Abstract
The paper presents a sensorless control technique for the low-speed region. The method is based on tracking of the six-phase permanent magnet synchronous machine (PMSM) saliencies with high-frequency (HF) signal injection. The six-phase system is an effective fault-tolerant propulsion for transport vehicles where the sensorless control can be utilized as the speed/position sensor backup. The machine has negligible geometrical saliencies, so the magnetic salience is excited utilizing the flux-producing component of the field-oriented control. The possibilities of HF injection and the demodulation processes for the whole six-phase system and one of the three-phase systems are examined. The sensorless control technique is verified experimentally on the six-phase PMSM with 30° displacement between two three-phase windings and the power of 1 kW.
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