Brushless motor and winding method for stator
AssigneeShinano Kenshi Co., Ltd.
InventorHiroyuki KOBAYASHI
Life of this patent
Estimating the term…
Abstract
To provide a brushless motor in which a coil winding can be wound uniformly even when there is a difference in the distance between tooth tips of a plurality of pole teeth disposed in the circumferential direction of an annular part of a stator core so as to project in the radial direction. A guide core in which the distance between adjacent tooth tips of pole teeth is uniform and the tooth tips are symmetric with respect to the shaft lines in the radial direction is laminated integrally with a stator core in which a plurality of pole teeth is disposed in the circumferential direction of an annular part so as to project in the radial direction, and the distance in the circumferential direction between adjacent tooth tips is not uniform.
Claims9
A brushless motor comprising:
- a stator having a stator core provided with a plurality of stator pole teeth around which coils are formed;
- and
- a rotor having a rotor shaft rotatably supported via a bearing, the rotor shaft being provided at the center of a rotor yoke having a plurality of rotor magnets facing the stator pole teeth,
- wherein a guide core is laminated integrally with the stator core, the guide core having a plurality of pole teeth provided with a plurality of tooth tips symmetric with respect to shaft lines in a radial direction, a distance between the adjacent tooth tips being uniform, the stator core having the stator pole teeth in a circumferential direction of an annular part so as to project in the radial direction, the stator pole teeth having a plurality of tooth tips, a distance between the adjacent tooth tips being not uniform.
A winding method for a stator comprising:
- a first process of preparing a composite core in which a guide core having a plurality of pole teeth disposed in a circumferential direction of an annular part is assembled integrally to a stator core having a plurality of pole teeth disposed in a circumferential direction of an annular part so as to project in a radial direction so that the pole teeth and the pole teeth are superimposed on each other, the pole teeth of the guide core having tooth tips symmetric with respect to shaft lines in a radial direction, a distance between the adjacent tooth tips being uniform, the stator core having a plurality of tooth tips, a distance between the adjacent tooth tips being not uniform;
- a second process of clamping both sides in the circumferential direction of the tooth tip of the guide core and clamping both ends in a lamination direction of the pole teeth around which a coil is formed at a predetermined position in the radial direction so as to cover the pole teeth adjacent to both sides with a side former when the composite core is fixed to a rotatable support table and the pole teeth is positioned by a center former of a wire winding machine;
- a third process of rotating a rotary cylindrical body while a magnet wire is held in a nozzle provided in the rotary cylindrical body, causing the magnet wire to enter an open slot through a clearance formed between the center former and the side former, and winding the magnet wire around the pole teeth;
- a fourth process of repeatedly winding the magnet wire around the pole teeth by further rotating the rotary cylindrical body while moving the center former in the radial direction of the pole teeth by one pitch until the coil is formed around the pole teeth;
- and
- a fifth process of repeatedly applying the second to fourth processes to a next pole tooth of the stator core by rotating the support table at a predetermined angle while moving the center former away from the pole tooth until the coil is formed for all of the pole teeth.
Dependencies are inferred from the claim text.