Direct current motor
AssigneeToshiba Tec Kabushiki Kaisha
InventorsMotoyuki Tanaka, Masaki Miyoshi, Fumikiyo Nakazawa, Osamu Sakurai, Tsugiyoshi Ono
Life of this patent
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Abstract
Field magnets are attached to an inner periphery of a stator core, which defines a rotor through hole. The stator core has a plurality of recesses open to the rotor through hole. Each recess faces magnet end portions of the field magnets. The recess surface of the recess is away from the surface AC of the magnet end portion and set back toward an outer periphery of the stator core from a rear surface AD of the magnet end portion.
Claims8
A motor of an inner-rotor type driven by a direct-current power supply, comprising:
- a stator including a stator core with a rotor through hole in a central portion and a plurality of recesses open to the rotor through hole, and a plurality of field magnets which are attached to an inner periphery defining the rotor through hole and generate a magnetic field, each recess facing a magnet end portion of a field magnet and having a recess surface which is away from a surface of the magnet end portion and set back toward an outer periphery of the stator core from a rear surface of the magnet end portion;
- a motor frame which supports the stator;
- and
- a rotor passed through the rotor through hole and rotatably supported by the motor frame.
A motor of an inner-rotor type driven by a direct-current power supply, comprising:
- a stator core formed of a stack of a number of core plates and having a rotor through hole in a central portion, and a plurality of field magnets which are formed by injection molding synthetic resin, with which magnetic particles are mixed, to an inner periphery defining the rotor through hole and which generate a magnetic field;
- a motor frame which supports the stator;
- and
- a rotor passed through the rotor through hole and rotatably supported by the motor frame.
Dependencies are inferred from the claim text.