| 摘要 |
PURPOSE:To manufacture an annular core block inexpensively without using an expensive mold and without requiring much labor, by disposing inner and outer tubes along the inner and outer peripheral surfaces of a core block. CONSTITUTION:An electromagnetic steel plate is superposed on a fixture board 10 so as to form a sectorial core sequentially, and thereby an annular core 3 is constructed. Next, an inner tube 13 and an outer tube 14 are fitted on the inner and outer peripheries of the annular core 3 respectively, and the lower ends of these inner and outer tubes are made to contact closely with packings 11 and 12. Then, an annular packing 15 is disposed at the upper end of the inner tube 13,and an auxiliary inner tube 16 is disposed. Meanwhile, an auxiliary outer tube 17 having the same inside diameter as the outer tube 14 is disposed on the outer tube 14. The upper ends of the auxiliary inner and outer tubes are made to be on the same plane. Next, synthetic resin is poured into a core cast-molding frame constructed of the inner and outer tubes and the auxiliary inner and outer tubes, and is set by heating. After the resin is set, the auxiliary inner and outer tubes are removed. |
