Dc motor
AssigneeMabuchi Motor Co., Ltd.
InventorYusuke MIYAJIMA
Life of this patent
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Abstract
A DC motor comprises: a tubular metal case; a magnet that is provided along the inner surface of the metal case and has four or more of magnet poles in the circumferential direction; an armature that is arranged to face the magnet and composed of a core and a coil; and a shaft. The magnet is formed of a material with a maximum energy product BHmax of 3 to 6 MGOe. When the thickness of the magnet in the radial direction of the armature is indicated by T [mm] and the outer diameter of the core is indicated by d [mm], the ratio T/d of the thickness T of the magnet to the outer diameter d of the core is 0.16 or more.
Claims16
A DC motor comprising:
- a yoke;
- a magnet that is provided along the inner surface of the yoke and has four or more of magnet poles in the circumferential direction;
- an armature that is arranged to face the magnet and composed of a core and a coil;
- a shaft that is fixed by being inserted along the rotating shaft of the armature;
- and
- a commutator that is attached to the shaft so as to be coaxial with the armature;
- wherein
- the magnet is formed of a material with a maximum energy product BHmax of 3 to 6 MGOe, and wherein
- when the thickness of the magnet in the radial direction of the armature is indicated by T [mm] and the outer diameter of the core is indicated by d [mm], the ratio T/d of the thickness T of the magnet to the outer diameter d of the core is 0.16 or more.
Dependencies are inferred from the claim text.