JPH09322456A - Motor stator and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To definitely protect turn portions of a winding sticking out of a stator core and make the work simpler at a lower cost by hardening in a covered state the turn portions of a winding exposed at both the ends of a stator core and by providing an adhesive sheet adhered fully to the turn portions. SOLUTION: After winding an adhesive sheet 1 having no notch 2 around outer periphery of a turn portion 6 of a winding 5 exposed from both the ends of stator core 4, a portion having notch 2 is folded to the inner side, and the whole of the outer peripheral surface, end surface and inner peripheral surface of the turned portion is covered with an adhesive sheet 1. A lead wire is pulled out between the start and the end of the adhesive sheet 1. Since the adhesive sheet 1 is in a semi-hardened state, the turn portion 6 has a high conformability to irregularity without creating wrinkles or folded seams and can be tightly adhered by bending along the surface of the turn portion 6 almost on the whole surface, and the adhesive sheet 1 can be kept to a shape covering the turn portion 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator and a method of manufacturing the motor stator, and more particularly, to a winding portion protruding from a stator core, which is inexpensive, simple, and surely protected. The present invention relates to a motor stator in which the quality of parts can be easily checked and the turn part can be uniformly impregnated with a resin, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a stator of a motor has a winding process in which a slot insulating material is mounted in a groove of a stator core, a winding insulatingly coated with, for example, enamel is wound, and a wedge insulating material is fitted into an inlet of the groove. After that, perform a lacing process that bundles the turns of the windings protruding on both sides of the stator core with a thread, and further shape the bundled turns and shape them using a mold to a specified size. Then, in order to firmly maintain the shape of the winding, the turn part is impregnated with a thin varnish, and the varnish is heat-cured to bond the windings together. It is manufactured by the method of doing.

According to this conventional method for manufacturing a motor stator, the problem that the needle used in the lacing process hooks the winding to cut or damage it and lowers the yield, or the winding is caused by binding with a thread. There is a problem that a force is locally applied to the wire and the wire is easily broken.

In addition, since many of the laced turn parts are exposed, the other parts may hit the winding wire or rub the winding wire during handling in the subsequent steps such as the molding step. There is also a problem that damage or disconnection is likely to occur and the yield is further reduced.

Further, although the racing is carried out manually or automatically by a machine, it requires a considerable amount of skill in each case and there is a problem that it cannot be done easily.

In order to solve these problems, for example, as described in Japanese Patent Laid-Open No. 2-101940,
A method of covering the turn portion with an annular plastic cap having a U-shaped cross section has been proposed.

According to this method, a cap made of a synthetic resin having a thermoplastic property which has been molded in advance is covered on the turn portion, a molding die is further covered on this cap, and the cap is heated and pressed to form the cap into a predetermined final shape. are doing. If necessary, a cap formed into the final shape is adhered to the end surface of the stator core with an adhesive via an insulating sheet.

[0008]

However, this method requires a mold for forming the plastic cap in a predetermined shape in advance and a mold for covering the turn portion with the plastic cap and performing heat molding. In addition, it is necessary to prepare molds of various sizes corresponding to the size of the motor, which is disadvantageous in terms of cost reduction and there is a problem that lead wires are not easily drawn out. .

Further, since the plastic cap and the winding are not firmly adhered to each other, there is a problem that the winding vibrates in the plastic cap with the operation of the motor after the completion of the motor, and breakage due to fatigue easily occurs. .

In view of the above-mentioned circumstances, the present invention provides a motor stator in which the turn portion of the winding projecting from the stator core is reliably protected, and moreover, can be installed inexpensively and easily, and a manufacturing method thereof. The purpose is to do.

[0011]

In order to achieve the above object, a motor stator according to the present invention (hereinafter referred to as the present invention) has a winding exposed at both ends of a stator core in an uncured or semi-cured state. It is characterized by comprising a hard sheet which is hardened after being coated on the turn portion of the wire and which is entirely adhered to the turn portion.

As a result, since the turn portion is covered with the hard sheet, the turn portion is surely protected from collision with other objects, rubbing, and the like.

Moreover, since the sheet before covering the turn portion is in an uncured or semi-cured state, it is possible to easily cut the size in accordance with the size of the turn portion and, in some cases, to cut the end. The sheet material can be formed into a size that covers the turn portion by joining or abutting the sheet material, and the sheet material has high flexibility and its utilization efficiency can be improved.

Further, when the turn portion is covered, the sheet is in an uncured or semi-cured state, so that it can be easily deformed into a shape along the turn portion, and at the same time, the sheet is cured and entirely adhered to the turn portion. As described later, since it is possible to adopt a simple procedure in which the uncured or semi-cured thermosetting resin is preliminarily carried on the sheet and the turn portion is covered and then heated, as described below, it is inexpensive. It can be installed easily and easily.

The present invention will be described in detail as follows.

In the adhesive sheet of the present invention, for example, when the winding is impregnated with a varnish in a subsequent step and the winding is fixed by resin molding without providing a heating and solidifying step,
It may be a non-perforated sheet, but if a step of impregnating the winding with varnish and heating and solidifying is provided as a post process to fix the windings to each other at the turn, the varnish will penetrate into the turn. It is preferable that the base material of the adhesive sheet has a large number of openings so that the openings are opened after curing in order to improve the property and average the penetration.

As the base material having such a large number of openings, for example, a cloth such as a woven cloth, a knitted cloth, a non-woven cloth, a synthetic resin sheet having a large number of holes formed by punching, needling or the like is used. However, among these, it is recommended to use a cloth that can be finer and more fully reinforced than racing, and that when covering the turn part, it easily fits into the irregularities of the turn part and is less likely to cause wrinkles or creases. Among the cloths, a mesh cloth is used for the following reasons, that is, a cloth in which the density of the fibers is about 1 to 25 per 25 mm and the fibers of the vertical and horizontal directions do not adhere to each other. Recommended to use.

However, this cloth may be in the form of a mesh,
It does not matter whether the structure is a woven fabric, a knitted fabric, or a non-woven fabric.

That is, the mesh-like cloth has particularly good conformability to the irregularities of the turn portion, and it is easy to cover the turn portion without causing wrinkles or folds, and a varnish impregnation step for fixing the winding and The varnish heat-hardening process can be performed in the same way as the conventional lacing process, and the high opening ratio makes it easy to observe the inner turn of the sheet, and it is possible to visually check winding defects for quality control. It is advantageous in that it has high air permeability, a cooling effect to prevent heat accumulation in the stator, a small bulk specific gravity, and a small amount of material used, so it is possible to reduce material costs, such as varnish and molding resin. The reason for this is that it has high penetrability into the turn portion and that the amount of varnish and molding resin used can be reduced to reduce costs.

As the type of fibers constituting the cloth, inorganic fibers such as glass fibers and silicon oxide (quartz glass) fibers may be used, and organic materials such as polyester, nylon, aramid fibers, cotton, silk and hemp. Fibers may be used, and two or more of these inorganic fibers and organic fibers may be used in combination. However, among these, it is recommended to use glass fibers that can be obtained as a mesh-like woven or knitted fabric at an affordable price despite their high heat resistance and shape retention of the cured sheet.

The shape and size of the adhesive sheet may be any shape and size suitable for covering the turn portion, and can be formed in any shape such as a strip shape or a ring shape. Further, it is preferable to add a linear or wedge-shaped cut to one end side in consideration of the difference between the inner peripheral length and the outer peripheral length of the turn portion. Further, the adhesive sheet need not be shaped and sized so as to cover the entire turn portion with one sheet, and may have a shape to cover the turn portion by adding or abutting a plurality of sheets.

In the present invention, as described above, when the base material of the adhesive sheet has a large number of openings and the openings are opened after curing, the adhesive sheet is covered with the cured adhesive sheet. The sheet can be permeated into the windings to allow the turns to be impregnated with varnish evenly and sufficiently, and the impregnated varnish can be cured by heating to secure the windings to each other, thus ensuring a more secure winding. Can be fixed to.

In the present invention, a so-called self-bonding type winding is used as the winding, and the windings are fixed to each other by self-fusion when the adhesive sheet is cured and bonded to the turn portion. The winding can be more reliably fixed.

Then, the windings are fixed to each other by the varnish or self-bonding as described above, and further, the stator core, the windings and the adhesive sheet are resin-molded, so that the windings can be fixed more reliably. You can The procedure of this resin molding may be the same as the conventional one, and the resin used for this resin molding may be the resin generally used for the resin molding of the motor stator.

Of course, the fixing of the winding by the varnish and the fixing of the winding by self-fusion are omitted, and after the adhesive sheet is cured and adhered to the turn portion, the stator core, the winding and the adhesive sheet are resin-molded. Then, it is possible to further secure the fixing of the winding.

Next, in the method for producing a motor stator according to the present invention (hereinafter referred to as the present invention method), an uncured or semi-cured thermosetting resin is carried on a substrate in order to produce the present invention. The above-described adhesive sheet covers the turn portions of the windings exposed at both ends of the stator core, and is then heated to cure the adhesive sheet and adhere to the turn portions.

Thus, the present invention can be obtained by a simple procedure of covering the turn portion with the adhesive sheet, curing the adhesive sheet by heating in that state, and adhering to the turn portion. It can be covered with a hardened adhesive sheet, and the turn portion is reliably protected from collision with other objects, rubbing, and the like.

Further, since the adhesive sheet before covering the turn portion is the one in which the uncured or semi-cured thermosetting resin is carried on the substrate, the size can be easily adjusted according to the size of the turn portion. Can be cut, and in some cases, the cut pieces can be spliced or abutted together to form a size that covers the turn portion, so that the adhesive sheet can be used without waste and the utilization efficiency can be improved.

Further, the adhesive sheet carrying the uncured or semi-cured thermosetting resin can be easily and easily deformed into a shape along the turn portion, and after the turn portion is covered, it is simply heated. Since the adhesive sheet can be cured in its shape and can be entirely adhered to the turn portion, the construction can be carried out inexpensively and easily.

The method of the present invention will be described in detail below. However, since the detailed description of the base material used in the method of the present invention overlaps with the detailed description of the base material of the present invention, the paper width is It is omitted here to save money.

In the method of the present invention, the uncured state means a so-called A stage (A state) resin state in which the reaction is not advanced and the solvent is simply evaporated, but the semi-cured state is that the reaction is advanced to some extent. In addition to the so-called B stage (B state) resin state, resin particles are physically attached by, for example, electrostatic adsorption force, such as an uncured coating film formed by powder coating (solventless coating). Is bound to
It is used in a broad sense to include the case where they are not bound by a chemical bond such as polymerization or condensation. Further, a sheet in which such an uncured thermosetting resin is carried on a substrate is called an uncured sheet, and a sheet in which a semi-cured thermosetting resin is carried on a substrate is in a semi-cured state. Sheet.

The thermosetting resin used here is not particularly limited as long as it is generally known as a thermosetting resin. For example, polyester resin, epoxy resin, silicone resin, melamine resin, phenol resin, A polyimide resin, a modified product thereof, or a mixture of two or more kinds thereof may be used.

As a method for supporting the uncured or semi-cured thermosetting resin on the substrate, the substrate is attached to a solution in which the thermosetting resin is dissolved by dipping, spraying or the like, and then dried or A or It is possible to increase the wet method to make the resin state of the B stage and the dry method to apply to the base cloth by the powder coating method (solventless coating method).
Which method is adopted is free.

The thermosetting resin carried on the base material is cured by polymerizing or condensing by heating after coating the turn portion with a sheet, and the fibers of the base material are adhered by this curing. This prevents the fibers of the substrate from moving relative to each other, resulting in curing of the sheet. or,
A part of the thermosetting resin flows during heating to bond the turn portion and the fiber of the base material, whereby the sheet is entirely adhered to the turn portion.

The lower limit of the amount of the thermosetting resin supported on the substrate is the minimum amount required for curing the adhesive sheet and adhering it to the turn portion, and for example, 10% by weight or more is preferable. Especially as a stator manufacturing method,
When there is no subsequent step of impregnating the turn portion with varnish and the winding can be fixed by resin molding, it is preferable that the adhesive sheet be stronger, so 30% by weight or more is preferable.

The upper limit of the amount of the thermosetting resin supported on the base material is that the base material of the adhesive sheet has a large number of openings when a step of impregnating the turn portion with varnish is performed later as a manufacturing method of the stator. However, since it is preferable that the openings are opened after curing, a thermosetting resin in an uncured or semi-cured state in such an amount that the openings are opened after curing on a substrate having a large number of openings. Is preferably carried.

The amount of opening of the base material after curing is such that the opening is open before heating.
In addition to containing a so-called blinding amount, the opening is blocked with a thermosetting resin before heating,
The amount of thermosetting resin that flows during heating to open the opening is also included. For example, it is made of glass fibers woven in a mesh shape with the amount of warp (vertical) 16 × 2 and weft (horizontal) 16 driven in. When a cloth is used as the base material, it is preferably about 150% by weight or less.

In particular, as a method of manufacturing a stator, when there is no step of impregnating the turn portion with varnish later and the winding is fixed by resin molding, it is not necessary to open the opening of the adhesive sheet, Since it is preferably stronger, it is preferably about 300% by weight or less.

In the method of the present invention, when an adhesive sheet carrying a thermosetting resin in an uncured or semi-cured state on a base material having a large number of openings after curing is used, After curing the adhesive sheet and adhering it to the turn portion, the opening of the adhesive sheet is opened, so the adhesive sheet is permeated to impregnate the turn portion with varnish, and further, this varnish is heat-cured, The winding can be more reliably fixed.

Further, in the method of the present invention, the winding is constituted by a self-fusion type winding which is fused and fixed to each other by heating.
By simultaneously self-fusing the windings and fixing them to each other when the adhesive sheet is heated, the windings can be more reliably fixed.

Then, in the method of the present invention, after the windings are thus self-cured or fixed to each other by a varnish,
Further, by winding the stator core, the winding, and the sheet with resin, the winding can be fixed more reliably.

Of course, in the method of the present invention, the sheet is heated to cure and bond without self-bonding or fixing of the winding with a varnish, and then the stator core, the winding and the sheet are further resin-molded. It is possible to more securely fix the winding to be wound.

By the way, in the method of the present invention, the method of heating the adhesive sheet coated with the turn portion is not particularly limited, and for example, it is heated using an autoclave, an oven or the like, or a heating head heated by a heat source is used as a heating source. To remove the adhesive sheet from the heat source and heat it by approaching or contacting the adhesive sheet, or by heating the adhesive sheet to the heating head that is in contact with the heat source, or by directly approaching or contacting the adhesive sheet with the heat source. The method of heating can be increased, and which of these can be used is free.

Although there are various heat sources, it is recommended to use an electromagnetic induction heater which can obtain high energy in a short time.

When the heating head is used, it is preferable that the heating head and the adhesive sheet are brought into contact or face each other over a wide area in order to uniformly heat the adhesive sheet and shorten the heating time. Insert the adhesive sheet and the turn portion into the groove of the heating head having the annular groove that covers both the inner and outer peripheral surfaces and the end surface of the turn portion,
It is preferable to heat the adhesive sheet via the heating head in a state where both the inner and outer peripheral surfaces and the end surfaces of the adhesive sheet face or contact the groove surface of the heating head.

As described above, the present invention is provided with the adhesive sheet which is hardened in a state where the turn portions of the winding exposed at both ends of the stator core are covered and which is entirely adhered to the turn portions. The adhesive sheet thus provided has the effect of reliably protecting the turn portion of the winding from contact with other objects.

After covering the turn portion with an adhesive sheet,
In that state, the adhesive sheet can be hardened and the turn portion can be adhered to the turn portion by a simple procedure. Therefore, it is not necessary to prepare many kinds of molds, and the operation can be performed easily at low cost.

Further, since the adhesive sheet before coating is in an uncured or semi-cured state, it is possible to easily cut the dimensions, join or butt according to the size of the turn portion, In addition to improving the utilization efficiency of the adhesive sheet, the adhesive sheet can be easily conformed to the unevenness of the turn portion.

Further, in the method of the present invention, the turn portion of the winding exposed on both ends of the stator core is coated with an adhesive sheet having a base material carrying a thermosetting resin in an uncured or semi-cured state, and then heated. Since the adhesive sheet is hardened and adhered to the turn portion by means of the above, in addition to the effect that the present invention can be obtained in a short time by a simple procedure, the effect obtained by the present invention can be obtained. Obtainable.

[0050]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention and the method of the present invention will be described in detail below with reference to the drawings, but the present invention is not limited thereto.

In the method of manufacturing a motor stator according to one embodiment of the method of the present invention shown in the flow chart of FIG. 1, a resin mixing step S1, a resin impregnation step S2, a drying step S3, a cutting step S4, a turn portion covering step S5, The heating step S6 is sequentially performed.

In the resin compounding step S1, 100 parts by weight of an unsaturated polyester resin (tele-type polyester resin, manufactured by Nippon Yupica, trade name: U-8523), a cross-linking agent (Dup Monomer, manufactured by Toto Kasei, trade name: Dap Tote) An unsaturated polyester resin blend was obtained by dissolving 14 parts by weight of a monomer) and 7.8 parts by weight of a catalyst (peroxide, manufactured by Explosives Nuri, trade name: Kayadox B-CH50) in a solvent (methyl ethyl ketone).

In the resin impregnation step S2, this polyester resin blend is made into a blind glass cloth [entangled weave, driving amount: warp (vertical) 16 × 2, weft (horizontal) 16, manufactured by Unitika Yum, product name: L90FT1000]. It was applied by a kiss coater and impregnated to obtain an adhesive sheet having a resin content of 54.9%. This resin content was adjusted by adjusting the gap of the kiss coater, the base of the polyester resin blend, and the impregnation rate.

Then, in a drying step S3, this adhesive sheet was dried at 80 ° C. for 5 minutes to obtain a B-stage polyester adhesive sheet.

In the cutting step S4, as shown in FIG. 2, the polyester adhesive sheet 1 of the B stage has a width of, for example, 3
It was cut into a size of 0 mm and a length of 170 mm, and a cut 2 having a length of about 15 mm was made from one side edge in the width direction at intervals of about 30 mm in the longitudinal direction. The direction of the cut line of the adhesive sheet 1 may be parallel to the fiber direction of the glass cloth 3,
In order to prevent the edge ears from fraying, a bias cutting inclined by about 30 degrees with respect to the fiber direction of the glass cloth 3 was adopted.

In the turn portion coating step S5, as shown in FIG. 3, a portion of the winding sheet 5 exposed from both ends of the stator core 4 having an outer diameter of 57 mm and having no cut 2 of the adhesive sheet 1 on the outer periphery of the turn portion 6 thereof. After winding, the part having the cut 2 is folded inward, and the outer peripheral surface, the end surface and the inner peripheral surface of the turn portion 6 are all covered with the adhesive sheet 1. The lead wire is drawn out between the winding start and the winding end of the adhesive sheet 1.

Here, since the adhesive sheet 1 is a semi-cured sheet carrying a semi-cured thermosetting resin, the conformability to the unevenness of the turn portion 6 is very high,
It is possible to bend and closely adhere along the surface of the turn portion 6 almost entirely without generating wrinkles or creases. Moreover, the adhesive sheet 1 is adhered to the turn portion 6 by being pressed against the turn portion 6, and is held in a shape covering the turn portion 6.

In the heating step S6, as shown in FIG. 4, the heating head 7 is attached to the turn portion 6 covered with the adhesive sheet 1.
After being set, it is placed on the electromagnetic induction heater 8 and heated. The heating head 7 is an inner tube 7a inserted into the turn portion 6 and the inside of the adhesive sheet 1, and an outer ring that is fixed to the inner tube 7a while being pressed against the end surface of the adhesive sheet 1 by the outer tube of the inner tube 7a. It is composed of a plate-shaped end plate 7b and an outer pipe 7c that covers the outer periphery of the turn portion 6. Between the inner pipe 7a, the end plate 7b, and the outer pipe 7c, the adhesive sheet 1 and both the inner and outer peripheral surfaces of the turn portion 6 are formed. And an annular groove covering the end face is formed.

The outer tube 7c is divided into a plurality of pieces, for example, four pieces in the circumferential direction. After pressing the outer tube 7c against the outer peripheral surface of the adhesive sheet 1, for example, a polyester adhesive tape is wrapped and tightened. The inner pipe 7a is pressed against the outer peripheral surface of the inner pipe 7a so that the inner pipe 7a is fixed to the turn portion 6 and the adhesive sheet 1 covering the turn portion 6. Also, the turn portion 6 of the inner pipe 7a, the end plate 7b, and the outer pipe 7c.
By subjecting the surface facing the
The thermosetting resin prevents the adhesive sheet 1 and the heating head 7 from adhering to each other.

As the electromagnetic induction heater 8, a commercial electric cooker (manufactured by Sanyo Electric Co., Ltd., trade name: TIC-D201 2KW)
The heating head 7 and the stator were placed on the central portion of the top plate of the electromagnetic induction heater 8 with the turn portion 6 on which the heating head 7 was set facing down, and electricity was supplied for 2 minutes at the maximum output (2 KW). At this time, the temperature of the heating head 7 was raised to 140 to 150 ° C., for example, as shown in FIG.

By thus heating the adhesive sheet 1 and the outer peripheral surface, the end surface and the inner peripheral surface of the turn portion 6 with the heating head 7, the adhesive sheet 1 is uniformly heated in a short time. Then, by heating the adhesive sheet 1,
The thermosetting resin of the adhesive sheet 1 is cured, and along with this curing, the glass fibers of the glass cloth 3 as a base material are adhered to each other at the crossing points of the history, whereby the adhesive sheet 1 is cured and the thermosetting A part of the resin flows between the glass cloth 3 and the turn portion 6 and is cured, so that the adhesive sheet 1 is entirely adhered to the turn portion 6. That is, the motor stator according to the embodiment of the present invention can be obtained.

Since the motor stator thus obtained does not perform lacing, there is no risk of problems with lacing, such as the winding being cut by a needle or being damaged.

Further, as a result of the turn portion 6 being finely covered with the mesh-like hard adhesive sheet 1, the coil protecting function of the adhesive sheet 1 is significantly higher than the coil protecting function of the racing yarn, and the adhesive sheet is also provided. 1 glass cloth 3
Since the eye of the adhesive sheet 1 is opened and the opening ratio is high, the turn portion 6 inside the eye of the glass cloth 3 of the adhesive sheet 1 is opened.
Can be easily visually observed to visually check the winding defect, which is advantageous in quality control, and a cooling effect for preventing heat accumulation in the stator can be expected.

Further, as a result of the turn portion 6 being covered with the mesh-like hard adhesive sheet 1, the turn portion 6 is uniformly impregnated with the varnish passing through the adhesive sheet 1 in the same manner as in the conventional lacing process. By heating and curing the varnish, the shape of the winding can be retained more reliably.

In this case, the resin is highly permeated into the turn portion of the varnish, the molding resin and the like, and the advantage that the amount of the varnish, the molding resin and the like used can be reduced and the cost can be reduced.

In addition, since the bulk specific gravity of the adhesive sheet 1 is small and the amount of material used is small, there is an advantage that the material cost can be reduced.

In the above embodiment, the heating head 7 is brought into contact with the electromagnetic induction heater 8 which is a heat source, and the adhesive sheet 1 is heated by the electromagnetic induction heater 8 via the heating head 7. However, it is heated by the heat source. The adhesive sheet 1 may be heated by moving the heating head 7 that has accumulated heat away from the heat source so as to approach or contact the adhesive sheet 1. Alternatively, a heating head having a built-in heat source may be used. It may be heated by such as.

[0068]

As described above, according to the present invention, the adhesive is hardened in a state that the turn portions of the winding exposed at both ends of the stator core are covered with the adhesive and is completely adhered to the turn portions. Since the sheet is provided, it is possible to obtain an effect that the adhesive sheet having a hardened turn portion can be surely protected from collision with other objects, rubbing, and the like.

When the turn portion is covered, since the adhesive sheet is in an uncured or semi-cured state, it can be easily deformed into a shape along the turn portion, and at the same time, the sheet is cured and entirely adhered to the turn portion. To do so, as will be described later, it is possible to employ a simple procedure in which the sheet is preliminarily loaded with an uncured or semi-cured thermosetting resin, and the turn portion is covered and then heated. The effect that it can be constructed easily at low cost can be obtained.

Moreover, since the sheet before coating the turn portion is in an uncured or semi-cured state, it is not necessary to prepare many kinds of molds corresponding to the size of the motor, and the turn portion can be easily It is possible to cut the size according to the size, and it is also possible to form the size that covers the turn part by splicing or abutting the end pieces, increasing the flexibility of the sheet material and improving its utilization efficiency. By reducing the material cost, the effect of cost reduction can be obtained.

Of course, since the winding can be fixed by the hardened adhesive sheet without using the lacing, it is possible to obtain the effect of preventing the winding from being cut or damaged during the lacing.

In the present invention, when the base material of the adhesive sheet has a large number of openings and the openings are opened after curing, the varnish is then passed through the adhesive sheet in the same manner as in the conventional method. Then, the winding can be more reliably fixed by impregnating the turn portion and heat-curing, and moreover, the varnish can be uniformly impregnated into the turn portion, so that the amount of the varnish to be impregnated is reduced. It is possible to obtain the effect that the cost can be further reduced.

In this case, if the base material is a mesh cloth, the adhesive sheet has good conformability to the irregularities of the turn portion, and the adhesive sheet can be easily curved along the irregular surface of the turn portion without causing wrinkles or creases. Therefore, it becomes easier to adhere the adhesive sheet to the surface of the turn part over the entire surface, which is advantageous in fixing the turn part, and visually observing the turn part covered with the adhesive sheet. Easy to visually check for winding defects, which is advantageous in quality control, highly breathable and has a cooling effect to prevent heat accumulation in the stator, compared to the case where the turns are covered in a sealed manner. The amount of material used can be reduced, and the effect of reducing material cost and cost can be obtained.

Further, in this case, if the mesh-like cloth as the base material is made of glass fiber, the mesh-like woven cloth can be reasonably priced even though the heat resistance and the shape retention of the cured sheet are high. To the advantage that knitted fabrics are available.

In the present invention, when the winding is hardened and is fixed to each other by heating and hardening the varnish impregnated in the turn part through the adhesive sheet adhered to the turn part, the winding is fixed. The effect that the wire can be more reliably fixed is obtained.

Further, in the present invention, even when the windings are fixed to each other by self-fusion when curing the adhesive sheet and adhering to the turn part, the windings are more surely fixed by the self-fusion of the windings. The effect that can be obtained is obtained.

In these cases, the stator core,
When the winding and the adhesive sheet fixed to each other by varnish or self-fusion are resin-molded, the effect that the winding can be fixed more reliably can be obtained.

In the present invention, when the stator core, the winding, and the adhesive sheet are resin-molded without fixing the winding by varnish or self-fusion, the winding can be more surely fixed by the resin molding. The effect is obtained.
Further, in this case, when the base material of the adhesive sheet has a large number of openings and the openings are opened after curing, the penetration of the mold resin into the winding is averaged,
The amount of resin used can be reduced, and the effect of further lowering the cost can be obtained.

Next, according to the method of the present invention, after covering the turn portions of the winding exposed on both ends of the stator core with an adhesive sheet having a base material carrying a thermosetting resin in an uncured or semi-cured state, Since the adhesive sheet is cured and adhered to the turn portion by heating, the present invention can be inexpensively manufactured by a simple procedure of coating the turn portion of the winding with an uncured or semi-cured adhesive sheet and then heating. Therefore, various effects obtained by the above-described present invention can be obtained.

In the method of the present invention, when an adhesive sheet carrying a thermosetting resin in an uncured or semi-cured state on a base material having a large number of openings after curing is used, is used. Can obtain the present invention in which the base material of the adhesive sheet has a large number of openings and the openings are opened after curing, and the varnish is then passed through the adhesive sheet in the same manner as in the past. The winding part can be more reliably fixed by impregnating the turn part with heat and curing by heating, and the varnish can be uniformly impregnated into the turn part, so that the amount of varnish to be impregnated is reduced. It is possible to obtain the effect that the cost can be further reduced.

In this case, if a mesh-like cloth is used as the base material, the adhesive sheet has good conformability to the irregularities of the turn portion, and the adhesive sheet is curved along the irregular surface of the turn portion without causing wrinkles or creases. Since it becomes easier to adhere the adhesive sheet to the surface of the turn part over the entire surface, it is advantageous in securing the turn part, and the turn part covered with the adhesive sheet can be visually observed. It is easy to observe, and it is possible to visually check for defects in the winding, which is advantageous for quality control, has high ventilation and has a cooling effect that prevents heat accumulation in the stator, and when covering the turn part in a sealed state. In comparison, the amount of material used can be reduced, and the effect of reducing the material cost and cost can be obtained.

In particular, when a mesh-like cloth made of glass fiber is used as the base material, a mesh-like woven or knitted cloth is available at a reasonable price despite its high heat resistance and shape retention of the cured sheet. The advantage that can be obtained is obtained.

As described above, in the method of the present invention in which the opening is opened after curing, the adhesive sheet is cured by heating and is adhered to the turn portion, and then the adhesive sheet is passed through the turn sheet. When the part is impregnated with varnish and the varnish is heat-cured, the windings can be bonded and fixed to each other by the varnish, and the hardening can be obtained so that the winding can be more reliably fixed.

Further, in the method of the present invention, the winding is constituted by a self-fusion type winding which is fused and fixed to each other by heating.
Even when the windings are self-fused and fixed to each other at the same time when the adhesive sheet is heated, the windings can be fixed to each other and the windings can be more reliably fixed.

In the method of the present invention in which the windings are fixed to each other by varnish or self-fusion, when the windings are self-cured or fixed to each other by varnish, the stator core, the windings and the sheet are further resin-molded. The effect that the winding can be more reliably fixed by the mold resin is obtained.

Further, in the method of the present invention, the sheet is cured by heating and adhered without fixing the winding by varnish or self-fusion, and then the stator core, the winding and the sheet are further resin-molded. In that case, the effect that the winding can be more reliably fixed by the molding resin is obtained.

In the method of the present invention, in particular, after heating the inner peripheral surface, the end surface and the outer peripheral surface of the turn portion with an adhesive sheet, heating having an annular groove covering the inner and outer peripheral surfaces and the end surface of the adhesive sheet and the turn portion. When the adhesive sheet and the turn portion are inserted into the groove of the head and the adhesive sheet is heated via this heating head, the adhesive sheet is heated on average, and the heating time can be shortened to, for example, 2 minutes or less. The effect can be obtained.

[Brief description of drawings]

FIG. 1 is a flow diagram of the method of the present invention.

FIG. 2 is a development view of an adhesive sheet used in the method of the present invention.

FIG. 3 is a perspective view showing a procedure of a coating step of the method of the present invention.

FIG. 4 is an exploded perspective view showing a procedure of a heating step of the method of the present invention.

FIG. 5 is a temperature change characteristic diagram of the heating head used in the method of the present invention.

[Explanation of symbols]

 S1 Resin compounding step S2 Resin impregnating step S3 Drying step S4 Cutting step S5 Turn part covering step S6 Heating step 1 Adhesive sheet 2 Cut 3 Glass cloth 4 Stator core 5 Winding 6 Turn part 7 Heating head

Claims (17)

[Claims] 1. A motor stator comprising an adhesive sheet which is hardened in a state of covering a turn portion of a winding exposed at both ends of a stator core and which is entirely adhered to the turn portion. 2. The base material of the adhesive sheet has a large number of openings, and the openings are opened after curing.
Motor stator as described in. 3. The motor stator according to claim 2, wherein the base material of the adhesive sheet is a mesh cloth. 4. The motor stator according to claim 3, wherein the base material is made of glass fiber. 5. The motor stator according to claim 2, wherein the windings are fixed to each other by heating and hardening a varnish which penetrates the sheet and impregnates the turn portion. 6. The motor stator according to claim 2, wherein the windings are fixed to each other by a self-fusing resin when the adhesive sheet is cured and adhered to the turn portion. 7. The motor stator according to claim 5, wherein the stator core, the varnish, the windings fixed to each other by self-bonding and the adhesive sheet are resin-molded. 8. The motor stator according to claim 1, wherein the stator core, the winding and the adhesive sheet are resin-molded. 9. An adhesive sheet in which a thermosetting resin in an uncured or semi-cured state is carried on a base material is coated on the turn portions of the windings exposed at both ends of the stator core, and then the adhesive sheet is heated. A method of manufacturing a motor stator, which comprises curing and adhering to a turn portion. 10. The adhesive sheet according to claim 9, wherein a base material having a large number of openings has an amount of an uncured or semi-cured thermosetting resin carried by the openings so that the openings are opened after curing. Motor Stator Manufacturing Method. 11. The method of manufacturing a motor stator according to claim 9, wherein a mesh cloth is used as the base material. 12. The method for producing a motor stator according to claim 10, wherein a glass cloth woven in a mesh shape is used as the base material. 13. The adhesive sheet according to claim 9, wherein the adhesive sheet is cured by heating and is adhered to the turn portion, the adhesive sheet is permeated to impregnate the turn portion with varnish, and the varnish is further cured by heating. The method for manufacturing the motor stator according to any one of claims 1. 14. The windings are self-bonding type windings that are fused and fixed to each other by heating, and the windings are simultaneously self-fused and fixed to each other when the adhesive sheet is heated. 13. The method for manufacturing a motor stator according to any one of 12. 15. The method of manufacturing a motor stator according to claim 13, wherein the windings are self-cured or fixed to each other with a varnish, and then the stator core, the windings and the sheet are resin-molded. 16. The method of manufacturing a motor stator according to claim 9, wherein the stator core, the winding, and the sheet are resin-molded after the sheet is cured by heating and adhered. 17. A groove of a heating head having an annular groove covering the inner and outer peripheral surfaces and the end surface of the turn portion after the inner peripheral surface, the end surface and the outer peripheral surface of the turn portion are covered with the adhesive sheet. The method for manufacturing a motor stator according to claim 9, wherein the adhesive sheet and the turn portion are inserted, and the adhesive sheet is heated via the heating head.