A Research and Optimization of a Novel Less-Rare Earth Permanent Magnet Synchronous Motor

Abstract

In recent years, the unreasonable exploitation and destruction of rare-earth resources have led to a sharp increase in the price of rare-earth permanent magnet materials, which indirectly leads to a sharp increase in the manufacturing cost of electric vehicles(EVs). In order to solve a series of problems caused by the scarcity of rare-earth resources, a novel less-rare-earth permanent magnet synchronous motor(LRE-PMSM) is proposed in this paper based on the magnetic circuit of the baseline motor and the equivalent magnetic circuit method (EMC). Then, the mathematical model of the optimization objective is established by the central composite design method(CCD) of response surface methodology(RSM), and the multi-objective optimization of the rotor topology of the LRE-PMSM is performed. Finally, the optimization results are compared with the baseline motor and the results show that the proposed LRE-PMSM not only has similar output performance as the baseline motor, but also has better overload and demagnetization ability and reduces motor manufacturing cost, which means it would be a promising candidate for EVs.