Experiment and analysis of high power line-start PM motor

This paper investigates the performance of a high power line-start permanent-magnet motor (LSPM) by experiment, which is developed for industrial fans, pumps and compressors to reduce the energy consumption. The no-load back-EMF is measured and compared with predicted result of FEM. In order to assess the line starting ability, the rotor-locked test is carried out and then the starting torque ratio is deduced which is lower than that of induction motor of the same power. By adjusting the load, the efficiency and power factor during all operation condition are obtained. It is found this proposed LSPM has not only higher power factor and efficiency, but also high overload ability. After its starting ability of reduced voltage is analyzed, several useful methods are pointed out for designing high power LSPM which should start with limited current. Streszczenie. Zbadano wlaściwości silnika wysokiej mocy LSPM w zastosowaniu przemyslowym do pomp, wentylatorow i kompresorow pod kątem redukcji zuzycia energii. Zbadano silnik przy zablokowanym wirniku i na tej podstawie przewidywano moment startowy. Przy zmianie obciązenia określono wspolczynnik mocy i sprawnośc. (Eksperyment i analiza silnika duzej mocy o rozruchu bezpośrednim typu LSPM)

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