JP2004222440A - Electromagnet and vibration tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit high thermal resistance performance at a low cost without upsizing an excitation coil. <P>SOLUTION: In an electromagnet comprising a coil (3) formed by laminating a plurality of layers in a direction in which the coil layers (3R) wound with windings (31) along the direction of an axis of a core, heat dissipation members (32) projecting from both ends (3E) in the direction of a central axis of the coil layers (3R) are arranged between the coil layers (3R). <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnet and a vibration tester.
[0002]
[Prior art]
Conventionally, by conducting vibration tests under various vibration conditions from relatively small parts in the electric and electronic fields to relatively large products in the aerospace field, the seismic resistance and durability of the parts and products have been improved. A vibration tester is known as a device for examining and evaluating the performance (for example, see Patent Document 1).
In a vibration tester, an alternating current is supplied to a movable coil in a DC magnetic field formed by an exciting coil, so that the movable coil vibrates. A vibration test is to be performed.
The exciting coil 3a has a sectional shape as shown in FIG. 3, and a winding 31a is spirally wound over a plurality of layers. When a current is supplied to the exciting coil 3a, heat is generated, and the amount of temperature rise of the exciting coil 3a due to the generated heat greatly differs depending on the location of the exciting coil 3a. For example, in FIG. 3, in a region A on the outer peripheral portion of the exciting coil 3 a, since the winding 31 a is in contact with the outside air, the amount of temperature rise is relatively small, but in a region B inside the exciting coil 3 a, Since the periphery is surrounded by the winding 31a, the generated heat cannot be released to the outside of the exciting coil 3a, and the amount of temperature rise is larger than that in the area A of the outer peripheral portion.
For this reason, the winding 31a has been used that conforms to the region B where the highest heat resistance is required.
[0003]
[Patent Document 1]
JP-A-2002-310846 (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the region A on the outer peripheral portion of the exciting coil 3a, the winding 31a made of a material that can withstand the heat generation in the region B, though it does not need heat resistance enough to match the internal region B. Is used, so that there is a problem that the cost increases. A method of using a heat pipe to release the heat inside the excitation coil 3a to the outside is also conceivable. However, there is a problem that the size of the excitation coil 3a increases and the cost increases.
[0005]
Therefore, an object of the present invention is to provide an electromagnet and a vibration tester that can exhibit high heat resistance at low cost without increasing the size of the excitation coil.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is, for example, as shown in FIG. 2, a coil layer (3R) in which a winding (31) is wound along the axial direction of the core. An electromagnet having a plurality of coils (3) laminated in a direction away from the axis, wherein a heat radiating member (32) projecting from both ends (3E) of the coil layer (3R) in the central axis direction is provided on the coil layer (3R). ).
[0007]
According to the first aspect of the present invention, when current is supplied to the winding, the winding generates heat and the temperature of the coil rises. At this time, the winding located outside the coil is cooled by being exposed to the outside air, and the winding located inside the coil is cooled by transmitting the generated heat to the heat dissipation member. Further, since the heat dissipating member transferred from the winding projects from both ends in the direction of the center axis of the coil, the projecting portion is cooled by being exposed to the outside air.
Therefore, the heat generated in the coil can be released by a simple method in which the heat radiating member is provided between the coil layers, and high heat resistance can be exhibited at low cost without increasing the size of the coil.
[0008]
The invention according to claim 2 is characterized in that the heat radiation member (32) is provided so as to cover at least one of an inner surface side and an outer surface side of the coil layer (3R).
[0009]
According to the second aspect of the present invention, since the heat radiating member is provided so as to cover at least one of the inner surface side and the outer surface side of the coil layer, the winding can be cooled uniformly.
[0010]
According to a third aspect of the present invention, there is provided an exciting coil (3) for forming a DC magnetic field by passing a DC current, and a DC magnetic field formed by the exciting coil (3). And a movable coil (4) that drives an up and down direction by forming an AC magnetic field by the excitation coil (3). A plurality of coil layers (3R) wound along the axial direction of the coil layer (3R) laminated in a direction away from the predetermined axis, and a heat radiating member (32) protruding from both axial end portions (3E) of the coil layer (3R). Is provided between the coil layers (3R).
For example, as shown in FIGS. 1 and 2, an electromagnet according to claim 1 or 2 is provided.
[0011]
According to the third aspect of the invention, since the excitation coil of the vibration tester has the above configuration, the cooling efficiency of the vibration tester can be increased, and the influence of heat on the vibration test result can be reduced. Thus, a more accurate vibration test can be performed.
[0012]
The invention according to claim 4 is characterized in that the heat dissipation member (32) is provided so as to cover at least one of an inner surface side and an outer surface side of the coil layer (3R).
[0013]
According to the fourth aspect of the present invention, since the heat radiating member is provided so as to cover at least one of the inner surface side and the outer surface side of the coil layer, the winding can be cooled uniformly.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an electromagnet and a vibration tester according to an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, an example in which an electromagnet is provided in a vibration tester will be described.
As shown in FIG. 1, a vibration tester 10 includes an inner magnetic pole 1 magnetized to one magnetic pole, an outer magnetic pole 2 magnetized to the other magnetic pole, an exciting coil 3 as an electromagnet for forming a magnetic field, and an exciting coil 3. A movable coil 4 arranged in a magnetic field to be formed, a vibration table 5 attached to the movable coil 4 and mounting the test object S, a vibration table support portion 6 for supporting the vibration table 5 via an air spring 7, and the like. I have.
[0015]
The inner magnetic pole 1 supports the shaking table 5 via the shaking table support 6 and the air spring 7, and is a magnetic material magnetized by the excitation coil 3 to a magnetic pole different from the outer magnetic pole 2.
The outer magnetic pole 2 is a magnetic body provided outside the inner magnetic pole 1 and magnetized by the exciting coil 3.
[0016]
The excitation coil 3 is housed inside the outer magnetic pole 2 so as to surround the outer periphery, and is provided in two layers in the vertical direction with a protrusion 2 a formed along the circumference on the wall surface of the outer magnetic pole 2. . The exciting coil 3 is connected to a DC power supply, and when a DC current flows, a DC magnetic field crossing the movable coil 4 is provided in a gap G between the protrusion 2a of the outer magnetic pole 2 and the inner magnetic pole 1 which is a magnetic material. Is formed.
As shown in FIG. 2, the exciting coil 3 is stacked in a plurality of layers such that a coil layer 3 </ b> R formed by winding the winding 31 along the axial direction of the exciting coil 3 spreads concentrically. Is provided with a copper plate 32 as a heat radiation member so as to cover the outer surface of each coil layer 3R of the exciting coil 3. As a result, the space between the coil layers 3R is shielded by the copper plate 32, and the heat generated from the windings 31 in each coil layer 3R is transferred to the adjacent copper plate 32, and The structure is such that heat is not transferred to the 3R winding 31.
Further, the copper plate 32 is provided so as to protrude from both ends 3E in the axial direction of the coil layer 3R formed by the windings 31 so that the heat of the copper plate 32 can be radiated at both ends 3E exposed to the outside air. Has become.
[0017]
The movable coil 4 is connected to a power supply capable of supplying an alternating current, and when the alternating current is supplied from the power supply, a force acting on the movable coil 4 in an upward or downward direction is generated, and the vibration table 5 is moved. While being returned to the reference position, the movable coil 4 vibrates in the DC magnetic field formed in the gap G at a frequency based on the frequency of the AC current. Thereby, the test body S attached to the shaking table 5 can be vibrated.
[0018]
The movable coil 4 is fixed to a lower end of a vibrating table 5 supported by an air spring 7 attached to the upper surface of the inner magnetic pole 1, and the vibrating table 5 vibrates when the movable coil 4 vibrates. Further, a test piece S is attached to the shaking table 5, and the test piece S vibrates with the vibration of the shaking table 5, and the vibration characteristics at this time can be measured by an accelerometer (not shown) or the like. ing.
[0019]
According to the excitation coil 3 and the vibration tester 10 of the present embodiment, when a DC current is supplied to the winding 31 of the excitation coil 3, the winding 31 generates heat and the temperature of the excitation coil 3 rises. At this time, the winding 31 located outside the exciting coil 3 is cooled by being exposed to the outside air, and the winding 31 located inside the exciting coil 3 is cooled by transmitting the generated heat to the copper plate 32. . Further, since the copper plate 32 transferred from the winding 31 projects from both ends 3E of the exciting coil 3 in the axial direction, the projecting portion is cooled by being exposed to the outside air.
Therefore, the heat generated in the exciting coil 3 can be released by a simple method in which the copper plate 32 is provided between the coil layers 3R of the exciting coil 3, so that the cost of the exciting coil 3 is reduced without increasing the size and the heat resistance is increased. Performance can be demonstrated.
Further, since the copper plate 32 is provided so as to cover at least one of the inner surface side and the outer surface side of the coil layer 3R, the winding 31 can be uniformly cooled.
Furthermore, by using the above-described configuration of the exciting coil 3, the cooling efficiency of the vibration tester 10 can be increased, and the influence of heat on the vibration test result can be reduced, so that a more accurate vibration test can be performed. it can.
[0020]
Note that the present invention is not limited to the above embodiment. For example, the heat radiation member is not limited to the copper plate 32 but may be an aluminum plate material. That is, any material can be used as long as it can radiate the heat from the winding 31 to the outside of the exciting coil 3. Further, in the present embodiment, an example has been described in which an electromagnet is provided in the vibration tester 10 as the exciting coil 3, but the electromagnet may be used for other applications such as a motor and a transformer. In addition, changes can be made without departing from the spirit of the invention.
[0021]
【The invention's effect】
According to the first aspect of the present invention, when current is supplied to the winding, the winding generates heat and the temperature of the coil rises. At this time, the winding located outside the coil is cooled by being exposed to the outside air, and the winding located inside the coil is cooled by transmitting the generated heat to the heat dissipation member. Further, since the heat dissipating member transferred from the winding projects from both ends in the direction of the center axis of the coil, the projecting portion is cooled by being exposed to the outside air.
Therefore, the heat generated in the coil can be released by a simple method in which the heat radiating member is provided between the coil layers, and high heat resistance can be exhibited at low cost without increasing the size of the coil.
[0022]
According to the second aspect of the present invention, since the heat radiating member is provided so as to cover at least one of the inner surface side and the outer surface side of the coil layer, the winding can be uniformly cooled.
[0023]
According to the third aspect of the present invention, since the excitation coil of the vibration tester has the above configuration, the cooling efficiency of the vibration tester can be increased, and the influence of heat on the vibration test result can be reduced. Thus, a more accurate vibration test can be performed.
[0024]
According to the fourth aspect of the present invention, since the heat radiating member is provided so as to cover at least one of the inner surface side and the outer surface side of the coil layer, the winding can be uniformly cooled.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a vibration tester according to the present embodiment.
FIG. 2 is a cross-sectional view of an exciting coil according to the present embodiment.
FIG. 3 is a cross-sectional view of an exciting coil according to the related art.
[Explanation of symbols]
3 Excitation coil (electromagnet)
31 Winding 32 Copper plate (heat dissipation member)
3E End of coil layer 3R Coil layer 10 Vibration tester

Claims (4)

An electromagnet having a coil in which a plurality of coil layers in which windings are wound along the axial direction of the core are stacked in a direction away from the axis of the core,
An electromagnet, wherein heat radiating members protruding from both ends of the coil layer in the central axis direction are provided between the coil layers. The electromagnet according to claim 1, wherein the heat radiating member is provided so as to cover at least one of an inner surface side and an outer surface side of the coil layer. An exciting coil that forms a DC magnetic field when a DC current is applied;
A movable coil that is arranged in a DC magnetic field formed by the exciting coil and that drives an up-down direction by forming an AC magnetic field when an AC current is applied;
A vibration testing machine with
The excitation coil, a plurality of coil layers wound around the winding along a predetermined axis direction are stacked in a direction away from the predetermined axis,
A vibration tester, wherein heat radiating members protruding from both ends in the axial direction of the coil layer are provided between the coil layers. The vibration tester according to claim 3, wherein the heat radiation member is provided so as to cover at least one of an inner surface side and an outer surface side of the coil layer.

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