| 摘要 |
1,240,544. Making rotors; welding by pressure. JOSEPH LUCAS (INDUSTRIES) Ltd. 29 Jan., 1969 [9 Feb., 1968], No, 6463/68. Headings B3A and B3R. [Also in Division H2] A method of making a permanent magnet rotor for a dynamo-electric machine includes positioning a plurality of permanent magnets 16 between a central polygonal core 17 and an outer pole assembly 11 so that the magnets are in contact with both the pole assembly and the core, deforming at least one axial end of the core to prevent relative axial movement between the core and the magnets and removing portions 15 of the pole assembly to separate the poles. The pole assembly 11 is built up from a plurality of mild steel laminations held together by welding or rivets and the magnets 16 engage in axial channels 13 in the pole assembly. The core 17 is of mild steel and it is formed with a circular groove (19) in each end face. The outer wall (21) of the groove is heated by a pair of electrodes and the electrodes are moved towards one another to deform the outer wall and weld it to the magnets, Fig. 2 (not shown). The assembly is then placed in a mould, which is then filled with molten aluminium and finally the portions 15 are removed as the assembly is machined to cylindrical form, thereby separating the poles. |
