Patent ID: 7859162

Claim:
An armature of a rotary motor comprising: an armature core structured splittably into magnetic tooth members which are individually wound by concentrated-winding type coils; and a commutator having the same number of segments as the number of said magnetic tooth members and connecting terminals by which the coils wound on said magnetic tooth members are connected to said individual segments; wherein an end portion of the coil concentratedly wound on one of said magnetic tooth members is connected generally in a straight line to the connecting terminal of said segment which is located at a position offset in a circumferential direction by a specific angle from said one magnetic tooth member, and a conductor line connected to the connecting terminal of said segment is concentratedly wound on another one of said magnetic tooth members adjacent to said one magnetic tooth member; and wherein an insulator is fitted on each of said magnetic tooth members, the insulator having a pair of projecting parts which form a guiding groove therebetween at a commutator side end portion of the insulator closer to a central axis of said armature core, the guiding groove formed in said insulator having a bottom surface which slopes radially inward in a direction toward a central axis of said commutator for guiding the conductor line between the projecting parts in the radial direction of the slope.