JP2015032683A - Stationary induction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a stationary induction apparatus which allows for suppression of variation in the radiation performance, while withstanding compaction.SOLUTION: A stationary induction apparatus, i.e., a transformer, includes a transformer body having an E core 11 forming a closed circuit, and a coil body 14 constituted by winding a conductor around the leg of the E core 11 directly or via a bobbin. Inside dimensions of the coil body 14 is equal to or larger than the sum of the radial dimension of the leg, and the variation dimension (a) at least of the dimension 12 between the legs.

Description

  The present invention relates to a structure of a stationary inductor such as a transformer or a reactor that is mounted on a device that performs power conversion, and more particularly, an inverter mounted on an electric vehicle having a motor as one of driving sources such as an electric vehicle and a hybrid vehicle. The present invention relates to a static inductor mounted on a power conversion device such as a DC / DC converter or a charger.

The power conversion device mounted on the electric vehicle includes an inverter for driving a motor, a DC / DC converter that steps down the high voltage battery voltage to a 12V battery voltage, and a DC / DC that steps up the voltage from the 12V battery voltage to the high voltage battery voltage. Various power conversion devices such as a converter, a charger for charging a high voltage battery from a commercial power source, and an inverter for generating AC 100 V from the high voltage battery are mounted.
In today's environment surrounding electric vehicles, there is a strong demand for miniaturization and cost reduction of its components, and various power conversion devices mounted on electric vehicles are no exception.

One of the promising means for realizing the reduction in size and cost of these power conversion devices is to increase the switching frequency. Speeding up the switching frequency is one of the very important technological development elements in various power conversion devices because it can reduce the size and cost of huge and expensive transformers and reactors.
However, in transformers and reactors mounted on these devices, the heat generation density inevitably increases when it is attempted to reduce the size thereof, so that it is difficult to make each component below the guaranteed temperature.
Therefore, it is difficult to reduce the size only by electric characteristics, and there is a problem that further improvement of heat dissipation performance of the transformer and the reactor is indispensable.
The heat generation elements of transformers and reactors are mainly divided into heat generation due to copper loss in the windings and heat generation due to iron loss inside the core. As a general basic structure, bobbins around which copper wires are wound are used. Since the structure is inserted into the leg portion of the core, the heat dissipation path of the winding is mainly the heat transfer to the outermost peripheral surface of the winding or the heat dissipation path via the core.
However, since the core itself also generates heat due to iron loss, it is difficult for heat dissipation via the core to be effective, and conversely, the core itself further increases in temperature.
In addition, when the number of turns increases, the heat radiation area of the winding itself is limited to the outer periphery, so that heat tends to be trapped inside.

  As an active measure to improve the heat dissipation of transformers and reactors, the transformer body and reactor body are housed in a heat dissipation case such as metal and filled with a filling material such as potting material to create a space that hinders heat dissipation. Generally, measures to reduce heat resistance from the outer periphery of the winding and the exposed surface of the core to the heat dissipation case and improve heat dissipation are used, but various methods for further improving heat dissipation performance have been proposed. ing.

  For example, a reactor installed in a heat dissipation case is filled with a filler, and the insulation between the coil and the case is secured with this filler, so that the insulation bobbin cover that has been an obstacle to heat dissipation on the heat dissipation path Is known to improve heat dissipation as a result (see, for example, Patent Document 1).

  In addition to filling the reactor installed in the heat dissipation case with a filler, the bobbin is made of a material having a higher thermal conductivity than the filler, and the bobbin is brought into contact with the case. In addition, a heat dissipation path from the bobbin is also effectively used to improve heat dissipation (see, for example, Patent Document 2).

Japanese Patent No. 4946775 JP 2010-272584 A

Although the improvement in heat dissipation is certainly recognized compared to the case where the resin described in the above-mentioned Patent Documents 1 and 2 is simply filled with resin, there is actually a variation in the core and the winding height. For this reason, the outer dimensions are not stable, and as a result, the distance between the case wall surface and the winding outer peripheral surface or the case wall surface and the core varies.
That is, since the thickness of the filler from the case wall surface to the heat dissipation surface varies, there is a problem that the thermal resistance due to the filler varies.
Generally, the variation dimension of the core and winding height is about an order of magnitude larger than that of resin molded parts and metal-worked parts. Especially, the winding height varies depending on the number of windings, so the variation dimension is about several mm. In many cases, this variation is required.
In the above-mentioned Patent Document 1, an example in which the thickness of the filler is 2 mm is described. However, assuming that the outer shape variation dimension of the core is ± 1 mm under these conditions, the thickness variation is a minimum of 1 mm and a maximum of 3 mm. Will occur. Since the thermal resistance is proportional to the length of the heat radiation path, that is, the thickness of the filler, in the above example, a thermal resistance difference of three times is actually generated.

  When the thermal resistance of the filler is θ [K / W] and the amount of heat passing through the filler is P [W], the temperature difference ΔT [K] at the filler portion is

ΔT [K] = P [W] × θ [K / W] (1)

Therefore, when the thermal resistance is tripled, the temperature difference ΔT also varies three times.
ΔT here must be kept at least within the difference between the base temperature of the heat radiation destination and the rated temperature of the component, but the internal heat resistance of the static inductor, the heat resistance due to the structural parts up to the heat radiation destination, etc. Therefore, if a variation of several times occurs in ΔT of the filler portion, the total thermal design is greatly affected.
Of course, when the outer dimension variation size is further increased, the variation of ΔT is further increased, and it becomes more difficult to establish heat to keep each component part below the guaranteed temperature.
In addition, there is a background that heat generation density increases due to miniaturization of transformers and reactors.

In this case, the amount of heat P [W] that passes through the unit area of the filler also increases. Therefore, considering that ΔT is proportional to the amount of passing heat as shown in equation (1), ΔT of the filler portion The fluctuation range further increases, and ΔT other than the filler also increases due to the product with the thermal resistance other than the filler.
Therefore, the external variation size of the static inductor greatly affects the heat establishment design, and in some cases, there is a problem that it is impossible to reduce the size of the static inductor from the viewpoint of heat establishment.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a stationary inductor that can suppress variations in heat dissipation performance and can withstand downsizing.

A stationary inductor according to the present invention includes a stationary body including an inductor body having a core that forms a closed magnetic circuit, and a coil body in which a conductor is wound directly or via a bobbin on a leg portion of the core. An inductor,
The inner dimension of the coil body is not less than a value obtained by adding at least the shape variation dimension of the leg portion in the radial direction to the dimension of the leg portion in the radial direction.

According to the static inductor according to the present invention, the inner dimension of the coil body is equal to or larger than the radial dimension of the leg part plus at least the shape variation dimension of the leg part in the radial direction. The relative position of can be changed.
Therefore, by changing this relative position, the variation in the distance between the coil body and the wall surface of the structure on which the inductor body is mounted is absorbed and a constant value is secured. It is also possible to make the thermal resistance between the two constant.
Therefore, it is possible to obtain a stationary inductor that can suppress variations in heat dissipation performance and can withstand downsizing.

It is a figure which shows the transformer main body of the 1st prior art example. FIG. 2 is a plan sectional view showing the transformer main body of FIG. 1. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 1 of this invention. It is a figure which shows the other example of the transformer main body of the 2nd prior art example. FIG. 5 is a cross-sectional plan view showing the transformer main body of FIG. 4. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 2 of this invention. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 3 of this invention. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 4 of this invention. It is a front sectional view showing a transformer body of a transformer according to a fifth embodiment of the present invention. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 6 of this invention. It is a front sectional view showing a transformer body of a transformer according to a seventh embodiment of the present invention. It is a plane sectional view showing a transformer main part of a transformer of Embodiment 8 of this invention. It is a front sectional view showing a transformer body of a transformer according to a ninth embodiment of the present invention. It is a front sectional view showing a transformer body of a transformer according to a tenth embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
FIG. 1A is a perspective view showing a transformer main body of a transformer which is a stationary inductor of a first conventional example, and FIG. 1B is an exploded perspective view showing the transformer main body of FIG.
The transformer main body includes an E core 11 that forms a closed magnetic circuit, and a coil body 14 that is configured by winding a conductor around a central leg portion of the E core 11.
The E core 11 includes an E core upper part 11a and a core lower part 11b.
In FIG. 1B, reference numeral 12 indicates a dimension between the leg portions between the center line of the outer leg portion of the E core 11 and the center line of the center leg portion of the E core 11, and reference numeral 13 indicates the E core 11. The leg part width dimension between both side surfaces facing the outer leg parts in the central leg part, reference numeral 15 indicates the coil body inner dimension of the annular coil body 14.
The inter-leg dimension 12 is A ± a [mm], the central leg width dimension 13 is B ± b [mm], and the coil body inner dimension 15 is C [mm]. ± a [mm] and ± b [mm] indicate variation dimensions.

2A to 2C, there is a variation of ± a [mm] in the dimension 12 between the legs of the transformer main body of FIGS. 1A and 1B, and the coil body inner dimension 15 is C [ It is a figure for demonstrating the fluctuation | variation of each relative position of the coil body 14 and E core 11 which arises when it is constant at mm].
FIG. 2A is a diagram showing a state where the inter-leg dimension 12 is the maximum value (A + a) [mm].
FIG. 2B is a diagram illustrating a state where the inter-leg dimension 12 is a median value A [mm].
FIG.2 (c) shows the state whose dimension 12 between legs is the minimum value (Aa) [mm].
Reference numeral 21 denotes a reference surface corresponding to the wall surface of the case which is a structure on which the transformer main body is mounted.

In the case of this transformer body, as shown in FIG. 2A, when the inter-leg dimension 12 reaches the maximum value (A + a) [mm], the position of the coil body 14 from the reference plane 21 is the E core 11. Therefore, the dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is the maximum dimension 22a.
Further, as shown in FIG. 2C, when the inter-leg dimension 12 becomes the minimum value (Aa) [mm], the position of the coil body 14 from the reference plane 21 is the position of the E-core middle leg. Therefore, the dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is the minimum dimension 22b.
Therefore, the position of the coil body 14 with respect to the reference surface 21 is due to variations in the dimension 12 between the legs of the E core 11, and the dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is the maximum dimension 22a and the minimum dimension 22b. Fluctuate between.
In this case, the variation in the dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is the same as the fact that the distance between the wall surface of the case, which is a structure on which the transformer body is mounted, and the transformer body varies. is there.
That is, when the case in which the transformer body is mounted is filled with a filler, the distance at the site between the wall surface of the case and the outer peripheral surface of the coil body 14 varies, and the heat in the filler at that site is changed. The resistance fluctuates, resulting in a difficulty in designing each component below the guaranteed temperature.

3 (a) to 3 (c) are plan sectional views showing the transformer body of the transformer, which is a stationary inductor according to the first embodiment of the present invention, in which such an inconvenience is solved.
In this embodiment, the coil body inner dimension 15 is set to (C + 2a) [mm] by adding a variation width of ± a [mm] of the inter-leg dimension 12 to the conventional coil body inner dimension C [mm]. .
FIG. 3A shows a state where the inter-leg dimension 12 is the maximum value (A + a) [mm].
FIG. 3B shows a state where the inter-leg dimension 12 is a median value A [mm].
FIG. 3C shows a state where the inter-leg dimension 12 is a minimum value (Aa) [mm].
Reference numeral 32 denotes a dimension from the reference surface 21 to the outer peripheral surface of the coil body 14.

As shown in FIG. 3A, when the inter-leg dimension 12 is the maximum value (A + a) [mm], the coil body inner dimension 15 of the coil body 14 is The dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is as indicated by reference numeral 32 because it is set to (C + 2a) [mm] which is equal to or larger than the dimension including the variation of the inter-part dimension 12 + a [mm].
Further, as shown in FIG. 3C, the position of the coil body 14 is such that when the inter-leg dimension 12 becomes the minimum value (Aa) [mm], the coil body inner dimension 15 is Since (C + 2a) [mm] is equal to or greater than the dimension including the variation of dimension 12 + a [mm], the dimension from the reference surface 21 to the outer peripheral surface of the coil body 14 is also 32 as in FIG. It can be.

With this configuration, the position of the coil body 14 can be made constant with respect to the reference plane 21 even if the inter-leg dimension 12 has a variation of the maximum value (A ± a) [mm]. it can.
Therefore, the variation of the leg-to-leg dimension 12 can be absorbed by increasing the coil body inner dimension 15 of the coil body 14, and the wall surface of the case, which is a structure on which the transformer body is mounted, and the coil body 14 can be absorbed. A transformer capable of maintaining a constant distance from the outer peripheral surface, that is, a filler thickness, can be obtained.
Further, since the variation in the dimension 12 between the leg portions is absorbed by the coil body inner dimension 15 of the coil body 14, the degree of freedom in design when the transformer body is incorporated in the case is improved.
Further, the transformer of this embodiment does not exceed the original maximum outer shape of the E core 11, and is the same size as the conventional one, and does not bother to increase in size.

Embodiment 2. FIG.
FIG. 4A is a perspective view showing a transformer body of a transformer which is a stationary inductor of a second conventional example, and FIG. 4B is an exploded perspective view showing the transformer body of FIG. 4A.
The transformer main body includes a U core 41 that forms a closed magnetic circuit, and two coil bodies 44 a and 44 b that are configured by winding a conductor around both legs of the U core 41.
The U core 41 includes a U core upper part 41a and a U core lower part 41b.

In FIG. 4B, reference numeral 42 denotes a leg-to-leg dimension between both legs of the U core 41, reference numeral 43 denotes a leg width dimension of the U core 41, and reference numerals 45a and 45b denote annular coil bodies. The coil body inner side dimension of 44a, 44b is shown.
The inter-leg dimension 42 is (A ± a) [mm], the leg width dimension 43 is (B ± b) [mm], and the coil body inner dimensions 45a and 45b are C [mm]. ± a [mm] and ± b [mm] indicate variation dimensions.

5 (a) to 5 (c), there is a variation of ± a [mm] in the dimension 42 between the legs of the U core 41 in FIGS. 4 (a) and 4 (b), and the coil body inner dimensions 45a and 45b. FIG. 10 is a diagram for explaining a change in relative positions of the coil body 44 and the U core 41 that occurs when C is constant at C [mm].
FIG. 4A is a diagram showing a state where the inter-leg dimension 42 is the maximum value (A + a) [mm].
FIG. 4B is a diagram showing a state in which the inter-leg dimension 42 is a median value A [mm].
FIG. 4C shows a state where the inter-leg dimension 42 is the minimum value (A−a) [mm].
Reference numeral 51 denotes a reference surface corresponding to the wall surface of the case which is a structure on which the transformer main body is mounted.

In the case of this transformer body, as shown in FIG. 5A, when the inter-leg dimension 42 reaches the maximum value (A + a) [mm], the positions of the coil bodies 44a and 44b from the reference plane 51 are U Since the position corresponds to the position of the core leg, the dimension from the reference surface 51 to the outer peripheral surface of the coil bodies 44a and 44b is the minimum dimension 52a.
Further, as shown in FIG. 5C, when the inter-leg dimension 42 is the minimum value (Aa) [mm], the positions of the coil bodies 44a and 44b from the reference plane 51 are the U-core leg parts. Since the position corresponds to the position, the dimension from the reference surface 51 to the outer peripheral surfaces of the coil bodies 44a and 44b is the maximum dimension 52b.
Accordingly, the positions of the coil bodies 44a and 44b with respect to the reference surface 51 are different from each other in the dimension 42 between the leg portions of the U core 41, and the dimensions from the reference surface 51 to the outer peripheral surface of the coil body 14 are the minimum dimension 52a and the maximum dimension 52b. Fluctuate between.
In this case, the change in dimension from the reference surface 51 to the outer peripheral surface of the coil bodies 44a and 44b results in the distance between the wall surface of the case, which is a structure on which the transformer main body is mounted, and the transformer main body changing. It is synonymous.
That is, when a filler is filled in a case on which a transformer body is mounted, the distance between the wall surface of the case and the outer peripheral surface of the coil bodies 44a and 44b varies, and the filler at that portion is changed. As a result, the thermal resistance of the material fluctuates, which makes it difficult to design each component below the guaranteed temperature.

6 (a) to 6 (c) are plan sectional views showing the transformer main body of the transformer according to the second embodiment of the present invention, in which such an inconvenience is eliminated.
In this embodiment, the coil body inner dimensions 45a and 45b are obtained by adding a variation width of ± a [mm] of the inter-leg dimension 42 to the conventional coil body inner dimension C [mm] (C + a) [mm]. It is said.
FIG. 6A shows a state where the inter-leg dimension 42 is the maximum value (A + a) [mm].
FIG. 6B shows a state where the inter-leg dimension 42 is a median value A [mm].
FIG. 6C shows a state in which the inter-leg dimension 42 is the minimum value (Aa) [mm].
Reference numeral 62 denotes a dimension from the reference surface 51 to the outer peripheral surfaces of the coil bodies 44a and 44b.

As shown in FIG. 6A, when the inter-leg dimension 42 is the maximum value (A + a) [mm], the coil body inner dimensions 45a and 45b are the variation of the inter-leg dimension 42 + a [mm. ] Is taken into consideration (C + a) [mm], so that the coil bodies 44a and 44b are in positions where the dimension from the reference surface 51 to the outer peripheral surface of the coil bodies 44a and 44b is 62.
Further, as shown in FIG. 6C, when the inter-leg dimension 42 is the minimum value (A−a) [mm], the coil body inner dimensions 45a and 45b are the variation of the inter-leg dimension 42 + a Since the dimension (C + a) [mm] including [mm] is used, the coil bodies 44a and 44b have the same dimensions from the reference surface 51 to the outer peripheral surfaces of the coil bodies 44a and 44b as in FIG. 62.

With this configuration, the positions of the coil bodies 44a and 44b are such that even if the inter-leg dimension 42 has a variation (A ± a) [mm], the outer peripheral surfaces of the coil bodies 44a and 44b from the reference surface 61. The dimensions up to can be made constant.
Therefore, even if there are two or more coil bodies, the variation in the dimension 42 between the leg portions can be absorbed by increasing the coil body inner dimensions 45a and 45b of the coil bodies 44a and 44b. It is possible to obtain a transformer in which the distance between the wall surface of the case, which is a structure to be mounted, and the outer peripheral surfaces of the coil bodies 44a and 44b, that is, the filler thickness can be made constant.
Moreover, since the variation in the dimension 42 between the leg portions is absorbed by the coil body inner dimensions 45a and 45b of the coil bodies 44a and 44b, the degree of freedom in design when the transformer body is incorporated in the case is improved.
Furthermore, the transformer of this embodiment does not exceed the original maximum outer shape of the U core 41, and is the same size as the conventional one, and does not bother to increase in size.

Embodiment 3 FIG.
In the first and second embodiments, the variation dimensions of the cores 11 and 41 are absorbed without enlarging the outer shape of the transformer, and from any reference surface 21 or 51 to the transformer main body, particularly the coil bodies 14, 44a, and 44b. Although the example in which the distance variation is absorbed to make the distance constant has been shown, the cause of the occurrence of this distance variation is also the variation in the conductor winding height of the coil bodies 14, 44a and 44b.
In this embodiment, a configuration example will be described in which the conductor winding height variation is absorbed and the distance from an arbitrary reference plane is also absorbed to make the distance constant.

FIG. 7 is a plan sectional view showing the transformer body of the transformer according to the third embodiment of the present invention. The coil body inner dimensions 75a and 75b of the coil bodies 74a and 74b are the coil body inner sides shown in the second embodiment. It is the figure made into the dimension which also considered the variation of conductor winding height 76 to the dimensions 45a and 45b.
In this embodiment, the transformer body includes a U core that forms a closed magnetic circuit, and two coil bodies 74a and 74b that are configured by winding a conductor around both leg portions of the U core.
U core leg dimension 72 is (A ± a) [mm], U core leg width dimension 73 is (B ± b) [mm], and conductor winding height 76 is (D ± d) [mm]. To do.
± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
75a and 75b are coil body inner dimensions of the coil bodies 74a and 74b. The coil body inner dimensions 75a and 75b include a variation a of the U core leg dimension 72 and a variation d of the conductor winding height 76. In addition, (C + a + d) [mm].

FIG. 7A shows a state in which the U core leg dimension 72 is the maximum value (A + a) [mm].
FIG. 7B shows a state where the U-core leg-to-leg dimension 72 is a median value A [mm].
FIG.7 (c) shows the state whose dimension 72 between U core leg parts is the minimum value (Aa) [mm].
Reference numeral 81 denotes a reference surface corresponding to the wall surface of the case, which is a structure on which the transformer main body is mounted.
Reference numeral 82 denotes a dimension from the reference surface 81 to the outer peripheral surfaces of the coil bodies 74a and 74b.

As shown in FIG. 7 (a), the coil bodies 74a and 74b have coil body inner dimensions of the coil bodies 74a and 74b when the U core leg dimension 72 reaches the maximum value (A + a) [mm]. 75a and 75b are C + a + d [mm] taking into account the variation a between the U-core leg dimension 72 and the variation d of the conductor winding height 76, so that the coil bodies 74a, The dimension up to the outer peripheral surface of 74b is as indicated by reference numeral 82.
Further, as shown in FIG. 7 (c), the coil bodies 74a and 74b have coil bodies 74a and 74b whose coil body 74a and 74b have a minimum dimension (Aa) [mm] when the dimension 72 between the U core legs is the minimum value. The inner dimensions 75a and 75b are (C + a + d) [mm] that takes into account the variation a between the U-core leg dimension 72 and the variation d of the conductor winding height 76. The dimension to the outer peripheral surface of the coil bodies 74a and 74b is the dimension 82 similar to that of FIG.

  With this configuration, the positions of the coil bodies 74a and 74b have a variation ± a [mm] in the inter-leg dimension 72, and a variation of ± d [mm] in the conductor winding height 76. However, the dimension from the reference surface 81 to the outer peripheral surfaces of the coil bodies 74a and 74b can be made constant.

With this configuration, variations in the coil winding height 76 of the coil bodies 74a and 74b can be absorbed by increasing the coil body inner dimensions 75a and 75b of the coil bodies 74a and 74b, and the transformer main body is mounted. It is possible to obtain a transformer that can suppress the distance between the wall surface of the case, which is a structure, and the outermost peripheral surfaces of the coil bodies 74a and 74b, that is, variation in filler thickness.
Therefore, the transformer of this embodiment can obtain the same effects as the transformers of the first and second embodiments.

Embodiment 4 FIG.
In the third embodiment, the variation in the dimension 72 between the U core legs and the variation in the conductor winding height 76 are absorbed without enlarging the outer shape of the transformer, and the transformer, in particular, the coil body 74a, An example of absorbing the distance variation up to 74b and making the distance constant has been shown, but as a cause of generating this distance variation, the variation of the reference surface itself corresponding to the wall surface of the case that is a structure on which the transformer body is mounted is also included. is there.
In this embodiment, a configuration example is described in which a variation dimension between the wall surface of the case on which the transformer main body is mounted and the transformer main body is also absorbed and the distance is made constant.

FIG. 8 is a cross-sectional plan view showing a transformer body of a transformer according to Embodiment 4 of the present invention. The coil body inner dimensions 75a and 75b shown in Embodiment 3 are further varied between the wall surface and the transformer body. It is the figure which also considered the dimension.
In this embodiment, the transformer body includes a U core that forms a closed magnetic circuit, and two coil bodies 94a and 94b that are configured by winding a conductor around both legs of the U core.
U core leg dimension 92 is (A ± a) [mm], U core leg width dimension 93 is (B ± b) [mm], and conductor winding height 96 is (D ± d) [mm]. To do.
± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
101 is the wall surface of the structure (case) on which the transformer body is mounted, E is the distance between the wall surface and the transformer body from the wall surface 101 to the outer peripheral surfaces of the coil bodies 94a and 94b, and the wall surface / transformer body distance E is Suppose that there is a variation in e [mm] due to a variation in the position of the wall surface 101.

  95a and 95b are coil body inner dimensions of the coil bodies 94a and 94b. The coil body inner dimensions 95a and 95b are a variation a between the U core leg dimension 92, a variation d of the conductor winding height 96, and a wall surface. -(C + a + d + e) [mm] taking into account the variation e of the distance E between the transformer bodies.

FIG. 8A shows the case where the U-core leg-to-core dimension 92 is the maximum value (A + a) [mm], and the variation e of the wall surface / transformer body distance E between the wall surface 101 and the transformer body. The variation dimension 102 indicates the maximum value.
FIG. 8B shows a state where the U-core leg dimension 92 is the maximum value (A + a) [mm] and the variation dimension 102 is the minimum value.
FIG. 8C shows a state where the U-core leg dimension 92 is a median value A [mm] and the variation dimension 102 is the maximum value.
FIG. 8D shows a state in which the U core leg dimension 92 is the median value A [mm] and the variation dimension 102 is the minimum value.
FIG. 8E shows a state in which the U core leg dimension 92 is the minimum value (Aa) [mm] and the variation dimension 102 is the maximum value.
FIG. 8F shows a case where the U core leg dimension 92 is the minimum value (Aa) [mm] and the variation dimension 102 is the minimum value.

In the case of FIG. 8A, the coil body inner dimensions 95a and 95b of the coil bodies 94a and 94b are the variation of the inter-leg dimension 92 + a [mm], the variation of the conductor winding height 96 d [mm], the wall surface Since it is (C + a + d + e) [mm] taking into account the variation + e of the distance E between the transformer bodies, it is equal to the maximum value of the variation dimension 102.
Further, in the case of FIG. 8B, it becomes equal to the minimum value of the variation dimension 102.
Similarly to FIG. 8A, in the case of FIG. 8C and FIG. 8E, it becomes equal to the maximum value of the variation dimension 102.
Similarly to FIG. 8B, in the case of FIG. 8D and FIG. 8F, it becomes equal to the minimum value of the variation dimension 102.

For this reason, the positions of the coil bodies 94a and 94b are the variation a [mm] of the dimension 92 between the U core legs, the variation d [mm] of the coil body winding height 96, and the wall-to-transformer body distance E. Even if there is a variation e, the distance E between the wall surface and the transformer body can always be constant.
With this configuration, the variation e in the distance E between the wall surface and the transformer body can be absorbed by the coil bodies 94a and 94b, so that the same effect as the transformer of the first embodiment can be obtained.

Embodiment 5 FIG.
Up to the fourth embodiment, the transformer capable of absorbing the distance variation to the reference surfaces 21, 51, 81 or the wall surface 101 has been described. However, the coil bodies 94a, 94b are provided for the U core by the amount of absorbing the variation. There was a problem that would be idle.
In this embodiment, a configuration example will be described in which the coil bodies 94a and 94b are fixed to the U core in a state where variations in the coil bodies can be absorbed.

FIG. 9 is a front sectional view showing a transformer body of a transformer according to Embodiment 5 of the present invention. In the transformer of Embodiment 4, a coil body that determines and fixes the position of a coil body with respect to a predetermined reference position. It is a figure with a position fixing means.
In this embodiment, the U core leg dimension 112 is (A ± a) [mm], the U core leg width dimension 113 is (B ± b) [mm], and the conductor winding height 116 is (D ±). d) Set to [mm].
Reference numerals 114a and 114b denote coil bodies, respectively, and 117a and 117b denote bobbins surrounding the outer periphery of the U core leg.
± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
The coil bodies 114a and 114b are configured by winding a conductor around bobbins 117a and 117b.
E is the distance between the wall surface 121 and the transformer body, which is the distance between the wall surface 121 and the transformer body. The wall surface / transformer body distance E is assumed to vary e [mm] due to the position variation of the wall surface 121.
In this embodiment, the variation dimension 122 of e is the maximum value, which is a reference surface for mounting the transformer body.
115a and 115b are the coil body inner dimensions of the coil bodies 114a and 114b. The coil body inner dimensions 115a and 115b are a variation a of the U core leg dimension 112, a variation d of the conductor winding height 116, and a wall surface. -(C + a + d + e) [mm] taking into account the variation e of the distance E between the transformer bodies.

118a and 118b are plates provided on the upper and lower surfaces of the bobbins 117a and 117b, and the protrusions F of the bobbins 117a and 117b penetrate the holes formed in the circumferential direction of the plates 118a and 118b, It is fixed to the bobbins 117a and 117b.
The radial width of the plates 118a and 118b is a reference surface for attaching the transformer body to the wall surface 121, and is equal to the width of the wall surface 121.

FIG. 9A shows a state where the U-core leg dimension 112 is the maximum value (A + a) [mm] and the variation dimension 122 is the maximum value.
FIG. 9B shows a state where the dimension 112 between the U core legs is the median value A [mm] and the variation dimension 122 is the maximum value.
FIG. 9C shows a state in which the U-core leg dimension 112 is the minimum value (Aa) [mm] and the variation dimension 122 is the maximum value.

In the configuration of FIG. 9, as shown in FIG. 9A, the positions of the coil bodies 114a and 114b are fixed to the plates 118a and 118b having the same width as the wall surface 121. The position is fixed and fixed by mounting.
Similarly, in FIGS. 9B and 9C, the positions of the coil bodies 114a and 114b are determined and fixed by mounting the transformer main body on the case.

For this reason, the positions of the coil bodies 114a and 114b are the variation ± a [mm] of the dimension 112 between the U core legs, the variation ± d [mm] of the conductor winding height 116, and the variation dimension 122 and e [mm]. Even if it exists, the position of coil body 114a, 114b can be determined and fixed.
Here, the coil body position fixing means for positioning and fixing the coil body with respect to the core includes plates 118a and 118b and bobbins 117a and 117b.

With this configuration, since the positions of the coil bodies 114a and 114b are fixed regardless of the core diameter variation dimension and the core position variation dimension from the reference position, it is possible to provide a transformer with a stable outer dimension and a structure. Assembling to a case becomes easy.
In this embodiment, the protrusions F of the bobbins 117a and 117b are fixed to the plates 118a and 118b. However, even if the coil body is formed by winding only the conductor, the same thing can be said even if the protrusion is attached to the coil body. Effects can be obtained.
In this embodiment, the coil bodies 114a and 114b and the plates 118a and 118b are fixed by providing the projections F on the bobbins 117a and 117b of the coil bodies 114a and 114b and forming holes in the plates. The effect is obtained.

Embodiment 6 FIG.
Although the fifth embodiment has described the configuration example in which the problem that the coil bodies 114a and 114b are loosely moved with respect to the U core is eliminated by using the plates 118a and 118b by absorbing the variation, in this embodiment, this embodiment is described. A structure capable of absorbing the variation of the coil body by means other than the components of the transformer will be described.

FIG. 10 is a plan sectional view showing a transformer main body of a transformer according to a sixth embodiment of the present invention. In the transformer main body according to the fourth embodiment, the coil body is fixed to a predetermined reference position by means other than the components of the transformer. The position is determined, and fixing means for fixing to the determined coil body position is provided.
In this embodiment, the U core leg dimension 132 is (A ± a) [mm], the U core leg width dimension 133 is (B ± b) [mm], and the conductor winding height of the coil bodies 134a and 134b is as follows. 136 is (D ± d) [mm], and a variation dimension 142 between the wall surface 141 of the case of the structure on which the transformer body is mounted and the transformer body is e [mm]. ± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
E is the distance between the wall surface 141 and the transformer body, which is the distance between the wall surface 141 and the transformer body. The wall surface / transformer body distance E is assumed to vary e [mm] due to the position variation of the wall surface 141.
In this embodiment, when the variation dimension 142 of the wall surface 141 is the maximum value, the reference surface for mounting the transformer body is used.

135a and 135b are the coil body inner dimensions of the coil bodies 134a and 134b. The coil body inner dimensions 135a and 135b are a variation a of the U-core leg dimension 132, a variation d of the conductor winding height 136, and a wall surface. -(C + a + d + e) [mm] taking into account the variation e of the distance E between the transformer bodies.
Reference numeral 137 denotes a holder in which a variation dimension 142 between the wall surface 141 of the structure to be mounted and its mounting position is equal to the maximum value of e [mm], 138a and 138b are adhesives, and 139 is a spring.

FIG. 10A shows a state in which the transformer main body is attached to a holder 137 where the U-core leg dimension 142 is equal to the maximum value (A + a) [mm] and the variation dimension 142 is equal to the maximum value width.
FIG. 10B shows a state in which the U-core leg dimension 142 is the maximum value (A + a) [mm] and the variation dimension 142 is the maximum value.
FIG. 10C shows a state where the dimension 142 between the U core legs is the median value A [mm] and the variation dimension 142 is the maximum value.
FIG. 10D shows a state in which the U-core leg dimension 142 is the minimum value (Aa) [mm] and the variation dimension 142 is the maximum value.

In the configuration of FIG. 10, as shown in FIG. 10A, the transformer main body is attached to a holder 137 having a width equal to the wall surface 141 before being mounted on a structure to be mounted.
As for the positions of the coil bodies 134a and 134b, a spring 139 is inserted between the coil bodies 134a and 134b, and the outer side surfaces of the coil bodies 134a and 134b are adjusted to the width of the holder 137. The coil bodies 134 a and 134 b are fixed to the U core with an adhesive 138.

FIGS. 10B, 10C, and 10D are states after being attached to the holder 137 shown in FIG. 10A and positioning and fixing the coil bodies 134a and 134b.
For this reason, the positions of the coil bodies 134a and 134b are the variation ± a [mm] in the dimension 132 between the U core legs, the variation ± d [mm] in the conductor winding height 136, the variation in the variation dimension 142, and e [mm]. ], The positions of the coil bodies 134a and 134b can be determined and fixed.
Here, the coil body position fixing means for positioning and fixing the coil bodies 134a and 134b with respect to the wall surface 141 includes a holder 137, a spring 139, and adhesives 138a and 138b.

  With this configuration, since the positions of the coil bodies 134a and 134b are determined by means other than the components of the transformer main body, the components for determining the positions of the coil bodies 134a and 134b can be omitted, and the assembly to the structure is possible. It is possible to reduce the number of parts, cost and weight while maintaining ease of installation.

Embodiment 7 FIG.
In this embodiment, an example of a structure capable of absorbing variations in the coil body by adding positioning means for positioning with the structure on which the transformer body is mounted to the coil body will be described.
FIG. 11 is a plan sectional view of the transformer body according to the seventh embodiment of the present invention. In the transformer body according to the fourth embodiment, positioning means for positioning with the structure on which the transformer body is mounted is provided on the coil body. It has been added.
In this embodiment, the dimension 152 between the U core legs is (A ± a) [mm], the width dimension 153 of the U core leg is (B ± b) [mm], 154a and 154b are coil bodies, respectively. Show. The winding height 156 of the winding is (D ± d) [mm], 157a and 157b are bobbins surrounding the outer periphery of the core, and the variation dimension 162 between the wall surface 161 of the mounted structure and its mounting position is e [ mm]. ± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
The coil bodies 154a and 154b are configured by winding a conductor around bobbins 157a and 157b.

In this embodiment, the reference surface is attached when the variation dimension 162 of the wall surface 161 of the structure to be mounted is the maximum value.
155a and 155b are the coil body inner dimensions of the coil bodies 154a and 154b. The coil body inner dimensions 155a and 155b are a variation a between the U-core leg dimension 152, a conductor winding height 156 variation d, and a wall surface. -(C + a + d + e) [mm] taking into account the variation e of the distance E between the transformer bodies.
F indicates a protrusion provided on the bobbins 157a and 157b.
FIG. 11A shows a state in which the dimension 152 between the U core legs is the maximum value (A + a) [mm], and the variation dimension 162 is the maximum value.
FIG. 11B shows a state where the dimension 152 between the U core legs is the median value A [mm] and the variation dimension 162 is the maximum value.
FIG. 11C shows a state in which the U-core leg dimension 152 is the minimum value (Aa) [mm] and the variation dimension 162 is the maximum value.

In the configuration of FIG. 11, as shown in FIG. 11A, the positions of the coil bodies 154 a and 154 b are inserted into the grooves of the wall surface 161 of the structure on which the projections F of the bobbins 157 a and 157 b are mounted, and the transformer body is structured. The position is fixed and fixed by mounting on an object.
Similarly, in FIGS. 11B and 11C, the coil bodies 154a and 154b are fixed and fixed by mounting the transformer main body on the structure.
For this reason, the positions of the coil bodies 154a and 154b are the variation ± a [mm] of the dimension 152 between the U core legs, the variation ± d [mm] of the conductor winding height 156, the variation of the variation dimension 162, and e [mm]. ], The positions of the coil bodies 154a and 154b can be determined and fixed.
Here, the coil body position fixing means is constituted by the protrusions F of the bobbins 157a and 157b and grooves formed in the wall surface 161 of the structure.

With this configuration, positioning means for positioning with the structure on which the transformer main body is mounted is added to the coil bodies 154a and 154b, and therefore, when mounted on the structure, the variation dimensions such as the core shape variation are absorbed. The coil body position can be automatically fixed as it is.
Therefore, the assembling property to the device is further facilitated.
Further, since the components for determining the positions of the coil bodies 154a and 154b can be omitted and the fixing means for the positions of the coil bodies 154a and 154b can be omitted, the assembly of the transformer body itself can be improved, and further parts can be obtained. Reduction of points, cost and weight can be realized.
In this embodiment, the structure for positioning the coil body and the structure on which the transformer main body is mounted is provided with a protrusion on the bobbin of the coil body and a groove on the structure on which the transformer main body is mounted. The same effect can be obtained with the reverse configuration.
The shape of the configuration for positioning the coil body and the structure on which the transformer main body is mounted is not limited as long as the same effect can be obtained.

Embodiment 8 FIG.
In this embodiment, a structure capable of absorbing variations in the coil body by providing a spacer having a predetermined thickness between the wall surface of the structure on which the transformer main body is mounted and the outermost circumferential surface of the coil body will be described.
FIG. 12 is a plan sectional view showing a transformer main body according to the eighth embodiment of the present invention. In the transformer main body according to the fourth embodiment, between the wall surface of the structure to be mounted and the outermost peripheral surface of the coil of the coil body. A spacer having a predetermined thickness is provided.
In this embodiment, the U core leg-to-leg dimension 172 is (A ± a) [mm], the U-core leg width dimension 173 is (B ± b) [mm], the coil bodies 174a, 174b, and the conductor winding height. 176 is (D ± d) [mm], and the variation dimension 182 is e [mm]. ± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
181 is the wall surface of the structure on which the transformer body is mounted, E is the distance between the wall surface 181 and the transformer body between the wall surface 181 and the transformer body, and the distance E between the wall surface and the transformer body is ± e due to the position variation of the wall surface 181. Assume that there is a variation of [mm].
175a and 175b are the coil body inner dimensions of the coil bodies 174a and 174b. (C + a + d + e) [mm] taking into account the variation e of the distance E between the wall surface and the transformer body.

Reference numerals 177a and 177b denote spacers having a thickness equal to the wall surface / transformer body distance E between the wall surface 181 and the stationary inductor, and are attached to the outermost circumferential surfaces of the coil bodies 174a and 174b. Reference numeral 179 denotes a spring.
FIG. 12A shows a state in which the U-core leg dimension 172 is the maximum value A + a [mm] and the variation dimension 182 is the maximum value.
FIG. 12B shows a state in which the U-core leg dimension 172 is the maximum value A + a [mm] and the variation dimension 182 is the minimum value.
FIG. 12C shows a state in which the U-core leg dimension 172 has a median value A [mm] and the variation dimension 182 has a maximum value.
FIG. 12D shows a state in which the U-core leg dimension 172 has a median value A [mm] and the variation dimension 182 has a minimum value.
FIG. 12E shows a state in which the U-core leg dimension 172 is the minimum value (Aa) [mm] and the variation dimension 182 is the maximum value.
FIG. 12F shows a state in which the U-core leg dimension 172 is the minimum value (Aa) [mm] and the variation dimension 182 is the minimum value.

In the configuration of FIG. 12, as shown in FIG. 12A, the positions of the coil bodies 174a and 174b are equal to the width of the wall surface 181 of the structure mounted by the spacers 177a and 177b, so that the transformer body is mounted on the structure. Thus, the position is determined and fixed while the distance E between the wall surface and the transformer body is maintained.
As shown in FIG. 12B, the coil bodies 174a and 174b are positioned on the wall surface 181 of the structure on which the coil bodies 174a and 174b to which the spacers 177a and 177b are attached are mounted on the structure and mounted by the spring 179. The position is determined and fixed while maintaining the distance E between the wall surface and the transformer body by pressing.

Similarly, in FIGS. 12C, 12D, 12E, and 12F, the transformer body is mounted on the structure and pressed between the wall surface 181 of the structure mounted by the spring 179, so that the space between the wall surface and the transformer body is the same. The position is determined and fixed while the distance E is maintained.
For this reason, the positions of the coil bodies 174a and 174b are a variation ± a [mm] of the U-core leg dimension 172, a variation ± d [mm] of the coil body winding height 176, and a variation dimension 182 variation. Even if there is e [mm], the positions of the coil bodies 174a and 174b can be determined and fixed.
Here, the coil body position fixing means includes spacers 177 a and 177 b and a spring 179.

  With this configuration, spacers 177a and 177b having a predetermined thickness are provided between the wall surface of the structure on which the transformer body is mounted and the outermost peripheral surfaces of the coils of the coil bodies 174a and 174b. In addition to the variation in the diameter, the variation in the core position from the reference position, and the variation in the coil winding height, the variation between the wall surface of the mounted structure and the outermost peripheral surface of the coil is absorbed, and the wall surface and coil of the structure are absorbed. The outermost peripheral surface can be fixed at a predetermined width.

Embodiment 9 FIG.
In this embodiment, a structure capable of absorbing variations in the coil body by adding positioning means for positioning with the structure on which the transformer body is mounted to the outermost peripheral surface of the coil body will be described.
FIG. 13 is a front sectional view showing a transformer main body according to the ninth embodiment of the present invention. In the transformer main body according to the fourth embodiment, positioning means for positioning with the structure on which the transformer main body is mounted is a coil body. It is a figure added to the outermost peripheral surface of the coil.
In this embodiment, the U-core leg-to-leg dimension 192 is (A ± a) [mm], the U-core leg width dimension 193 is (B ± b) [mm], and the conductor winding height 196 is (D ±). d) [mm], and 194a and 194b denote coil bodies, respectively.
Reference numerals 177a and 197b denote bobbins surrounding the outer periphery of the core, and a variation dimension 202 between the wall surface 201 of the structure to be mounted and its mounting position is e [mm]. ± a [mm], ± b [mm], and ± d [mm] are variation dimensions.
The coil bodies 194a and 194b are composed of coils in which conductors are wound around bobbins 177a and 197b.
Reference numeral 198 denotes a spacer attached to the outermost peripheral surface of the coils of the coil bodies 194a and 194b.
The wall surface 201 of the structure to be mounted has a groove, and the spacer 198 has a protrusion.

In this embodiment, the reference plane on which the transformer main body is attached is when the variation dimension 202 of the wall surface 201 of the mounted structure is the maximum value.
195a and 195b are the coil body inner dimensions of the coil bodies 194a and 194b. The coil body inner dimensions 195a and 195b are a variation a between the U core leg dimension 192, a variation d of the conductor winding height 196, and a wall surface. -(C + a + d + e) [mm] taking into account the variation e of the distance E between the transformer bodies.

FIG. 13A shows a state in which the U-core leg dimension 192 is the maximum value (A + a) [mm] and the variation dimension 202 is the maximum value.
FIG. 13B shows a state in which the U-core leg dimension 192 is the median value A [mm] and the variation dimension 202 is the maximum value.
FIG. 13C shows a state where the dimension 192 between the U core legs is the minimum value (Aa) [mm] and the variation dimension 202 is the maximum value.

In the configuration of FIG. 13, as shown in FIG. 13A, the positions of the coil bodies 194 a and 194 b are inserted into the grooves of the wall surface 201 of the structure on which the protrusion F of the spacer 198 is mounted, and the transformer body is used as the structure. The position is fixed and fixed by mounting.
Similarly, in FIGS. 13B and 13C, the positions of the coil bodies 194a and 194b are fixed by mounting the transformer main body on the structure.
For this reason, the positions of the coil bodies 194a and 194b are a variation ± a [mm] of the dimension 192 between the U core legs, a variation ± d [mm] of the coil body winding height 196, a variation of the variation dimension 202, Even if e [mm] is present, the positions and fixing of the coil bodies 194a and 194b can be determined.
Here, the coil body position fixing means includes a spacer 198 having a protrusion and a groove formed in the wall surface 201.

With this configuration, positioning means for positioning with the structure on which the transformer main body is mounted is added to the outermost peripheral surface of the coil bodies 194a and 194b. Therefore, when mounting on the structure, the core diameter varies. In addition to the dimension and core position variation from the reference position and coil winding height variation, the wall surface and coil of the structure are automatically absorbed while absorbing the variation between the wall surface of the mounted structure and the outermost peripheral surface of the coil. The outermost peripheral surface can be fixed at a predetermined width.
Therefore, it is easy to assemble the apparatus, and the spacer parts can be omitted. Therefore, the number of parts, cost and weight can be further reduced.

Embodiment 10 FIG.
In this embodiment, a structure capable of absorbing variations in the coil body by being fixed by a core position fixing means that fixes the core position at a predetermined position with respect to the coil body will be described.
FIG. 14 is a front sectional view showing a transformer main body according to the tenth embodiment of the present invention. In the transformer main body described in the first to ninth embodiments, the core position is fixed at a predetermined position with respect to the coil body. It is a figure fixed by the core position fixing means.
In this embodiment, reference numerals 214a and 214b denote coil bodies, respectively. Reference numerals 217a and 217b denote bobbins surrounding the outer periphery of the core.
The coil bodies 214a and 214b are configured by winding a conductor around bobbins 217a and 217b.
Reference numerals 218a and 218b denote plates, and F denotes a protrusion provided on the bobbins 217a and 217b.
The plates 218a and 218b are composed of a member G fixed by the protrusion F of the coil bodies 214a and 214b, a member H around the U core 211, and a spring portion J.
Reference numeral 220 denotes a center line of the transformer body.

FIG. 14 shows a state in which the center of the U core 211 and the plates 218 a and 218 b is aligned with the scroll center line 220.
In the configuration of FIG. 14, as shown in FIG. 14, the positions of the coil bodies 214a and 214b are fixed to the plates 218a and 218b, and the U core 211 is in the direction of the center line 220 of the transformer body by the spring portion J of the plates 218a and 218b. The position is determined and fixed by being pressed.
For this reason, the positions of the coil bodies 214a and 214b and the U core 211 are fixed at the center of the transformer body.
With this configuration, the core that floats within the range of the inner diameter width of the coil body can be fixed at a predetermined position.

  In each of the above embodiments, the case of a transformer as a stationary inductor has been described. However, the present invention may be a reactor that is a stationary inductor.

In addition, in each embodiment, for a coil body in which only a conductor is wound, even if the coil body has a conductor wound around a bobbin, the inner dimension in the above embodiment is only the inner dimension of the bobbin. Therefore, the same effect can be obtained.
In addition, with respect to a coil body in which a conductor is wound around a bobbin, even if the coil body is formed by winding only a conductor, the inner dimension of the coil body becomes the inner dimension of the conductor, and the same effect can be obtained.

  11 E core, 11a E core upper part, 11b E core lower part, 41 U core, 41a U core upper part, 41b U core lower part, 12, 42, 72, 92, 112, 132, 152, 172, 192 Dimensions between legs, 13, 43, 73, 93, 113, 133, 153, 173, 193 Leg width, 14, 44a, 44b, 74a, 74b, 94a, 94b, 114a, 114b, 134a, 134b, 154a, 154b, 174a, 174b, 194a, 194b, 214a, 214b Coil body, 15, 45a, 45b, 75a, 75b, 95a, 95b, 115a, 115b, 135a, 135b, 155a, 155b, 175a, 175b, 195a, 195b Coil body inner dimensions, 21, 51, 81 Reference plane, 22a, 52b Maximum dimension, 22b 52a Minimum size, 32, 62, 82 Size, 76, 96, 116, 136, 156, 176, 196 Conductor winding height, 117a, 117b, 157a, 157b, 197a, 197b, 217a, 217b Bobbin, 118a, 118b , 218a, 218b Plate, 137 Holder, 138 Adhesive, 139 Spring, 141, 161, 181, 201 Wall surface, 102, 122, 142, 162, 182, 202 Variation size, 177a, 177b, 198 Spacer, 179 Spring, 220 Center line, E Distance between wall surface and transformer body.

A stationary inductor according to the present invention includes a stationary body including an inductor body having a core that forms a closed magnetic circuit, and a coil body in which a conductor is wound directly or via a bobbin on a leg portion of the core. An inductor,
The inner dimension of the coil body is not less than a value obtained by adding at least a variation dimension between adjacent leg parts to the radial dimension of the leg part .

According to the static inductor according to the present invention, the inner dimension of the coil body is equal to or greater than the radial dimension of the leg portion plus at least the variation dimension between adjacent leg portions . The relative position can be changed.
Therefore, by changing this relative position, the variation in the distance between the coil body and the wall surface of the structure on which the inductor body is mounted is absorbed and a constant value is secured. It is also possible to make the thermal resistance between the two constant.
Therefore, it is possible to obtain a stationary inductor that can suppress variations in heat dissipation performance and can withstand downsizing.

With this configuration, the positions of the coil bodies 44a and 44b are such that, even if the inter-leg dimension 42 has a variation (A ± a) [mm], the outer peripheral surface of the coil bodies 44a and 44b from the reference surface 51. The dimensions up to can be made constant.
Therefore, even if there are two or more coil bodies, the variation in the dimension 42 between the leg portions can be absorbed by increasing the coil body inner dimensions 45a and 45b of the coil bodies 44a and 44b. It is possible to obtain a transformer in which the distance between the wall surface of the case, which is a structure to be mounted, and the outer peripheral surfaces of the coil bodies 44a and 44b, that is, the filler thickness can be made constant.
Moreover, since the variation in the dimension 42 between the leg portions is absorbed by the coil body inner dimensions 45a and 45b of the coil bodies 44a and 44b, the degree of freedom in design when the transformer body is incorporated in the case is improved.
Furthermore, the transformer of this embodiment does not exceed the original maximum outer shape of the U core 41, and is the same size as the conventional one, and does not bother to increase in size.

Claims (10)

A stationary inductor comprising an inductor body having a core forming a closed magnetic circuit and a coil body formed by winding a conductor directly or via a bobbin on a leg of the core,
A stationary inductor in which the inner dimension of the coil body is equal to or greater than the radial dimension of the leg part plus at least the shape variation dimension of the leg part in the radial direction.   The stationary inductor according to claim 1, wherein the inner dimension of the coil body is a value obtained by adding a variation dimension of a conductor winding height in a radial direction of the coil body.   The inner dimension of the coil body is a value obtained by adding a variation dimension between the mounting positions to which a variation dimension of a distance between the inductor body and a wall surface of a structure on which the inductor body is mounted is added. The stationary inductor according to claim 1 or 2.   The stationary inductor according to any one of claims 1 to 3, further comprising coil body position fixing means for positioning and fixing the coil body with respect to a wall surface of a structure on which the inductor body is mounted. .   The stationary inductor according to claim 4, wherein the coil body position fixing means includes the bobbin and a plate that is fixed to both sides of the bobbin and has a width that is equal to the width between the wall surfaces.   The coil body position fixing means has a width dimension equal to the width between the wall surfaces, a holder that houses the coil body, a spring that biases the coil body against an inner wall surface of the holder, and the coil body The stationary inductor according to claim 4, further comprising an adhesive that is fixed to the leg portion of the core.   The coil body position fixing means includes a groove formed in one of the bobbin and the structure, and a protrusion formed in the other of the bobbin and the structure and inserted into the groove. Item 5. The stationary inductor according to item 4.   The coil body position fixing means includes a spacer interposed between the wall surface and the coil body, and a spring for biasing the coil body against the wall surface via the spacer. The described static inductor.   The coil body position fixing means includes a spacer having a protruding portion interposed between the wall surface and the coil body, and a groove formed in the structure into which the protruding portion is inserted. 4. The static inductor according to 4.   Furthermore, the static induction device of any one of Claims 1-9 provided with the core position fixing means which positions and fixes the said core with respect to the said coil body.

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