Evaluation of different mitigation techniques for electromagnetic interference caused by common mode voltage in BLDC outer-rotor motor

The paper deals with some mitigation techniques of parasitic phenomenon in modern electric motors supplied by inverters. These techniques are commonly divided into two groups, namely modifications of inverter and modification of motor. The shaft voltage was found as a source of electromagnetic interference. Investigated mitigation techniques applied on outer rotor permanent magnet motors were: increased distance between stator end-windings and disc, faraday shield between stator end-windings and the housing, grounded shaft and electrical insulation between the rotor and the shaft. Effectiveness of analyzed techniques was tested on 6.5kW and 10kW brushless direct current motor.