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Structure-of-PM-step-motor-and-its-fabrication

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Structure of PM step motor and its fabrication

Details

Inventors: Cheng, Chun-Ying; Lee, Ken;
Assignee:
Primary Examiner: Hall; Carl E.
Assistant Examiner:
Attorney, Agent or Firm: Bacon & Thomas

A PM step motor fabrication method including the steps of i) preparing two windings, ii) fastening two annular intermediate metal plates together by spot welding, iii) mounting the windings on the annular intermediate metal plates, then covering two annular cover shells on the windings, and then fastening a top cap with an axle bearing to one annular cover shell, and then injection-molding a plastic packing member on the top cap within the annular cover shells to form a stator, iv) preparing a rotor, v) processing axle cap with an axle bearing by injection-molding, and vi) installing the rotor in the stator, permitting it to be supported on the axle bearing of the top cap and the axle bearing of the axle cap.

DETAILED DESCRIPTION The present invention has been accomplished to provide a step motor fabrication method which eliminates the aforesaid drawbacks.
According to one aspect of the present invention, the top cap and the axle cap are respectively molded on the respective axle bearings by injection-molding, therefore the step motor produces little noise when the rotor is turned in the axle bearings of the top cap and the axle cap within the stator.
According to another aspect of the present invention, the top cap is integral with the stator by an injection-molded plastic packing element.
According to still another aspect of the present invention, the injection-molded plastic packing element fills up the gaps in the intermediate metal plates within the cover shells.
According to still another aspect of the present invention, the axle cap has a plurality of mounting holes respectively forced into engagement with respective projecting rods of the injection-molded plastic packing element and then fixedly secured thereto by a ultrasonic welding apparatus.

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