Research On 37kW Line-start Permanent Magnet Assisted Synchronous Reluctance Motor In Compressor

Nowadays, air compressor drives employ induction motors, and its performance is not good. Some scholars research on air compressor which is driven by line-start permanent magnet synchronous motor(LSPMSM), but this motor need rare earth permanent magnet materials and its cost is high. In the view of these issues, this paper proposes line-start permanent magnet assisted synchronous reluctance motor(LSPMa-Syn RM)to instead the LSPMSM for air compressor. LSPMa-Syn RM can use ferrite magnets, it has low cost and higher performance price ratio.At first, this paper summarizes the development and research status of air compressor, line-start permanent magnet synchronous motor and permanent magnet assisted synchronous reluctance motor. Aiming at the existing problems of LSPMSM, we have put forward by the LSPMa-Syn RM to replace the LSPMSM for air compressor. Secondly the basic theory of PMSyn RM has been briefly introduced, and the principle of maximum reluctance torque has been expounded.Next, the influences of LSPMa-Syn RM torque angle chararcteristic, breaking torque and asynchronous torque has been discussed when the saliency ratio, no-load FEM and other changing. And the principle and steps of how to calculate the LSPMa-Syn RM inductance though finite element method has been introduced. Thirdly the electromagnetic of 37 k W LSPMa-Syn RM are designed, and the optimization of slot combinations and rotor magnet placed shceme are been done. And then it verifies flux compensation formula by using U type three layer magnet with the same thicknes model. Next block current, block torque, minimum torque and maximum torque has been calculated through finite element simulation method.The main performance of LSPMa-Syn RM and LSPMSM were compared through simulation results, their advantages and disadvantages are clear and analysised. Finally, a 1.5k W LSPMa-Syn RM prototype is trial-manufactured combined with the existing condition of our laboratory, and the prototype experiments are carried out. A sense of conclusions were obtained, which could supply a helpful reference to the further study of 37 k W LSPMa-Syn RM.