Patent ID: 9030076
Filing Date: 2015-05-12
Classification: H02K

Abstract:
1. An electrical rotary machine comprising: a rotor rotatably attached to a housing; and a stator provided at a radially outward position to oppose to the rotor and including: a holding ring including a circular cylindrical portion and being attached to the housing; and a plurality of split cores formed by layering core plates made of electromagnetic steel plates, the split cores fixed to an inner circumference of the circular cylindrical portion and around each of which a coil is wound; each of the split cores including: a tooth portion extending in a radial direction while being attached to the holding ring, the coil being wound around the tooth portion; and a back yoke portion connected to the tooth portion at a radially outward position and extending in a circumferential direction; the plurality of split cores being fittably attached to the inner circumference of the circular cylindrical portion of the holding ring by press fitting or shrink fitting with an interference interposed so as to apply a surface pressure thereto, while being annularly disposed with end surfaces of the adjoining back yoke portions abutting on each other, wherein a slit is provided at the back yoke portion of each of the split cores and penetrates therethrough except for either circumferential end of the back yoke portion, wherein each of the split cores is formed by layering a plurality of first core plates and a plurality of second core plates in a predetermined order, the first core plates are formed such that outer circumferences of the first core plates protrude radially outward from outer circumferences of the second core plates; and wherein the slit is provided at the back yoke portion of each of the first core plates and penetrates therethrough except for either circumferential end of the back yoke portion.