Sensorless control for surface mounted PM machine with a high inertial load

PM machine or Permanent magnet synchronous motor (PMSM) is a nonlinear system with multivariable couplings. To achieve the sensorless control of a PMSM with high inertial load, a modified current observer, using PI regulator instead of sliding mode switching function, is proposed in this paper. The modified current observer can solve the chattering and phase delay problem while still maintaining t...