Abstract
A surface-mounted permanent magnet (SPM) machine is widely used in many auxiliary parts of an electric vehicle, so its design level directly influences the performance of the electric vehicle. In the design process of the SPM machine, selecting the appropriate stator slot and rotor pole combination and pole arc coefficient is a necessary and important step. Therefore, in this paper, a 750 W machine is set as an example to research stator slot and rotor pole combinations and pole arc coefficients for the SPM machine. First, the design schemes of machines adopting different stator slot and rotor pole combinations are determined according to the winding coefficient, stator size, and electromagnetic performance requirements. Further, finite element models of SPM machines with different stator slot and rotor pole combinations are established by Ansys Maxwell. On this basis, the back electromotive force (back EMF), cogging torque, electromagnetic torque, and loss and efficiency of SPM machines are calculated and compared to select the better stator slot and rotor pole combinations. Further, effects of pole arc coefficient on cogging torque and electromagnetic torque are also researched to guide the selection of the pole arc coefficient in the design process of the SPM machine. Conclusions achieved in this paper will provide guidance for design of the SPM machine.
Highlights
A surface-mounted permanent magnet (SPM) machine has many advantages, such as a simple structure, high efficiency, and low cost, and has been used in many auxiliary parts of electric vehicles
In the SPM machines adopting different stator slot and rotor pole combinations, the resistance values are different due to the different winding arrangements and the number of conductors per slot, which results in differences in copper loss
Based on these stator slot and rotor pole combinations, this section will research the effect of pole arc efficient on cogging torque and electromagnetic torque further to guide the selection of the pole arc coefficient
Summary
A surface-mounted permanent magnet (SPM) machine has many advantages, such as a simple structure, high efficiency, and low cost, and has been used in many auxiliary parts of electric vehicles. References [25,26] research the effect of pole arc coefficient on the magnetic field in a PM vernier machine and a PM linear synchronous machine, respectively Both stator slot and rotor pole combination and pole arc coefficient are important geometry parameters in the design process of an SPM machine. This paper is prepared as follows: In Section 2, SPM machines with different stator slot and rotor pole combinations are designed, respectively, according to winding coefficient, stator size, and electromagnetic performance requirements. The research conclusions achieved by this paper will provide guidance for the design of an SPM machine
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