JPH08182238A - Stator - Google Patents

Abstract

PURPOSE: To effectively reduce current loss by making the current density uniform. CONSTITUTION: The three-phase stator 12 comprises a stator core 16, and three- phase waving windings 18a-18c being set thereon. The waving winding 18a-18c is provided, at the intermediate coil end 24a-24c being led out between the slots 22, with a twisted part 26a-26c for transposition. Consequently, the current density is made uniform and current loss is reduced effectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator having corrugated windings arranged in slots of a stator core.

[0002]

2. Description of the Related Art For example, a motor used in an electric vehicle is generally provided with a stator core (stator core) provided with windings corresponding to a predetermined number of phases and a plurality of permanent magnets provided on an outer peripheral surface. And a rotor disposed rotatably in the stator core.

This type of stator core is usually constructed by integrally bonding a plurality of laminated steel plates, and a plurality of strands, for example, a plurality of strands, are provided in a plurality of slots provided on the inner peripheral surface of the stator core. A corrugated winding, which is a continuous coil formed by bundling enameled wires, is provided.

[0004]

By the way, generally, in a transformer, when an alternating current passes through a plurality of conductors, an induced voltage is generated by a leakage magnetic flux, the current density becomes uneven depending on the position of the wire, and the resistance increases. It is known that current loss increases.

On the other hand, the above-mentioned motor is similar to the transformer in that a large current flows and a thin bundled wire is used, and this transformer has a commercial frequency (50H).
z, 60Hz), but 900H at an alternating frequency
It has been pointed out that there is a problem that z (at 6000 rpm) is more likely to be affected by the leakage magnetic flux than the transformer.

The present invention is intended to solve this type of problem, and an object of the present invention is to provide a stator capable of making current density uniform and effectively preventing current loss.

[0007]

In order to achieve the above-mentioned object, the present invention is a stator in which a corrugated winding consisting of a continuous coil in which a plurality of strands are bundled is arranged in a slot of a stator core. Further, the corrugated winding is characterized in that a twist end portion for dislocation is provided at a coil end led out between the slots.

[0008]

In the stator according to the present invention, the dislocation is performed by providing the twisted portion at the coil end of the corrugated winding. Therefore, the current density of the stator is made uniform, the current loss is effectively reduced, and a motor that can be used efficiently can be provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A stator according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a motor. The motor 10 includes a three-phase stator 12 and a rotor 14 rotatably arranged in the three-phase stator 12.

The three-phase stator 12 includes a stator core 16
And three-phase wave windings 18a to 18c arranged on the stator core 16. The stator core 16 is formed by integrally laminating a plurality of laminated steel plates 20, and a plurality of slots 22 for disposing the corrugated windings 18a to 18c on the inner peripheral surface of the stator core 16.
Are spaced apart by a predetermined angle and are arranged in parallel in the axial direction (direction of arrow A).

The corrugated windings 18a-18c have slots 22
Twisted portions 26a to 26c for dislocation are provided on intermediate coil ends 24a to 24c led out in between. Specifically, as shown in the development view of FIG.
No. 54 slots 22 designated by 1 to 54 are provided. Waveform winding 18a has a coil end 24a ₁ ~24a ₉ of 9 derived in one of the stator core 16,
By forming the twist-shaped portion 26a of the curved portion of the intermediate coil ends 24a ₅ twisted 180 °, the same number before and after the coil end 24a ₅ (A zone and B zone) (9
Slots 22) are inserted in the slots 22 (in each slot) in a mutually inverted state (see pattern 1). Other wave winding 18
b and 18c are the same as the corrugated winding 18a.
It is inserted into the same number of slots 22 before and after 6b and 26c.

Further, as shown in pattern 2 in FIG.
It may form a twist shape portion 26a to the coil end 24a _2, 24a ₅ and 24a ₈ waveforms winding 18a, as further shown in pattern 3, all of the coil end 24a ₁ ~24a ₉ of this waveform winding 18a Twisted portion 26a
May be formed.

As shown in FIG. 1, the rotor 14 includes a shaft 28, a yoke 30, and a plurality of permanent magnets 32 which are arranged on the outer peripheral surface of the yoke 30 at predetermined intervals.

Next, an operation of assembling the motor 10 having the above structure will be described.

First, the corrugated winding 18a is formed by a continuous coil in which a plurality of enameled wires (strands) 34 are bundled. Then, in the coil end 24a corresponding to the inner curved portion of the corrugated winding 18a, the intermediate coil end 24a is twisted by 180 ° to form a twisted portion 26a (FIG. 3).
reference).

Specifically, in the waveform winding 18a shown in FIG. 2, a portion before or after the coil end 24a ₅ ,
For example, the work of switching the upper and lower sides of the enamel wire 34 is performed by turning over the entire portion of the coil end 24a ₅ and thereafter (section B). Thereby, before and after the intermediate coil end 24a (section A and section B),
As shown in FIGS. 4A and 4B, the alignment order of the enameled wires 34 is reversed.

Therefore, as shown in FIG.
In a state in which a is locked to each blade 42 of the insert jig 40, the punch 44 constituting the insert jig 40 is formed.
Are introduced into the insert jig 40. For this reason,
The corrugated winding 18a is arranged in a predetermined slot 22 of the stator core 16 with its corrugated shape reversed.

At this time, the twist-shaped portion 26a formed on the coil end 24a in the middle of the corrugated winding 18a is arranged corresponding to the inner side of the blade 42 of one because it is located at the curved portion of the coil end 24a. ing. Therefore, the position of the twisted portion 26a does not shift, and the waveform winding 18a
Uses the twisted portion 26a as an intermediate coil end 24a.
It is arranged in a predetermined slot 22 of the stator core 16 while maintaining the predetermined position.

Here, the corrugated winding 18a is disposed in the slot 22 of the stator core 16 with one turn, but the corrugated winding 18a can be disposed with a plurality of turns, for example, three turns.

Similarly, the corrugated windings 18b and 18c are sequentially arranged in the other slots 22 of the stator core 16 via the insert jig 40. This allows the waveform winding 1
8a-18c are arrange | positioned at the stator core 16 and the three-phase stator 12 is comprised (refer FIG. 1).

In this case, in this embodiment, the waveform winding 18a
By twisting the intermediate coil end 24a of the corrugated windings 18b and 18c by 180 ° to form the twisted shape portion 26a, the alignment order of the enamel wire 34 is reversed before and after the twisted shape portion 26a. As the rearrangement takes place,
Before and after the coil end 24a, there are provided A sections and B sections to be inserted into the same number of slots 22 (see FIG. 2). For this reason, it is possible to cancel the induced voltage due to the leakage magnetic flux in the slot 22 to make the current density uniform, effectively reduce the current loss, and obtain an efficient motor 10.

In the coil end 24a, the enamel wires 34 on both ends, which form a twisted portion 26a and are diagonal lines, may be set longer than the enamel wire 34 on the center side. As a result, the coil end 24a becomes 180
Both ends of the coil end 24a are not pulled in a twisted state, and the alignment of the enamel wire 34 can be easily maintained.

In the present embodiment, the intermediate coil end 24a is twisted by 180 ° to form the twisted portion 26a. For example, as shown in FIG. 6A, the coil end 24a is held by a holding jig 48, It may be bent at a diagonal 50 through 48. In the coil end 24a, all the enameled wires 34 are bent at an angle of θ, as shown in FIG.
In the state shown in B, the predetermined slot 2 of the stator core 16
2 are arranged.

The coil end 24a shown in FIG.
Bending portions 52a and 52b are provided at a plurality of positions, and the coil end 24a shown in FIG. 8 is once translated and then bent at a diagonal line 54. Further, the coil end 24a shown in FIG. 9 is formed into a linear strip shape by bending both ends 56a and 56b in parallel and then bending the straight line 58. In either case, the rearrangement is effectively performed,
It becomes possible to provide the efficient motor 10.

[0026]

According to the stator of the present invention, the following effects and advantages can be obtained.

Since the twisted portion is provided at the coil end of the corrugated winding to effect the dislocation, the current density is made uniform,
The current loss is effectively reduced. This makes it possible to provide a motor that can be used efficiently.

[Brief description of drawings]

FIG. 1 is an exploded explanatory view showing a schematic configuration of a motor incorporating a stator according to the present invention.

FIG. 2 is a development view for explaining a relationship between a wave winding and a slot that form the stator.

FIG. 3 is a perspective explanatory view of the waveform winding.

4A and 4B are explanatory views of an arrangement state of an enamel wire forming the waveform winding, FIG. 4A is a cross-sectional view taken along line IVA-IVA in FIG. 3, and FIG. 4B is a cross-section taken along line IVB-IVB in FIG. It is a figure.

FIG. 5 is an explanatory diagram when the corrugated winding is inserted into the stator core by the insert jig.

6A and 6B are explanatory views when the corrugated winding is bent diagonally, FIG. 6A is an explanatory view of the corrugated winding bent, and FIG. 6B is a state where the corrugated winding is arranged in a slot. FIG.

FIG. 7 is an explanatory diagram of a state in which the corrugated winding is bent at a plurality of places.

FIG. 8 is an explanatory diagram of a state in which the corrugated winding is once translated and then bent.

FIG. 9 is an explanatory diagram showing a state in which the corrugated winding is moved in parallel at two places and then bent.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Motor 12 ... Three-phase stator 14 ... Rotor 16 ... Stator core 18a-18c ... Waveform winding 22 ... Slot 24a-24c ... Coil end 26a-26c
… Twisted part 34… Enamel wire 40… Insert jig

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoaki Momose 1-10-1 Shin-Sayama, Sayama-shi, Saitama Honda Engineering Co., Ltd.

Claims (2)

[Claims] 1. A stator in which a corrugated winding formed of a continuous coil in which a plurality of strands are bundled is disposed in a slot of a stator core, wherein the corrugated winding is a coil end led out between the slots. A stator characterized in that a twist-shaped portion for dislocation is provided in the stator. 2. The stator according to claim 1, wherein the twist-shaped portion is provided on a curved portion of the coil end.