Research on Modular Five-phase Fault-tolerant PMSM for Electric Vehicles

• 1、School of Electrical Engineering &Automation，Harbin Institute of Technology，Harbin，150006

Abstract：In order to achieve the goal of stator-modular design and zerophase-to-phase mutual inductance of five-phase permanent magnet synchronous machine (PMSM). A hybrid single/double-layer fractional-slot concentrated winding (FSCW) is proposed in this paper, and the electromagnetic performance, the open-circuit fault-tolerance control strategy and the inter-turn short circuit are analyzed. Firstly, the magnetic isolation performances of the traditional two-layer FSCWand hybrid single/double-layerFSCWare compared by finite element method (FEM). The results show that the hybrid single/double-layerFSCW can realize the goal of zerophase-to-phase mutual; Secondly, for the one-phase open circuit fault, the fault-tolerant currents for both full-bridge and half-bridge driving modes are caculatedbased on the principle of constant magnetomotive force and the principle of constant power.and the control effects are verifiedby FEM. The results show that The full bridge driving mode can maintain the average output torque and effectively reduce the torque ripple when adoping the fault-tolerant control strategy Finally, for the inter-turn short circuit fault, the equivalent circuit analytical model of short-circuit faults is established, andinductance parameters of the short-circuit winding and the remaining winding are caculated by equivalent magnetic circuit methodto caculate the short-circuit winding currents. In order to show the effectness of the method, the results are compared with the one caculated by FEM.

Keywords： Electrical machine and apparatus five-phase fault-tolerant permanent-magnet synchronous machine hybrid single/double-layer fractional-slot concentrated winding fault-tolerant control strategy inter-turn short-circuit