An Improved Sideband Current Harmonic Model of Interior PMSM Drive by Considering Magnetic Saturation and Cross-Coupling Effects

Abstract

The sideband current harmonics, as parasitic characteristics in permanent magnet synchronous machine drives with space vector pulsewidth modulation technique, will increase the corresponding electromagnetic loss, torque ripple, vibration, and acoustic noises. Therefore, fast yet accurate evaluation of the resultant sideband current harmonic components is of particular importance during the design stage of the drive system. However, the inevitable magnetic saturation and cross-coupling effects in interior permanent magnet synchronous machine drives would have a significant impact on the current components, while the existing analytical sideband current harmonic model neglects those effects. This paper introduces a significant improvement on the analytical model by taking into account these effects with corresponding nonlinear factors. Experimental results are carried out to underpin the accuracy improvements of the predictions from the proposed model over the existing analytical one. The proposed model can offer a very detailed and insightful revelation of impacts of the magnetic saturation and cross-coupling effects on the corresponding sideband current harmonics.

A Proposed Approach for Separation between Short Circuit Fault, Magnetic Saturation Phenomenon and Supply Unbalance in Permanent Magnet Synchronous Motor

“…Therefore, the magnetic induction is beyond the saturation bend. This increase in current is caused either by an increase in the supply voltage or by an ITSC fault [23][24][25]. To detect the MSP, a problem arises because many studies have proven that the MSP indicators manifest themselves in the same signatures as those of the ITSC fault [23][24][25].…”

Investigation of Magnetic Field Interharmonics and Sideband Vibration in the FSCW IPMSM Drive With the SPWM Technique

“…The existing studies on such high-frequency characteristics are mainly devoted to induction machine drive systems [19]- [21]. Not until quite recently have there been particular investigations on full direct analytical derivations of sideband vibration [22] at PMSM drive systems with the space-vector pulse width modulation (SVPWM) technique, based on the analytical sideband current model [23], [24]. The discussion is only confined to integral-slot configuration, and the method cannot be directly extended to cover FSCW configuration [22].…”

Analytical Investigation of Sideband Electromagnetic Vibration in Integral-Slot PMSM Drive With SVPWM Technique

“…The prototype PMSM with interior PM configuration will be in severe magnetic saturation under some extremely heavy load conditions. The magnetic saturation will reduce the inductances values and introduce cross-coupling effect and hence increase the sideband current harmonics significantly [30]. However, the relevant parameters σ 1 and σ 2 given in (30) are almost immune to load and magnetic saturation for integralslot PMSM.…”

“…The magnetic saturation will reduce the inductances values and introduce cross-coupling effect and hence increase the sideband current harmonics significantly [30]. However, the relevant parameters σ 1 and σ 2 given in (30) are almost immune to load and magnetic saturation for integralslot PMSM. Therefore, the impact of magnetic saturation on the sideband radial electromagnetic force density components is very trivial and negligible.…”