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This paper explores the simulation technique of the harmonic current under phase angle control of a universal motor. The harmonic current generates the damage-by-fire accident of the transformer and phase advance capacitor, both of which are connected to an electric power system. This problem has warranted new standards imposed by the IEC. Comparatively, the universal motor for vacuum cleaners is...
This paper focuses on the restraint method of the 3rd harmonics current, in which close attention has been paid to the iron core shape of the universal motor for power vacuum cleaners. In this paper, the gap permeance, magnetic saturation of an iron core, and the influence that a slot ripple has on harmonic current were verified using FEM electromagnetism analysis. As the result, stator core shape...
The universal motors of our advanced research use FEM simulations to perform modeling of universal motors rotating at ultrahigh speed by using the like state function method with respect to the details regarding the commutation scintillation phenomenon of the commutators, the air gap surface, and the contact condition of the brushes. As a result, at the design stage, the commutation scintillation...
As requirement of a motor these days, both the demand of the reduction of high frequency iron losses by a high speed PWM control and the improving of the acoustic noise are severe especially. In that time, the subject is 500-1000 Hz in a fundamental frequency in iron loss and reduction of 10-15 dB is a target value. However it is not easy to realize this condition with the conventional Si steel plate...
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