Study of Generator Mode on Permanent Magnet Synchronous Motor (PMSM) for Application on Elevator Energy Regenerative Unit (EERU)

This article presents the operating principle of transformation from permanent magnet synchronous motor (PMSM) to function as Generator in Energy regenerative mode. From experiment it is observed that when voltage is fed into permanent magnet motor, the electric input energy is converted to mechanical energy. On the other way, when motor is rotated without supplying input power while no load or light load, it generated electric output energy. This situation is call “Regenerative”. Therefore this electric output energy can be fed back to the system for replacement of the energy that has been used. The study is done by simulation using Matlab/simulink program. The simulation used closed loop control, PMSM is running at 1000 RPM, controlled by PI controller through an inverter with PWM controller switching waveform from insulated gate bipolar transistor: (IGBT). The characteristic of motor is observed while feeding both positive and negative load. When it is fed with positive load it behaves as motor and with negative load it suddenly behaves as generator. This experiment will lead to a proper design of Elevator Energy Regenerative Unit (EERU) applications.