Stepper motor stepper motor is a very good digital actuators, in level control of CNC system, use stepper motor as drive motor. Stepper motor speed normally after 700 turn function drops, sometimes, the speed of the stepper motor or stepper motor caton may throw step, clear, if we meet how to deal with this problem? Below to introduce the stepper motor under caton what's going on. First, the parameters of the motor changes (For example: 57 stepper motor resistance = 0. 5 oh, inductance = 0. 8 mh, if want to progress the function, we can be the resistance of the stepper motor inductance are corresponding decreases, and that will improve speed and high torque)。 Second, to be able to progress step by step drive power supply voltage, due to such high speed high voltage commutation current available at the time of the magnetic field of progress. If the ac power source and step into the drive dc bus (Such as transformer)No isolation between words, do not use the dc bus of the isolated port or E signal to pick up the earth, and this may lead to equipment damage and injuries. Due to the communication of public power, pressure is not on the earth, to the dc bus may be between the earth and has a high voltage. 1, in most of the high pressure stepping drive system, everything is on the tip of the public and the earth in signal meet together. A variety of connecting the earth method of circuit is very simple affected by noise and flow in different reference point. 2, in order to adhere to the instructions refer to voltage stability, to step into the drive signal of received signal to control device. It will also receive the external power supply, this will affect the manipulation of the device and stepper motor drives the homework. 3, shield grounding is relatively difficult, there are several ways. Correct shielding meet is located in refer to the potential point is inside of the circuit. This point take safety ground at the same time, whether the noise source and acceptance may be empty. To ensure that the current in the same point grounding makes the shield will not through the shield. In the open loop control, step motor by a certain frequency of pulse control. Pulse occurred directly by the PLC to control stepping motor can effectively simplify the hardware circuit of system reliability further progress. Because of PLC based on circular scanning methods work, its scan cycle generally within a few milliseconds to a few milliseconds, which is limited by a method of PLC and scan cycle, the influence of step motor cannot work under high frequency.
