| 摘要 |
1,267,898. Dynamo-electric machines. INTERNATIONAL BUSINESS MACHINES CORP. 8 Jan., 1971 [29 Jan., 1970], No. 929/71. Heading H2A. [Also in Division H1] A method of making a tubular armature for use in an electric motor comprise depositing by plating copper 11 on to a stainless steel mandrel 10, covering the copper with a layer 12 of epoxy and, a braided glass sleeve or a winding of glass filament, curing layer 12 under 150 p.s.i. pressure grinding the layer 12 to desired wall thickness and breaking the copper epoxy-glass cylinder loose from the mandrel. The epoxy glass layer is removed from the copper at two bands 15, 16, Fig. 4, and a further layer of copper electrolessly deposited and the mandrel completely removed so as to form a coppersheathed tube, the layers of copper joining and extending beyond the ends of the epoxy tube. Conductors 22, 23, 25 &c. are formed; by conventional techniques, e.g. photo-etching, to form the completed armature, Fig. 6, having a continuous wave-type winding. The mandrel may be removed by passing the epoxy coated assembly through a die of larger diameter than the mandrel. |
