JP2023019156A - Transformer - Google Patents

Abstract

To improve vibration resistance while suppressing enlargement of a transformer.SOLUTION: An inner core 16 is made of a material containing a magnetic material, and includes a first flange portion 161, a second flange portion 162, and a core portion 163. The core portion 163 extends vertically between the first flange portion 161 and the second flange portion 162. A conductive wire 17 is wound around the core portion 163. An outer core 15 is made of a material containing a magnetic material, and includes a peripheral wall 151 that surrounds at least a portion of the first flange portion 161 and the core portion 163 in the left-right direction. The inner core 16 is a one-piece component. The second flange portion 162 has a portion facing the peripheral wall 151 in the vertical direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to transformers.

US Pat. No. 5,300,008 discloses a transformer with a first core, a second core and conductive lines. The first core has a first collar, a second collar, and a core extending in the first direction between the first collar and the second collar. The conductive wire is wound around the core. The second core has a wall portion that surrounds at least a portion of the first collar portion and the core portion in a second direction that intersects the first direction. The first core and the second core are made of a material containing a magnetic substance.

JP 2008-004905 A

An object of the present invention is to improve vibration resistance while suppressing an increase in size of the transformer.

One aspect of the present invention that can be provided to achieve the above object is trans,
A first collar portion, a second collar portion, and a core portion extending in the first direction between the first collar portion and the second collar portion, and formed of a material containing a magnetic substance. a core;
a conductive wire wound around the core;
a second core having a wall portion that surrounds at least a portion of the first collar portion and the core portion from a second direction that intersects with the first direction, and that is formed of a material containing a magnetic material;
and
the first core is a one-piece part,
Said 2nd collar part has a part which opposes said wall part about said 1st direction.

According to the configuration as described above, it is possible to form a structure capable of suppressing leakage of the magnetic flux generated from the coil to the outside by the second flange portion of the first core and the wall portion of the second core. A decrease in inductance can be suppressed by suppressing the leakage of the magnetic flux to the outside. Since it is not necessary to take measures to increase the number of turns of the conductive wire in anticipation of the decrease in inductance, it is possible to suppress an increase in the size of the transformer.

In addition, since the second collar part, which is a part of the one-piece first core, has realized a structure that can suppress the leakage of magnetic flux to the outside, there is no need to prepare a separate member dedicated to suppressing leakage. . As a result, it is possible to further suppress the size increase of the transformer, reduce the number of parts, and reduce the manufacturing man-hours, as well as increase the strength of the structure against the influence of vibrations applied from the outside.

As a result, vibration resistance can be improved while suppressing an increase in size of the transformer.

1 illustrates an appearance of a transformer according to one embodiment. 1 illustrates an appearance of a transformer according to one embodiment. The appearance of the transformer with the outer shield case removed is illustrated. The appearance of the transformer with the inner shield case removed is illustrated. 4 illustrates the appearance of the transformer with the outer core removed. 4 illustrates the appearance of the transformer as viewed from above. FIG. 7 illustrates a cross-section of the transformer viewed in the direction of the arrow along line VII-VII in FIG. 6; FIG. 7 illustrates a cross-section of the transformer viewed in the direction of the arrows along line VIII--VIII in FIG. 6; 4 shows another example of the configuration of the inner core. 1 is a perspective view illustrating a design of a transformer according to one embodiment; FIG. FIG. 11 is a front view illustrating the design of the transformer of FIG. 10; FIG. 11 is a rear view illustrating the design of the transformer of FIG. 10; FIG. 11 is a plan view illustrating the design of the transformer of FIG. 10; FIG. 11 is a bottom view illustrating the design of the transformer of FIG. 10; FIG. 11 is a left side view illustrating the design of the transformer of FIG. 10; FIG. 11 is a right side view illustrating the design of the transformer of FIG. 10;

Exemplary embodiments are described in detail below with reference to the accompanying drawings. In the accompanying drawings, arrow F indicates the forward direction of the illustrated structure. Arrow B indicates the rearward direction of the illustrated structure. Arrow U indicates the upward direction of the illustrated structure. Arrow D indicates the downward direction of the illustrated structure. Arrow R indicates the right direction of the illustrated structure. Arrow L indicates the left direction of the illustrated structure. These directional expressions are used for convenience of explanation and do not limit the attitudes and directions of the illustrated structures in actual use.

As used herein, the term "front-to-back" refers to directions along the forward and rearward directions described above. As used herein, the term "vertical" refers to directions along the upward and downward directions. As used herein, the term "lateral" refers to directions along the left and right directions described above.

The expression "extending in the front-rear direction" used in this specification includes extending at an angle with respect to the front-rear direction, and means extending at an inclination closer to the front-rear direction than in the up-down direction and the left-right direction.

The expression "vertically extending" used in this specification includes extending with an inclination with respect to the vertical direction, and means extending at an inclination closer to the vertical direction than in the front-rear direction and the horizontal direction.

The expression "extending in the horizontal direction" used in this specification includes extending with an inclination with respect to the horizontal direction, and means extending with an inclination closer to the horizontal direction than in the front-rear direction and the vertical direction.

FIG. 1 illustrates an appearance of a transformer 10 according to one embodiment viewed from the upper left rear direction. FIG. 2 illustrates the appearance of the transformer 10 viewed from the lower left front direction. The transformer 10 has an outer shield case 11 , a base 12 and a plurality of terminals 13 .

The outer shield case 11 is made of a conductive material. The base 12 is made of an electrically insulating material. Each of the plurality of terminals 13 is made of a conductive material.

FIG. 3 illustrates the appearance of the transformer 10 with the outer shield case 11 removed. The transformer 10 has an inner shield case 14 .

The inner shield case 14 has a fitting hole 141 . The outer shield case 11 is fixed to the inner shield case 14 by fitting projections (not shown) formed on the inner wall surface of the outer shield case 11 into the fitting holes 141 .

As illustrated in FIGS. 2 and 3, the inner shield case 14 has a pair of engaging pieces 142 . The inner shield case 14 is fixed to the base 12 by engaging the pair of engaging pieces 142 with the base 12 .

FIG. 4 illustrates the appearance of the transformer 10 with the inner shield case 14 removed. Transformer 10 includes an outer core 15 . The outer core 15 is made of a material containing a magnetic substance.

FIG. 5 illustrates the appearance of the transformer 10 with the outer core 15 removed. Transformer 10 includes an inner core 16 . The inner core 16 is made of a material containing a magnetic substance.

The inner core 16 has a first flange portion 161 , a second flange portion 162 and a core portion 163 . The core portion 163 extends vertically between the first flange portion 161 and the second flange portion 162 . The inner core 16 is an example of a first core. The vertical direction is an example of the first direction.

Inner core 16 is a one-piece component. As used herein, the term "one-piece part" means a part of monolithic construction. The term "one-piece part" is used to distinguish from parts that are integrated by joining multiple parts by various techniques. Examples of various techniques include adhesion, bonding, welding, welding, engagement, fitting, and screwing.

FIG. 6 illustrates an appearance of the transformer 10 viewed from above. FIG. 7 illustrates a cross-section of the transformer 10 viewed in the direction of the arrows along line VII--VII in FIG. FIG. 8 illustrates a cross section of the transformer 10 viewed in the direction of the arrow along line VIII--VIII in FIG. Although not shown in FIG. 5, a coil is formed by winding the conductive wire 17 around the core portion 163 .

The outer core 15 has a peripheral wall 151 . The peripheral wall 151 surrounds the first flange portion 161 and the core portion 163 of the inner core 16 in the front-back direction and the left-right direction. The outer core 15 is an example of a second core. Each of the front-rear direction and the left-right direction is an example of the second direction. The peripheral wall 151 is an example of a wall.

The outer core 15 has a ceiling wall 152 . The ceiling wall 152 has a portion vertically facing the first brim portion 161 of the inner core 16 . The ceiling wall 152 continues to the upper end of the peripheral wall 151 . As a result, the outer core 15 closes the inner core 16 above.

As illustrated in FIG. 7 , the maximum dimension in the left-right direction of the second collar portion 162 is larger than the maximum dimension in the left-right direction of the first collar portion 161 . Thereby, the second collar portion 162 has a portion facing the lower end of the peripheral wall 151 of the outer core 15 in the vertical direction.

According to such a configuration, the peripheral wall of the outer core 15 and the second flange portion 162 of the inner core 16 can form a structure capable of suppressing leakage of magnetic flux generated from the coil to the outside. A decrease in inductance can be suppressed by suppressing the leakage of the magnetic flux to the outside. Since a countermeasure for increasing the number of turns of the conductive wire 17 in anticipation of a decrease in inductance can be eliminated, an increase in size of the transformer 10 can be suppressed.

In addition, since the second collar portion 162, which is a part of the inner core 16, which is a one-piece component, has a structure capable of suppressing leakage of magnetic flux to the outside, it is necessary to prepare a separate member dedicated to suppressing leakage. do not have. As a result, it is possible to further suppress the size increase of the transformer 10, reduce the number of parts, and reduce the manufacturing man-hours, as well as increase the strength of the structure against the influence of vibrations applied from the outside.

As a result, vibration resistance can be improved while suppressing an increase in size of the transformer 10 .

As illustrated in FIG. 4 , a thread groove 153 is formed on the outer surface of the peripheral wall 151 of the outer core 15 . A cross groove 154 is formed on the upper surface of the ceiling wall 152 of the outer core 15 .

On the other hand, as illustrated in FIG. 8, a thread groove 143 is formed in part of the inner surface of the inner shield case 14 . The thread groove 143 is screwed with the thread groove 153 of the outer core 15 . As a result, the outer core 15 is supported by the inner shield case 14 so as to be rotatable about the core portion 163 of the inner core 16 .

An opening 144 is formed in the upper portion of the inner shield case 14 . An opening 111 is formed in the upper portion of the outer shield case 11 . 1 and 6, the cross groove 154 of the outer core 15 is exposed to the outside through the opening 144 and the opening 111. As shown in FIGS.

By rotating the outer core 15 by engaging a jig such as a Phillips screwdriver in the cross groove 154, the outer core 15 is vertically displaced. By changing the position of the outer core 15 with respect to the inner core 16, the inductance value can be adjusted.

In such a configuration, a situation arises in which a portion of the core portion 163 of the inner core 16 is not surrounded by the peripheral wall 151 of the outer core 15 . In other words, a situation arises in which the magnetic flux generated from the coil tends to leak to the outside. However, since the second flange portion 162 extends to the position facing the lower end of the peripheral wall 151 as described above, magnetic flux leakage due to the displacement of the outer core 15 can be minimized.

As illustrated in FIG. 8 , the maximum dimension in the front-rear direction of the second collar portion 162 is equal to the maximum dimension in the front-rear direction of the first collar portion 161 . Thus, the passage 18 is formed in the transformer 10 at a position where the second flange portion 162 does not face the peripheral wall 151 of the outer core 15 .

Each of the plurality of terminals 13 is molded integrally with the base 12 . Each of the terminals 13 has a mounting terminal 131 and a coil terminal 132 .

The mounting terminals 131 are electrically connected to circuit elements formed on the circuit board when the transformer 10 is mounted on the circuit board.

An end portion 171 of the conductive wire 17 wound around the core portion 163 of the inner core 16 is electrically connected to the coil terminal 132 after being pulled out through the passage 18 . That is, a portion of the conductive line 17 extends inside the passage 18 .

According to such a configuration, it is possible to suppress a decrease in efficiency in the work of pulling out the end portion 171 of the conductive wire 17 for electrical connection with an external circuit.

FIG. 9 shows another example of the shape of the inner core 16 . In this example, the maximum dimension in the front-rear direction of the second collar portion 162 is also larger than the maximum dimension in the front-rear direction of the first collar portion 161 . That is, the second flange portion 162 has a portion facing the peripheral wall 151 of the outer core 15 in the vertical direction also in the front-rear direction.

In this case, the passage 18 for drawing out the end portion 171 of the conductive wire 17 for the purpose of electrical connection with an external circuit is formed as part of the second collar portion 162 . In this example, the passage 18 is formed by a groove formed in each of the front and rear ends of the second collar portion 162 .

The passage 18 may be formed by a through hole formed in the second collar portion 162 at a position not facing the peripheral wall 151 in the vertical direction.

According to the configuration as described above, the dimension of the second collar portion 162 is maximized while suppressing a decrease in the efficiency of the work of pulling out the end portion 171 of the conductive wire 17 for electrical connection with an external circuit. By increasing the size, the effect of suppressing the leakage of the magnetic flux generated from the coil to the outside can be enhanced.

The above embodiments are merely examples for facilitating understanding of the present invention. The configurations according to the above embodiments can be modified and improved as appropriate without departing from the scope of the present invention.

In the above embodiment, the outer core 15 is displaceable with respect to the inner core 16 . However, a configuration in which the outer core 15 is non-displaceable with respect to the inner core 16 may also be employed.

10 to 16 illustrate the design of a transformer according to one embodiment. FIG. 10 is a perspective view. FIG. 11 is a front view. FIG. 12 is a rear view. FIG. 13 is a plan view. FIG. 14 is a bottom view. FIG. 15 is a left side view. FIG. 16 is a right side view.

10: transformer, 15: outer core, 151: peripheral wall, 16: inner core, 161: first flange, 162: second flange, 163: core, 17: conductive wire, 18: passage

Claims (4)

A first collar portion, a second collar portion, and a core portion extending in the first direction between the first collar portion and the second collar portion, and formed of a material containing a magnetic substance. a core;
a conductive wire wound around the core;
a second core having a wall portion that surrounds at least a portion of the first collar portion and the core portion from a second direction that intersects with the first direction, and that is formed of a material containing a magnetic material;
and
the first core is a one-piece part,
The second collar has a portion facing the wall in the first direction,
Trance. the second core is displaceable in the first direction;
Transformer according to claim 1. The second brim section defines a passage at a position not facing the wall section in the first direction,
a portion of the conductive line extends within the passageway;
3. A transformer according to claim 1 or 2. The passage is formed as part of the second collar,
4. A transformer according to claim 3.

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