Brushless motor
AssigneeMabuchi Motor Co., Ltd.
InventorYuuichirou Matsuoka
Life of this patent
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Abstract
A brushless motor includes: a rotor including a magnet; and a stator including at its center a space for placing the rotor. The rotor includes: a rotor core; and a plurality of magnets. The rotor core includes a plurality of magnet holders radially formed around a rotating shaft. The magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core, and the stator includes a plurality of teeth formed toward the center to face the rotor. Given that a radius of curvature of an outer circumference of the rotor core is R, a width of an end of the teeth in a circumferential direction is W, and a maximum outer diameter of the rotor core is L, 0.9≦R/W≦4.2 and R<L/2 are met.
Claims16
A brushless motor comprising:
- a rotor including a magnet;
- and
- a stator including at its center a space for placing the rotor, wherein
- the rotor includes:
- a rotor core;
- and
- a plurality of magnets, wherein
- the rotor core includes a plurality of magnet holders radially formed around a rotating shaft,
- the magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core,
- the stator includes a plurality of teeth formed toward the center to face the rotor, and
- given that a radius of curvature of an outer circumference of the rotor core is R, a width of an end of the teeth in a circumferential direction is W, and a maximum outer diameter of the rotor core is L, 0.9≦R/W≦4.2 and R<L/2 are met.
A brushless motor comprising:
- a rotor including a magnet;
- and
- a stator including at its center a space for placing the rotor, wherein
- the rotor includes:
- a rotor core;
- and
- a plurality of magnets, wherein
- the rotor core includes a plurality of magnet holders radially formed around a rotating shaft,
- the magnets are housed in the magnet holders such that the same magnetic poles of adjacent magnets face each other in a circumferential direction of the rotor core,
- given that a maximum outer diameter of the rotor is L and a width of the magnet in a radial direction is Y, 0.37≦Y/(L/2)≦0.62 is met.
Dependencies are inferred from the claim text.