Motor, fan, and ventilation fan
AssigneeMitsubishi Electric Corporation
InventorsAtsushi Matsuoka, Junji Okada, Takuya Nakamura
Life of this patent
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Abstract
A motor includes a rotary shaft, a rotor fixed to the rotary shaft, a stator including a stator core surrounding the rotor in a radial direction about a center axis of the rotary shaft, and a coil wound on the stator core, a bearing supporting the rotary shaft, and a conducting member electrically connecting the stator core to an outer ring of the bearing. The rotor includes a facing portion formed of a bond magnet and facing the stator core in the radial direction, and an insulating joining portion joining the facing portion and the rotary shaft. A length L1 of the facing portion in an axial direction of the rotary shaft is equal to or shorter than a length L2 of the stator core in the axial direction.
Claims17
A motor comprising:
- a rotary shaft;
- a rotor fixed to the rotary shaft;
- a stator comprising a stator core surrounding the rotor in a radial direction about a center axis of the rotary shaft, and a coil wound on the stator core;
- a bearing having an inner ring and an outer ring, the inner ring being in contact with the rotary shaft;
- and
- a conducting member electrically connecting the stator core to the outer ring and being grounded,
- wherein the rotor comprises:
- a facing portion facing the stator core in the radial direction;
- and
- an insulating joining portion joining the facing portion and the rotary shaft,
- wherein the facing portion includes a first magnet portion formed of a ferrite bond magnet and a second magnet portion formed of a rare-earth bond magnet and provided on an outer periphery of the first magnet portion,
- wherein a length L1 of the facing portion in an axial direction of the rotary shaft is equal to or shorter than a length L2 of the stator core in the axial direction.
A motor comprising:
- a rotary shaft;
- a rotor fixed to the rotary shaft;
- a stator comprising a stator core surrounding the rotor in a radial direction about a center axis of the rotary shaft, and a coil wound on the stator core;
- a bearing having an inner ring and an outer ring, the inner ring being in contact with the rotary shaft;
- and
- a conducting member electrically connecting the stator core to the outer ring and being grounded,
- wherein the rotor comprises:
- a facing portion formed of a bond magnet and facing the stator core in the radial direction;
- and
- an insulating joining portion joining the facing portion and the rotary shaft, and
- wherein a length L1 of the facing portion in an axial direction of the rotary shaft is equal to or shorter than a length L2 of the stator core in the axial direction,
- wherein the facing portion includes a first magnet portion formed of a ferrite bond magnet and a second magnet portion formed of a rare-earth bond magnet and provided on an outer periphery of the first magnet portion, and
- wherein the insulating joining portion is formed of a material with a permittivity lower than that of the facing portion.
Dependencies are inferred from the claim text.