Three-phase four-switch inverter fed IPMSM initial position estimation based on HF method

Position sensor and switching device faults usually occur in an interior permanent magnet synchronous motor (IPMSM) drive system. To increase reliability of such a system, it is important to study its fault-tolerant operation. This paper proposes an initial position estimation scheme for an IPMSM drive system. The sensorless control strategy is based on the high frequency (HF) injection method, which is suitable for stand-still and low speed operations. The inverter applied in the system has a three-phase four-switch (TPFS) configuration. This method is attractive for fault tolerant operations. Simulation results show the effectiveness of the proposed system.

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