1334102 Making commutators GENERAL ELECTRIC CO 3 Sept 1971 [1 Oct 1970] 41154/71 Heading B3A A cylindrical commutator for a dynamoelectric machine is made by adhesively securing commutator segments 18 to the outer cylindrical surface of a base member 16. The member 16 is placed on a rotatable shaft 22 and adhesive is applied to the roughened outer surface of the member 16 or to a commutator segment 18 positioned by a mechanical or suction gripper in a supply device 28. The segment 18 is brought into contact with the member 16 by lowering the device 28 whereupon the adhesive is activated by supplying an electrical current through leads 34 connected to the member 16 and/or segment 18 or by applying ultrasonic vibration to the segment 18. After returning the device 28 to its initial position, the shaft 22 is rotated, to enable the next segment 18 to be secured which may or may not be the adjacent segment in the completed assembly. The adhesive is cured by wrapping straps around the bonded assembly and heating it. The segments 18 may be restrained from movement in use by means of bands. Suitable adhesives which may be used are disclosed. The commutator segments 18, which may be of zinc plated copper heated at 180-250‹ C. to diffuse the zinc into the copper, are integral with or joined by wires (12a) (Fig. 1, not shown) to the armature coils (12).
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