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This paper focuses on the restraint method of the 3rd harmonics current, which close attention has been paid to the iron core shape of the universal motor for power vacuum cleaners. In this paper, the air gap permeance, magnetic saturation of an iron core, and the influence a slot ripple has on the harmonic current were verified using FEM electromagnetism analysis. As the result, stator core shape proved quantitatively that a restraint of harmonic current has effect. The authors assert that a design manual should be adapted to create international standard about a restraint of the harmonic current of a universal motor.
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