| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing molded yokes for a PM-type stepping motor which allows insert-molding without preparing pinching margins at outer peripheral sides of annular flat plates, and increases a winding space. Ž<P>SOLUTION: In the method of manufacturing the molded yokes 2 for the PM-type stepping motor which resin-molds the inner yokes 20a (20b) as insert materials, the inner yokes 20a (20b) have tongue-shaped protrusive pieces S extending radially inward from the annular flat plates 21a (21b) between roots of adjacent pole teeth 22a, 22a (22b, 22b), inner metal molds 41, 42 having pole-tooth shaped protrusions K abutting on the tongue-shaped protrusive pieces S are arranged at inner peripheral sides of the inner yokes 20a (20b) so that the metal molds are arranged alternately with the pole teeth 22a (22b), and outer metal molds 51, 52 are arranged at the outer peripheral sides of the inner yokes 20a, 20b, thus filling resin into a gap G between both metal molds. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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