ELECTRICAL MACHINE STATOR CORE Russian patent published in 1997 - IPC

FIELD: electrical engineering; electric motors for driving washing machines, wood- and metal-working machines, etc. SUBSTANCE: stator core has end rings, bracing members, and M stator stampings n-angles over external outline. Stator stampings have M slots on inner diameter and punchings over outer perimeter. Stator stampings are assembled in N elementary stacks of M/N= 1,2,3. .. stampings with coinciding sides on external outline. Adjacent stacks are tangentially spaced apart through angle α=2•π•K/Z, where K=1,2,3. . . , forming external toothed outline. External sides of each elementary stack, except for extreme ones, have on end sides mating points with external sides of adjacent elementary stacks. Mating points are located on i= 1,2,3. . . concentric circumferences with diameters D_i meeting unequality D_min≅ D_i≅ D_max, where D_min is internal diameter of mating points corresponding to polygon circumscribing circle with stampings arranged inside it without clearances in axial direction; D_max is external diameter of mating points corresponding to internal diameter of teeth of core toothed outline. According to invention, corner parts of stampings have m+2 mentioned punchings between mating points on D_max, where m=0,1,2... are internal punchings over perimeter in corner part of stamping with two external ones. The latter form external slots of stator core. External punchings over stamping perimeter form r slots whose symmetry axes cross mating points of elementary stacks on D_max. Stator core bracing members are placed in b ≅ r slots. EFFECT: simplified design of stator core. 5 cl, 8 dwg