JPH0870545A - Fixation of field coil of rotary electric machine - Google Patents

Abstract

PURPOSE: To provide a method for fixing a field coil by which a field coil can be tightly fixed to a field core and therefore the field coil does not move even if it is subject to shock or vibration for a long time due to acceleration and deceleration and changes in direction of rotation. CONSTITUTION: In a rotary electric machine, the insulating resin is impregnated in all spaces between a field coil 2 and thermal expanding porous insulating blocks 5, between a field iron core and the thermal expanding porous insulating blocks 5, and between the thermal expanding porous insulating blocks 5, and then the insulating resin is heated and hardened to integrate the field iron core 1 and the field coil 2 into one body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and more particularly to a method for fixing a field coil.

[0002]

2. Description of the Related Art A conventional method for fixing a field coil will be described below with reference to FIG. For example, a field coil 2 wound around a field iron core 1 of a rotor such as a synchronous motor is
During operation, especially when a large current flows at the time of starting and accelerating / decelerating, it receives a large electromagnetic force and vibrates. Further, it vibrates in the circumferential direction by the inertial force and in the radial direction by the centrifugal force.

This is the field iron core 1 and the field coil 2 of the rotor.
This may cause damage to the insulation due to friction between them, cutting of lead wires, etc. For this reason, various methods such as a blocking method and a support method have heretofore been known as methods for preventing the vibration of the field coil 2 of the rotor.

For example, the most commonly used conventional block method is to wind a field coil 2 around a field iron core 1 as shown in FIG. It is a method in which a plurality of laminated plates 3 made of an insulating resin and glass fibers are overlapped and inserted between and fixed.

[0005]

However, in these methods, generally, the gap between the field core 1 and the field coil 2 is not always uniform, and the thickness, the number and the length of the laminated plates are adjusted for each inserting position. The magnetic field core 1 and the field coil 2 must be firmly inserted over the entire gap.

Therefore, the field coil 2 and the laminated plate 3 do not have an ideal overall surface contact, but a point contact or a non-contact part is partially generated, and a slight gap remains. Long-term operation in this state
Laminated plate 3 due to repeated heating and cooling when stopped and vibration
Is partially struck by the field iron core 1 or the field coil 2, or is also struck between the laminated plates 3 that are stacked one on top of another, causing mechanical damage and deterioration of insulation, and the intended purpose cannot be achieved. There was a flaw.

When the gap between the field core 1 and the field coil 2 is filled with the insulating resin, the contact surface between the field coil 2 and the insulating collar 4 and the field core head side iron core surface 1a are insulated. Since the contact surface of the collar 4 has fine irregularities, the insulating resin flows out from between the contact surfaces, and the contact surfaces are bonded by the insulating resin. Due to the difference in the coefficient of thermal expansion between the coil 2 and the insulating collar 4, the larger the field coil becomes, the greater the influence of the difference in thermal expansion becomes. There is a risk that the insulating material will break or the insulating collar 4 will crack.

Therefore, the present invention has been made in view of the above points, and the field coil is firmly fixed to the field iron core, and the shock and vibration due to the acceleration / deceleration operation and the normal / reverse rotation operation are performed for a long period of time. It is an object of the present invention to provide a method for fixing a field coil of a rotating electric machine, which does not cause harmful movement of the field coil even when receiving the above.

[0009]

In order to achieve the above object, the invention according to claim 1 heats an insulating resin impregnated in an insulating base material inserted between a field core and a field coil of a rotating electric machine. Insert a plate-shaped heat-expandable porous insulating block formed of a material that expands in the thickness direction by, and then impregnate the insulating resin and heat-cure it to separate the field core and the field coil. It is designed to be fixed integrally.

The invention according to claim 2 is a plate-shaped member formed of a material which is impregnated with an insulating resin in an insulating base material inserted between the field iron core and the field coil and expands in the thickness direction by heating. The heat-expandable porous insulating block is impregnated with the insulating resin and then inserted, and then heat-cured to integrally fix the field core and the field coil.

Further, according to the invention as defined in claim 3, the field coils are hardened and bonded at room temperature between the contact surfaces of the field coil and the insulating collar and between the contact surfaces of the field core head side iron core and the insulating collar, and the field magnet is formed. Inserted between the field core and the field coil by bonding with an adhesive that has a temperature characteristic that loses adhesive strength at a temperature lower than the curing temperature of the insulating resin impregnated in the insulating base material inserted between the core and the field coil. The insulating base material is impregnated with the insulating resin and is impregnated with the insulating resin in the plate-shaped heat-expandable porous insulating block made of a material that expands in the thickness direction by heating, and then inserted and then heat-cured. The field core and the field coil are integrally fixed.

According to a fourth aspect of the present invention, the field coils are hardened and bonded at room temperature between the contact surfaces of the field coil and the insulating collar and between the contact surfaces of the field core head side iron core and the insulating collar. Bonded with an adhesive having a temperature characteristic that loses adhesive strength at a temperature lower than the curing temperature of the insulating resin impregnated in the insulating base material inserted between the magnetic core and the field coil. Insert a plate-like heat-expandable porous insulation block made of a material that is impregnated with insulating resin into the coil and expands in the thickness direction by heating, then impregnate the insulating resin and heat cure Then, the field core and the field coil are integrally fixed.

[0013]

The field coil fixing method of the present invention constructed as above operates as follows. The field coil fixing method according to claim 1, wherein the thermally expandable porous insulating block inserted in the gap between the field iron core and the field coil is inside the thermally expandable porous insulating block when impregnated with an insulating resin. The insulating resin is absorbed in and the heat-expandable porous insulating block expands in the thickness direction by heat when it is hardened by heating, so that the gap between the field iron core and the field coil is filled and hardened to fix it.

A method of fixing a field coil according to a second aspect is
The heat-expandable porous insulating block that has absorbed the insulating resin expands in the thickness direction by the heat when it is hardened by heating, so that the gap between the field core and the field coil is filled and hardened to fix it.

In the field coil fixing method according to the third and fourth aspects, the room temperature is maintained between the contact surface between the field coil and the insulating collar and between the contact surface between the field core head side iron core surface and the insulating collar. In order to prevent the impregnated insulating resin from flowing out, the insulating resin is prevented from entering between the contact surfaces.

In this state, the heat-expandable porous insulating block in which the insulating resin is absorbed expands in the thickness direction due to the heat at the time of heating and hardening, thereby filling and hardening the gap between the field core and the field coil. To fix by.

On the other hand, the adhesive applied between the contact surfaces of the field coil and the insulating collar and between the contact surfaces of the field core head side iron core and the insulating collar is decomposed and bonded at a temperature for curing the insulating resin. Loss of force, and does not restrain against heat expansion during heating / cooling during operation / stop between the contact surface between the field coil and the insulating collar, and between the contact surface between the field core head side iron core surface and the insulating collar. Become.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a field iron core and a field coil of a rotary electric machine manufactured by the method of this embodiment, FIG. 2 is an enlarged view of part A of FIG. 1, and FIG. FIG.

As shown in FIGS. 1 and 2, the field coil 2 is wound around the field core 1 and the gap between the field core 1 and the field coil 2 is heated to increase the thickness direction. Plate-shaped heat-expandable porous insulating block 5 (for example, ISOVOLTA PO
ROMAT 2242) is inserted more than once.

An insulating collar 4 is arranged between the field coil 1 and the iron core surface 1a on the head side of the field iron core. Furthermore, in the embodiment corresponding to claim 1, FIG.
As shown in FIG. 5, insulating resin is provided in all gaps between the field coil 2 and the thermally expandable porous insulating block 5, between the field core 1 and the thermally expandable porous insulating block 5, and between the thermally expandable porous insulating blocks 5. 6 is impregnated and heat-cured to integrate the field coil 2 and the field core 1.

In the embodiment corresponding to claim 2, the thermally expansive porous insulating block 5 impregnated with the insulating resin 6 is inserted, and as shown in FIGS. 2 and 3, the field coil 2 and the thermal expansion. The insulating resin 6 is filled in all gaps between the porous porous insulating blocks 5, between the field iron core 1 and the thermally expansive porous insulating blocks 5, and between the thermally expansive porous insulating blocks 5, and heat-cured to heat the magnetic field. The coil 2 and the field iron core 1 are integrated.

In the embodiments corresponding to claims 3 and 4, a contact surface between the field coil 2 and the insulating collar 4 and a contact surface between the field core head side iron core surface 1a and the insulating collar 4 are provided. Prevent the insulating resin 6 from entering between the contact surfaces by bonding with an adhesive 7 (for example, Power Ace GEL manufactured by Sekisui Chemical Co., Ltd.) that has a property of adhering at room temperature and losing adhesiveness at the curing temperature of the insulating resin 6. , The thermally expansive porous insulating block 5 is inserted into the gap between the field iron core 1 and the field coil 2, and the insulating resin 6
Is impregnated or filled, and heat-cured to integrate the field coil 2 and the field iron core 1.

As described above, according to the above-mentioned embodiment, the plate-like thermally expandable porous insulating block 5 whose thickness direction increases by heat is inserted between the field core 1 and the field coil 2, The field coil 2 can be easily and integrally fixed to the field core 1 simply by heating and hardening the insulating resin 6 impregnated in the heat-expandable porous insulation block 5 in advance.

[0024]

As described above, according to the present invention, since the heat-expandable porous insulating block may be thin in the gap between the field core and the field coil, it can be easily inserted.
The plate-like heat-expandable porous insulation block impregnated with insulating resin is inserted between the field core and the field coil in a relatively simple configuration, and the field core and field coil can be easily and firmly connected. Can be fixed to.

[Brief description of drawings]

FIG. 1 is an external view of a field iron core and a field coil of a rotary electric machine manufactured by a method according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion A in FIG.

FIG. 3 is a view on arrow B of FIG.

FIG. 4 is a cross-sectional view of a field iron core and a field coil of a rotary electric machine manufactured by a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Field iron core, 1a ... Field iron core head side iron core surface, 2 ... Field coil, 3 ... Laminated plate, 4 ... Insulating collar, 5 ... Thermally expandable porous insulating block, 6 ... Insulating resin, 7 ... adhesive.

Claims (4)

[Claims] 1. A plate-like heat-expandable porous insulation made of a material which is impregnated with an insulating resin in an insulating base material inserted between a field iron core and a field coil of a rotary electric machine and expands in a thickness direction by heating. A method for fixing a field coil of a rotary electric machine, comprising: inserting a block, impregnating the insulating resin, and then heat-curing to integrally fix the field core and the field coil. 2. A plate-like heat-expandable porous insulation made of a material which is impregnated with an insulating resin in an insulating base material inserted between a field iron core and a field coil of a rotating electric machine and expands in a thickness direction by heating. A method of fixing a field coil of a rotary electric machine, comprising impregnating a block with the insulating resin, inserting the block, and then heat-curing the block to integrally fix the field core and the field coil. 3. The field iron core and the field magnet of the rotating electric machine are hardened and adhered at room temperature between the contact surface of the field coil and the insulating collar and between the contact surface of the field iron core head side surface and the contact surface of the insulating collar. The insulating base material inserted between the coils was bonded with an adhesive having a temperature characteristic that loses its adhesive strength at a temperature lower than the curing temperature of the insulating resin impregnated, and was inserted between the field core and the field coil. The insulating resin is impregnated into the insulating base material, and the plate-like heat-expandable porous insulating block formed of a material that expands in the thickness direction by heating is impregnated with the insulating resin and then inserted and heat-cured to obtain the field magnet. A method for fixing a field coil of a rotary electric machine, comprising integrally fixing an iron core and the field coil. 4. The field iron core and the field magnet of the rotating electric machine are hardened and bonded at room temperature between the contact surface of the field coil and the insulating collar and between the contact surface of the field core head side iron core surface and the contact of the insulating collar. The insulating base material inserted between the coils was bonded with an adhesive having a temperature characteristic that loses its adhesive strength at a temperature lower than the curing temperature of the insulating resin impregnated, and was inserted between the field core and the field coil. The insulating core is impregnated with an insulating resin and a plate-like heat-expandable porous insulating block made of a material that expands in the thickness direction by heating is inserted, and then the insulating resin is impregnated and heat-cured to form the field core. And a field coil are integrally fixed to each other, and a field coil fixing method for a rotary electric machine.