JPH0923601A - Rotating electrical equipment - Google Patents

Abstract

(57) [Summary] [Construction] In a rotary electric device having a housing for holding a stator and a rotor, the winding part 4 is constituted by a self-lubricating enamel wire, and the winding part 4 is insulated from ground and between phases. Is insulated with an insulating sheet obtained by laminating a polyethylene-2,6-naphthalate film and an aromatic polyamide non-woven fabric, or an insulating sheet obtained by laminating a polyphenylene sulfide film on both sides of a polyethylene terephthalate (PET) film. Insulated varnish cured product 10 in which the winding portion 4 and the insulating sheet are impregnated and cured
Electrical equipment held in. [Effect] The insulating sheet constituting the slot insulator 3 is excellent in heat resistance, has good mechanical insertability into the slot 2 similar to a PET single film, and the self-lubricating enamel wire has the enamel of the slot portion or the coil end portion. Little damage to the film. Further, since the insulating varnish 10 has a good compatibility with the insulating sheet and the enamel wire, it is possible to provide the one which satisfies the heat resistance of the F-type insulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric device suitable for F type (155 ° C.) insulation, and in particular, it uses a wear-resistant self-lubricating enamel wire for a winding part, The present invention relates to a rotary electric device that uses an insulating sheet in which two types of organic insulating materials are bonded together as an interphase insulating material and further uses an insulating varnish having excellent heat resistance.

[0002]

2. Description of the Related Art An example of a conventional F-type insulated winding structure for a rotary electric device in which a randomly wound winding is housed in an iron core slot of a stator for a rotary electric device having a rotor and a rotor is described. .

As shown in FIG. 1, in a semi-closed slot 2 of an iron core 1, for example, a cross-section made of a wholly aromatic polyamide (Nomex manufactured by duPont) or a polyethylene terephthalate (PET) sheet or the like is used. A slot insulator 3 having a substantially U-shape is provided, and a winding 4 of random winding made of synthetic resin enameled wire such as ester imide wire or polyester amide imide wire is housed in the slot insulator 3. Then, an insulating wedge 5 having a cross section of Nomex or the like formed in a substantially arc shape is driven into the upper portion of the winding 4
And the insulation treatment between the stator core 1 and the stator core 1 are performed to produce the stator part. Also, an aluminum die-cast rotor part using the iron core of the rotor made of punched silicon steel plate is manufactured.

Next, the stator portion is inserted into the housing made of a cast product which has been heated and expanded to perform shrink fitting, and the rotor portion is further incorporated to complete a rotary electric device.

The winding 4 is a solvent-type insulating varnish containing an organic solvent such as styrene, toluene, xylene, or
A solventless insulating varnish is immersed and impregnated to impregnate the inside of the slot 2 and the winding end portion (not shown) with the insulating varnish 10 and heat-cured to integrally fix them.

Japanese Patent Laid-Open Nos. 594002 and 59-4
No. 003 and Japanese Patent Laid-Open No. 59-63944 disclose an electric winding of F type insulation for a general-purpose motor, which is a combination of an insulating sheet and a water-soluble insulating varnish.

[0007] However, Japanese Patent Laid-Open No. 59-4002 discloses that
As an insulating sheet, a laminate of a polyester sheet and an ethylene tetrafluoride sheet is also disclosed in JP-A-59-40.
JP-A No. 03-603 uses a laminate of a polyester sheet and a polypropylene sheet.
Japanese Patent No. 3944 uses an insulating sheet obtained by coating and baking an aramid resin on a polyester sheet.

[0008]

Each of the above-mentioned prior arts is characterized by using a water-soluble insulating varnish, and it takes a long time to cure by heating, and there is a risk that water remains after curing. , It becomes a problem in the closed type motor.

With the improvement of the coil space factor (ratio of the winding cross-sectional area to the slot cross-sectional area) and the curvature at the coil end due to the reduction in size and weight of the rotary electric device, the enamel wire of the insulating structure of FIG. If the slippage is poor, there is a problem that the slot portion is easily rubbed when the coil is wound, and the enameled wire is difficult to insert due to the high space factor of the coil and the damage is large.

Further, when the insulator is a Nomex sheet alone, there is no problem in heat resistance, but there is a problem that the mechanical insertability into the slot is poor and the material cost is high because the rigidity is relatively low. . Further, in the case of the PET sheet, the mechanical insertability into the slot is good, but the heat resistance is limited to the type B insulation.

An object of the present invention is to use a heat-resistant and self-lubricating enameled wire and an insulation sheet which satisfies the heat resistance of F-type insulation and has a good mechanical insertion property into a slot. An object of the present invention is to provide a rotary electric device suitable for F-type insulation using an insulating varnish having good crackability, good compatibility with an enameled wire, and good adhesive strength.

Another object of the present invention is to provide a rotary electric device whose housing is adapted to the above-mentioned type F insulation of an aluminum alloy die casting.

[0013]

The gist of the present invention to achieve the above object is as follows.

In a rotary electric device having a housing for holding a stator and a rotor, the winding portion is composed of a self-lubricating enamel wire, and the insulation between the ground and the phase of the winding portion is polyethylene-2,6-naphthalate. An insulating sheet obtained by laminating a film (hereinafter referred to as PEN) with an aromatic polyamide nonwoven fabric, or an insulating sheet obtained by laminating a polyphenylene sulfide (hereinafter referred to as PPS) film on both sides of a polyethylene terephthalate (hereinafter referred to as PET) film. A rotating electric device which is insulated and is held by a cured product of an insulating varnish impregnated and cured with the winding portion and the insulating sheet.

The thickness of the insulating sheet obtained by laminating the PEN film and the aromatic polyamide non-woven fabric is 0.05 to 0.3.
5 mm, and the PEN film has a total thickness of 64 to
A film having a film thickness of 82% is desirable.

Also, PPS is formed on both sides of the PET film.
The thickness of the insulation sheet with the film attached is 0.05-0.
It is preferably 35 mm and the thickness of both sides of the PPS film is 20 to 45% of the total thickness.

The insulating varnish can be applied to F-type insulation by impregnating it with an insulating varnish having good crack resistance, good compatibility with an enamel wire, and good adhesive strength, and heat-curing the varnish. For example, insulating varnish of unsaturated polyester resin or unsaturated epoxy ester resin is desirable. In addition, the insulating varnish has a glass transition temperature of 120 ° C. or lower and a linear expansion coefficient of 7.0 × 1.
The initial elastic modulus at room temperature is 0 to ⁵ / ° C or less and 10
It is preferably 0 to 350 kg / mm ² .

The self-lubricating enameled wire includes, but is not limited to, heat resistance, chemical resistance, surface lubricity, or
A material that is suitable for F-type insulation, which has excellent wear resistance and mechanical insertability into the slot, is preferable.

The housing holding the stator is preferably made of aluminum alloy die casting.

[0020]

By using the self-lubricating enamel wire as the enamel wire, the enamel wire coating is less damaged, and both heat resistance and cost can be achieved.

By using an insulating sheet in which PEN and an aromatic polyamide non-woven fabric are pasted together, or an insulating sheet in which PPS is pasted on both sides of PET, the rigidity thereof is almost the same as that of PET, so that it is comparable to PET. Mechanical insertability into the slot is obtained.

Further, each of the above-mentioned insulating sheets has good compatibility with the above-mentioned insulating varnish, and the deterioration of the characteristics due to heat deterioration is small. Initially, the insulating sheet had good chemical resistance to styrene in the insulating varnish, and moreover, PEN
In the case of an insulating sheet obtained by laminating a film and an aromatic polyamide non-woven fabric, heat resistance is maintained by the aromatic polyamide non-woven fabric, and the PEN film improves the rigidity as a whole to improve machine insertability.

In the case of an insulating sheet in which PPS films are attached to both sides of a PET film, sandwiching PET with PPS improves the small tear strength with PPS alone, and also interrupts the supply of oxygen to PET. As a result, heat deterioration can be suppressed. By these,
It is considered that an insulating sheet that satisfies the heat resistance of class F insulation can be obtained as a whole.

Considering the stress during operation, which is particularly important among the mechanical forces acting on the stator windings of the rotary electric device,
The stress due to heat cycle and electromagnetic force may be mentioned. The deterioration due to heat cycle is due to the difference in thermal expansion between the insulating layer and the conductor. Further, although there is abrasion and peeling of the insulating layer due to electromagnetic force, electromagnetic vibration during normal operation is considered.

With respect to the above stress, it is possible to provide an insulating varnish which is satisfactory by using an unsaturated epoxy ester resin or an unsaturated polyester resin having high adhesive strength, crack resistance and chemical resistance. .

The linear expansion coefficient of the cured product of the insulating varnish is 7.0 ×
The initial elastic modulus at 10 to ⁵ / ° C or less and room temperature is 10
0 to 350 kg / mm ² , and glass transition temperature is 12
By selecting one below 0 ° C., the thermal stress generated during the heat cycle of the winding treated with the insulating varnish is
It can be further reduced, and the heat resistance of the F-type insulation can be achieved.

Although the housing of the conventional rotary electric device is made of cast iron, the aluminum alloy die-cast housing has better heat dissipation (heat conductivity) than the cast iron housing, and therefore, even if the same F class insulating material is used. Since compact insulation can be used, it is possible to use a housing of a grade that is one step smaller than that of a cast iron housing, so that the housing can be downsized.

Further, according to the die casting method, the thin and thick portions as designed can be accurately formed,
It is possible to shorten the manufacturing process without requiring much machining. Moreover, since aluminum alloy has a smaller specific gravity than cast iron, it can be made lighter.

[0029]

[Embodiment 1] FIG. 1 shows a schematic sectional view of a slot portion of a stator inserted in a housing of a rotary electric device according to the present invention. The insulating sheet 1 used in this example is shown in FIG.
1 shows a sectional configuration diagram of 1.

An insulating sheet 11 in which an aromatic polyamide nonwoven fabric 13 having a thickness of 50 μm is attached to one surface of a PEN film 12 having a thickness of 125 μm is formed into a substantially U-shape and provided as a slot insulator 3 in the slot 2.

A winding 4 made of a self-lubricating amideimide overcoat esterimide wire (Hitachi Cable: AI-EIW-E) is inserted into the slot insulator 3, and the insulating sheet 11 is cross-sectioned. An insulating wedge 5 formed in a substantially circular arc shape is driven in, and the inside of the slot 2 and the end of the winding are impregnated with an unsaturated epoxy ester varnish (NV-5502: Nitto Denko) 10 and then 10
It was heat-cured at 0 to 160 ° C. and integrally fixed to the iron core 1 to manufacture a stator.

Next, an iron core of a rotor made of a punched silicon steel plate was produced by an aluminum die casting method, and this was heated (120 to 250 ° C.) and inserted into an expanded casting housing to be shrink-fitted. A rotary electric device was completed by incorporating the rotor portion.

Further, the slot insulating sheet 11 (12
A 5 μm PEN film 12 having a 50 μm aromatic polyamide nonwoven fabric 13 bonded to one side thereof was subjected to an insulating varnish treatment under the same conditions as those for the above rotary electric device to prepare a test piece for a tensile test.

The deterioration characteristic of the tensile strength of the insulating sheet 11 is shown as the characteristic A in FIG. 4, and the Arrhenius plot is also the characteristic when the time until the initial tensile strength is 50% at each deterioration temperature is the life. It is shown as A in FIG.

As shown by the characteristic A in FIG. 4, the strength reduction is remarkably improved as compared with Comparative Example 1 described later, and the heat resistance temperature corresponding to 20,000 hours in FIG. It was confirmed that the product has sex.

The tensile test of the insulating sheet is 15 m wide.
A test piece of m × 200 mm in length was manufactured by Shimadzu Corporation DSS-
Distance between check 100 using 5000 type autograph
mm, and the pulling speed was 200 mm / min. In the deterioration test, the test piece was suspended in a hot-air circulation type constant temperature bath, taken out after a predetermined time had passed, and the tensile test was performed. In addition, the tensile test showed the average value of five test pieces at 25 degreeC.

Example 2 A stator part was produced in the same manner as in Example 1 except that a PEN film having a thickness of 175 μm was used. In addition, the deterioration characteristic of the tensile strength of the insulating sheet obtained by processing and curing the unsaturated epoxy ester varnish (NV-5502 manufactured by Nitto Denko) is shown in the characteristic B of FIG.

Also, FIG. 6 shows the Arrhenius plot when the life is defined as the time until 50% of the initial tensile strength at each deterioration temperature is taken as the characteristic B.

As shown by the characteristic B in FIG. 4, the reduction in strength is improved as compared with Comparative Example 1 described later, and the heat resistance temperature corresponding to 20,000 hours in FIG. It was confirmed to have.

Example 3 A sectional view of the insulating sheet 18 used in this example is shown in FIG. PET with a film thickness of 188 μm
Deterioration characteristics of tensile strength measured by using a test grain produced in the same manner as in Example 1 except that the insulating sheet 18 having the PPS film 20 of 50 μm bonded to both surfaces of the film 19 was used as the slot insulator 3. Is shown in the characteristic D of FIG. In addition, the initial tensile strength at each deterioration temperature is 50
The characteristic A of FIG. 6 shows an Arrhenius plot when the life until the time until it becomes% is taken as the life.

As can be seen from the characteristic D of FIG. 5, the decrease in strength is remarkably improved as compared with Comparative Example 2 described later, and the heat resistant temperature corresponding to 20,000 hours in FIG. It was confirmed to have heat resistance.

[Example 4] An insulating sheet produced in the same manner as in Example 1 except that the insulating sheet 18 in which the PPS film 20 having a thickness of 38 µm was adhered to both sides of the PET film 19 having a thickness of 188 µm was used as the slot insulator 3. The characteristic of deterioration of the tensile strength of is shown in characteristic E of FIG. Further, characteristic A of FIG. 6 shows an Arrhenius plot when the life is defined as the time until the initial tensile strength reaches 50% at each deterioration temperature.

As can be seen from the characteristic E of FIG. 5, the decrease in strength is improved as compared with Comparative Example 2 described later, and the heat resistance temperature corresponding to 20,000 hours in FIG. It was confirmed to have heat resistance.

[Example 5] An insulating sheet produced in the same manner as in Example 1 except that the insulating sheet 18 in which the PPS film 20 having a thickness of 25 µm was adhered to both sides of the PET film 19 having a thickness of 188 µm was used as the slot insulator 3. Deterioration characteristics of the tensile strength of No. 4 are shown in a characteristic F of FIG. Further, an Arrhenius plot when the life is defined as the time until the initial tensile strength reaches 50% at each deterioration temperature is shown as a characteristic F in FIG.

As can be seen from the characteristic F of FIG. 5, the decrease in strength is improved as compared with Comparative Example 2 described later, and the heat resistance temperature corresponding to 20,000 hours in FIG. It was confirmed to have heat resistance.

[Comparative Example 1] A deterioration characteristic of tensile strength of an insulating sheet manufactured in the same manner as in Example 1 except that a PEN film having a thickness of 260 μm was used as a slot insulator is shown as a characteristic C in FIG. Further, characteristic C of FIG. 6 shows an Arrhenius plot when the life is defined as the time until the initial tensile strength reaches 50% at each deterioration temperature.

As can be seen from the characteristic C in FIG. 4, the decrease in strength is large, and the heat resistant temperature corresponding to 20,000 hours in FIG.
It was confirmed that the temperature did not reach the temperature of ℃ and the heat resistance of the F-type insulation was not provided.

[Embodiment 6] Except for using the insulating sheet 18 in which the PPS film 20 of 16 μm is adhered on both sides of the PET film of 188 μm as the slot insulator 3,
The characteristic G of the tensile strength of the insulating sheet manufactured in the same manner as in Example 1 is shown in FIG. In addition, characteristic A of FIG. 6 shows an Arrhenius plot when the life is defined as the time until the initial tensile strength reaches 50% at each deterioration temperature.

As can be seen from the characteristic G in FIG. 5, the decrease in strength is a little larger than in Examples 1 to 5, and the heat resistance temperature corresponding to 20,000 hours in FIG. 6 is 149 ° C., which is the heat resistance of the F-type insulation. Was confirmed to be somewhat low.

This is probably because the thickness of the PPS film laminated on both sides of the PET film was as thin as 16 μm, so that it was not possible to sufficiently block the diffusion of oxygen into the internal PET film during thermal deterioration. .

[Embodiment 7] The same as Embodiment 1 except that the insulating varnish impregnated and cured in the slot 2 and the winding end portion of FIG. 1 is changed to unsaturated polyester varnish (manufactured by Hitachi Chemical Co., Ltd .: WP-435H). The deterioration characteristics of tensile strength of the insulating sheet produced in the same manner were measured.

The tensile strength of this example is clearly smaller than that of Comparative Example 1 at each deterioration temperature, and is determined by an Arrhenius plot with the time until the tensile strength at each deterioration temperature reaches 50% of the initial value as the life. The heat resistant temperature for 20,000 hours was 157 ° C.

Example 8 Example 3 was repeated except that an unsaturated polyester varnish (WP-435H manufactured by Hitachi Chemical Co., Ltd.) was used as the insulating varnish impregnated and hardened inside the slot 2 and the winding end of FIG. The deterioration characteristics of the tensile strength of the insulating sheet prepared in the same manner were examined.

The tensile strength of this example is clearly smaller than that of Comparative Example 1 at each deterioration temperature, and the time until the tensile strength at each deterioration temperature reaches 50% of the initial value is the life, and the Arrhenius plot is obtained. The obtained heat resistant temperature of 20,000 hours was 158 ° C.

Example 9 In order to measure the thermal stress generated during the heat cycle of the winding conductor treated with the insulating varnish, a self-lubricating amide imide overcoat ester imide wire (manufactured by Hitachi Cable: 1AI-EIW- E) to prepare a bi-farer coil, impregnating it with an unsaturated epoxy ester varnish (NV-5502 manufactured by Nitto Denko),
Cured at 150 ° C. for 2 hours.

A heat cycle test was conducted on this bi-farer coil by setting 155 ° C./2 hours to -40 ° C./2 hours as one cycle. As a result, no cracks were found in any of the bifarer coils.

Apart from this, under the same curing conditions as above, N
A resin plate was produced using V-5502. The resin plate was machined to give a test piece A of 8 mm square and 15 mm long, and a width of 4 mm.
A test piece B having a size of mm × thickness 1 mm × length 35 mm was prepared. Using a thermophysical tester TMA-3000 manufactured by Vacuum Riko Co., Ltd., the glass transition temperature (Tg) and the linear expansion coefficient (α) of Tg or less of the test piece A were used, and a rheological viscoelasticity measuring device DVE-V4 was used. Then, the tensile elastic modulus of the test piece B at room temperature was obtained.

The resin cured product of this example has a Tg of 115 ° C.,
α was 6.9 × 10 ⁵ / ° C., and the tensile elastic modulus at room temperature was 345 kg / mm ² .

Example 10 An unsaturated polyester varnish (WP-435H manufactured by Hitachi Chemical Co., Ltd.) was used as an insulating varnish for dipping and impregnating a bifilar coil.
A bifilar coil was prepared in the same manner as in Example 9 except that the composition was cured at 20 ° C. for 3 hours.
The tensile modulus at g, α and room temperature was measured. The result of the heat cycle test was good, Tg was 66 ° C, α was 5.8 × 10 to ⁵ / ° C, and the tensile elastic modulus at room temperature was 105 kg.
/ Mm ² .

[Comparative Example 2] A bifilar coil was produced in the same manner as in Example 9 except that an acid anhydride-cured epoxy varnish was used as an insulating varnish for dipping and impregnating the bifilar coil and curing was performed at 150 ° C for 1 hour. The heat cycle test, Tg, α and the tensile modulus at room temperature were measured.

As a result, in the heat cycle test, cracks occurred in two of the five bifilar coils at the fifth cycle. The Tg of the resin cured product of this example is 1
At 25 ° C., α was 7.2 × 10 ⁵ / ° C., and the tensile elastic modulus at room temperature was 370 kg / mm ² .

[Comparative Example 3] PET was used as the insulating sheet.
In the same manner as in Example 1 except that the film and the ester-imide wire were used for the winding, a 3.7 kw 4p rotary electric device in which the housing holding the stator was made of cast iron was manufactured, and the weight and volume were Was measured. This was compared with Example 11 described later.

[Embodiment 11] Embodiment 1 except that the housing holding the stator is made of aluminum alloy die casting.
A 3.7kw 4p rotary electric machine similar to the above was manufactured.

The housing made of aluminum alloy die casting is
Compared to conventional cast iron housings, it has a higher thermal conductivity, and it is a highly efficient product that eliminates extra parts while maintaining strength based on the design using CAE (Computer Aided Engineering). By incorporating the advanced housing, a rotary electric device was manufactured.

The weight and volume were measured and compared with Comparative Example 3.

When the weight and volume of Comparative Example 4 were 100, respectively, the weight and volume of this example were 70 and 90, respectively, which were significantly reduced.

[Embodiment 12] A 3.7 kw, 4 p rotary electric device similar to that of Embodiment 11 was produced, except that the housing holding the stator was made of aluminum alloy die casting. When the weight and volume of Comparative Example 4 were 100, the weight and volume of this example were 71 and 89, respectively.

In summary of each of the above-mentioned Examples, in Examples 1 and 3, the characteristics of the insulating sheet were remarkably improved as shown in the characteristic chart. Further, in Example 2, since the aromatic polyamide nonwoven fabric is attached to one surface of the PEN film, the heat resistance characteristics are improved as compared with the PEN film of Comparative Example 1 alone.

In addition, 2 according to the Arrhenius plot of FIG.
At a heat resistant temperature equivalent to 10,000 hours, it is about 25
An improvement of ℃ or more is observed, which satisfies the F-type insulation.

From Examples 4 and 5, by sticking a PPS film of about 25 μm on both sides of the PET film, diffusion of oxygen into the interior of the sheet during thermal deterioration can be suppressed and heat resistance can be improved.

The slot insulator made of the PEN single film used in Comparative Example 1 is easily affected by the organic solvent such as styrene contained in the insulating varnish, water, or the like. Is reduced in a short time, and cracks easily occur even when bent, which is a problem in practical use.

Regarding the thermal stress generated in the winding end portion and the like, as is clear from the results of the heat cycle tests of Examples 8 and 9, the cured product of the impregnated insulating varnish was Tg.
Is 120 ° C. or less, the linear expansion coefficient α is 7.0 × 10 ⁵ / ° C. or less, and the tensile elastic modulus at room temperature is 100 to 350 kg / m 2.
Thermal stress can be reduced by using an insulating varnish that gives m ² .

The mechanical insertability of the rotary electric device into the slot was equal to or higher than that when the PET single film was used in all the insulating sheets of this example.

Further, a rotary electric device in which a housing made of an aluminum alloy die casting and the F type insulating material of the present invention are combined,
Comparing the volume and weight of the rotary electric device in which the casting housing and the F-type insulating material of the present invention are combined, the rotary electric device using the aluminum alloy die-cast housing is compared to that of the cast housing. It is possible to reduce the volume ratio by about 10% and the weight ratio by about 30%.

[0075]

EFFECT OF THE INVENTION The insulating sheet constituting the slot insulator is excellent in heat resistance and has a good mechanical insertion property into a slot like a PET single film, and a self-lubricating enamel wire has an enamel film on a slot portion or a coil end portion. Is less damaged. Further, since the insulating varnish has good compatibility with the insulating sheet and the enamel wire, it is possible to provide a rotary electric device satisfying the heat resistance as the F-type insulation.

Furthermore, by combining with a housing made of aluminum alloy die casting, it is possible to provide a small and lightweight rotary electric device.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a slot of a rotary electric device according to the present invention.

FIG. 2 is a cross-sectional view showing an example of an insulating sheet of the present invention.

FIG. 3 is a cross-sectional view showing an example of an insulating sheet of the present invention.

FIG. 4 is a characteristic diagram of an insulating sheet.

FIG. 5 is a characteristic diagram of an insulating sheet.

FIG. 6 is a characteristic diagram of an Arrhenius plot of an insulating sheet.

[Explanation of symbols]

1 ... iron core, 2 ... slot, 3 ... slot insulator, 4 ... winding, 5 ... insulating wedge, 6 ... stator, 10 ... insulating varnish, 11, 18 ... insulating sheet, 12 ... PEN film,
13 ... Aromatic polyamide nonwoven fabric, 19 ... PET film, 20 ... PPS film.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Akihiro Sekine 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Industrial Equipment Division, Hitachi, Ltd. (72) Inventor Go Omata 7-1, 1 Higashi Narashino, Narashino City, Chiba Prefecture No. Hitachi Industrial Co., Ltd. Industrial Equipment Division (72) Inventor Shuichi Ohara 7-1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory

Claims (6)

[Claims] 1. A rotary electric device having a housing for holding a stator and a rotor, wherein a winding portion is constituted by a self-lubricating enamel wire, and insulation between the ground portion and the phase of the winding portion is polyethylene-2,6. -An insulating sheet obtained by laminating a naphthalate film and an aromatic polyamide non-woven fabric, or an insulating sheet obtained by laminating a polyphenylene sulfide film on both sides of a polyethylene terephthalate film, impregnated with the winding portion and the insulating sheet, A rotating electric device, characterized in that it is held by a cured cured insulating varnish. 2. An insulating sheet obtained by laminating the polyethylene-2,6-naphthalate film and an aromatic polyamide non-woven fabric has a thickness of 0.05 to 0.35 mm and the polyethylene-2,6-na The rotary electric device according to claim 1, wherein the phthalate film is an insulating sheet having a film thickness of 64-82% of the total thickness. 3. An insulating sheet in which a polyphenylene sulfide film is laminated on both sides of the polyethylene terephthalate film has a thickness of 0.05 to 0.35 mm, and both sides of the polyphenylene sulfide film have a total thickness. The rotary electric device according to claim 1, which is an insulating sheet having a thickness of 20 to 45%. 4. The rotary electric device according to claim 1, wherein the cured product of the insulating varnish is a cured product of an unsaturated polyester resin or an unsaturated epoxy ester resin. 5. The cured product of the insulating varnish has a glass transition temperature of 120 ° C. or lower and a linear expansion coefficient of 7.0 × 10 ⁵ / ° C. or lower,
Moreover, the initial elastic modulus at room temperature is 100 to 350 kg /
The rotary electric device according to claim 1, wherein the rotary electric device has a size of mm ² . 6. The rotary electric device according to claim 1, wherein the housing holding the stator is an aluminum alloy die casting.