Patent ID: 7262538
Filing Date: 2007-08-28
Classification: H02K

Abstract:
1. A stator for an electric rotary machine, comprising: a stator core having a plurality of teeth; and an insulation coated coil conductor wound around each of the teeth of the stator core as a tooth coil, wherein each insulation coated coil conductor comprises: a first layer coil wound around the corresponding tooth so as to advance from a proximal end portion of said tooth to a distal end portion of said tooth; and a second layer coil provided on the first layer coil and wound around the tooth so as to advance from the distal end portion to the proximal end portion of said tooth; and wherein said tooth coils are classified into a plurality of phase windings respectively corresponding to a plurality of different phases such that each winding receives a phase current, each phase winding has N (N is an even number equal to or larger than 2) serial coil units connected in parallel with one another; each serial coil unit has plural tooth coils serially connected with one another such that each tooth coil receives a coil current which has a strength equal to 1/N of a strength of the phase current, and a total number of turns in each tooth coil is a limited even number which is N times of a certain odd number such that each tooth coil receiving the coil current is equivalent to a virtual tooth coil which receives the phase current and has turns set at the certain odd number.