Sensorless position control of permanent magnet synchronous machines without limitation at zero speed

摘要: Sensorless position control of surface mounted permanent magnet synchronous machines (SMPMSM) still is a challenge. High performance at low and zero speed only possible using anisotropic effects being considered not in the fundamental-frequency machine models, but extended high-frequency models. This paper presents new injection method estimating rotor position, which overcomes small signal to noise ratio inherent methods this type published so far. enables track even saliencies typical for SMPM machines. A voltage injected into d-axis with no influence on torque producing q-current. The demodulation responding current independent parameters. Therefore proposed parameters simply adaptable different As high frequency has be processed estimation, there additional hardware necessary besides that standard drives field oriented control.