JPH11178264A - Armature windings for low voltage electric machines - Google Patents

Abstract

(57) Abstract: Provided is an armature winding for a low-voltage electric machine in which a self-fusing magnet wire and a lead wire connection portion at an end portion have improved vibration resistance. An armature (stator) 1 of a low-voltage electric machine (induction motor) has an end covering member 4 covering an end portion 88 and having a self-fusing adhesive layer, compared to a conventional example, and has a coil. The armature winding 2 has a sheet-shaped insulator 71 interposed between the coil ends 81. The end cover 4 fixes the lead wire 82 to the end 88 near the end on the connection side. The self-fusing adhesive layer of the self-fusing magnet wire 89 for the coil 81, the slot insulator, etc., the end covering 4, and the insulator 71 based on aromatic polyamide paper are provided on both sides of the base material. For the self-fusing adhesive layer, a semi-cured heat-resistant epoxy resin material is used. The stator 1 is subjected to a heat treatment of the self-fusing adhesive layer at about 150 ° C. Note that a heat-shrinkable electrical insulating material can be used for the end covering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an armature winding for a low-voltage electric machine using a self-fusing magnet wire, and more particularly to a self-fusing magnet wire and a lead at an end of the armature winding. The present invention relates to a structure having improved vibration resistance for a wire connection.

[0002]

2. Description of the Related Art In a low-voltage electric machine such as an induction motor or an induction generator connected to a low-voltage distribution system having a voltage of 440 [V] or less, an armature (a stator or a rotor of a winding-type induction motor) is used. For example, a well-known magnet wire is generally used for the winding. A low-voltage electric machine in which a self-fusing magnet wire is used as the magnet wire is known from Japanese Patent Application Laid-Open No. 53-88901 and Japanese Patent Application Laid-Open No. 5-68359 filed by the same applicant. .

[0003] The low-voltage electric machine using the self-fusing magnet wire eliminates the need for the varnish impregnating process such as the varnish impregnating process for the armature winding, and the varnish impregnating equipment and varnish material accompanying the varnish process. Equipment such as environmental protection equipment to cope with the use of varnish, and post-treatment of armature after varnish treatment (such as removal of varnish material adhering to places where varnish treatment is unnecessary (such as the inner and outer surfaces of the stator core)) It has a great feature that can make it unnecessary.

A conventional example of an armature winding for a low-voltage electric machine, which is represented by an induction motor, will be described with reference to FIG.
This will be described with reference to FIG. Here, FIG. 9 is a longitudinal sectional view schematically showing a main part of a stator of an induction motor having an armature winding for a conventional low-voltage electric machine, and FIG.
It is an enlarged view of the P section in FIG.

[0005] In FIGS. 9 and 10, reference numeral 9 denotes a cylindrical shape having a plurality of slots 92 formed by stacking a large number of armature windings 8 and an iron core plate made of silicon steel at equal pitches. Stator core 91, slot insulator 93 and slot wedge 9
4 of the induction motor. The slot insulator 93 may be made of an electric insulating material shown as a self-fusing thin leaf material in Japanese Patent Application Laid-Open No. 5-68359, or a Japanese Patent Application Laid-Open No. 53-889.
No. 01, such as an electrical insulating material shown as a double-sided fusible insulating film or sheet in a prepreg state,
Sheet-shaped electrical insulation material with a self-fusing adhesive layer
(Referred to as a sheet-like self-fusing electric insulating material). The slot wedge 94 is described in Japanese Patent Laid-Open No. 5-683.
As shown in JP-A-59-59, a sheet-like self-fusing electric insulating material is used when the slot 92 is a semi-closed slot, and a flat plate-like shape when the slot 92 is an open slot. Generally, an FRP material is used.

The armature winding 8 is a sheet-like insulator (generally referred to as inter-coil insulation or inter-phase insulation) interposed between the plurality of coils 81, the lead wires 82, and the coil ends of the coil 81. 83 and a plurality of coils 81
It has a well-known configuration of layered winding. Each coil 81 is manufactured by winding a self-fusing magnet wire 89 a plurality of turns. The self-fusing magnet wire 89 is a magnet wire having a self-fusing adhesive layer at the outermost periphery of the electric insulating film layer.
This is shown as a self-fusing magnet wire in JP-A-5-68359, and as a self-fusing insulated conductor in JP-A-53-88901. In addition,
In addition to the above, a general armature winding in which a plurality of coils 81 are formed as a single-layer chain winding or the like is known.

The self-fusing magnet wire 8
The same type of resin material is often used for the self-fusing adhesive layers of the slot 9, the slot insulator 93, and the slot wedge 94. For example, polyester-based, polyesterimide-based, polyamide-based, and epoxy-based adhesive layers are used. A semi-cured resin material or the like is used. As is well known, the coil 81 is loaded into a slot 92 of the stator core 91, and the following method is adopted as a general loading method. That is, the self-fusing magnet wire 89
A method of manually forming a well into a slot 92 provided with a slot insulator 93 after preforming as a well-known tortoise-shaped coil or the like using a self-fusing method. A method of directly winding and loading the magnet wire 89 by mechanical winding.

The armature winding 8 has ends 88, 88 formed by collecting the coil ends of a coil 81. As is well known, in the armature winding 8, the coil 81 is formed at the coil end, that is, the end, so that a coil group having a number corresponding to the number of phases and the number of poles that the induction motor having the stator 9 should have is formed. At a portion 88, they are electrically connected to each other. At this time, the self-fusing magnet wire 89
A known crossover (not shown) is also used as necessary for the terminal section. A polyethylene terephthalate (PET) film, aromatic polyamide paper, or the like is used as the sheet-like electric insulating material used for the insulator 83, and a well-known heat-resistant vinyl insulating lead wire is used as the lead wire 82. Have been.

The lead wire 82 is connected to the coil group either directly with the terminal of the self-fusing magnet wire 89 in the coil group or via the crossover wire, and the connecting portion has a well-known portion (not shown). Is electrically insulated by a connection insulator. This connection part insulator is made of tape material such as heat-resistant vinyl, PET, aromatic polyamide paper,
Sheet materials and tube materials are used. Further, a terminal portion of the lead wire 82 which is continuous with the connection portion is provided along the end portion 88. The opposite side of the lead wire 82 is connected to a well-known terminal box (not shown) of the induction motor including the stator 9.

The stator 9 loaded with the armature winding 8
The self-fusing adhesive layer of the self-fusing magnet wire 89, the slot insulator 93, and the slot wedge 94 are formed by a well-known appropriate heating method such as using a heating furnace.
The self-fusing adhesive layer has a heat treatment. Each of the above-mentioned self-fusing adhesive layers once becomes softened (often several seconds to several tens of seconds) or becomes a low-viscosity state by being subjected to a heat treatment due to known properties.

At this time, the self-fusing magnet wire 89
Between the self-fusing magnet wire 89 and the slot insulator 93 and the slot wedge 94, the slot insulator 9
3, a portion disposed between the slot wedge 94 and the stator core 91, between the self-fusing magnet wire 89 and the insulator 83, and along the end 88 of the lead wire 82 (the connecting portion insulator is ) And the self-fusing magnet wire 89 are fused together. Then the stator 9
At the end of the heat treatment, the hardening of the self-fusing adhesive layer is completed, so that the integrated armature winding 8 is formed.

[0012]

The above-described armature winding 8 for a low-voltage electric machine according to the prior art does not require an integrated process using a varnish material. Various equipment, post-treatment after varnish treatment, etc. can be made unnecessary, thereby solving the problem of adverse effects on the working environment and obtaining an integrated treatment in which the working process is simplified and time is saved. I can do it.
However, the bonding strength between the self-fusing magnet wires 89 in the armature winding 8 according to the prior art, and the bonding between the self-fusing magnet wires 89 and the lead wires 82 (including the connecting portion insulator). When the strength is compared with that of the armature winding that has been subjected to the integration treatment using the varnish material, the strength is not necessarily sufficient against mechanical vibration and impact.

When a mechanical vibration or impact is applied, the portion of the coil side loaded in the slot 92 of the coil 81 is held by the stator core 91 via the slot insulator 93 or the like. Although there is no problem, the self-fusing adhesive layer of the self-fusing magnet wire 89 may be damaged at the end 88 of the armature winding 8. Among them, the portion arranged along the end portion 88 of the lead wire 82 has a structure in which the lead wire 82 oscillates when subjected to mechanical vibration or impact. In this case, the self-fusing adhesive layer of the self-fusing magnet wire 89 is easily damaged. For this reason, the self-fusing adhesive layer of the self-fusing magnet wire 89 at the end 88 of the armature winding 8 according to the prior art is damaged when subjected to mechanical vibration and shock. However, there is a problem that the long-term reliability of the armature winding 8 is reduced, and a solution is desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a low-voltage electric machine having improved vibration resistance with respect to a self-fusing magnet wire and a lead wire connecting portion at an end. An object of the present invention is to provide an armature winding for a machine.

[0015]

According to the present invention, there are provided the following objects: 1) From a plurality of coils manufactured using a self-fusing magnet wire and loaded into a plurality of slots of an iron core made of a magnetic material. An armature winding for a low-voltage electric machine, wherein a lead wire is connected to a terminal of the self-fusing magnet wire in a coil group formed by electrically connecting these coils. The end of the armature winding formed by assembling the coil ends of the coil may be an end cover made of an electrically insulating material having a self-fusing adhesive layer, and / or a heat-shrinkable end cover. An end cover made of an electrically insulating material, and a heat treatment is applied to fix the lead wire to the end and integrate the end; or 2. ) Self-fusing magnet wire The self-fusing magnet in a coil group formed by a plurality of coils manufactured and loaded in a plurality of slots of an iron core made of a magnetic material, and formed by electrically connecting these coils. In an armature winding for a low-voltage electric machine in which a lead wire is connected to a terminal portion of the wire, the lead wire is
A connection portion with a self-fusing magnet wire and the like and a terminal portion on the connection portion side are covered with a lead portion covering made of an electrical insulating material having a self-fusing adhesive layer, and the coil is formed by performing a heat treatment. Or 3) using a self-fusing magnet wire to fix the lead wires to the ends of the armature windings formed by assembling the coil ends. The self-fusing magnet wire in a coil group formed by a plurality of coils that are manufactured and are loaded in a plurality of slots of an iron core made of a magnetic material, and are formed by electrically connecting these coils. In the armature winding for the low-voltage electric machine in which the lead wire is connected to the terminal of the lead wire,
A connection portion with the self-fusing magnet wire and a terminal portion on the connection portion side are covered with a lead portion covering made of an electrically insulating material having a self-fusing adhesive layer, and coil ends of the coil are assembled. The end of the armature winding thus formed has an end cover made of an electrically insulating material having a self-fusing adhesive layer, and / or
Alternatively, an end covering made of a heat-shrinkable electrical insulating material is provided, and a heat treatment is performed to fix the lead wire to the end and integrate the end. Or 4) In the means described in any one of the above items 1 to 3, the coil includes a sheet-like insulator interposed between coil ends thereof, and the insulator is self-fusing. (5) The heat treatment is performed so that the end portions of the armature windings are integrated with each other by heat treatment. In the means according to any one of Items 3 and 4, the end covering is formed in advance in a shape substantially conforming to the outer shape of the end of the armature winding and then arranged on the end of the armature winding. It is achieved by having a configuration provided.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An armature winding for a low-voltage electric machine according to various embodiments of the present invention will be described in detail with reference to the drawings. In the following description, FIG.
The conventional armature winding for a low-voltage electric machine shown in FIG.
The same parts as those of the electric machine having the armature windings are denoted by the same reference numerals, and the description thereof will be omitted. Further, in the drawings used in the following description, as to the reference numerals given in FIGS. 9 and 10, only the representative reference numerals are described as much as possible.
The description of the embodiment of the present invention will be made first on behalf of an induction motor.

FIG. 1 is a partial cross-sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to an embodiment of the present invention at a position equivalent to the portion P in FIG. In FIG. 1, reference numeral 1 denotes a stator 9 of an induction motor according to the conventional example shown in FIGS. 9 and 10, which has an end cover 4 instead of an armature winding 8 and a coil 81 of a coil. This is a stator of an induction motor including an armature winding 2 using an insulator 71 as a sheet-shaped insulator interposed between ends. The end covering 4 is a characteristic structure of the armature winding according to the present invention, and is a sheet made of a self-fusing electric insulating material and / or a heat-shrinkable electric insulating material. ing.

The material that can be used as the self-fusing electric insulator for the end cover 4 is the self-fusing magnet wire 89, the slot insulator 93, and the slot wedge 94 in the conventional stator 9. The above-mentioned resin material group such as a semi-cured epoxy resin used for the self-fusing adhesive layer. The self-fusing electric insulator used for the end cover 4 may be, for example, a sheet formed from an appropriate resin material in the resin material group, or a sheet-shaped base material and It is a sheet-shaped electric insulator having a self-fusing adhesive layer formed on a side surface using an appropriate resin material of the resin material group. As the base material in the latter case, for example, a PET film, a polyphenylene sulfide (PPS) film used as a base material of the slot insulator 93,
A sheet material such as a polyimide resin film can be used.

The heat-shrinkable electrical insulating material that can be used for the end cover 4 has a tape, sheet, or tube shape of ethylene propylene, cross-linked polyethylene, silicone, or fluororesin. It is a heat-shrinkable electrical insulator. Further, the insulator 71 is a sheet-like insulating material having the same configuration as the insulator 83 according to the conventional example, a sheet-like insulating material having a self-fusing adhesive layer formed on a side surface of the insulating material, and a slot insulating material. Any of sheet-like insulating materials having the same configuration as the body can be appropriately selected. The resin material used for the self-fusing adhesive layer of the insulator 71 can be selected from the above-described resin material group for the self-fusing adhesive layer used for the end cover 4.

Self-fusing magnet wire 89, slot insulator, slot wedge, end cover 4 and insulator 71
The electric insulating material used for the self-fusing adhesive layer possessed by is advantageous because the heat treatment of the self-fusing adhesive layer can be performed simultaneously under the same processing conditions. Is used. Here, the case of the end cover 4 using the self-fusing electric insulator will be further described. The end cover 4 can be manufactured by cutting a sheet-shaped material according to the shape and size of the end 88 of the armature winding 2. In addition, through holes and cuts are formed in appropriate places of the end cover 4 to allow the lead wire 82 to penetrate as necessary.

Since the self-fusing adhesive layer used for the end cover 4 has a viscosity even at room temperature, the sheet-shaped end cover 4 can be inserted into the insulator 71 or the lead wire 82. The end portion 88 and the lead wire 82 of the portion disposed along the end portion 88 are manually attached to the assembly of the connected coils 81 so as to cover the end portion 88. Thus, after the operation of covering the end 88 with the end covering 4,
In the stator 1, the self-fusing adhesive layer of the end cover 4 and the like is subjected to heat treatment in the same manner as in the case of the stator 9 of the conventional example. In this heat treatment, the self-fusing adhesive layer and the self-fusing magnet wire 89 of the end cover 4 are provided.
The heat treatment is carried out simultaneously with the heat treatment of the self-fusing adhesive layer of the slot insulator and the self-fusing adhesive layer of the slot insulator and the slot wedge.

At this time, the self-fusing adhesive layer of the self-fusing magnet wire 89 on the outer periphery of the end 88 of the armature winding 2 is formed by the self-fusion of the end covering 4 covering the outer periphery. It will fuse with the adhesive layer. Further, a connection portion between the lead wire 82 and the self-fusing magnet wire 89 or the like or an end portion 88
The outer peripheral portion of the lead wire 82 at a portion disposed along the end portion is covered with the end covering member 4. At the end stage of the heat treatment of the stator 1, the armature winding 2 whose end 88 is strengthened by the end covering 4 to form an integrated state is formed.
The lead wire 82 of the portion arranged along the end cover 4
As a result, it is firmly fixed to the end portion 88. At that time, the insulator 7
When a material having a self-fusing adhesive layer is used as 1, the end 88 of the armature winding 2 has the self-fusing adhesive layer of the self-fusing magnet wire 89 and the insulator 71. When the self-fusing adhesive layer and the self-fusing adhesive layer fuse with each other, the integrated state is strengthened also in the inside thereof.

That is, since the armature winding 1 according to the embodiment of the present invention shown in FIG. 1 has the above-described configuration, the characteristics of the armature winding according to the prior art (varnish material for the armature winding). Low pressure with improved long-term reliability, while maintaining the same characteristics as the conventional example, while maintaining the feature of eliminating the need for integrated processing using A new feature that an induction motor can be obtained can be added.

In the above description, the end covering 4 using the self-fusing electric insulator is obtained by cutting a sheet-shaped material according to the shape and dimensions of the end 88 of the armature winding 2. It has been described that the end portion 88 and the lead wire 82 of the portion disposed along the end portion 88 are attached by hand manually. However, as a method for disposing the end covering body 4 using the self-fusing electric insulator on the end portion 88, various methods described below can be adopted.

First, the end covering 4 is attached to the armature winding 2.
Is cut into an elongated rectangle or a long object having a width dimension substantially matching the height dimension (indicated by H in FIG. 1) of the end portion 88, and this is cut into the side surface of the end portion 88 and the inner surface thereof. End covering body 4 to be attached and end covering body 4 to be attached to the outer surface thereof
And a method of manually sticking them separately. In this case, consideration for passing the lead wire 82 can be omitted, and the work of attaching the end covering 4 to the end 88 can be facilitated. In order to hold the connecting portion between the lead wire 82 and the self-fusing magnet wire 89 and the like and the outer peripheral portion of the lead wire 82 disposed along the end portion 88, these portions are , At least one end covering 4.

The end covering 4 is formed by previously forming a self-fusing electric insulator into an annular body having a U-shaped cross section which is substantially matched to the shape and dimensions of the end 88 of the armature winding 2. The self-fusing adhesive layer has the self-fusing adhesive layer at room temperature only by forming the end covering body 4 formed as a molded body and then covering the formed end covering body 4 after forming a through hole or the like as necessary for penetrating the lead wire 82. A method of attaching to the end portion 88 by using the viscosity can be adopted.
In this case, the penetrating portion for the lead wire 82 can be separately formed in advance, so that there is almost no part to be manually performed when attaching the end covering 4 to the end 88. Therefore, the operation process of disposing the end covering 4 at the end 88 can be simplified, and the operation time can be shortened.

The end cover 4 is formed by forming a self-fusing electric insulator into an annular body having an L-shaped cross section in accordance with the shape and dimensions of the end 88 of the armature winding 2. The inside and outside of the end 88 are prepared as separate members, and these members are separately covered on the inside and the outside of the end 88, respectively. A method of attaching to the end portion 88 by utilizing the viscosity that sometimes exists can be adopted. In this case, it is possible to eliminate the necessity of making the lead wire 82 penetrate, and it is possible to substantially eliminate a portion which is manually performed when attaching the end cover 4 to the end 88. The operation process for disposing the end cover 4 on the end 88 is simplified,
In addition, work time can be reduced.

The end covering 4 is formed by previously forming a self-fusing electric insulator as a long object having an L-shaped cross section which is substantially matched to the shape and dimensions of the end 88 of the armature winding 2. , Which are cut to substantially match the perimeters of the inner and outer portions of the end portion 88, and then are separately covered on the inner and outer portions of the end portion 88, respectively, so as to be self-fused. A method can be adopted in which the adhesive layer is attached to the end 88 using the viscosity of the adhesive layer at room temperature. In this case, lead line 8
2 can be made unnecessary, and when the end cover 4 is attached to the end 88, the cross-sectional shape is L-shaped, so that the end cover 4 with respect to the end 88 is formed. The positioning of the end cover 4 at the end 88 can be simplified considerably, and the operation time can be considerably shortened since the ratio of manual operation can be reduced by the ease of positioning. Can be.

The end covering 4 made of a self-fusing electric insulator is provided on the inner side of the end 88 of the armature winding 2 and has the above-mentioned member (L-shaped section). (Either an annular body or a long body can be adopted).
A configuration in which a tape-shaped self-fusing electric insulator is wound around the outer portion of the tape. The end covering 4 having this configuration is composed of a tape-shaped self-fusing electrical insulator having an end 88.
The advantage is that it can be easily wound by machine winding on the outside of the end portion 88, and an L-shaped member that can be easily attached by hand to the inside of the end portion 88 where the machine winding is difficult is used. By using this, the work of arranging the end covering body 4 on the end 88 is rationalized.

Incidentally, in the case of the end covering 4 using a heat-shrinkable electric insulating material, the form of the end covering 4 may be, for example, a sheet-like heat-shrinkable electric insulating material formed by an armature winding. The second end 88 is cut into an elongated rectangle or a long object having a width dimension substantially matching the H dimension, a tape-like heat-shrinkable electrical insulating material having a width dimension considerably smaller than the H dimension, an armature. A ring-shaped heat-shrinkable electrical insulating material having a diameter slightly larger than the outer dimension of the end 88 of the winding 2 can be used. This ring-shaped heat-shrinkable electrical insulating material can be obtained, for example, by cutting a tube-shaped or bag-shaped heat-shrinkable electrical insulating material into a length substantially matching the H dimension. In addition, as for the heat shrinkage treatment temperature of the end covering member 4, it is possible to select a material which is equal to or different from the heat treatment temperature of the self-fusing adhesive layer of the self-fusing magnet wire 89.

The method of attaching the end covering 4 to the outer side of the end 88 is as follows. When the end covering 4 is an elongated rectangle or the like, the width direction of the end covering 4 is set to the width of the end 88. The end covering 4 is wound around the outside of the end 88 in accordance with the H dimension direction. Further, in the case of the tape-shaped end covering 4, the same end covering 4 is applied to the end 88 having any H dimension.
Can be applied and can be wound around the outside of the end portion 88 by mechanical winding, so that the winding operation can be easily performed. In the case of the ring-shaped end covering 4, the end covering 4 is connected to the end 88.
Since the mounting operation is completed only by inserting it into the outside of the device, the mounting operation can be simplified.

Further, when the end cover 4 made of a heat-shrinkable electrical insulating material is used, the lead wire 82 may be formed at a portion disposed along the end 88 of the lead wire 82 or at a position where the lead wire 82 extends. The connection between the wire 82 and the self-fusing magnet wire 89 or the like is disposed at a portion that can be covered by the end covering 4, so that the fixing of these portions to the end 88 can be performed by the end covering. 4 is preferable because it can be performed. When the end covering 4 made of a heat-shrinkable electric insulating material having a heat-shrinking treatment temperature equivalent to the heat-treating temperature of the self-fusing adhesive layer is used, the end covering 4 is made of an armature. After being attached to the outside of the end 88 of the winding 2, the stator 1
The self-fusing adhesive layer of the self-fusing magnet wire 89, the slot insulator, the self-fusing adhesive layer of the slot wedge, and the insulator are formed in the same manner as in the case of the stator 9 of the conventional example. The heat treatment of the self-fusing adhesive layer of 71 is performed.

At the time of this heat treatment, as described above, the self-fusing adhesive layers adjacent to each other among the self-fusing adhesive layers of the self-fusing magnet wire 89 and the like are fused with each other. At this time, since the end coverings 4 simultaneously undergo thermal contraction, a force for tightening the entire end 88 from the outer surface to the inner side is exerted. Due to this tightening force, a pressing force is applied to a portion of the adjacent self-fusing adhesive layer which is located inside the end cover 4, and the pressing force acts on the self-fusing adhesive layer. In the mutual fusion state, the fusion range is expanded and the fusion state is promoted.

With these features, the adhesive strength between the self-fusing adhesive layers at the end portion 88 at the end stage of the heat treatment of the stator 1 can be remarkably increased. That is, the strength of the stator 1 against mechanical vibrations and shocks can be reduced by attaching the end covering 4 made of a heat-shrinkable electrical insulating material to the outside of the end 88 of the armature winding 2. Thus, a low-voltage induction motor with improved long-term reliability can be obtained.

When the end covering 4 made of a heat-shrinkable electric insulating material having a heat-shrinking treatment temperature lower than the heat treatment temperature of the self-fusing adhesive layer is used, the end covering 4 is After the heat treatment of the self-fusing adhesive layer is completed, it is attached to the outer portion of the end portion 88 of the armature winding 2 by the above-described method, and thereafter, the heat treatment of the end cover 4 is performed.
In this case as well, due to the heat shrinkage of the end covering member 4, a force for tightening the entire end portion 88 from the outside to the inside thereof acts. However, this tightening force is applied to the end portion of the stator 1. 88
Acts as a binding force to bind the end portions 88, thereby increasing the strength of the stator 1 against mechanical vibration and impact.

The end covering 4 may have a configuration in which a member made of a self-fusing electric insulator and a member made of a heat-shrinkable electric insulating material are combined. In order to form the end covering 4 having the composite structure, for example, a self-fusing electric insulator having an L-shaped cross section is provided inside the end 88 of the armature winding 2. The above member (an annular body and a long object can be adopted) is used, and the above member made of a heat-shrinkable electrical insulating material is used outside the end portion 88.
Then, by performing heat treatment on both members under the same temperature condition, the end covering 4 having a composite structure is obtained. The end covering 4 having this configuration has the above-mentioned features of the end covering 4 made of a self-fusing electric insulator and the above-mentioned features of the end covering 4 made of a heat-shrinkable electric insulating material. By being combined, the stator 1 can have a large strength against mechanical vibration and impact.

Further, the end covering 4 may have a configuration in which a covering made of a self-fusing electric insulator and a covering made of a heat-shrinkable electric insulating material are overlapped. To form the end covering 4 having the composite structure, for example, a covering made of a self-fusing electric insulator is provided so as to cover the entire surface of the end 88 of the armature winding 2 (the above-described covering). In addition, a coating made of a heat-shrinkable electrical insulating material is provided on the outer portion of the end portion 88 from above the coating made of a self-fusing electrical insulating material. Then, by performing a heat treatment on the two coatings under the same temperature condition, the end coating 4 having a composite structure is obtained. Compared with the case where the end covering 4 having this configuration is used with the above-mentioned end covering 4 made of a heat-shrinkable electric insulating material, the use amount of the self-fusing electric insulator is relatively increased. Therefore, the volume of the portion where the self-fusing adhesive layers are fused to each other is greatly increased, and the strength of the stator 1 against mechanical vibration and impact can be significantly increased.

Next, an armature winding for a low-voltage electric machine according to another embodiment of the present invention will be described with reference to FIG. In the following description, the same portions as those of the armature winding for a low-voltage electric machine according to the present invention shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Here, FIG. 2 is a partial cross-sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to a different example of the embodiment of the present invention at a portion equivalent to the portion P in FIG. In FIG. 2, reference numeral 1A denotes a stator 9 of the conventional induction motor shown in FIGS.
This is a stator of an induction motor in which an insulator 71 is used as a sheet-shaped insulator inserted between coil ends of a coil 81 and an armature winding 2 </ b> A having an outlet cover 72 is provided. .

The outlet cover 72 is a characteristic structure of the armature winding according to the present invention, and is made of a self-fusing electric insulator having a tape, sheet, or tube shape. ing. The material that can be used as the self-fusing electrical insulator for the outlet cover 72 is the aforementioned end cover 4.
Since it is the same as the material used as the self-fusing electrical insulator for use, the description thereof will be omitted to avoid duplication. The lead-out portion covering member 72 is provided between the lead-out wire 82 and the outside of the above-described connecting portion insulator (not shown) applied to the connection portion of the lead-out wire 82 with the self-fusing magnet wire 89 or the crossover. The outer side of the terminal portion is connected and covered.

When the outlet cover 72 is in the form of a tape or a sheet, it is wound around the connection insulator and the outer periphery of the lead wire 82 after the connection insulator is applied. When the outlet cover 72 is tubular,
For example, after being inserted so as to avoid the connection portion of the lead wire 82 before being connected to the self-fusing magnet wire 89 and the like, and provided with a connection portion insulator, the outer periphery of the connection portion insulator and the lead wire 82 are provided. And moved to cover. Also, in this case,
A tube-shaped outlet cover 72 which is cut open vertically may be placed on the outer periphery of the connection insulator and the outlet wire 82. Regardless of which coating method the outlet cover 72 employs, the outlet cover 72 must be such that the self-fusing adhesive layer used for the outlet cover 72 has viscosity at room temperature. Is attached to the outer periphery of the end 88 of the armature winding 2A.

Thus, after the operation of attaching the lead cover 72 to the outer peripheral portion of the end 88, the lead wire 8
After the connection portion 2 and the terminal portion on the connection portion side of the lead wire 82 are temporarily attached to the outer peripheral portion of the end portion 88 via the lead portion covering member 72, the stator 1A becomes the stator 9 of the conventional example. By the same method as in the above case, the heat treatment of the self-fusing adhesive layer of the outlet cover 72 and the like is performed. In this heat treatment, the self-fusing adhesive layer of the outlet cover 72, the self-fusing adhesive layer of the self-fusing magnet wire 89, and
This is performed simultaneously with the heat treatment of the self-fusing adhesive layer of the slot insulator and the slot wedge.

At this time, a part of the self-fusing adhesive layer of the self-fusing magnet wire 89 on the outer peripheral portion of the end 88 of the armature winding 2A is partially It will fuse with the fusible adhesive layer. At the end stage of the heat treatment of the stator 1 </ b> A, the terminal part on the connection part side of the lead wire 82 and the connection part of the lead wire 82 are firmly fixed to the end part 88 by the lead cover 72. At this time, when the insulator 71 having a self-fusing adhesive layer is used, the armature winding 2
The end portion 88 of the self-fusing magnet wire 89 and the self-fusing adhesive layer of the insulator 71 are fused with each other, so that the integration inside is strengthened. become.

That is, since the armature winding 1A according to a different example of the embodiment of the present invention shown in FIG. 2 has the above-described structure, at least the strength against mechanical vibration and impact at least in the vicinity of the connection of the lead wire 82 is provided. Can be increased as compared with the conventional example. That is, by using the armature winding 1A, the long-term reliability of the low-voltage electric machine used under the condition that the applied mechanical vibration and impact are not so large can be improved.

Next, an armature winding for a low-voltage electric machine according to still another embodiment of the present invention will be described with reference to FIG. In the following description, the same portions as those of the armature winding for a low-voltage electric machine according to the present invention shown in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. Here, FIG.
FIG. 10 is a partial cross-sectional view showing a stator of an induction motor including an armature winding for a low-voltage electric machine according to still another example of the embodiment of the present invention in a portion equivalent to a portion P in FIG. 9. In FIG. 3, 1B is provided with an armature winding 2B having a lead-out cover 72 instead of the armature winding 2 with respect to the stator 1 of the induction motor according to the present invention shown in FIG. And a stator of the induction motor.

The armature winding 2B has a lead wire 82 and a self-fusing magnet wire 8 when compared with the armature winding 2 described above.
A lead cover 72 is provided so as to connect the outside of a not-shown connection insulator provided to the connection part with the lead 9 and the outside of the terminal part of the lead wire 82 on the connection part side. Only that they are different. The operation and effect obtained by disposing the outlet cover 72 are the same as those in the case of the armature winding 2A, so that the description is omitted to avoid duplication. In the armature winding 2B having this configuration, in addition to the action and effect of the armature winding 2, mechanical vibration and
The strength against impact can be further increased, and the stator 1B can have further improved long-term reliability.

In the above description, the armature winding according to the present invention has been applied to the stator winding of an induction motor which is a rotating electric machine. However, the present invention is not limited to this. For stator windings of induction generators, armature windings of wound-type induction machines, armature windings of synchronous motors that are rotating electric machines, and armature windings of linear induction machines and synchronous machines. Even if applied, the same operation and effect as the above-described operation and effect obtained in the stator winding of the induction motor can be obtained.

[0047]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, a stator of an induction motor provided with an armature winding for a low-voltage electric machine according to an embodiment of the present invention shown in FIG. 1 and an embodiment of the present invention shown in FIG. Stator of induction motor having armature winding for low-voltage electric machine according to different examples, and FIGS. 9 and 10
The same parts as those of the stator of the induction motor having the armature winding for the low-voltage electric machine shown in FIG. In addition, in the drawings used in the following description, only reference numerals shown in FIGS. 1, 2, 9 and 10 are represented as much as possible.

Embodiment 1 FIG. 4 shows an induction machine having an armature winding for a low-voltage electric machine according to an embodiment of the present invention corresponding to claims 1, 4 and 5 in a portion equivalent to the portion P in FIG. It is a fragmentary sectional view showing the stator of the electric motor. However, FIG.
In the figure, the lead wire is omitted, the cross-section of the armature winding is simplified and shown as a state before the heat treatment. In FIG. 4, reference numeral 1C designates a configuration in which the stator 1 of the induction motor according to the present invention shown in FIG. 1 includes an armature winding 3 having an end cover 5 instead of the armature winding 2. This is the stator of the induction motor.

The end covering 5 is made of a sheet-like, semi-cured heat-resistant epoxy resin material as a self-fusing electric insulating material, and is formed into the shape and dimensions of the end 88 of the armature winding 3. It is formed in advance into an annular body having a U-shaped cross section which is substantially matched to the above. The end covering 5 on the side of the lead wire 82 is formed with a through hole through which the lead wire 82 penetrates. Armature winding 3
For the self-fusing magnet wire 89, the slot insulator, and the slot wedge used in the above, a heat-resistant epoxy resin material semi-cured on the self-fusing adhesive layer is used. As the insulator 71, a sheet-like aromatic polyamide paper having a semi-cured self-fusing adhesive layer made of a heat-resistant epoxy resin material formed on both surfaces is used.

Since the stator 1C can be almost completely free of a portion to be manually attached to the end cover 88 when attaching the end cover 5 to the end 88, a work process for disposing the end cover 5 on the end 88 is not required. It has features that can be simplified and work time can be reduced. The stator 1 </ b> C is a state in which the end covering 5 is placed on the end 88 of the armature winding 3 (the state shown in FIG. 4).
The heat treatment of the self-fusing adhesive layer is performed using a heating furnace for about 1 hour.
It is performed under a temperature condition of 50 [° C.]. Since the vibration resistance obtained by the stator 1C manufactured in this manner has already been described, the description thereof will be omitted.

Embodiment 2 FIG. 5 shows an induction machine provided with an armature winding for a low-voltage electric machine according to a different embodiment of the present invention corresponding to claims 1, 4 and 5 in a portion equivalent to the portion P in FIG. It is a fragmentary sectional view showing the stator of the electric motor. However, in FIG. 5, the lead wire is omitted, the cross-sectional portion of the armature winding is simplified and shown as a state before the heat treatment. In FIG. 5, 1D includes an armature winding 3A having end coatings 5A and 5B instead of the armature winding 2 with respect to the stator 1 of the induction motor according to the present invention shown in FIG. And a stator of the induction motor.

The end coverings 5A and 5B are made of the same self-fusing electric insulating material as the end covering 5 in the first embodiment, and have almost the same shape and dimensions as the end 88 of the armature winding 3A. While being formed as a combined annular body having an L-shaped cross section, the inside is used as an end covering 5A, and the outside is used as an end covering 5B,
They were prepared as separate members. By merely covering the end coverings 5A and 5B separately on the inside and outside of the end 88, the self-fusing adhesive layer is attached to the end 88 by using the viscosity of the self-fusing adhesive layer at room temperature.

In the case of the end coverings 5A and 5B, it is not necessary to take care to penetrate the lead wire 82, and moreover, when attaching the end covering 4 to the end 88, it is necessary to perform manual operation. Since almost no part is required for the work, the work process of arranging the end cover 4 on the end 88 can be simplified, and the work time can be shortened. In addition,
In this case, the vicinity of the connection portion of the lead wire 82 is held by the end cover 5A. In the stator 1D, the heat treatment of the self-fusing adhesive layer is performed in a state where the end coverings 5A and 5B are put on the end 88 of the armature winding 3A (the state shown in FIG. 5). And at a temperature of about 150 ° C. Since the vibration resistance obtained by the stator 1D manufactured in this manner has already been described, the description thereof will be omitted.

Embodiment 3 FIG. 6 is provided with an armature winding for a low-voltage electric machine according to still another embodiment of the present invention corresponding to claims 1, 4, and 5 at a portion equivalent to the portion P in FIG. It is a fragmentary sectional view showing the stator of the induction motor.
However, in FIG. 6, the lead wires are omitted, the cross-section of the armature winding is shown in a simplified manner, and the state before the heat treatment is shown. 6, reference numeral 1E denotes an end covering 5 for the stator 1D of the induction motor according to the present invention shown in FIG.
6B is a stator of an induction motor including an armature winding 3B having an end covering 5C using a tape-shaped self-fusing electric insulating material instead of B.

The end cover 5A is the same member as the end cover 5A in the second embodiment, and is attached to the end 88 in exactly the same manner as in the second embodiment. The end covering 5C is made of the same self-fusing electrical insulating material as that used for the end coverings 5A and 5B in the second embodiment. Then, the end covering 5C is formed by mechanically winding the tape material around the outside of the end 88. That is, since the armature winding 3B can be easily wound mechanically on the outer side of the end portion 88, a tape-shaped self-fusing electric insulating material is used, and the end portion where it is difficult to adopt the mechanical winding is used. 8
By using an L-shaped member, which can be easily attached even by hand, to the inner portion of the inner portion 8, the work of arranging the end covering member 4 on the end portion 88 is rationalized.

The stator 1E includes end cover members 5A and 5C.
Is disposed at the end 88 of the armature winding 3B (the state shown in FIG. 6), the self-fusing adhesive layer is heated at a temperature of about 150 ° C. using a heating furnace. Done. Since the vibration resistance obtained by the stator 1E manufactured in this manner has already been described, the description thereof will be omitted. Embodiment 4 FIG. 7 shows a stator of an induction motor having an armature winding for a low-voltage electric machine according to an embodiment of the present invention corresponding to claims 3 and 4 in a portion equivalent to the portion P in FIG. FIG. However, FIG. 7 shows a simplified cross section of the armature winding. In FIG. 7, 1F is
The stator of the induction motor according to the present invention shown in FIG. 1 includes an armature winding 4 having an end covering 6 instead of the armature winding 2 in the stator of the induction motor according to the present invention. is there. As a material for the end cover 6, a tape-shaped cross-linked polyethylene resin material having a width dimension considerably smaller than the height dimension (H dimension) of the end section 88 is used as a heat-shrinkable electrical insulating material.

The self-fusing magnet wire 89 used for the armature winding 4, a slot insulator, a slot wedge,
In the self-fusing adhesive layer of the insulator 71, the first embodiment is used.
The same semi-cured heat-resistant epoxy resin material as that of the armature winding 2 is used. End coating 6
Is formed by mechanically winding the tape material around the outer surface of the end 88. The vicinity of the connection portion of the lead wire 82 is fixed by the tape material when the end cover 6 is formed. In the stator 1F, the heat treatment of the self-fusing adhesive layer and the heat-shrinkable electrical insulating material is performed by using a heating furnace in a state where the end coating 6 is formed on the end 88 of the armature winding 4. It is performed simultaneously at a temperature of about 150 ° C. Since the vibration resistance obtained by the stator 1F manufactured in this manner has already been described, the description thereof will be omitted.

Fifth Embodiment FIG. 8 shows an induction motor having an armature winding for a low-voltage electric machine according to a different embodiment of the present invention corresponding to claims 3 and 4 in a portion equivalent to the portion P in FIG. It is a fragmentary sectional view showing a stator. However, FIG.
Here, the cross section of the armature winding is shown in a simplified manner. In FIG. 8, 1G is different from the stator 1B of the induction motor according to the present invention shown in FIG. 3 in that an armature winding 4A having an end covering 6 is provided instead of the armature winding 2B. This is the stator of the induction motor.

The end covering 6 is made of the same material as that of the end covering 6 in the fourth embodiment and is formed by the same method. In the stator 1G, the heat treatment of the self-fusing adhesive layer and the heat-shrinkable electrical insulating material is performed by using a heating furnace in a state where the end covering 6 is formed on the end 88 of the armature winding 4A. It is performed simultaneously at a temperature of about 150 ° C. Since the vibration resistance obtained by the stator 1G thus manufactured has already been described, the description thereof will be omitted.

[0060]

The armature winding for a low-voltage electric machine according to the present invention has the following effects by adopting the structure described in the section of the means for solving the above-mentioned problems. By adopting the configuration according to the first aspect of the present invention, an armature winding integrated with an end cover is formed at an end of the armature winding. The lead wire provided at the end is firmly fixed to the end of the armature winding by the end covering. Thus, the strength of the end portion of the armature winding and the lead wire fixing portion against mechanical vibration and impact is increased, and the long-term reliability of the low-voltage electric machine can be improved. Further, the lead wire provided at the end of the armature winding is formed by the armature winding by the armature winding by employing the configuration according to the second aspect of the present invention. It is firmly fixed to the end of the winding. As a result, the strength of the lead wire fixing portion against mechanical vibration and impact is increased, and the long-term reliability of the low-voltage electric machine can be improved. In addition, by adopting the configuration according to item (3) of the means for solving the above problems, in addition to the effect of the above item, the strength of the lead wire fixing portion against mechanical vibration and impact is further increased. As a result, the long-term reliability of the low-voltage electric machine can be further improved. In addition, by adopting the configuration according to the item (4) of the means for solving the above-mentioned problem, in addition to the respective effects according to the items [1] to [6], the integration inside the end of the armature winding can be achieved. By being strengthened, the strength of the end of the armature winding against mechanical vibration and impact is increased, and the long-term reliability of the low-voltage electric machine can be further improved. Still further, by adopting the configuration according to the mode (5) of the means for solving the above-mentioned problems, the operation process relating to the formation of the end cover can be simplified, and the operation time can be reduced. Accordingly, it is possible to reduce the manufacturing cost of the low-voltage electric machine while maintaining the respective effects of the above items.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to an embodiment of the present invention in a portion equivalent to a portion P in FIG.

FIG. 2 is a partial cross-sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to a different example of the embodiment of the present invention in a portion equivalent to a portion P in FIG.

FIG. 3 is a partial cross-sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to still another example of the embodiment of the present invention in a portion equivalent to a portion P in FIG.

FIG. 4 is a view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to an embodiment of the present invention corresponding to claims 1, 4, and 5 in a portion equivalent to a portion P in FIG. Sectional view

FIG. 5 is a view showing a stator of an induction motor provided with an armature winding for a low-voltage electric machine according to a different embodiment of the present invention corresponding to claims 1, 4 and 5 in a portion equivalent to a portion P in FIG. Sectional view

FIG. 6 shows a stator of an induction motor provided with an armature winding for a low-voltage electric machine according to still another embodiment of the present invention corresponding to claims 1, 4, and 5 in a portion equivalent to the portion P in FIG. Partial sectional view

FIG. 7 is a partial sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to an embodiment of the present invention corresponding to claims 3 and 4 in a portion equivalent to a portion P in FIG.

FIG. 8 is a partial sectional view showing a stator of an induction motor having an armature winding for a low-voltage electric machine according to a different embodiment of the present invention corresponding to claims 3 and 4 in a portion equivalent to a portion P in FIG.

FIG. 9 is a longitudinal sectional view schematically showing a main part of a stator of an induction motor having an armature winding for a conventional low-voltage electric machine.

FIG. 10 is an enlarged view of a portion P in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Armature (stator) 2 Armature winding 4 End covering 71 Insulator 81 Coil 82 Lead wire 88 End 89 Self-fusing magnet wire

Claims (5)

[Claims] 1. A plurality of coils which are manufactured using a self-fusing magnet wire and are loaded in a plurality of slots of an iron core made of a magnetic material, and these coils are electrically connected. In the armature winding for a low-voltage electric machine in which a lead wire is connected to a terminal portion of the self-fusing magnet wire in the coil group formed by the above, formed by collecting the coil ends of the coil. The ends of the armature windings provided are provided with an end covering made of an electrically insulating material having a self-fusing adhesive layer and / or an end covering made of a heat-shrinkable electric insulating material. Wherein an armature winding for a low-voltage electric machine is subjected to a fixing process of the lead wire to the end portion and an integration process of the end portion. 2. A plurality of coils which are manufactured using a self-fusing magnet wire and are loaded in a plurality of slots of an iron core made of a magnetic material, and these coils are electrically connected. In the armature winding for a low-voltage electric machine in which a lead wire is connected to a terminal portion of the self-fusing magnet wire in the coil group formed by the lead wire, the lead wire has a self-fusing adhesive layer. A connection portion with a self-fusing magnet wire and the like and a terminal portion on the connection portion side are covered with a lead portion covering made of an electrically insulating material, and the coil ends of the coil are assembled by performing a heat treatment. An armature winding for a low-voltage electric machine, wherein the armature winding is fixed to an end of the armature winding formed as described above. 3. A plurality of coils manufactured using a self-fusing magnet wire and loaded in a plurality of slots of an iron core made of a magnetic material, and these coils are electrically connected. In the armature winding for a low-voltage electric machine in which a lead wire is connected to a terminal portion of the self-fusing magnet wire in the coil group formed by the lead wire, the lead wire has a self-fusing adhesive layer. An armature formed by covering a connection portion with a self-fusing magnet wire and a terminal portion on the connection portion side with a lead portion covering made of an electrically insulating material, and forming a coil end of the coil. The end of the winding is provided with an end covering made of an electrically insulating material having a self-fusing adhesive layer and / or an end covering made of a heat-shrinkable electric insulating material, and subjected to a heat treatment. Fixing the lead wire to the end and before An armature winding for a low-voltage electric machine, wherein an unification process of the end portions is performed. 4. The armature winding for a low-voltage electric machine according to claim 1, wherein the coil has a sheet-shaped insulator inserted between coil ends thereof. This insulator is made of an electrical insulating material having a self-fusing adhesive layer, and is subjected to a heat treatment to integrate the ends of the armature windings. Armature winding. 5. The armature winding for a low-voltage electric machine according to claim 1, wherein the end covering has a shape substantially matching the outer shape of the end of the armature winding. An armature winding for a low-voltage electric machine, which is formed in advance and disposed at an end of the armature winding.