Abstract
In this paper, a driving method for an interior permanent magnet (IPM) motor is proposed; this method increases the system efficiency in the constant power region. In the driving method, the PWM inverter with a voltage booster system allows the use of both flux weakening control (FWC) and DC link voltage control (DVC) to drive an IPM motor at high speed. The authors investigate how a combination of FWC and DVC is suitable for the system. First, a simulation model is introduced. This model allows the calculation of the system efficiency and each part of the system losses in the voltage booster, inverter, and IPM motor. Furthermore, the system efficiency is calculated using the simulation model, and the simulation results are discussed when the ratio between the FWC and the DVC is changed. The IPM motor drive method is expected to help achievement of high efficiency by adjusting the ratio between the two control methods in the constant power region.
