JP2001061249A - Structure of interphase paper used for rotating system electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of drip-feed impregnation by especially changing the shape of an interphase paper and impregnating a wiring of intermediate layer with varnish, in a rotation system electric apparatus, such as a motor and a generator. SOLUTION: Three-phase stator windings 20U, 20V, 20W are formed on a stator 12. For example, interphase papers 26a, 26b are arranged between the stator winging 20W of the outermost layer and the stator winding 20V of an intermediate layer. The corner parts of the inter phase papers 26a, 26b are subjected to beveling. By positioning the beveled parts at the connection part of the stator winding 20W, varnish is dropped directly on the V-phase winding 20V of the intermediate layer when the varnish is dripped, and the intermediate layer can be impregnated surely with the varnish.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric device such as a motor or a generator, and more particularly to a structure of a phase sheet interposed between winding phases.

[0002]

2. Description of the Related Art A rotary electric device such as an electric motor or a generator includes a rotor connected to a rotating shaft and a stator attached to the outer peripheral surface of the rotor with a small gap. . An armature winding, a permanent magnet, and the like are provided on the rotor and the stator, and the rotor is rotationally driven in accordance with the excitation current supplied to the stator or the excitation current supplied to the rotor, or the electromotive force is generated. Take it out.

In such rotary electric equipment, for example, a three-phase AC motor (hereinafter simply referred to as a three-phase motor) is
Three-phase alternating currents U, V and W having phases different by 120 ° are used and supplied to the stator windings. For this purpose, for example, three-phase windings are applied to the stator, and interphase paper is interposed between the respective phases to insulate the respective windings from each other.

FIG. 8 (a) is a view showing the shape of a conventional interleaving paper. The interleaving paper 1 shown in FIG. 8 (a) is made up of a winding 2 shown in FIG. Interposed between phases. That is,
In the case of a three-phase AC motor, a three-phase stator winding is wound around the stator 4, and interphase paper is interposed between the respective phases. In the example of FIG. 2B, for example, a winding 3 forming a V-phase is wound inside a winding 2 forming a U-phase, and a phase sheet 1
Insulated.

[0005]

The following problems occur in the structure of the interleaving paper used in the above-mentioned conventional rotary electric equipment. That is, a varnish is dropped on the stator windings 2, 3 and the like in which the interleaf paper 1 having the above-described structure is interposed, for insulation. This dropping process is performed, for example, as shown in FIG.
This is a process in which a varnish heated to 0 ° C. is dropped from above to infiltrate the windings and the interphase paper.

For this reason, as shown in FIG.
In the case of a rectangular shape as shown in (a), the varnish is sufficiently dripped and infiltrated on the winding 2, but the varnish is not dripped on the winding 3 due to the presence of the interphase paper 1, Varnish is not supplied.

The varnish is dripped from the inside of the winding to the innermost winding 5, so that the varnish can be sufficiently infiltrated. The present invention, in order to solve the above problems,
It is an object of the present invention to provide a structure of an interphase paper used for a rotary electric device, in which a varnish is infiltrated into a winding of an intermediate phase by changing a shape of the interphase paper to improve reliability of dripping impregnation.

[0008]

According to an aspect of the present invention, there is provided a rotary electric machine in which windings of a plurality of phases are concentrically wound, and windings of the respective phases are arranged out of phase. In the stator windings of the device, the corners of the interleaving paper interposed between the windings are chamfered, and the corners are used as the structure of the interleaving paper used for the rotating electrical device located at the connection part of each phase. This can be achieved by providing.

Here, the rotary electric equipment is, for example, an electric motor, a generator, a synchronous phase adjuster, etc., and these rotary electric equipment are provided with a stator winding. This stator winding is constituted by a two-phase (single-phase) or three-phase winding in order to generate a rotating magnetic field, and each winding is insulated by interleaving paper. The corners of the interphase paper are chamfered, and the corners are located at the connection portions of the respective phases.

[0010] With this configuration, when the varnish is dripped and impregnated, the varnish penetrates into the windings of the intermediate phase through the corners of the chamfered interleaving paper, thereby ensuring insulation between the windings. Can be.

[0011] According to another aspect of the present invention, there is provided a stator for a rotary electric machine in which windings of a plurality of phases are wound concentrically and windings of the respective phases are arranged out of phase. In the windings, notches are provided on the side surfaces of the interleaving paper interposed between the windings at regular intervals, and the notches are used for rotating electrical equipment used in a rotary electric device located at a connection portion of the windings. This can be achieved by providing a paper structure.

In another aspect of the present invention, the subject rotary electric equipment is the same as described above, and may be a stator winding in which a plurality of phase windings are concentrically wound. The same is true. In this embodiment, the shape of the interleaf paper interposed between the windings is formed in a shape in which notches are provided at intervals corresponding to the positions of the connection portions of the windings, and this portion is located at the connection portion of the windings. .

With this configuration, when the varnish is dropped and impregnated, the varnish permeates the windings of the intermediate phase through the notched portions of the interphase paper, and insulation between the windings is ensured. Shall be.

According to a third aspect of the present invention, in the first or second aspect of the invention, the rotary electric device is, for example, a three-phase AC motor. In this example, an example of a three-phase AC motor is described as an example of a rotating electrical device. In the case of a three-phase AC motor, three-phase windings are wound around the stator with their phases shifted, and the windings of the middle layer in the concentric windings can be seen from between the upper windings. The chamfering position of the interleaf paper and the cutout position of the end face are set at the positions between the windings.

With this configuration, for example, when the varnish is dropped from above and infiltrated, the varnish is also dropped on the winding of the intermediate phase through the chamfered portion or the cutout position, and the varnish is formed on the winding of the intermediate phase. Insulation can be reliably performed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment,
1 illustrates an example of a three-phase AC motor as a rotating electrical device. <First Embodiment> FIG. 1 is a sectional view of a three-phase AC motor used in the description of the present embodiment. In FIG. 1, a three-phase AC motor 10 includes a rotor (rotor) 11 and a stator (stator) 12. The outer periphery of the stator 11 is covered with a frame 13, and the left and right sides of the stator 12 are surrounded by end brackets 14 and 15. Have been. The rotor 11 is fixed to a rotation shaft 16, and the rotation force of the rotor 11 is output to the outside via the rotation shaft 16.

One end of the rotating shaft 16 is attached to the end bracket 14 via a bearing 17 so that the rotating shaft 1
6 is connected to the end bracket 15 via the bearing 18.
Attached to.

The stator 12 is formed by laminating a plurality of stator plates made of, for example, a silicon steel plate and has a predetermined length. The stator 12 is configured by winding a stator winding 20 around a slot described later, and a part of the stator winding 20 protrudes from a side portion of the stator 12.

On the other hand, the outer peripheral surface of the stator 12 is
3, the frame 13 into which the stator 12 is press-fitted.
Are end brackets 14, 1 by bolts (not shown) or the like.
5 is attached.

FIG. 2 is a perspective view showing an external configuration of the stator 12 in the electric motor 10 having the above-described cross-sectional configuration. As shown in the figure, a stator winding 20 is wound around a stator 12, for example, a three-phase (U, V, W) winding connected in a delta (△) connection. Also, three-phase windings (U, V, W)
Are connected to lead wires 21 to 23 and lead wires 21 to 2
An armature current is supplied via 3.

Further, as shown in FIG.
V, W) are wound concentrically when viewed from the direction of the arrow a in the figure. For example, the innermost layer is a U-phase winding, and the intermediate layer is a V-phase winding. The outermost layer is a W-phase winding. Lead lines 21 to 23 correspond to (U,
V, W) phase windings. For example, the U-phase winding terminal wound on the innermost side is lead wire 2
1, the V-phase winding terminal wound on the intermediate layer is connected to the lead wire 22, and the W-phase winding terminal wound on the outermost layer is connected to the lead wire 23.

Further, between the layers of each winding (U, V, W),
Interphase paper is interposed. FIG. 3 is a diagram showing this configuration in detail, for example, an enlarged view of a circle B shown in FIG. As shown in the figure, phase sheets 25 and 26 are interposed between the layers. For example, the phase sheet 25 is interposed between the W-phase winding 20W and the V-phase winding 20V. Is interposed between the V-phase winding 20V and the U-phase winding 20U.
In addition, a plurality of interphase papers 25 and 26 are used, each of which has a number corresponding to the number of poles of the three-phase AC motor 10 of the present embodiment. For example, in the case of the interleaf paper 25, 25a, 25
b,..., and in the case of the interleaf paper 26, 26a, 26
b,...

The interleaf papers 25 and 26 disposed at the above-mentioned positions
FIG. 4 shows the structure of the single unit. Interphase paper 25 (25a, 25
b,...) have chamfered corners 27 and 28 as shown in the figure, and have interphase paper 26 (26a, 26b,...).
Similarly, the corners 27 and 28 are chamfered.
When the interleaf papers 25 and 26 having such a shape are interposed between the layers of the winding, they are performed as shown in FIG. That is, FIG. 5 is a view in which the protrusion of the winding 20 is viewed from the direction of arrow c in FIG.
The interphase papers 26a and 26b are indicated by dotted lines. As shown in the figure, the interphase paper 26a includes a W-phase winding 20W and a V-phase winding 20W.
V between the windings 20W on the interleaf paper 26a.
Shown as 0W-1. Further, the phase paper 26b is also a W-phase winding 20.
The winding 20W disposed between the W and V-phase windings 20V and on the interleaving paper 26b is indicated by 20W-2. Ainogami 26a and 2
The arrangement of 6b is performed by partially overlapping as shown in the figure, and the lower 20-phase winding 20V can be seen from the chamfered portions of the interleaf papers 26a and 26b.

A description will be given of a process in which varnish is dropped on a portion of the stator 12 where the windings and the interleaving paper are provided to infiltrate the windings. FIG. 6 shows three pipes 30-3.
FIG. 2 is a diagram illustrating a process of dropping varnish onto a winding and phase paper using No. 2; In the figure, pipes 30 and 31 are:
For example, a varnish heated to a temperature of 120 ° C. is sent from a tank (not shown), and is dropped from nozzles 33 and 34 of pipes 30 and 31. The varnish heated to a temperature of 120 ° C. is also sent from a tank (not shown) to the pipe 32, and is dropped from a nozzle 35 of the pipe 32.

The stator 12 on which the windings and the interleaving paper are disposed as described above is set on a jig (not shown), and when the stator 12 is set at a predetermined position, the nozzle 3
The W-phase winding 20W is located immediately below 3, 34, and the U-phase winding 20U is located immediately below the nozzle 35. For example,
The positions of the nozzles 33 and 34 located immediately above the W-phase winding 20W are shown by circles 33 'and 34' in FIG.

Therefore, in the above-described state, when varnish is dropped from the nozzles 33 and 34, the position 3 shown in FIG.
The varnish falls on 3 ′ and 34 ′, and the high-temperature (120 ° C.) varnish infiltrates into the W-phase winding 20W. Further, the varnish dropped from the nozzles 33 and 34 is directly dropped on the V-phase winding 20V through the chamfered portions of the interphase papers 26a and 26b, and also infiltrates the V-phase winding 20V. on the other hand,
The same applies to the nozzle 35. The varnish dropped from the nozzle 35 is dropped on the U-phase winding 20U, and is also dropped directly on the U-phase winding 20U via the chamfered portions of the interphase papers 25a and 25b. The varnish also infiltrates the phase windings 20U.

As described above, according to this embodiment, the interleaf paper 25,
The varnish is chamfered at the corner of 26, and the chamfered portion is located at the connection portion of the concentrically wound winding.
V) can be directly dropped on the winding, and the winding of the intermediate phase can be impregnated with a sufficient varnish.

In the above description of the embodiment, the three-phase AC motor 10 has been described. However, the present invention may be applied to other electric motors, or to other types of rotating electric equipment such as a generator. Can also. <Second Embodiment> Next, a second embodiment of the present invention will be described.

Also in this embodiment, the three-phase AC motor 10 shown in FIG. 1 is used, and the same members are denoted by the same reference numerals. Therefore, the three-phase AC motor 10 includes a rotor (rotor) 11 and a stator (stator) 12. The outer periphery of the stator 11 is covered by the frame 13, and the left and right sides of the stator 12 are surrounded by end brackets 14 and 15. I have.

FIG. 2 shows the appearance of the assembled stator 12. The stator 12 has a stator winding 20 wound thereon and a three-phase (U, V, W) winding wound thereon. ing. The three-phase windings (U, V, W) are connected to lead wires 21 to 23, and armature current is supplied via the lead wires 21 to 23.

Further, between the layers of each winding (U, V, W),
Interphase paper is interposed. FIG. 7 is a diagram showing the structure of the interphase paper used in this example. Interphase paper 3 used in this embodiment
6 is different from the case shown in FIG.
Not only the chamfers on 7, 38 but also cutouts on one side
9 and 40 are provided. The notches 39 and 40 are also installed so as to be located at the connection portion of the W-phase winding 20W.

Therefore, in the case of this example, the W-phase winding 20W is located as shown by the dotted line in FIG.
The arrangement is directly visible through 9, 40. For this reason, when the varnish is dripped on the winding and the interphase paper by using the apparatus shown in FIG. 6 described above, the varnish from the nozzles 33 and 34 is directly dripped onto the W-phase winding 20W and the V directly through the chamfers 37, 38 and the notches 39, 40
The varnish is dripped on the phase winding 20V, and the varnish infiltrates the V-phase winding 20V.

The same applies to the nozzle 35.
The varnish from the nozzle 35 is dropped on the U-phase winding 20U, and is also dropped directly on the V-phase winding 20V via the chamfers 37 and 38 and the notches 39 and 40 of the interphase paper 36, and from this direction. The varnish also infiltrates the V-phase winding 20V.

Therefore, according to the present embodiment, the varnish is directly dropped on the winding of the intermediate layer (the V-phase winding 20V) not only through the chamfers 37 and 38 but also through the notches 39 and 40. Can be impregnated with a sufficient varnish.

Although the interleaf paper 36 shown in FIG. 7 described in this embodiment has a configuration in which the corners are chamfered, it is not always necessary to perform the chamfering. However, in that case, the end of the interleaf paper 36 is arranged at a position other than the connection portion of the W-phase winding 20W.

In the description of the present embodiment, the three-phase AC motor 10 has been described. However, the present invention may be applied to other electric motors, or to a rotary electric device having another configuration such as a generator. Can also.

[0037]

As described above, according to the present invention,
By changing the shape of the interphase paper, the varnish can be surely dropped and impregnated, and the reliability of insulation increases.

In the present invention, by changing the shape of the interphase paper, dripping impregnation can be reliably performed, and a great effect of increasing the reliability of insulation can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a three-phase AC motor used in the description of the present embodiment.

FIG. 2 is a perspective view showing an external configuration of a stator.

FIG. 3 is a diagram illustrating a state of an interleaf sheet interposed between layers of each winding (U, V, W).

FIG. 4 is a diagram illustrating the shape of the interleaf paper of the present embodiment.

FIG. 5 is a diagram of the projection of the winding viewed from the direction of arrow c in FIG. 3;

FIG. 6 is a diagram illustrating a process of using three pipes and dropping a varnish on a winding and interphase paper.

FIG. 7 is a diagram illustrating the shape of the interleaf paper according to the second embodiment.

8A is a diagram showing the shape of a conventional interleaf paper, and FIG.
FIG. 3 is a diagram showing a state in which a winding forming a V phase is wound inside a winding forming a U phase.

FIG. 9 is a diagram showing a process in which a varnish is dropped from above to infiltrate windings and interphase paper.

[Explanation of symbols]

 Reference Signs List 10 three-phase AC motor 11 rotor (rotor) 12 stator (stator) 13 frame 14, 15 end bracket 16 rotation shaft 17, 18 bearing 20 stator winding 20U, 20V, 20W winding 21, 22, 23 lead wire 25, 25a, 25b Interphase paper 26, 26a, 26b Interphase paper 27, 28 Corner 30-32 Pipe 33-35 Nozzle 33 ', 34' Round 36 36 Interphase paper 37, 38 Corner 39, 40 Notch

Claims (3)

[Claims] 1. A stator winding of a rotary electric machine in which windings of a plurality of phases are wound concentrically and windings of the respective phases are arranged out of phase with each other. A corner portion of the interleaving paper is chamfered, and the corner portion is located at a connection portion of each phase. 2. A stator winding of a rotary electric device in which windings of a plurality of phases are wound concentrically and windings of the respective phases are arranged out of phase with each other. A notch is provided on a side surface of the interleaving paper at regular intervals, and the notch is located at a connection portion of the windings. 3. The structure of the interleaving paper used in the rotating electric device according to claim 1, wherein the rotating electric device is a three-phase AC motor.