Sadayoshi Hibino

High-efficiency drive due to power factor control of a permanent magnet synchronous motor

A drive system for a permanent magnet motor without a magnetic position detector is described. Generally, the position data of a magnet are obtained from the terminal voltage of the motor. In the newly developed method, the inverter DC-link current waveform provides the control signal for driving without a detector. Since the power factor of the motor is controlled at around 1.0, the motor runs at a higher efficiency than that of the conventional method. Therefore, this control method saves energy. Current pulsation induced by sudden load fluctuations has been studied, and its stabilization has been achieved. The principle and operation of the method, simulated characteristics, and experimental results are presented.<<ETX>>

APPLICATION OF 6.5% SILICON STEEL SHEET TO INDUCTION MOTOR AND ITS MAGNETIC PROPERTIES

ABSTRACT The practical application of recently developed standpoints 6.5% Si steel sheets in electrical machines is discussed from two standpoints. One is application in high-speed induction motors and the other is inverter-fed induction motors. The latter had good results in reducing noise and economy, and a practical iron core was developed.