Position Error Suppression Strategy for Electrolytic Capacitorless IPMSM drives

Interior permanent magnet synchronous motor (IPMSM) drives with single-phase input diode rectifiers using small-volume film capacitors offer many advantages, such as high reliability, low cost, and high power density. However, the position observation error in position sensorless control fluctuates more compared to conventional topologies due to the use of slim film capacitors. In this paper, a position observation error suppression strategy using multiple second-order generalized integrators is proposed. Cross-pair harmonic cancellation is performed using parallel multiplexed filter modules. The method proposed in this paper improves the frequency-specific harmonic suppression compared to conventional harmonic suppression methods.