Since permanent-magnet synchronous machines (PMSMs) have numerous advantages over other electric machines, many of the motor drive applications have been changing their power sources from conventional adjustable speed drives like induction motors to the PMSMs. The most attractive points of the PMSMs are high efficiency and high power density. In the case of interior permanent-magnet synchronous machines (IPMSMs), extra benefits are added to those of surface permanent-magnet synchronous machines (SPMSMs), i.e. field-weakening operation capability, higher torque output owing to the reluctance torque, robust structure allowed by embedded permanent-magnets in the rotor, etc. Therefore, the IPMSMs have recently attracted a great deal of attention from researchers, scientists, and engineers in academia and industry in Japan.This survey paper introduces the latest technical trends of the PMSM drive technologies in Japan, which are cited from the following IEE-Japan transactions on Industry Applications (Japanese editions).
References(1) Sato M, Doki S, Ishida M. High-Frequency Equivalent Circuit of PM Synchronous Motor Driven by PWM Inverter.