MAGNETIC CIRCUIT AND ITS MANUFACTURING PROCESS Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: reinforcing members are joined to stack by single-seam relief welding over entire mating surface of each member. The latter are embedded in stack body through depth h or abut cylindrical surface of magnetic circuit and protrude above it through d_nom.r.m.-h,, h being determined from equations h = (d_nom.r.m./2)·(1-cosα) at α = (0-π/2) and α = arcsin[(P_s·S_l)/(0,59[δ]_p·d_nom.r.m.·L·n_r.m)],, where d_nom.r.m. is nominal diameter of reinforcing member sectional area, mm; α is half-angle of mating sector of reinforcing member and stack surfaces; P_c is applied compression pressure of stack, kg/sq. mm; S_l is surface area of magnetic circuit laminations, sq. mm; [δ]_r is permissible stress of reinforcing member material, kg/sq.mm; n_r.m. is number of reinforcing members bracing the stack; L is stack length, mm. Reinforcing member are welded to stack in solid phase with welding force of applied to them sufficient to embed reinforcing member into stack body through height h or to crumple it through same value, where [δ_u] is yield strength of reinforcing member material at welding temperature, kg/sq.mm. EFFECT: improved reliability of magnetic circuit, reduced material input. 2 cl, 5 dwg