| Abstract |
To suppress the position error harmonic ripples in back electromotive force (EMF) based methods for position sensorless interior permanent magnet synchronous motor (IPSMSM) drives, asecond-order generalized integrator (SOGI) basedharmonic self-compensated sliding-mode observer (SMO) is proposed. The inverter nonlinearities and flux spatial harmonics that induce the position error harmonic ripples are analyzed. The back-EMF information containing harmonics can be obtained through SMO, and then the SOGI based cross-feedback network is adopted to realize back-EMF harmonic detecting and self-compensating, thus eliminating the position error harmonic ripples. Due to the simple structure, the SOGI based harmonic self-compensated SMO can be easily implemented on low-cost microchips with little computational burden. Experiments on a 2.2kW IPMSM sensorless vector control drive have been carried out to verify the proposed scheme. |
