Patent ID: 6552463
Filing Date: 2003-04-22
Classification: H02K

Abstract:
A dynamo-electric machine comprising:an armature including an armature core provided with a plurality of slots extending in an axial direction of the armature core and disposed alongside each other in a circumferential direction of the armature core, and an armature winding mounted in the slots provided on the armature core, wherein the armature winding comprises first wave-shaped windings and second wave-shaped windings, the first wave-shaped windings comprising a number of first winding sub-portions each having one turn constructed by winding in a wave-shape a strand of wire so as to alternating occupy an inner layer and an outer layer in a slot-depth direction within the slots at intervals of a predetermined number of slots, the first winding sub-portions being disposed at a pitch of one slot from each other and being equal in number to the predetermined number of slots, and the second wave-shaped windings comprising a number of second winding sub-portions each having one turn constructed by winding in a wave-shape a strand of wire so as to alternating occupy an inner layer and an outer layer in a slot-depth direction within the slots at intervals of the predetermined number of slots and so as to be inversely wound and offset by an electrical angle of 180 degree relative to the first winding sub-portions, the second winding sub-portions being disposed at a pitch of one slot from each other and being equal in number to the predetermined number of slots, whereby n-pairs of the first wave-shaped windings and the second wave-shaped windings are disposed so as to arrange alternately and in a row in-slot-received portions of the first winding sub-portions and in-slot-received portions of the second winding sub-portions in the slot-depth direction within each of the slots; and wherein the armature winding includes winding phase groups for each phase, each of the winding phase groups comprising 2n windings composed of the first and second winding sub-portions disposed in a group of slots at intervals of the predetermined number of the slots, two sets of the n windings being connected in series to form two series-connected windings each having n-turns, whereby the winding phase group is constructed by connecting the two series-connected windings in parallel, where n=2m+1, and n and m are natural numbers.