FIELD: electrical and electromechanical engineering; stators of three-phase induction and synchronous machines; wound rotors of induction motors.
SUBSTANCE: proposed double layer, m= 3-phase, m' = 3-band, fractional-pitch lap winding placed in z = 171 slots at 2p = 34 poles, slots per pole per phase q = z/3p of 3p = 51 coil groups numbered 1G through 51G has its coils definitely grouped in coil-group row 4 3 4 3 3 4 3 3 4 3 3 4 3 4 3 3 repeated three times; novelty is that coil turn number at slot pitch ys = 5 is (1 - x)wc, wc, wc, (1 - x)wc for four-coil groups and coil turn number wc, (1 + x)wc, wc, for three-coil groups at optimal value of x, xopt = 0.39, where 2wc is turn number in slots completely filled with winding.
EFFECT: minimized differential dissipation of winding.
1 cl, 4 dwg
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