Patent ID: 7500848
Filing Date: 2009-03-10
Classification: H02K,Y10T

Abstract:
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.