Managing EMI (Interference) - hoantv/CarSimulatorFirmware GitHub Wiki

EMI (electro-magnetic interference) is a challenge that has to be overcome by some trial and error. Your mileage may vary. The main source of EMI in this build is the servo motor power cable (the power cable that carries power from the servo drive to the servo motor).

Here are some steps you can follow to manage EMI in your setup:

  1. Install an EMI filter on the AC input cable.
  2. Isolate servo driver with STM32 developemnt kit (VNM FFB Board already has this features).
  3. Install a ferrite bead around the U, V and W cables (not Earth) of the motor power cable close to connection to the servo drive.
  4. Run your signal cables (servo driver cable, USB cables) as far as possible from the motor power cable (the main source of EMI).
  5. Use high quality micro USB cables for all connections in your rig.
  6. Run the steps below for setting up your servo drive correctly if you use AASD servo driver. Reference voltage (see Fn007 below) needs to be properly setup once your rig has been wired up and all EMI management parts have been installed (Mige driver has low interference, so dont need this step)
  7. Finally, once all is setup and working, reset your PC's PSU to reestablish its reference voltage. You may experience instability in your PC as it too will be affected by the EMI. To reset the PSU, switch off the PC, unplug everything (including the power cable), press the power button for 15 seconds, plug in the power cable, switch on the PC to check that it starts, switch off, plug everything in again, and switch on.