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This paper describes the influence of magnetic saturation on sensorless control for interior permanent magnet synchronous motors (IPMSM). A novel sensorless control algorithm for IPMSM using 3-phase high frequency voltage input is proposed. Rotor position is estimated by simple integration procedure independently of motor parameters. Taking magnetic saturation into consideration, local inductance is directly calculated by finite element method. Calculated inductance well agrees with experimental value and the influence of magnetic saturation on motor inductance value is evaluated. It is shown that magnetic saturation causes large estimation angle error of sensorless control for IPMSM, and a method that reduces estimation angle error is proposed. The validity of proposed method is confirmed by experimental results.

Influence of Magnetic Saturation on 3-phase High Frequency Voltage Input Sensorless Control for IPMSM