Design of a Multipole Line Start Permanent Magnet Machine

Line start permanent magnet machines (LSPMSMs) are a promising machine technology for upgrading the industrial induction motors. Thanks to the usage of the magnets, LSPMSMs can generate high torque density values, which can be very useful for direct-drive applications. Nevertheless some critical design aspects such as the starting and the synchronization issues must be overcome. These performances are even more critical in high pole number motors. In this paper, a multipole LSPMSM comprising 16 poles is designed and analysed for its application in an industrial hoisting system. The proposed design has been prototyped, and some promising preliminary experimental results are reported in this paper, which show the feasibility of The proposed design.