Stator of drive motor for electrically operated valve

摘要

The invention intends to improve a stator which is detachably installed to an outer peripheral portion of a can accommodating a rotor. The stator is integrally formed with a resin mold by arranging a stator assembly (110) within metal molds (300, 310) and injecting a molten resin (P1) from a gate (G1) at one position. An annular plate (160) is mounted to an upper portion of the stator assembly (110) so as to prevent the molten resin from intruding into magnetic pole teeth (120a, 122a), and prevent a weld line from being generated in an outer peripheral surface of the resin mold.

主权项

1. A stator of a drive motor for an electrically operated valve which is installed to an outer peripheral portion of a can attached to a valve main body having a valve port which is opened and closed by a valve member coupled to a rotor,
wherein said stator comprises: a stator assembly which is provided with a yoke having magnetic pole teeth and a coil; and a resin mold which integrally forms said stator assembly from a molten resin injected within a metal mold, and wherein said stator comprises: a plate having an inner diameter which is substantially the same as an inner diameter of said magnetic pole teeth, and arranged in an upper surface of the stator assembly so as to prevent the molten resin from flowing to the magnetic pole teeth side when the molten resin is injected into the metal mold, wherein said resin mold is formed by the molten resin which is injected from only one gate provided in an upper portion of the metal mold opposed to the plate, and cured to have no weld line in an outer peripheral portion of the resin mold.