Compared with traditional induction machine and direct current (DC) machine, permanent magnet synchronous machine (PMSM) holds the merits of higher torque ability, efficiency and etc., when high magnetic co-energy sintered NdFeB magnet is used. However for high frequency operation, the resulted eddy current loss by permanent magnet (PM) is very high and this kind of loss can bring the PM with high temperature rise, moreover it will make the PM face the risk of irreversible demagnetization. To reduce PM eddy current loss, complete magnet segmentation (CMS) is an effective method, however taking this kind of method will increase manufacturing cost and reduce mechanical robustness of PMSM. Thus, a partially magnet segmentation method was proposed in the past. In this paper, a new annular partial segmentation method is proposed for PM eddy current loss reduction, namely single side annular partial segment (SSAPS) and double side annular partial segment (DSAPS). Considering that the additional process on the PM will reduce the mechanical robust of the PM and electromagnetic performance of machine, both the electromagnetic performance and the mechanical strength of PM has been analyzed, based on 3D finite element method (FEM). It can be found that if the proposed new annular partial segmentation (APS) method is adopted, then the eddy current loss in PM can be reduced greatly while the mechanical robustness of the PM can be guaranteed comparing with the traditional partial magnet segmentation method.
To improve output torque ability and reduce torque ripple in traditional synchronous reluctance motor (TSynRM), a new synchronous reluctance motor (NSynRM) is proposed in this paper. The rotor of NSynRM is composed of both grainoriented silicon steel and non-oriented silicon steel. With the reasonable design of rotor structure, the torque of NSynRM has been improved and its torque ripple has been reduced greatly. Firstly, TSynRM and NSynRM are qualitatively compared by using the magnetic network method. Secondly, the main parameters of these two machines are optimized by using finite element method (FEM). Then the performance comparison between two optimized machines are carried out. Finally, the equivalent stress of these two machines at the maximum speed are analyzed. It can be seen that NSynRM can have 6.8% higher torque under rated load, 8% higher torque under maximum load, 17.5% wider constant torque operation region, and lower torque ripple compared with the TSynRM.
This paper proposes a novel permanent magnet assisted synchronous reluctance (PMAREL) machine, the main structure of this machine is quite similar to that of traditional PMAREL machine, and the main difference is that the grain-oriented silicon steel is used to replace some part of the stator teeth. The rolling direction of the grain-oriented silicon steel is along the radial direction of the machine, thus the advantage of higher permeability and higher kneel point in this material can be used to release the flux saturation problem of the traditional non-grain-oriented steel used in the PMAREL machine when the applied current density is high. Firstly, the structure of both proposed novel and traditional PMAREL machines are optimized and the design parameters are determined. Secondly the electromagnetic and mechanical performance are compared in these two machines which includes the demagnetization analysis, mechanical stress analysis when the rotor at the maximum speed, torque ability, efficiency by using the finite element method (FEM). It can be seen that the problem of stator teeth saturation in the novel PMAREL has been alleviated, and compared with the traditional PMAREL machine, the novel PMAREL has higher efficiency, wider speed range and 7% higher torque ability.
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