Position Error Suppression Method for SynRM Drives Based on Reduced-Order Flux Observer

Because of the special structure of synchronous reluctance motor (SynRM), the cross-coupling effect is severe. Aiming at reducing the position estimation error for low speed sensorless SynRM drives caused by the cross-coupling effect, a flux compensation method considering the stator mutual inductance is implemented on a reduced-order flux observer. After the stability and parameter analysis, the mutual inductance compensation method is proved to effectively reduce the flux estimation error, and consequently reduce the position estimation error of the flux observer. The proposed method was verified on a 3-kW SynRM drive platform, whose position estimation error is much less than the traditional observer.