A Novel Dual Stator Line-Start Permanent Magnet Synchronous Machine

This paper presents a novel dual stator line-start permanent magnet synchronous motor (LSPMSM), which can remove the contradiction between the starting torque and the synchronization capability existing in the conventional LSPMSM by fundamentally eliminating the braking torque at the starting stage. The structure and principle of the proposed machine are given, which can be considered as the combination of the outer rotor induction machine and the inner rotor surface-mounted permanent magnet (SPM) machine. The braking torque can be removed by locating the PM far away from the inner stator windings. Then, the detailed performance of the proposed LSPMSM, the pole-changing LSPMSM and the traditional LSPMSM is compared and analyzed by finite element analysis (FEA). The analysis results show that the proposed LSPMSM has the superior performance in terms of the starting capability, the synchronization capability and the on load capability.