Commutator for electric machine utilising thermal properties of metal - has conductive blades hooked into insulating material of boss and secured by expansion of metal or shrinkage of insulation

摘要

The blades (2) are stamped and bent esp. out of Cu strip with anchoring claws (3,4) extending in pairs from the underside into an insulating boss (1), with their ends (32,42) turned up at an acute angle (alpha). Force is exerted in the direction of the axis (11) of the boss by the pressure of shrinkage of the insulation itself or by the thermal expansion of the blades. The hooks are formed at the ends of vertical stems (31,41) of the claws. USE/ADVANTAGE - The blades are guaranteed to remain in firm contact with the insulating boss even during prolonged spells of operation.