Patent ID: 6075305
Filing Date: 2000-06-13
Classification: H02K

Abstract:
A dynamo-electric machine comprising:an armature having a core provided with a plurality of slots extending longitudinally and an armature coil formed by winding a wire into said slots;a commutator assembly having a plurality of commutator segments arranged thereon, risers disposed on end portions of said commutator segments, and brushes in contact with said commutator segments;a equalizer electrically connecting portions of armature circuits comprising said armature coil, said risers, and said commutator segments which are to have the same electric potential,said dynamo-electric machine satisfying an expressionR.sub.eq .gtoreq.(.rho..sub.0 .multidot.(r1*.tau.)/(S/3))*(2.5)where .rho..sub.0 (.OMEGA..multidot.m) is the resistivity of said wire of said armature coil,S (m.sup.2) is the cross-sectional area of the conductor portions of said wire,r1 (m) is radius of rotation of the connecting portions between said armature circuits and said equalizer,.tau. (rad) is the pitch of pole pairs, andR.sub.eq (.OMEGA.) is the resistance value of said equalizer.