A Novel Maximum Current Sharing Method for Dual-Redundancy PMSM based on the Sliding Mode Error Compensation

Dual-redundancy permanent magnet synchronous motor (PMSM) plays an important role in the aerospace field because of its redundancy and high reliability. The special motor structure can lead to the current imbalance between the two stator windings, which can result in torque disequilibrium, the increase of motor torque ripple, and the poor control performance. A new current balance strategy has come forth. This paper proposes a dual-redundancy PMSM mathematical model to explain the current generation mechanism first. In this model, the performance characteristics of the classical current balance methods are evaluated, but it is found that the dynamic response performance will not be qualified. In order to realize the current balance of two sets of three-phase symmetric coils quickly and effectively, a maximum current sharing method based on sliding mode error compensation is proposed. The simulation results prove that the proposed algorithms are effective.