Abstract
The influence of bread-loaf shaped magnet poles under parallel magnetization on the cogging torque of surface-mounted permanent magnet (SPM) motors is studied. For the SPM motors having magnetic poles with eccentricity and sine harmonic compensation, the electromagnetic performances of integer and fractional slot motors are compared. It is found that the cogging torque and torque ripple of the integer and fractional slot motors can be reduced with the same eccentric magnet pole. The cogging torque and torque ripple of a fractional slot motor can be decreased by sine harmonic compensation, however, the same sine harmonic compensation has a small influence in integer slot motors. By varying the magnetic poles, the contribution of the field harmonics (k = (2n + 1) p), which are a direct result of magnet magnetization, to the cogging torque also changes. The electromagnetic performance of a 3 kW prototype is tested, and it is found that the experimental results validate the theoretical investigation.
Highlights
The surface-mounted permanent magnet (SPM) motor has many advantages, such as a small size, light weight, simple structure, reliable operation, and high torque density
According to Tabs. 2 and 3, the eccentric magnetic pole has a significant effect on the reduction in the cogging torques and torque ripples of both motors; the magnetic pole with sine harmonic compensation is suitable for use in the fractional slot motor
We investigated the influence of a bread-loaf shaped magnet pole on the cogging torque of PM motors
Summary
The surface-mounted permanent magnet (SPM) motor has many advantages, such as a small size, light weight, simple structure, reliable operation, and high torque density It is widely used in ship construction, aviation, public life, and other fields[1,2,3,4,5]. [24], a tangent harmonic compensation (THC) method for optimizing the magnet shape of a 6-pole/9-slot motor was presented. It adapts to cases in which low torque ripples are obtained. After the shape of the magnet poles was changed, to better analyze the variation in each field harmonic, the FE and analytical method is adopted.
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