Importance

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Abstract

A DC motor has a stator including two magnets arranged in a circumferential direction. An armature includes an armature core having eight slots arranged in a circumferential direction and radially facing the magnets. A commutator rotates integrally with the armature core and includes four segments separated in the circumferential direction by four grooves arranged in the circumferential direction. Coils are wound in a distributed winding in the slots. Two brushes contact the segments. Two coils, which are arranged at an interval of electric angle 180° and connected in series to each other, are connected to two of the segments that are electrically short circuited by each of the brushes so that the two coils extend between the segments. Each groove is located at a position deviated from a position separated by electric angle 180° in the circumferential direction from another one of the grooves.

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First Claim