| US 7,500,848 B2 | ||
| Mold used for manufacturing electric motor rotor | ||
| Takuya Maeda, Yamanashi (Japan); Takashi Okamoto, Yamanashi (Japan); Makoto Funakubo, Yamanashi (Japan); and Takeshi Tamaki, Yamanashi (Japan) | ||
| Assigned to Fanuc Ltd, Yamanashi (Japan) | ||
| Filed on Nov. 29, 2006, as Appl. No. 11/564,652. | ||
| Claims priority of application No. 2005-349945 (JP), filed on Dec. 02, 2005. | ||
| Prior Publication US 2007/0128307 A1, Jun. 07, 2007 | ||
| Int. Cl. H02K 15/03 (2006.01) | ||
| U.S. Cl. 425—542 [310/156.53] | 15 Claims |
| 1. A mold for use in a manufacturing process of a rotor of an electric motor, the rotor including a rotor core with a plurality
of magnet-retaining apertures and a plurality of permanent magnets individually received and retained in the magnet-retaining
apertures of the rotor core, respectively, wherein the mold is for pouring a resinous material into gaps defined between the
respective magnet-retaining apertures and the respective permanent magnets, the mold comprising:
a cavity for accommodating the rotor core at a predetermined position, with the rotor core receiving the permanent magnets
individually in the magnet-retaining apertures, respectively; and
a deformation inhibiting surface provided in said cavity for coming into at least local contact with an outer circumferential
surface of the rotor core, during a period when the resinous material is poured into the gaps, to inhibit a bulging deformation
of the outer circumferential surface of the rotor core;
wherein said deformation inhibiting surface is securely provided as an annular inner circumferential surface of said cavity.
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