电机学电机学电机学 (19).ppt
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1、Electrical MachineryComposition principle of AC winding and phase belt dividing uStrive to make wave forms of resultant EMF and resultant MMF be sine wave and big amplituded.uFor three-phase winding,EMF and MMF of each phase should be symmetrical,and resistance and impedance should be balanced;uCopp
2、er loss of winding should be small and copper usage amount should be small;uInsulation should be reliable,mechanical strength and heat dissipation condition should be good,manufacture should be convenient.4.2 Basic knowledges of AC winding I.Composition principle of AC windingArrangement law of 60 p
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