JPH08182239A - Stator - Google Patents

Abstract

PURPOSE: To effectively reduce current loss by making the current density uniform. CONSTITUTION: The stator comprises a stator core 16, and three-phase waving windings 18a-18c being set thereon. The waving winding 18a-18c is provided with an intermediate coil end 24 being led out between the slots 22. The coil end 24 comprises a pair of linear parts 26a, 26b, and a curved part 28 formed integrally therewith wherein the pair of linear parts 26a, 26b are provided with twisted part 30a, 30b for transposition and inverted from each other.

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. Then, the coil end of the waveform winding led out between the slots has a pair of linear portions extending from the end surfaces of the respective stator cores, and a curved portion integrally provided on the pair of linear portions, The pair of linear portions are each provided with a twist-shaped portion for dislocation and are inverted with respect to each other.

[0008]

In the stator according to the present invention, the pair of straight portions forming the coil end of the corrugated winding are inverted with respect to each other to cause the dislocation. Therefore, the current density of the stator is made uniform and the current loss is reduced. In addition, since each linear portion of the coil end is twisted at a predetermined angle, for example, 90 °, the disconnection of the coil end can be effectively prevented as compared with the case where only one linear portion is twisted by 180 °. You can

[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 in order to arrange the corrugated windings 18a to 18c on the inner peripheral surface of the stator core 16, a plurality of, for example, , 54
Slots 22 are separated from each other by a predetermined angle and arranged in parallel in the axial direction (direction of arrow A).

The corrugated winding 18a is composed of a continuous coil in which a plurality of enameled wires (strands) 23 are bundled, and the corrugated winding 18a is provided with a coil end 24 led out between the slots 22. As shown in FIG. 2, the coil end 24 located in the middle of the corrugated winding 18a is integrally formed with the pair of linear portions 26a and 26b extending from the end surface of the stator core 16 and the pair of linear portions 26a and 26b. And a pair of linear portions 26a, 2
6b are provided with twisted portions 30a and 30b for dislocation, respectively, and are inverted with respect to each other.

Specifically, as shown in the development view of FIG.
The stator core 16 is No. 54 slots 22 designated by 1 to 54 are provided. The corrugated winding 18a has nine coil ends 24a to 2 which are led out to one side of the stator core 16.
4i, the pair of straight portions 26a, 26b of the intermediate coil end 24e are twisted by 90 ° each to form the twist-shaped portions 30a, 30b, so that the coil end 24e is in front of and behind (A section and B section). Then, they are inserted into the same number (9 slots each) of the slots 22 in a mutually inverted state (see pattern 1).

Further, as shown in pattern 2 in FIG.
Coil ends 24b, 24e and 2 of the corrugated winding 18a
4h may be formed with a pair of twisted portions 30a and 30b, respectively, and as shown in pattern 3, a pair of twisted portions 30a and 30b are provided on all the coil ends 24a to 24i of the corrugated winding 18a. It can also be formed.

The other waveform windings 18b and 18c are constructed in the same manner as the above-described waveform winding 18a, and the same components are designated by the same reference numerals and their detailed description will be omitted.

As shown in FIG. 1, the rotor 14 includes a shaft 32, a yoke 34, and a plurality of permanent magnets 36 which are arranged on the outer peripheral surface of the yoke 34 at predetermined intervals. .

Next, the work of assembling the motor 10 thus constructed will be described. The waveform winding 18
Since a to 18c are assembled in the same manner, the waveform winding 18a will be described in detail below, and description of the other waveform windings 18b and 18c will be omitted.

First, the corrugated winding 18a is formed by a continuous coil in which a plurality of enameled wires 23 are bundled. Then, in the coil end 24 corresponding to the inner curved portion of the wave winding 18a, the coil end 24e in the middle is inverted and the dislocation is performed.

Specifically, in the waveform winding 18a shown in FIG. 3, the straight portion 26a forming the coil end 24e is twisted by 90 ° from the middle of the straight portion 26a (section B) to the twisted portion 30a.
After the formation of the
The twisted portion 30b is formed on the straight portion 26b by being twisted. Accordingly, before and after the coil end 24e (section A and section B), as shown in FIGS. 4A and 4B,
The arrangement order of the enamel wires 23 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 disposed in a predetermined slot 22 of the stator core 16 by reversing the corrugated shape by 90 °.

The corrugated winding 18a is used for the stator core 1
Although the six winding slots 22 are provided with one turn, the corrugated winding 18a may be provided 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
The linear portions 26a and 26b forming the coil end 24 in the middle of the waveform windings 18b and 18c are also 90
Twisted portions 30a and 30b are formed by twisting each other. As a result, the arrangement order of the enameled wires 23 is reversed to cause dislocation, and A sections and B sections to be inserted into the same number of slots 22 before and after the coil end 24 are provided (see FIG. 3). Therefore, the effect that the induced voltage due to the leakage magnetic flux in the slot 22 is canceled to make the current density uniform and the current loss can be effectively reduced is obtained.

Moreover, in this embodiment, the coil end 24
The straight portions 26a and 26b are twisted by a predetermined angle, for example, 90 °. Therefore, unlike the one in which only one straight portion 26a (or 26b) is twisted by 180 °, the one straight portion 26a (or 26
It is possible to reliably prevent the occurrence of wire breakage due to bending of b). This has the advantage that the motor 10 that can be used efficiently can be provided.

[0025]

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

Since the pair of straight line portions forming the coil end of the waveform winding are inverted with respect to each other to perform the transposition, the current density of the stator is made uniform and the current loss is reduced.
In addition, since each linear portion of the coil end is twisted at a predetermined angle, for example, 90 °, the disconnection of the coil end can be effectively prevented as compared with the case where only one linear portion is twisted by 180 °. You can This allows
A motor that can be used efficiently can be provided.

[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 an explanatory diagram of a wave winding that constitutes the stator.

FIG. 3 is a development view for explaining the relationship between the waveform winding and the slot.

4A and 4B are explanatory views of an arrangement state of enamel wires forming the corrugated winding, FIG. 4A is a cross-sectional view taken along the line IVA-IVA in FIG. 2, and FIG. 4B is a cross-section taken along the line IVB-IVB in FIG. It is a figure.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Motor 12 ... Three-phase stator 14 ... Rotor 16 ... Stator core 18a-18c ... Waveform winding 22 ... Slot 23 ... Enameled wire 24, 24a-2
4i ... Coil end 26a, 26b ... Straight part 28 ... Curved part 30a, 30b ... Twist-shaped part 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 (1)

[Claims] 1. A stator in which a corrugated winding formed of a continuous coil in which a plurality of strands are bundled is arranged in a slot of a stator core, and the coil end of the corrugated winding led out between the slots is A pair of linear portions extending from the end faces of the respective stator cores, and a curved portion integrally provided on the pair of linear portions, wherein the pair of linear portions each have a twist-shaped portion for dislocation. A stator characterized by being mutually inverted.