Influence of line based and space vector hysteresis control processes on PMSM in electric vehicles

A drive train system (DTS) powered by a battery and driving a permanent magnet synchronous motor (PMSM) is discussed in this paper. A two-level, three-phase conventional inverter with no harmonic filters on both AC and DC sides is used as means of power conditioning. This DTS is modelled as a double oscillator according to the mechanical part in an electric vehicle. Two inverter modulation schemes are applied, namely, a single phase hysteresis scheme and space vector based hysteresis scheme with non rotating hysteresis shape. Both pulsing methods are non-deterministic and include a current controller in their structure. The influence of these modulation schemes on the performance of the DTS is determined by assessing the level of inverter generated harmonics flowing to the PMSM (electrical part) and to the tyres (mechanical part). The simulated results presented in the paper indicate that the absence of filters can be partly retained by a dispersion of the harmonic energy of the inverter generated spectrum due to high frequency switching. This can be achieved in a better way by using a the space vector based hysteresis control scheme.