| 摘要 |
1477510 Making moulded stator cores WESTINGHOUSE ELECTRIC CORP 2 Sept 1974 [11 Sept 1973] 38224/74 Heading B3A A method of making a moulded core having a conductor embedded in it comprises forming the conductor 10, assembling the formed conductor in a flexible container 20 adding insulated ferro-magnetic micro-laminations 35 which have been annealed, into the container, sealing the container, compressing the microlaminations about the conductor to attain a packing factor in excess of 80% and removing the core from the container. The microlaminations comprise parallelepipeds of low carbon steel and they are formed by cutting unplated tin can stock with a high speed rotary cutter unsupported or by slitting the stock and then cutting it with a rotary cutter against a stationary knife edge. Alternatively the microlaminations can be formed from steel wool, shavings or scrap cobalt iron. The microlaminations are annealed at 700‹-800‹C for stress relief, deoxidation, decarburization and improvement of magnetic characteristics. The container 20 is formed of flexible polyurethane resin and the conductor 10 is coated with a rigid insulating coating (16), Fig. 1 (not shown), which maintains its shape after removal from the winding mandrel. The coil is placed in the container along with a core bar 30 and the container is vibrated while the microlaminations 35 are placed around the coil and in a space 34 between the core bar and the coil. A seal 36 is applied to the container when the required amount of microlaminations has been supplied and the sealed container is placed in an isostatic pressurization chamber, where a pressure of about 50 000 psi is applied. Binders for the microlaminations are not normally required, but they may be used if the core is to be subjected to high rotational stresses or if a low isostatic pressure is employed. If necessary a tape of magnetic material may be wound round the core to serve as a yoke. |
