JPH08167529A - Cooling method for coil of inductor, the coil of the inductor using the method, and transformer - Google Patents

Abstract

PURPOSE: To supply larger current in a compact structure and small size by forming a coil for an inductor by spirally winding a wire on the outer periphery of a hollow cylindrical member made of an insulator, and supplying cooling water to the hollow member. CONSTITUTION: A coil 1 for an inductor is formed by spirally winding a lead 3 covered with insulator such as enamel or Teflon, etc., on a hollow cylindrical member 5 made of insulator such as ceramics or plastic at a suitable pitch. In order to cool the coil 1 for the inductor, cooling water of suitable temperature and flow rate is reversely suppled from a cooling water supply port into the member 5 to cool the coil from the interior via the member 5, and the water raised at its temperature is drained from a drain port opposed to the supply port. Accordingly, the coil is cooled via the member, and hence a larger current can be supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling an inductor coil, which is an electric circuit component, and an inductor coil and a transformer using the cooling method.

[0002]

2. Description of the Related Art Conventionally, an air-core coil of an enameled wire having a wire diameter of 3 mm to 5 mm has been used as a coil for an inductor used in a power supply device for a laser oscillator of high frequency AC excitation. A cooling fan is used to suppress the temperature rise of the coil. However, the cooling capacity of the air-cooling system is not so large that it was difficult to use it with high power. Therefore, for the inductor coil used with high power, a method is used in which the inductor coil is manufactured with a tube of copper or the like, and cooling water is caused to flow in the tube to cool it.

Further, in the transformer used in the power supply device of the above-mentioned laser oscillator of high frequency AC excitation, a magnetic core is used to bring the coupling coefficient of electromagnetic coupling close to 1, and this magnetic core is used. Is often used as a toroidal core that has a large inductance with respect to the number of turns of the coil and has a strong magnetic flux confinement effect.

[0004]

The inductor coil used in the power supply of a high frequency AC excitation laser oscillator is required to withstand a large amount of power as the laser oscillator increases in output. However, as described above, the conventional air-core coil using the enameled wire has a problem that it cannot be used with a large electric power due to the limit of the cooling capacity.

Further, since the coil made of a tube for cooling the inductor coil by flowing cooling water in the tube has a higher cooling efficiency than the air cooling system, it is possible to flow electric power larger than that in the air cooling system. However, when the tube diameter is small and the tube length is long, there is a problem that the tube is easily clogged and the resistance of the water flow increases to prevent sufficient cooling water from flowing.

Further, in the case of a coil made of a tube, if the diameter of the coil is reduced, the cross-sectional shape of the tube is deformed to a flat shape, which makes it difficult for cooling water to flow. .

As is well known, transformers have copper loss due to winding resistance and iron loss in the magnetic core. These losses largely depend on the frequency of the current, and in the case of a magnetic core having a high magnetic permeability suitable for the magnetic core of a transformer, there is a problem that the loss rapidly increases at high frequencies. Also, one of the transformer
When the input on the secondary side is a rectangular wave obtained by a DC-DC converter, there is a problem that the iron loss further increases and the temperature rise rate of the transformer increases.

In the case of a transformer using a toroidal core, increasing the size of the toroidal core in order to increase the capacity is difficult to manufacture and the price is very expensive. As a countermeasure, a method of using a plurality of small-capacity transformers using a toroidal core in parallel is conceivable, but this also suffers from a large price of the power supply device and there is a problem in terms of cost.

As the cooling means for the toroidal core type transformer, there is an air cooling type or an oil cooling type in which the entire transformer is immersed in oil. This oil cooling system has better cooling efficiency than air cooling, but requires a heat exchange device for cooling the cooling oil, which is also problematic in terms of cost.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an efficient cooling method for an inductor coil and a compact size using the cooling method of the present invention. (EN) It is possible to provide an inductor coil capable of passing a large current, and to provide a transformer capable of passing a larger current in a compact size and free of noise radio waves to the outside.

[0011]

The present invention has been made in view of the problems as described above, and a method for cooling an inductor coil according to the present invention is such that an electric wire is spirally wound around an outer periphery of a hollow cylindrical member made of an insulating material. It is a method in which the inductor coil is formed by winding the inductor coil in a circular shape, and cooling water is circulated inside the hollow cylindrical member to cool the inductor coil.

The inductor coil of the present invention is
Cooling water is provided in a hollow cylindrical member made of an insulating material so that the cooling water can flow freely, and an electric wire is spirally wound around the outer circumference of the hollow cylindrical member.

Further, the inductor coil of the present invention comprises a hollow annular member made of an insulating material, through which cooling water can freely flow, and an electric wire spirally wound around the outer periphery of the hollow annular member. is there.

Further, in the inductor coil of the present invention, cooling water is circulated in a hollow annular member made of an insulating material, and a toroidal core is provided in an annular cavity inside the hollow annular member. The wire is spirally wound around the outer circumference of the hollow annular member while being coaxially installed.

In the transformer of the present invention, cooling water is circulated inside a hollow annular member made of an insulating material, and a toroidal core is coaxially installed in an annular cavity inside the hollow annular member. A primary winding and a secondary winding are spirally wound around the outer circumference of the hollow annular member.

[0016]

The cooling method for the inductor coil of the present invention is as follows.
An inductor is formed by spirally winding an electric wire around the outer periphery of a hollow cylindrical member made of an insulator, and a cooling water is circulated inside the hollow cylindrical member to cool the inductor coil. The inductor coil can be cooled from the inside through the hollow cylindrical member made of an insulator.

In the inductor coil using the inductor coil cooling method of the present invention, cooling water is circulated inside a hollow cylindrical member made of an insulating material, and an electric wire is provided on the outer periphery of the hollow cylindrical member. Since the coil is wound in a spiral shape, the coil is cooled through the cylindrical member,
A larger current can be passed.

Furthermore, an inductor coil using the method for cooling an inductor coil according to the present invention is such that a cooling water is circulated inside a hollow annular member made of an insulating material, and the cooling water is provided on the outer periphery of the hollow annular member. Since the wire is formed by spirally winding the wire, the coil is cooled through the annular member, and a larger current can flow.

Further, in the inductor coil using the method for cooling an inductor coil according to the present invention, cooling water is provided in a hollow annular member made of an insulating material so that the cooling water can flow freely inside the hollow annular member. Since the toroidal core is coaxially installed in the annular cavity and the electric wire is spirally wound around the outer periphery of the hollow annular member, the winding and the toroidal core are cooled at the same time, and a larger current is supplied. Can be flushed. Further, since the magnetic flux density in the coil is remarkably increased, the inductance is remarkably increased in proportion to this, and a large inductance can be obtained with a small number of turns. Furthermore, there is almost no leakage magnetic flux from the toroidal core to the outside.

A transformer using the method for cooling an inductor coil according to the present invention has a hollow annular member made of an insulating material, through which cooling water can flow freely, and an annular cavity inside the hollow annular member. Since the toroidal core is coaxially installed in the portion, and the primary winding and the secondary winding are spirally wound around the outer periphery of the hollow annular member, the winding and the toroidal core are simultaneously formed. It is cooled and can carry a larger current. Furthermore, since there is almost no leakage magnetic flux from the toroidal core to the outside, the electromagnetic coupling rate also increases.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for cooling an inductor coil according to the present invention and an inductor coil using the method will be described with reference to the drawings. FIG. 1 is a first embodiment of an inductor coil using the method for cooling an inductor coil according to the present invention. The inductor coil 1 is constructed by spirally winding a conductive wire 3 covered with an insulator such as enamel or Teflon around a hollow cylindrical member 5 made of an insulator such as ceramics or plastics at an appropriate pitch. ing.

Flange portions (7A, 7B) are provided at both ends of the cylindrical member 5, and caps (9A, 9B) are fixed to the flange portions by bolts (not shown) or the like. The caps at both ends are provided with water supply / drain holes (11A, 11B) for supplying / draining cooling water. Sealing members (13A, 13B) are interposed between the flange portion and the cap so that cooling water does not leak from the flange portion. The cylindrical member 5 and the caps (9A, 9B) may be integrally molded and used. In that case, the sealing members (13A, 13B) are unnecessary.

The axial length and diameter of the cylindrical member 5 are appropriately manufactured according to the magnitude of the inductance required for the inductor coil 1, and the temperature and flow rate of the cooling water are The temperature of the coil is appropriately set so as to be below a certain temperature.

In order to cool the inductor coil 1 having the above structure, cooling water having an appropriate temperature and flow rate is fed into the cylindrical member 5 through the cooling water supply port. The supplied cooling water cools the inductor coil from the inside through the cylindrical member 5, and the cooling water whose temperature has risen by this is discharged from the drain port facing the water inlet, and the inductor coil 1 is efficiently Will be cooled. It should be easily understood that the inductor coil 1 is
It is also possible to insert a magnetic core into the cylindrical member 5 to form a cored coil.

A second embodiment of the inductor coil using the inductor coil cooling method of the present invention is shown in FIGS. Referring to FIG. 2, in the inductor coil 20 of the second embodiment, a conductive wire 3 in which an outer circumference of a hollow annular member 21 in which a tubular member is formed in an annular shape is covered with an insulator such as enamel or Teflon. Is wound with an appropriate number of turns.

FIG. 3 is a side sectional view taken along the line III-III in FIG. 2 and is shown without the conductive line 3. The internal structure of the hollow annular member 21 will be described with reference to FIG. The hollow annular member 21 is composed of an annular member main body 23 and a lid member 25 having a U-shaped cross section, and the annular member main body 23 and the lid member 25 are not shown such as “screws”. It is fixed by appropriate fixing means. A seal member (27A, 27B) such as a ring-shaped O-ring is provided between the annular member main body 23 and the lid member 25.
The material of the annular member main body 23 and the lid member 25 is made of an insulating material such as ceramics or plastics like the cylindrical member 5.

An inlet 31 for cooling water is provided in the annular cavity 29 formed inside the hollow annular member 21 having the above-mentioned structure.
And a discharge port 33 are provided, and the cooling water supplied from the cooling water inlet 31 flows into the annular cavity 29.
It is divided into directions and flows to be discharged from the discharge port 33 to the outside. Further, in the annular cavity 29,
A toroidal core 35 having a strong magnetic flux confinement action is installed coaxially with the annular member body 23.

With the above structure, the conductive wire 3 and the toroidal core 35 wound around the outer circumference of the hollow annular member 21 are efficiently cooled by the cooling water flowing through the cavity 29, so that the conventional air cooling system is used. It is possible to pass a larger current than the inductor coil. Also, this toroidal core 35
As a result, the magnetic flux density in the coil increases remarkably, and the inductance also increases remarkably in proportion to this. That is, when compared with the air-core coil, the coil with the toroidal core can obtain a large inductance with a small number of turns. In addition, since the magnetic flux does not leak to the outside of the toroidal core, the coil containing the toroidal core does not emit noise radio waves to the outside.

The cross-sectional shape of the annular member 21 is not limited to the "U" shape. For example, if the circular-shaped member 21 has a circular cross-sectional shape, the conductive wire for a coil can be easily wound.

FIG. 4 shows an embodiment of a transformer using the method for cooling an inductor coil according to the present invention. The configuration of the transformer 40 shown in FIG. 4 is the same as that of the inductor coil 20 except for the winding method of the coil, and the description of the same components will be omitted. The transformer 40 is formed by winding a primary winding 41 and a secondary winding 43 around the outer circumference of the hollow annular member 21.

As in the case of the inductor coil 20, the primary winding 41 and the secondary winding 43 of the transformer 40 having the above structure are efficiently cooled by the cooling water flowing through the cavity 29. Therefore, a large current can be passed. Moreover, since the magnetic flux density in the coil is remarkably increased by the toroidal core 35, the electromagnetic coupling rate is large and the energy loss of the transformer is small. Moreover, since the magnetic flux does not leak to the outside of the toroidal core, no noise radio wave is emitted to the outside.

[0032]

As can be understood from the above description of the embodiments, the cooling method for inductor coils according to the present invention is
An inductor is formed by spirally winding an electric wire around the outer periphery of a hollow cylindrical member made of an insulator, and a cooling water is circulated inside the hollow cylindrical member to cool the inductor coil. The inductor coil can be cooled efficiently.

In the inductor coil using the inductor coil cooling method of the present invention, cooling water is circulated in a hollow cylindrical member made of an insulating material,
Since the electric wire is spirally wound around the outer circumference of the hollow cylindrical member, it is possible to manufacture a coil capable of passing a larger current in a compact size without using a tube or the like for winding the coil. .

Furthermore, in the inductor coil using the inductor coil cooling method of the present invention, cooling water is provided in a hollow annular member made of an insulating material so that cooling water can flow through the hollow annular member. Since the electric wire is wound in a spiral shape, it is possible to pass a larger current with a compact size like a non-circular coil.

Further, in the inductor coil using the method for cooling an inductor coil according to the present invention, cooling water is provided in a hollow annular member made of an insulating material so that cooling water can flow through the inside of the hollow annular member. Since the toroidal core is coaxially installed in the annular cavity and the electric wire is spirally wound around the outer periphery of the hollow annular member, the winding and the toroidal core are cooled at the same time, and a larger current is supplied. Can be flushed. Further, since there is almost no leakage magnetic flux from the toroidal core to the outside, a large inductance can be obtained with a small number of turns. As a result, a compact size coil can be manufactured. And since there is almost no leakage magnetic flux, there is no noise radio wave from the coil to the outside.

A transformer using the method for cooling an inductor coil according to the present invention has a hollow toroidal member made of an insulating material, through which cooling water can freely flow, and an annular cavity inside the hollow toroidal member. Since the toroidal core is coaxially installed in the portion, and the primary winding and the secondary winding are spirally wound around the outer periphery of the hollow annular member, the winding and the toroidal core are simultaneously formed. It is cooled and can carry a larger current. Moreover, since there is almost no leakage magnetic flux from the toroidal core to the outside, the electromagnetic coupling rate also increases, and the energy loss in the transformer decreases. Also, since there is almost no leakage magnetic flux, no noise radio waves are transmitted from the coil to the outside.

[Brief description of drawings]

FIG. 1 is a first embodiment of an inductor coil using the inductor coil cooling method of the present invention.

FIG. 2 is a second example of an inductor coil using the method for cooling an inductor coil according to the present invention.

FIG. 3 is a view in which a conductive wire 3 is excluded from a side sectional view taken along line III-III in FIG.

FIG. 4 is an example of a transformer using the inductor coil cooling method of the present invention.

[Explanation of symbols]

 1 Inductor Coil 3 Conductive Wire 5 Cylindrical Member 7A, 7B Flange 9A, 9B Cap 11A, 11B Water Supply / Drainage Hole 20 Inductor Coil 21 Hollow Annular Member 23 Annular Member Main Body 25 Lid Member 29 Annular Cavity 35 Toroidal Core 40 Transformer 41 Primary winding 43 Secondary winding

Claims (5)

[Claims] 1. An inductor coil 1 comprising an electric wire 3 spirally wound around an outer circumference of a hollow cylindrical member 5 made of an insulating material.
And cooling water is flowed through the hollow cylindrical member 5 to cool the inductor coil. 2. An inductor, characterized in that cooling water is circulated inside a hollow cylindrical member (5) made of an insulating material, and an electric wire (3) is spirally wound around the outer circumference of the hollow cylindrical member (5). coil. 3. An inductor, characterized in that cooling water is freely circulated inside a hollow annular member (21) made of an insulator, and an electric wire (3) is spirally wound around the outer periphery of the hollow annular member (21). coil. 4. A hollow toroidal member 21 made of an insulating material is provided so that cooling water can flow freely, and a toroidal core 35 is coaxially installed in an annular cavity 29 inside the hollow toroidal member 21. The electric wire 3 is provided on the outer circumference of the hollow annular member 21.
A coil for an inductor, which is formed by spirally winding. 5. A cooling water is circulated in an inside of a hollow annular member 21 made of an insulating material, and a toroidal core 35 is coaxially installed in an annular hollow portion 29 inside the hollow annular member 21. The primary winding 4 is provided on the outer circumference of the hollow annular member 21.
A transformer characterized in that the first winding and the secondary winding 43 are wound in a spiral shape.