抄録
Due to the public growing concern about the environmental problems, each country in the globe is setting a specific target for the energy consumption cut down in each field. As response to the fact, the air conditioning companies are serving many types of energy efficiency including the PM motor driven compressor machines. Within these motors, the internal buried permanent magnet type(IPM) which is known by its high efficiency due to the use of the added reluctance torque to the normal PM one. In this paper, the maximum phase current efficiency is clarified from the motor equivalent circuit and confirmed by experiment. It is also shown that the IPM driving efficiency is higher than the conventional PM one. The simplicity of the current control method is presented and the lowering capacities efficiency from the maximum one is verified and the difference is acceptable. Furthermore, the motor steady characteristics and their independence from the rotating speed is pointed out. Finally. It is clarified that the sinewave driven motor has a higher efficiency than the 120 degree rectangular wave driven one.
