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US 2006/0125345 A1Published application
Direct current motor
OwnerCheol-Gyun Leeinventor
Life of this patent
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Abstract
At least some portions of the rotator core are formed with non-magnetic materials to decrease the inductance of the coils of the rotator. This minimizesthe generation of a spark between the commutator and brush, thereby improving the durability of the brush and commutator. The cogging torque is also preventedby decreasing the magnetic flux density of the rotator, thus reliably reducing noise and vibration of the motor.
Claims5
A direct current motor, comprising:
- a case;
- a stator including a stator core, fixed in said case, and a plurality of permanent magnets fitted in said stator core;
- a brush electrically coupled to an external power source;
- a commutator electrically coupled to said brush and configured to commutate a current provided from said external power source by interacting with said brush;
- and
- a rotator including a rotational shaft rotatably mounted to said case, a rotator core fixed to said rotational shaft, and one or more coils that electrically connect to said commutator and wind around said rotator core, wherein at least some portions of said rotator core are made of non-magnetic materials.
3 more elements
Dependencies are inferred from the claim text.