JPS5963958A - Insulating method for coil of electric apparatus - Google Patents

Abstract

PURPOSE:To suppress the deterioration in the characteristic of change in quality due to chemical action by immersing a coil with water soluble insulating varnish, and drying it under specific conditions. CONSTITUTION:Polyester film is used for a ground insulator 1, an interphase insulator 2 and an insulating wedge 3, and an ester imide wire, polyester amideimide wire or seized polyester wire is used for the coil, i.e., a magnetic wire 4. Water soluble varnish 5 is dipped and immersed with the wire, dried at 140- 150 deg.C, and when the varnish to be dried reaches the temperature, it is dried for 2.5-5.0hr.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for insulating electrical equipment windings when manufacturing electrical equipment windings.

[Technical background of the invention]

Conventionally, polyimide film or aramid paper has been used as an insulating material in combination with a water-soluble insulating film containing solvent components such as water, butyl cellosolve, and trimethylethanolamine. As the condition deteriorates, there are problems such as the workability of mechanical insertion work worsens.Therefore, we use polyester film (for example, "Lumirror", a new product name of Toshima) or heat-resistant polyester 2 (chill film (for example, "Lumirror X-10") ``f'': If used alone, the above problems are generally solved, but the following problems arise.

Polyester film or heat-resistant column? Combining the Lyester film alone with the above-mentioned water-soluble insulating film,
In addition, when this face is heat-dried at a drying temperature of 150° C. or more and a drying time of 4 hours or more, the mechanical strength is significantly reduced as shown in the experimental data shown in FIG. 1, which poses a practical problem.

Furthermore, when polyester wires commonly used as winding wires are combined with water-soluble insulating varnish, the polyester enamel coating chemically changes in quality when heated and dried.
As shown in the figure, dielectric breakdown may also pose a practical problem due to pressure.

[Purpose of the invention]

An object of the present invention is to suppress the deterioration of properties due to chemical effects and to make it inexpensive without impeding productivity.

[Summary of the invention]

The present invention is based on a water-soluble insulating varnish, a polyester film, an ester imide wire, a polyester amide-imide wire, or a Saic type wire. Liester wire (e.g. l5O
NEL-200 Schenectaday Chemical product name)
and using the above water-soluble insulating varnish in combination with 14
It is characterized by drying treatment at 00 to 150°C for 2.5 to 5.0 hours under optimal conditions.

[Embodiments of the invention]

FIG. 3 shows I of an embodiment in which the present invention is applied to a rotating machine winding.
I, no example provided. Ground insulator 1, interphase insulator 2
, and for the insulating wedge 3, use esterimide wire, polyesteramideimide wire, or saic type polyester wire for the magnet wire 4, and apply water-soluble insulating varnish to the wire. , 5 was immersed and impregnated, and then dried at a drying temperature of 140 to 1
The object to be treated is heated to this temperature at 50° C. and subjected to drying treatment for 2.5 to 5.0 hours.

The winding insulation obtained by such an insulation structure and drying process is chemically affected by the individual or synergistic action of water, butylcellosolve, and dimethylethanolamine contained in the above-mentioned water-soluble insulating varnish, as well as by the combination of these and temperature and time. However, in the present invention, this deterioration of properties due to chemical effects is maintained to the extent that it does not pose a problem in practice, and finally functions necessary for an insulating varnish, such as fixing the winding, insulating the winding, and reinforcing the winding, etc. It is necessary to emit rW so that the above-mentioned moisture does not have a harmful effect on the winding insulation.

A trial product was obtained by impregnating the water-soluble insulating varnish with the above-mentioned example 411 and then drying and curing it at an appropriate combination of drying temperature and drying time. Figure 4 shows the results of examining the change in strength under the drying conditions described above. Figure 5 shows the relationship between drying temperature and drying time to make the moisture content the same as that expected. ) When the drying temperature is 139° C. or lower, the deterioration of the properties of the sheet material, etc. is suppressed to 50 degrees or less of the initial strength, but it takes a long time to volatilize the solvent. Furthermore, if the drying temperature is set to 151° C. or higher, the properties of the sheet material will deteriorate to 50° C. or higher, which is the initial strength, which poses a practical problem. From these points of view, when combining a structure consisting of a polyester film as an insulating material, an ester imide wire, a polyester amide imide wire, or a saic type polyester wire with a water-soluble insulating varnish, it is necessary to find the appropriate conditions for drying this varnish. If it is not obtained, the insulating material will be chemically deteriorated or productivity will be hindered, making it impractical.

Therefore, in order to satisfy each characteristic and practicality in combination with the water-soluble insulating varnish and the drying conditions according to the above configuration example, the drying conditions should be set at a drying temperature of 140 to 150°C for the interaction of the three above. It is optimal to select and reach the temperature within this temperature range for 2.5 to 5.0 hours.

〔Effect of the invention〕

The present invention features an insulating structure consisting of a polyester film, an esterimide wire, etc. used in combination with a water-soluble insulating varnish containing water, butyl cellosolve, dimethylethanolamine, etc. as a solvent component, and a temperature of 140°C as a condition for drying the above-mentioned phenol. This is a method for insulating windings of electrical equipment under the optimum conditions of ~150°C for 2.5 to 5.0 hours, and according to the present invention, the following results can be obtained.

(1) 7+? The insulating structure consisting of polyester film, ester imide wire, polyester amide imide wire or Saic Taigu polyester wire is dried under appropriate drying conditions such as water contained in water-soluble insulating phenol, butyl cellosolve, and solvent components such as trimethylethanolamine. Under these conditions, deterioration of properties due to chemical effects can be suppressed, and performance that can be used in practical use can be obtained.

(2) The workability of the non-conventional ground insulators, interphase insulators, and insulating wedges, etc. when they are processed and assembled as a component does not pose any problems in mechanical work, etc.; The same applies to lines. Furthermore, the phenol drying process is not particularly special in terms of equipment or workability, and there are no problems in these respects.

(3) Extremely inexpensive and highly practical.

Therefore, according to the present invention, a highly reliable φ leprosy electric wire (4-wire spring wire) which is optimal for use in combination with an inexpensive and practical water-soluble insulating phenol that prevents the deterioration of properties of t[ due to chemical action. The insulation treatment method can be proposed.

[Brief explanation of drawings]

Figure 851 shows the strength change characteristics when dried at 155°C due to the combination of water-soluble insulating phenol and sheet material.The second figure shows the strength change characteristics when drying at 155℃ due to the combination of water-soluble insulating phenol and sheet material.
3 is a cross-sectional view of a slot in an embodiment of the present invention, and FIG. 4 is a characteristic diagram of breakdown voltage change during drying at °C. FIG. After that, the ground insulator was removed and the characteristics diagram showing the drying conditions and strength change characteristics of this material. FIG. 3 is a characteristic diagram showing the relationship between drying time and drying time. DESCRIPTION OF SYMBOLS 1... Earth insulator, 2... Interphase insulator, 3... Insulating wedge, 4... Magnet wire (winding), 5... Water-soluble insulating phenol. Applicant's agent Patent attorney Takehiko Suzue 1st r:!
J Whistle 3 Figure 96 t, Figure 5v! I - orbityt; ii degrees (・C)

Claims (1)

[Claims] A polyester film is used as the film-like insulator of the winding part, and esterimide UA, yl is used as the winding material.
? A winding is constructed using a polyester amide-imide wire or a saic type polyester wire, which is impregnated with a water-soluble insulating face and dried.The drying conditions for this water-soluble P green varnish are at a temperature of 140°C to 150°C. A method for insulating windings of electrical equipment, characterized in that the optimum condition is 2.5 to 5.0 hours at ℃.