Solution to stepper motor interference problem

In many cases, because the current and voltage of the stepper motor are relatively high, for example, some stepper motors have a maximum output current of 8A and a voltage of 325V, and their casing is not made of aluminum alloy for magnetic shielding, it interferes with the high-sensitivity receiver system, making it unable to work, and interferes with the power supply, especially at high frequencies. It may cause the control system's microcontroller and host computer to be unable to communicate normally, and in severe cases, cause the microcontroller to crash, causing difficulties for normal use. Therefore, the interference problem must be solved.

1. Install a power filter to reduce pollution to the AC power supply.

2. "One-point grounding" principle. Connect the ground of the power filter, the driver PE (ground) (the driver is insulated from the chassis bottom plate), the lead wires of the control pulse PULSE- and the direction pulse DIR- after short-circuiting, the motor ground wire, the cable protective cover between the stepper driver and the motor, and the driver shield wire to the grounding column on the chassis wall, and ensure good contact.

3. Try to increase the distance between the control line and the power line (L, N) and the motor drive line (U, V, W) to avoid crossing. For example, when we install two drivers in the same chassis in a dual-axis drive system, one driver nameplate faces forward and the other faces backward, and the structural layout makes these leads as short as possible.

4. Use shielded cables to reduce interference from the outside world to yourself, or from yourself (power cables) to the outside world.