Rotor unit, rotating electrical machine, and method for manufacturing rotor unit
AssigneeNidec Corporation
InventorsHidehiro Haga, Tatsuro Kawamoto, Shunsuke Murakami
Life of this patent
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Abstract
A rotor unit includes a rotor core made of laminated steel sheets that are vertically laminated, and a holder made of resin. The rotor core and the holder are fixed together through insert molding. For this reason, the process of manufacturing the rotor core and the holder is shortened. Additionally, in the outer peripheral surface of the rotor core, a portion of resin that defines the holder is present between the plurality of steel sheets that defines the rotor core. For this reason, the fixing strength of the rotor core and the holder improves. Additionally, since a separation between the rotor core and the holder is prevented, magnets can be easily press-fitted.
Claims13
A rotor unit for a rotating electrical machine comprising:
- an annular rotor core including laminated steel sheets that are laminated in a vertical direction;
- a plurality of magnets arranged in a circumferential direction around the rotor core;
- and
- a holder made of resin that is arranged to hold the plurality of magnets;
- wherein
- the holder includes a plurality of partitioning portions that extends in the vertical direction along an outer peripheral surface of the rotor core, and a coupling portion that connects the plurality of partitioning portions;
- the rotor core and the holder are made of insert molded material so as to be fixed together;
- a portion of resin that defines the holder is present between the plurality of steel sheets that defines the rotor core in the outer peripheral surface of the rotor core;
- one of the plurality of magnets is press-fitted into a pair of the plurality of partitioning portions that are mutually adjacent;
- each of the plurality of partitioning portions includes:
- a columnar portion located between a pair of the plurality of magnets that are mutually adjacent;
- and
- a wall portion that partially covers a radial outside surface of the pair of the plurality of magnets;
- and
- an inner peripheral surface of the wall portion includes an inclined surface that gradually approaches the outer peripheral surface of the rotor core as the inclined surface extends downward in the vertical direction from an upper end of the rotor core in the vertical direction.
A rotor unit for a rotating electrical machine, comprising:
- an annular rotor core including, a plurality of laminated steel sheets that are laminated in a vertical direction;
- a plurality of magnets arranged in a circumferential direction around the rotor core;
- and
- a holder made of resin that is arranged to hold the plurality of magnets;
- wherein
- the holder includes a plurality of partitioning portions that extends in the vertical direction along, an outer peripheral surface of the rotor core, and a coupling portion that connects the plurality of partitioning portions;
- the rotor core and the holder are made of insert molded material so as to be fixed together;
- a portion of resin that defines the holder is present between the plurality of steel sheets that defines the rotor core in the outer peripheral surface of the rotor core;
- one of the plurality of magnets is press-fitted into a pair of the plurality of partitioning portions that are mutually adjacent;
- and
- ends of the plurality of steel sheets are curved toward an upper side of the rotor core in the vertical direction in a vicinity of the outer peripheral surface of the rotor core.
A method of manufacturing a rotor unit for a rotating electrical machine including an annular rotor core including laminated steel sheets that are laminated in a vertical direction, a plurality of magnets arranged in a circumferential direction around the rotor core, and a holder made of resin that holds the plurality of magnets, the method comprising:
- a) arranging the rotor core inside a mold, and injecting resin in a fluid state into the mold to insert-mold the holder, wherein a plurality of partitioning portions that extends in the vertical direction along an outer peripheral surface of the rotor core, and a coupling portion that connects the partitioning portions are formed by insert molding;
- and
- b) a magnet of the plurality of magnets is press-fitted to a pair of the plurality of partitioning portions that are mutually adjacent after step a), wherein
- in step a), the plurality of partitioning portions is molded in a shape including a columnar portion located between ones of the plurality of magnets that are mutually adjacent, and a wall portion that partially covers radial outside surfaces of the ones of the plurality of magnets that are mutually adjacent;
- and
- an inclined surface that gradually approaches the outer peripheral surface of the rotor core extends downward in the vertical direction from an upper end of the rotor core in the vertical direction is molded on an inner peripheral surface of the wall portion.
Dependencies are inferred from the claim text.