Investigation of calculation method of losses in PWM inverter with voltage booster using both DC link voltage Control and flux weakening control

In this paper, authors investigate calculation method of losses in system which consists of interior permanent magnet (IPM) motor and PWM inverter with voltage booster. This system has two driving methods for motor in high speed region. One is DC link voltage Control. The other is flux weakening control. However, it is not cleared how combination of these two control methods is suitable for this system. It is necessary to quantitatively estimate parts of system losses in voltage booster, inverter and IPM motor, because total efficiency of system is decided by parts of system losses. So, the simulation model, which is capable of calculating parts of system losses to find suitable driving method for IPM motor using combination of the two control methods, is introduced and simulation results are discussed.