JPH0347423Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stator for a brushless motor.

[Conventional technology and its problems]

In brushless motors, when downsizing the motor, it is required to make the outer diameter of the stator as small as possible, but due to the rotation axis, etc.
In addition to making the axial center hole of the stator as large as possible, it is necessary to make the coil winding part of the stator 2 as large as possible since the coil is wound around the stator. If it is set to a small value, the core back portion of the stator becomes small, and due to magnetic saturation, it becomes impossible for magnetic flux to pass therethrough, which may reduce the performance of the motor.

This invention solves these conventional problems and
It is an object of the present invention to provide a stator for a brushless motor that can be made as small as possible without deteriorating the performance of the motor.

[Means for solving problems]

The stator of the brushless motor of the present invention has a stator body made of a magnetic material, which has an axial hole and a plurality of slots, and a coil is wound around the teeth between the slots; and an annular core back forming member made of a magnetic material that is polymerized on one or both surfaces of the annular base of the stator body from the part to the axial hole.

[Effect]

With the above configuration, even if the width of the annular base from the coil winding part of the slot and teeth to the shaft center hole is set small, the core back forming member is superimposed on this annular base, so magnetic flux can pass through it. A core back portion having the necessary cross-sectional area is ensured.

〔Example〕

Hereinafter, the present invention will be explained in detail based on drawings showing embodiments.

In FIGS. 1 and 2, reference numeral 1 denotes a stator used in a brushless motor and made of a magnetic material around which coils 2 are wound, and which has a stator body 5 having an axial hole 3 and a plurality of slots 4. and a thin plate-shaped annular core back forming member 6 made of a magnetic material and superimposed on the stator main body 5.

In the illustrated example, the stator main body 5 has six slots 4 formed at every 60 degrees central angle, and six slots 4 formed by forming the slots 4 and facing closely to the rotor (not shown). It is equipped with 7... And the 7th...
The coils 2 are wound around the coil winding portions 8. The stator body 5 is formed by laminating thin plate-like stator laminations 9 made of magnetic material as shown in FIG. That is, the stator lamination 9 has six slots 4a at each central angle of 60 degrees.
... and six teeth 7a formed by forming the slots 4a. 3a is an axial hole of the stator lamination 9. In addition, in the illustrated example, the stator body 5
is formed by laminating three stator laminations 9 in a polymerized manner.

Thus, the annular core back forming member 6 is superimposed on one or both surfaces of the annular base 10 from the slots 4 and the coil winding portions 8 to the shaft hole 3 of the stator body 5. (In the example shown, three sheets are polymerized on each side.) In addition, the above-mentioned magnetic materials include:
The material should be silicon steel or a high permeability material with magnetic properties equivalent to silicon steel.

Therefore, the stator 1 configured as described above is
Even when the width dimension of the annular base portion 10 of the stator body 5 is set short, the core back portion 11 having a cross-sectional area necessary for passing the magnetic flux generated from the coil 2 can be secured by overlapping the core back forming members 6. .

The present invention is not limited to the illustrated embodiment, and the design may be changed without departing from the gist of the present invention. For example, the number of slots 4 and teeth 7 in the stator body 5 may be freely increased or decreased. The core back forming member 6 superposed on the annular base 10 of the main body 5 can be increased or decreased as desired, and the annular base 10
Of course, polymerization on only one side is also free. Furthermore, the stator laminations 9 forming the stator body 5 can be increased or decreased as desired. In the illustrated example, the number of turns of the coil 2 is simplified, and in reality, a large number of turns are provided.

[Effect of idea]

In the stator of the brushless motor of the present invention, even when the width dimension of the annular base 10 of the stator body 5 is set short, it is possible to secure the core back portion 11 having a cross-sectional area necessary for passing the magnetic flux generated from the coil 2. Therefore, if the width of the annular base 10 is set short and the outer diameter of the stator 1 is set small, the motor can be made as small as possible without deteriorating its performance. can. Also, if necessary, the core back forming member 6
By changing the number of polymers, the cross-sectional area of the core back portion 11 can be changed, so the size of the motor can be set as required.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention;
FIG. 2 is a sectional view, and FIG. 3 is a plan view of the stator laminations forming the stator body. 2... Coil, 3... Axial hole, 4... Slot, 5... Stator body, 6... Core back forming member, 7... Teeth, 8... Coil winding part, 1
0...Annular base.

Claims (1)

[Claims for Utility Model Registration] It has an axial hole 3 and a plurality of slots 4, and a coil 2 is attached to the teeth 7 between the slots 4.
Stator body 5 made of magnetic material around which... is wound
and an annular core back forming member 6 made of a magnetic material that is superposed on one or both surfaces of the annular base 10 of the stator body 5 from the coil winding portions 8 of the slots 4 and teeth 7 to the shaft hole 3. A stator for a brushless motor, comprising: and.