Nidec Corporation

Naohiro Hashizume

Yusuke Makino

Takahiro Hiwa

Shohei Osuga

A motor may include a rotor comprising a shaft; a stator; and a bearing supporting the shaft. The rotor may include a plurality of core piece parts arranged along a circumferential direction; and a plurality of permanent magnets arranged between neighboring core piece parts. The permanent magnets may include two magnetic poles, and the magnetic poles of neighboring permanent magnets being arranged such that magnetic poles with identical polarity face each other in the circumferential direction. The core piece parts may include a concave portion, and two protrusions which are disposed on both sides of the concave portion and protrude radially inward. The protrusions may a portion located on a radially inner side from the first segment when viewed in an axial direction.

Motor

A motor includes an armature core having m&#xd7;n teeth (m is an odd number &#x2267;3, and n is a natural number &#x2267;2), a plurality of coils, and a commutator. The motor further includes field magnets including 2n magnetic poles and at least a first-potential brush and at least a second-potential brush. The commutator includes a segment group defined by 2m&#xd7;n segments. Only the coil defined by winding a continuous conducting wire in a predetermined winding direction is disposed in each of k teeth among the m&#xd7;n teeth, and only the coil defined by winding the continuous conducting wire in a direction reverse to the predetermined winding direction is disposed in each of teeth disposed at a position separated from each of the k teeth at 360&#xd7;i degrees (i is a natural number &#x2266;(n&#x2212;1)) of electric angles.

Growing community of inventors

Kyoto, Japan

Naohiro Hashizume