The Vector Control Strategies for Multiphase Synchronous Motor Drive Systems

This paper studies the multiphase synchronous motor with symmetrical windings and multi-Y-windings displaced in turn by ¿o separately, the mathematical descriptions about which can be concluded as two models: single-windings and multi-windings models in M,T frame. Based on these models, the multiphase vector control strategy and multiphase multi-ply vector control strategy are proposed, so as to achieve the gas-flux-oriented control for multiphase synchronous motor in two models of mathematic descriptions. The corresponding control frames are established for the multiphase synchronous motor drive systems. Taking the 12-phase synchronous motor with four Y-connected 3-phase symmetrical windings displaced in turn by 15° as an example, the 4-ply control principle is deduced. The experiment results show the system has perfect control and operation performance under such a control strategy.