AS5047P Encoder Noise Due to Electromagnetic Interference

This is the most frequent cause of noise in SPI-based encoder systems. Confirm this by performing an isolation test: disconnect the motor phase wires from the VESC and run the encoder detection wizard again. If the noise disappears or the SPI fault logs cease while the motor is unpowered, the signal degradation is confirmed to be induced EMI from the motor phase wires running parallel to the encoder signal cable.