline of machining accuracy. Therefore, it is very important to ensure that the motor does not occur out of step.