JP2979887B2 - Electric device coil, electric device having coil, and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device coil comprising a conductor and an interlayer insulation interposed therebetween, an electric device having the coil, and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a method of cooling a coil of an electric device, in a cooling method of directly contacting a conductor and a coolant, a coil is formed without using an insulating layer between the conductor and the coolant in order to increase cooling efficiency. Is required. Conventionally, as interlayer insulation for such a coil, a method of inserting a sheet-like insulation between conductors to form a coil has been adopted. It is common to use saddle-shaped coils in electrical equipment, particularly in generators, electric motors, particle accelerators and the like.

[0003] In a saddle-shaped coil, the coil arc between the straight coil portion and the straight coil portion has a circular or elliptical shape in the center line of the coil, but the locus of the edge of the coil is a simple circle or ellipse. It is very complicated to describe an exact shape, not a shape. In addition, since the shape of the coil arc portion is different depending on the height position in the coil stacking direction, it is necessary to manufacture the shape corresponding to the height one by one. In actual production of interlayer insulation, the interlayer insulation at each height is cut in a circular or elliptical shape in accordance with the shape.

However, in a device requiring a precise shape, in particular, in a saddle coil such as a particle accelerator using a superconducting conductor, point sequence data is input to an NC device as a method of producing interlayer insulation, and an interlayer insulation material is formed. We are cutting. In such an interlayer insulation manufacturing method using an NC machine, enormous cost and time are required for forming a saddle coil having hundreds of turns, and sometimes thousands of turns.

[0005]

That is, among the saddle-shaped coils, the circular arc portion 8 between the linear portions 6 of the coils shown in FIGS . 6 and 7 has a circular shape. without But, complex shapes and ing nor oval. In order to manufacture the interlayer insulating 3A the arcuate portion 8 performs marking by using an NC device in the insulating sheet 9, it had to be used a method of cutting. For a coil having a large number of turns, fabricating interlayer insulation using such NC equipment has resulted in enormous fabrication costs and a great deal of time for fabrication.

On the other hand, in the interlayer insulation 3 manufactured by cutting out the insulating sheet 9, if it is inserted between conductors, a slip or slippage occurs between the conductors, not only deteriorating the insulation performance but also causing an interlayer short-circuit phenomenon in the coil. In the event that a failure occurs, the coil may be blown and a large accident may occur. In addition, as this kind of technology, Japanese Patent Application Laid-Open No. 4-56548 and Japanese Utility Model Application Laid-Open No. 3-23812 can be cited.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable electric device coil in which the time required to manufacture the coil is greatly reduced and the electric insulation performance is improved, and a method of manufacturing the same.

[0008]

Means for Solving the Problems] electrical equipment coil according to the present invention, the cross-sectional surface is one having an interlayer insulation which is formed by crushing flat the tubular insulating member of the circular, side end surface of each interlayer insulation is It has a protruding portion formed so as to protrude in the lamination direction of the conductor. Inside the tube type insulation member
It is inserted into the insulation film. The electric device coil according to the present invention configured as described above is manufactured as follows .
That is, the interlayer insulation in which prepreg resin is applied to the tube-shaped insulating member having flexibility is inserted between the conductors, and a plurality of conductors are laminated while pressing the interlayer insulation, and the side end surfaces of the interlayer insulation protrude in the conductor lamination direction. A coil is formed, and the coil is heated to cure the prepreg resin applied to the interlayer insulation. Further, the electric device coil according to the present invention thus configured is used as a rotating electric machine such as a generator or a motor, or as an electric device coil mounted on an iron core such as a particle accelerator or a superconducting device.

[0009]

According to the electric device coil of the present invention, the interlayer insulation pressed between the stacked conductors is a tube-shaped insulating member having flexibility and elasticity, so that the arc portion of the coil is complicated. The interlayer insulation is also deformed according to the shape of the coil, and it is not necessary to manufacture insulating sheets one by one according to the shape of the coil as in the related art. Further, an interlayer insulating arranged by being pressed between the laminated conductor, so as to cover a part of the inner peripheral edge and the outer peripheral edge of the conductor protruding in the stacking direction of the conductor
Since it is provided with the protruding portion formed as described above, displacement and slippage between the coil layers can be prevented. Further, the creepage distance of the coil can be increased.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

The rotor 10 used in the generator of FIG.
The rotor core 12 is fixed to the rotating shaft 11, and the rotor core 12
A tooth 13 and a wedge 14 are formed on the outer periphery of the device, and a saddle-shaped field coil 1 is mounted on them. One end of the field coil 1 is pressed and supported by a retaining ring 15.

As shown in FIG. 1, a saddle-shaped coil 1 which is the same as a field coil 1 (hereinafter referred to as a coil) is used in a rotor coil such as a generator and a motor, a particle accelerator, and the like. In order to further improve the cooling characteristics, a cooling system is employed in which the refrigerant directly contacts the coil conductor.
In such a system, directly wrapping the insulation around the conductor 2 is not used because the cooling performance is reduced, and the structure is such that only the interlayer insulation 3 is placed between the conductors.

In the present invention, as shown in FIG. 1, when the conductor 2 is wound at the time of forming the coil, the interlayer insulation 3 is formed by flattening a tube-shaped insulating member 4 having a circular cross section. Epoxy prepreg resin is applied to the interlayer insulation 3. The interlayer insulation 3 coated with the resin is inserted between the conductors 2 and wound while being wound to form the saddle-shaped coil 1. Then, the conductor 2 laminated as shown in FIG.
And a coil 1 having a flexible interlayer insulation 3 pressed between these conductors and a protrusion 5 formed by projecting a side end face of each interlayer insulation in the conductor lamination direction. The coil 1 is placed in a heating device to cure the resin, and the conductor 2 is fixed to the interlayer insulation 3.

If a tube-type insulating member made of glass fiber is used as the tube-type insulating member 4, it is possible to wind a flexible, stretchable and complicated shape without gaps. As this interlayer insulation 3, a tape-shaped flexible material may be used. The width of the tube-type interlayer insulation 3 is formed wider than the width of the conductor 2. When the tube-type interlayer insulation 3 is wound while being wound while being inserted between the conductors 2, the winding force acts as a pressing force for pressing the interlayer insulation 3 with the conductor, and the coil cross section after the coil is formed is shown in FIG. As described above, a portion of the inner peripheral side and the outer peripheral side of the interlayer insulation 3 is formed as the protruding portion 5 protruding in the conductor laminating direction, and an effect of preventing the interlayer insulation 3 from shifting and slipping is produced.

On the other hand, if the interlayer insulation 3 shifts or slips in the coil 1, the possibility of occurrence of a so-called rare short circuit increases. When a rare short occurs, the ratio of the shorted turn to the total number of other turns is
Since a large amount of current flows due to the transformer effect, and particularly in a superconducting device having a large number of windings and a large amount of flowing current, fusing of the coil is inevitable and a large accident occurs.
Can be prevented.

As described above, according to the present invention, the following effects can be achieved.

1) Since the interlayer insulating member 3 of a tube type insulating member having flexibility and elasticity is used, the interlayer insulating member 3 is deformed according to the complicated shape of the arc portion 7 of the coil 1, so that it is different from the conventional interlayer insulating member. The work time can be greatly reduced compared to the case where individual sheets are manufactured according to the shape of the coil from the insulating sheet.

2) The protruding portion 5 projects so as to cover a part of the inner peripheral side and the outer peripheral side of the conductor 2, so that the coil 1 is not easily displaced and slipped, and the creepage distance between the coil layers is reduced. It is possible to increase the possibility of rare shorts.

Further, the protrusion 5 increases the creepage distance at the conductor edge, makes it possible to reduce the thickness of interlayer insulation at the conductor portion, and makes it possible to increase the number of winding turns for a predetermined size. . In particular, when the interlayer insulation 3 of the tube-type insulation member is used, the shape of the protruding portion 5 becomes an arc shape, and the electric field concentration does not occur.

Further, as the coil, a coil having a small variation with respect to an electromagnetic force or other mechanical force (such as a centrifugal force in the rotor), that is, a coil having a high Young's modulus is desired.
Particularly, in a coil using superconductivity, a quench phenomenon occurs due to a slip of the coil or the like. Therefore, it is important to prevent the coil from moving.

When glass fiber is used as the tube-type interlayer insulating material, it is easy to impregnate the fiber with a resin such as epoxy. After impregnating the epoxy and curing the epoxy at a predetermined temperature after forming the coil,
Further, in addition to the coil having no conductor slippage or slippage, when the coil is pressed in the laminating direction during curing, the conductor and the interlayer insulation are further adhered to each other, so that a strong coil having a high Young's modulus can be formed.

3) As described above, when a resin such as epoxy is cured by heating, the entire winding is placed in a constant temperature room, or a heater is arranged in the winding to control the temperature.

However, if the metal bobbin holding the coil is large, it is difficult to put the entire coil in a constant temperature chamber, and even if an attempt is made to raise the temperature by using a heater or a hot air blower, the heat is easily taken by the bobbin. The temperature cannot be raised. Therefore, when the above resin-impregnated tube interlayer insulation is cured by heating, it is effective to apply a current to the conductor itself to promote a temperature rise. That is, it is possible to easily and uniformly apply a temperature rise to the interlayer insulating portion by applying a current, and even if the coil is large, it does not cause a major problem in equipment as in the constant temperature room equipment.

In order to further improve the dielectric strength as the interlayer insulation, it is desired to use a material having a large dielectric strength such as polyimide as the interlayer insulation. In the tube-type interlayer insulation used in the present invention, when the polyimide film 10 is inserted into the glass tube interior 2 as shown in FIG. 4, there is a projection (twisted conductor) particularly in the shape of the conductor. When insulation is pressed, the film 10
This can prevent the interlayer insulation from being damaged.

As a method for inserting a film, a tube with a film as shown in FIG. 5 is also possible by winding the film in advance on a fiber winding rod 11 serving as a core when the tube is manufactured. is there. By using such interlayer insulation, the insulation thickness can be further reduced, and a coil having the same size and a larger number of turns can be manufactured.

[0026]

According to the electric device coil of the present invention,
An interlayer insulating arranged by being pressed between the laminated conductor,
Because it is a flexible and elastic tube-type insulating member,
Interlayer insulation is also deformed according to the complicated shape of the circular arc part of the coil, so there is no need to manufacture insulating sheets one by one according to the coil shape as in the past, greatly reducing the work time . Further, according to the electric device coil of the present invention, the interlayer insulation pressed and arranged between the stacked conductors covers the inner peripheral side and the outer peripheral side of the conductor so as to partially cover the inner peripheral side and the outer peripheral side. Equipped with a protrusion that protrudes in the stacking direction
It can prevent slippage and slippage between coil layers,
The electrical insulation performance can be improved. Also, since the creepage distance of the coil can be increased and the withstand voltage performance of the coil can be improved,
The electric equipment can be reduced in size accordingly.

[Brief description of the drawings]

FIG. 1 is a perspective view of a coil used in the rotor of FIG.

FIG. 2 is a cross-sectional side view of the rotor of FIG. 3;

FIG. 3 is a perspective view of a rotor of the rotary electric machine according to the embodiment of the present invention.

FIG. 4 is a perspective view of a tube-type interlayer insulation according to another embodiment of the present invention.

FIG. 5 is a perspective view of a tube-type interlayer insulation showing another embodiment of the present invention.

FIG. 6 is a perspective view showing the vicinity of an arc portion of a conventional saddle coil.

FIG. 7 is a plan view of an insulating sheet used in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Saddle type coil, 2 ... Conductor, 3 ... Interlayer insulation, 4 ... Tube type interlayer insulation, 5 ... Projection.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-274633 (JP, A) JP-A-59-185133 (JP, A) JP-A-57-59444 (JP, A) 25249 (JP, U) Japanese Utility Model 3-94052 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02K 3/00-3/52 H01F 27/28

Claims (4)

(57) [Claims] 1. A laminated conductor and an interlayer insulation formed by flattening and crushing a tube-shaped insulating member having a circular cross section, which is arranged to be pressed between the conductors. An electric device coil comprising: a side end surface of interlayer insulation having a protrusion formed so as to protrude in a lamination direction of the conductor. 2. The electric device coil according to claim 1, wherein an insulating film is inserted inside the tube type insulating member. 3. An interlayer insulation obtained by applying prepreg resin to a flexible tubular insulating member is inserted between conductors, and a plurality of conductors are laminated while pressing the interlayer insulation. A method for manufacturing a coil of an electric device, comprising: forming a coil projecting in a direction, heating the coil, and curing a prepreg resin applied to interlayer insulation. 4. A tube having an iron core and an electric device coil mounted on the iron core, wherein the electric device coil is disposed between the conductors by being pressed between the conductors and has a circular cross section. It has interlayer insulation formed by crushing the mold insulating member flat, and has a protruding portion formed by protruding a side end face of each interlayer insulation in the lamination direction of the conductor. Electrical equipment.