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US 7,608,959 B2Granted
Brushless motor
AssigneeNidec Corporation
InventorsNakaba Kataoka, Keita Nakanishi, Yoshiaki Yamashita
Life of this patent
Estimating the term…
Abstract
In an armature for a brushless motor, a gap is provided between an inner circumferential surface of a cylinder portion of a cover and an outer circumferential surface in a radial direction of the armature. A plurality of non-magnetic spacers having a predetermined distance therebetween are provided in a circumferential direction so as to make contact with the inner circumferential surface of the cylinder portion and the outer circumferential surface of the armature.
Claims31
A brushless motor comprising:
- an armature including an annular core back having a substantially cylindrically shaped outer circumferential surface which extends along a central axis, a plurality of teeth each extending from the core back toward the central axis and having an end surface facing the central axis, and a coil formed by winding a conducting wire around each tooth;
- a cover including a cylinder portion whose inner diameter is greater than an outer diameter of the annular core back, and for covering the armature from radially outside thereof;
- a plurality of spacers each having a surface making contact with the outer circumferential surface of the annular core back and a surface making contact with an inner circumferential surface of the cylinder portion;
- a rotor, located radially nearer to the central axis than the tooth of the armature, for generating, due to an interaction between the tooth and rotor, a rotary drive force;
- and
- a bearing portion for supporting the rotor in such a manner that the rotor is allowed to rotate freely.
3 more elements
A brushless motor comprising:
- an armature including an annular core back having a substantially cylindrical shaped outer circumferential surface which extends along a central axis, a plurality of teeth each extending from the core back toward the central axis and having an end surface facing the central axis, and a coil formed by winding a conducting wire around each tooth;
- a cover including a cylinder portion whose inner diameter is greater than an outer diameter of the annular core back for covering the armature from radially outside thereof, and a radial direction reduced portion, connectedly provided to one axial end of the cylinder portion, an inner circumferential surface thereof making contact with the outer circumferential surface of the core back;
- a rotor, located radially nearer to the central axis than the tooth of the armature, for generating, due to an interaction between the tooth and rotor, a rotary drive force;
- a bearing portion for supporting the rotor in such a manner that the rotor is allowed to rotate freely;
- a plurality of armature contact portions located in a circumferential direction and having a predetermined distance therebetween;
- upper portions of the plurality of armature contact portions defining a spacer having a surface in contact with the outer circumferential surface of the core back and a surface in contact with an inner circumferential surface of the cylinder portion;
- and
- a connection mechanism having a conductor located at one end of the armature in the axial direction, the conductor arranged to connect end portions of the coil;
- wherein
- the armature contact portions retain the conductor to determine a position of the connection mechanism with respect to the axial direction.
7 more elements
A brushless motor comprising:
- an armature including an annular core back having a substantially cylindrically shaped outer circumferential surface which extends along a central axis, a plurality of teeth each extending from the core back toward the central axis and having an end surface facing the central axis, and a coil defined by a conducting wire wound around each tooth;
- a cover including a cylinder portion having an inner diameter that is greater than an outer diameter of the annular core back, and arranged to cover the armature from radially outside thereof;
- a plurality of spacers each having a surface in contact with the outer circumferential surface of the annular core back and a surface in contact with an inner circumferential surface of the cylinder portion;
- a rotor, located radially nearer to the central axis than the tooth of the armature, to generate a rotary drive force produced by an interaction between the tooth and rotor;
- a bearing portion arranged to support the rotor in such a manner that the rotor is allowed to rotate freely;
- a plurality of armature contact portions located in a circumferential direction and having a predetermined distance therebetween;
- upper portions of the plurality of armature contact portions defining a spacer having a surface in contact with the outer circumferential surface of the core back and a surface in contact with the inner circumferential surface of the cylinder portion;
- and
- a connection mechanism having a conductor located at one end of the armature in the axial direction, the conductor arranged to connect end portions of the coil;
- wherein
- the armature contact portions retain the conductor to determine a position of the connection mechanism with respect to the axial direction.
8 more elements
Dependencies are inferred from the claim text.