Woodworking engraving machine stepper motor driver interference solution - Database & Sql Blog Articles

Single chip microcomputer STM32L151CCU6

Filter 18.432M

Because the general stepper motor driver housing is not magnetically shielded by aluminum, titanium or magnesium alloy casings, it interferes with the highly sensitive receiver system, making it inoperable and contaminating the power supply, resulting in the control system's microcontroller and upper position. The machine can't communicate, and the serious one causes the MCU to crash, which makes it difficult for normal use, so the interference problem must be solved.

The following measures can be taken to solve:

A. Install a power filter to reduce contamination of the AC power.

B. "One point to ground" principle. The ground of the power filter, the driver PE (ground) (the driver is insulated from the chassis bottom), the control pulse PULSE- and the direction pulse DIR- shorted the lead wire, the motor ground wire, the cable cover between the driver and the motor, the driver The shielded wires are connected to the grounding post on the wall of the chassis and require good contact.

C. 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 crossover. For example, we are dealing with two drive installations in the same chassis in a two-axis drive system. In position, one drive nameplate faces forward and the other faces backwards, and the construction is arranged to keep these leads as short as possible.

D. Use shielded wires to reduce external interference to yourself or interference from the outside world (power cord).

After the above processing, the system works reliably.