Importance

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Abstract

A commutator for electric machines is disclosed. The commutator comprises a cylindrical body of insulating material having a plurality of lamella segments affixed by means of projecting anchoring elements about the periphery thereof. Each lamella segment is provided at one end with a hook base and hook to the latter of which a coil wire is electrically and mechanically connected by welding. The insulating body has radially and axially projecting ribs which support the respective hook bases of the lamella segments. The width of each supporting rib and associated hook base gradually increases from a point adjacent the hook toward the transition from the hook base to the lamella segment to provide better support and heat conductivity during the process of welding the coil wire to the hook. The commutator is constructed by forming an annular lamella jacket from a continuously rolled profiled strip having a plurality of cam-shaped elements and crosspieces the latter of which are separated from the strip by a circular scaling blade to form the coil hooks. A pair of circular counter blades are used to separate the opposite ends of the cam-shaped elements and form the anchoring elements of each lamella segment.

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First Claim