| 摘要 |
An electric motor includes a yoke having a plurality of magnetic poles, a rotary shaft, an armature core (8) attached to the rotary shaft, the armature core (8) having a plurality of teeth (12) and slots (13), an armature coil (9) wound on the teeth (12) through an intensive winding method, a commutator having a plurality of segments (15) installed at the rotary shaft and disposed in a circumferential direction, a low speed brush (21a) and a high speed brush (21b) configured to supply power to the armature coil (9) via the segments (15), and a common brush (21c) commonly used in these brushes, wherein, when n is a natural number of 3 or more, a ratio of the numbers of magnetic poles, slots (13), and segments (15) is set to 2:3:3n. |
| 主权项 |
1. An electric motor comprising:
a yoke having a plurality of magnetic poles; a rotary shaft rotatably installed inside the yoke; an armature core attached to the rotary shaft, the armature core having a plurality of teeth radially extending in a radial direction thereof and a plurality of slots formed between the teeth; a coil wound on each of the teeth through an intensive winding method; a commutator installed at the rotary shaft adjacent to the armature core and having a plurality of segments disposed in the circumferential direction; and three brushes constituted by a low speed brush and a high speed brush configured to supply power to the coil via the segments and a common brush commonly used for the brushes, wherein, when n is a natural number of 3 or more, a ratio of the numbers of magnetic poles, slots, and segments is set to 2:3:3n.
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