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Armature for an electric rotary machine and method of manufacturing the same
| Details |
Inventors: Honshima, Teruhisa; Watanabe, Yasuaki; Takahachi, Akira; Samata, Tadayochi; Tohkairin, Akira; Ogasawara, Nobuhiko;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Hall; Carl E.
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry & Wands
An armature for an electric rotary machine, comprising a laminated iron core including a plurality of slots, and teeth, alternately disposed in the cylindrical surface of the iron core, windings placed in said slots, and anchors for preventing the windings placed in the slots from being displaced, wherein the anchors are formed by deforming the end portions of the teeth, while forming before mounting the windings into the slots, a through hole extending through the end portion of each tooth. |
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DETAILED DESCRIPTION An object of the invention is to eliminate the drawbacks of the prior art and provide an armature for an electric rotary machine having a structure which assures forming of curved anchors over the openings of the slots to prevent the winding from being displaced.
The above-mentioned object can be achieved by providing half-closed slots which are formed by pressing and deforming the top end portions of the teeth between adjacent pairs of the slots in the armature core, while forming before mounting the windings into the slots, a through-hole at the end portion of each tooth.
The through-hole formed at the end portion of each tooth provides an empty space which is completely surrounded by the core material.
When the end portion having through-hole is deformed, therefore, tension is produced in the portion surrounding the through hole thereby forming the winding-blocking anchor properly curved without bending into the slot.
The anchor thus formed will not damage the insulator coating of the winding placed in the slot, and the pressed surface of the tooth is flat so that the uniformity of magnetic reluctance can be maintained.
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Metal Working 
