Abstract
The magnetomotive force (MMF) of a usiual symmetrical three-phase winding contains higher harmonic components of the orders v= 6k ±1, k= 1,2,3,... The MMF of the combined winding does not contain harmonic components with the odd numbers k= 2n- 1, n= 1,2,3,..., which make half of the above-mentioned harmonic components. This MMF contains the remaining higher harmonics of the same orders v= 6k ±1, but only with the even numbers k= 2n, n= 1,2,3,.... The amplitudes of these harmonic components are almost identical with the amplitudes of similar harmonic components generated by a conventional winding that produces the combined one. Therefore, the MMF curve of the combined winding is closer to a sinusoidal waveform as compared with the MMF waveform generated by the classic winding. Electrical machines fitted with a combined winding will have a lower level of additional losses in the active materials of rotor and stator. Switched machines fitted with a combined stator winding will produce lower levels of vibration and noise due to more than half as high amplitude of electromagnetic torque pulsations, which also have twice as high frequency.
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