WO2018099137A1

WO2018099137A1 - Magnetic core assembly of transformer, transformer and electrical apparatus

Info

Publication number: WO2018099137A1
Application number: PCT/CN2017/097408
Authority: WO
Inventors: 覃承勇; 黎青海; 郑年重; 艾军亮
Original assignee: 广东美的厨房电器制造有限公司; 美的集团股份有限公司
Priority date: 2016-11-30
Filing date: 2017-08-14
Publication date: 2018-06-07
Also published as: CN106409479A

Abstract

Disclosed in the present invention are a magnetic core assembly (100) of a transformer, a transformer and an electrical apparatus. The magnetic core assembly (100) comprises a first magnetic core (102) and a second magnetic core (104). The first magnetic core (102) comprises a first column (106). The first column (106) comprises a first end face (108). The second magnetic core (104) comprises a second end face (110). The first end face (108) and the second end face (110) are oppositely arranged at intervals. At least two unequal distances are formed between the first end face (108) and the second end face (110).

Description

Magnetic core assembly of transformer and transformer and electrical equipment

Priority information

Priority is claimed on Japanese Patent Application No. 201611087562.X filed on Nov. 30, 2016, the disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of transformer technology, and more particularly to a core assembly of a transformer and a transformer and a consumer.

Background technique

In the related art, transformers are widely used in electric equipment, such as inverter microwave ovens, step-up transformers used in inverters in inverter microwave ovens, mainly by a bobbin, a primary coil and a secondary coil wound on a bobbin, and an insertion. The skeleton is composed of two magnetic cores arranged in pairs. Generally, a certain air gap is left at the junction of the two cores to ensure that the core of the step-up transformer does not saturate when operating at high power.

However, in practical applications, due to the excessive gap distance, a large range of scattered magnetic flux is radiated around the gap, and the winding near the gap generates heat due to the eddy current generated by the magnetic flux. In order to avoid excessive winding temperature, It is necessary to move the winding away from the gap position, so it is necessary to increase the length of each winding. When the number of winding turns is constant, the total length of the winding is inevitably increased, that is, the cost is increased, and the copper loss is also increased. In addition, excessive magnetic flux generated by the magnetic flux can interfere with the normal operation of other electronic devices.

Therefore, how to ensure that the magnetic core is not saturated when the transformer is working at maximum power, avoiding the excessive flux range of the flux at the gap becomes a technical problem to be solved.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, embodiments of the present invention are required to provide a magnetic core assembly of a transformer and a transformer and a power device.

A magnetic core assembly of a transformer according to an embodiment of the present invention includes a first magnetic core and a second magnetic core, the first magnetic core including a first post, the first post including a first end face, and the second magnetic core includes a first The two end faces are disposed opposite to the second end face, and at least two unequal distances are formed between the first end face and the second end face.

In the magnetic core assembly of the above transformer, since at least two unequal distances are formed between the first end surface and the second end surface, the first end surface has a portion where the reluctance is unequal and/or the second end surface has a reluctance In the part, when the transformer is working, the magnetic flux always flows along the place where the magnetic reluctance is small, thereby effectively reducing the scattered magnetic flux radiated to the surroundings, thereby reducing the eddy current loss caused by the loose magnetic flux of the winding. The temperature rise, at the same time, weakens the magnetic field radiation of the flux flux and reduces interference with surrounding electronics.

In some embodiments, the second magnetic core includes a second post, the second post including the second end face.

In some embodiments, the first end surface includes a first portion that protrudes toward the second end surface, and/or the second end surface includes a second portion that protrudes toward the first end surface.

In some embodiments, the first post includes a columnar portion and a convex portion, the convex portion is connected to one end of the columnar portion, the columnar portion is a cylindrical portion, and the convex portion is a circular table connecting the cylindrical portion, the first portion The portion is the surface of the truncated cone, and the truncated cone is tapered away from the cylindrical portion.

In some embodiments, the height of the truncated cone is 1/3 of the total gap length between the end plane of the columnar portion and the second end surface, and the top surface area of the truncated cone is the area of the end plane of the columnar portion. 1/3.

In some embodiments, the second post includes a columnar portion and a protrusion, the protrusion being attached to the column At one end of the portion, the columnar portion is a cylindrical portion, and the convex portion is a circular table connecting the cylindrical portion, and the second portion is a surface of the circular table, and the circular table is tapered in a direction away from the cylindrical portion.

In some embodiments, the height of the truncated cone is 1/3 of the total gap length between the end plane of the columnar portion and the first end surface, and the top surface area of the truncated cone is the area of the end plane of the columnar portion. 1/3.

In some embodiments, the first end surface includes a third portion that is recessed away from the second end surface, and/or the second end surface includes a fourth portion that is recessed away from the first end surface.

In some embodiments, the first post includes a cylindrical portion that is a grooved surface that is open at one end of the cylindrical portion.

In some embodiments, the second post includes a cylindrical portion that is a grooved surface that is open at one end of the cylindrical portion.

In some embodiments, a side edge of the first end surface is higher than a center of the first end surface to form the third portion, and/or a side edge of the second end surface is higher than a center of the second end surface Formed to form the fourth portion.

In some embodiments, the first end surface and the second end surface are two planes that are not parallel to each other.

In some embodiments, the first magnetic core and the second magnetic core are both U-shaped, or the first magnetic core and the second magnetic core are both E-shaped, or the first magnetic core and the second magnetic core The magnetic cores are all PQ type; or the first magnetic core is E-shaped and the second magnetic core is I-shaped.

In some embodiments, the magnetic core assembly includes a bobbin and a bobbin, the bobbin is disposed on the bobbin, the first post passes through the bobbin, and the second post passes through the bobbin and Opposite the first post in the bobbin.

In some embodiments, the bobbin includes a first bobbin and a second bobbin, the outer side of the first post is sleeved with the first bobbin, and the outer side of the second post is sleeved with the Second bobbin.

A transformer according to an embodiment of the present invention includes the magnetic core assembly of any of the embodiments.

An electric device according to an embodiment of the present invention includes the above-described transformer.

In the above transformer and the electric device, since at least two unequal distances are formed between the first end surface and the second end surface, the first end surface has a portion where the magnetic resistance is not equal and/or the magnetic resistance is different at the second end surface. In the part, when the transformer is working, the magnetic flux always flows along the place where the magnetic reluctance is small, thereby effectively reducing the scattered magnetic flux radiated to the surroundings, thereby reducing the eddy current loss caused by the loose magnetic flux of the winding. The temperature rise, at the same time, weakens the magnetic field radiation of the flux flux and reduces interference with surrounding electronics.

Additional aspects and advantages of the embodiments of the invention will be set forth in part in the description.

DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from

1 is a schematic perspective view of a magnetic component according to an embodiment of the present invention.

2 is an exploded perspective view of a magnetic component in accordance with an embodiment of the present invention.

3 is a schematic view showing the structure of an end surface of a magnetic component according to an embodiment of the present invention.

4 is a schematic view showing another structure of an end surface of a magnetic component according to an embodiment of the present invention.

Fig. 5 is a schematic view showing still another configuration of an end surface of a magnetic component according to an embodiment of the present invention.

6 is a perspective view of two magnetic cores of a magnetic component according to an embodiment of the present invention.

7 is a perspective view of a first magnetic core of a magnetic component according to an embodiment of the present invention.

8 is a perspective view of a second magnetic core of a magnetic component according to an embodiment of the present invention.

Fig. 9 is a schematic view showing still another structure of an end surface of a magnetic component according to an embodiment of the present invention.

Fig. 10 is a still further schematic structural view showing an end face of a magnetic component according to an embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the accompanying drawings, in which the same or the Functional components. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include one or more of the described features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected, or may be electrically connected or may communicate with each other; may be directly connected or indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. In addition, the present invention may be repeated with reference to the numerals and/or reference numerals in the various examples, which are for the purpose of simplification and clarity, and do not indicate the relationship between the various embodiments and/or settings discussed. Moreover, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the use of other processes and/or the use of other materials.

Referring to FIG. 1 to FIG. 2, a magnetic core assembly 100 of a transformer according to an embodiment of the present invention includes a first magnetic core 102 and a second magnetic core 104. The first magnetic core 102 includes a first pillar 106. The column 106 includes a first end surface 108, and the second core 104 includes a second end surface 110. The first end surface 108 is spaced apart from the second end surface 110. The first end surface 108 and the second end surface 110 form at least two. An unequal distance.

In the core assembly 100 of the above transformer, due to the relationship between the first end face 108 and the second end face 110 Forming at least two unequal distances such that the first end face 108 has a portion where the reluctance is unequal and/or the second end face 110 has a portion where the reluctance is unequal. When the transformer is in operation, the magnetic flux always follows the reluctance. Smaller flow, which effectively reduces the flux leakage to the surrounding radiation, thus reducing the temperature rise caused by the eddy current loss caused by the flux leakage, and at the same time weakening the magnetic field radiation of the magnetic flux, reducing Interference with surrounding electronics.

Specifically, in the embodiment, the outer side of the first column 106 is sleeved with a first bobbin (not shown), and the first bobbin is used for winding a coil, such as a primary coil or a secondary coil. The first bobbin is disposed on the bobbin 111.

The formation of at least two unequal distances between the first end surface 108 and the second end surface 110 is understood to mean that, in one example, the first end surface 108 is planar and the second end surface 110 includes a convex surface, a convex concave surface and a concave surface. One or any combination, or the second end surface 110 includes a plane and at least one of the following surfaces: a convex surface, a convex concave surface, and a concave surface such that at least two unequalities are formed between the first end surface 108 and the second end surface 110 distance. FIG. 3 shows one of the above various cases. The first end surface 108 is a flat surface, the second end surface 110 is a convex surface, and at least two unequal distances L1 and L2 are formed between the first end surface 108 and the second end surface 110. That is, the first distance L1 is smaller than the second distance L2.

In another example, the second end face 110 is planar, and the first end face 108 includes one or any combination of a convex surface, a convex concave surface, and a concave surface, or the first end surface 108 includes a flat surface and at least one of the following surfaces: The convex surface, the convex concave surface and the concave surface form at least two unequal distances between the first end surface 108 and the second end surface 110. Figure 4 shows one of the various cases described above, with the first end face 108 being a convex surface and the second end face 110 being a flat surface.

In still another example, the first end face 108 includes one or any combination of a convex surface, a convex concave surface, and a concave surface, or the first end surface 108 includes a plane and at least one of the following surfaces: a convex surface, a convex concave surface, and a concave surface, and The second end surface 110 includes one or any combination of a convex surface, a convex concave surface, and a concave surface, or the second end surface 110 includes a plane and at least one of the following surfaces: a convex surface, a convex concave surface, and a concave surface, such that the first end surface 108 and Forming at least two unequalities between the second end faces 110 distance. Fig. 5 shows one of the above various cases, the first end face 108 being a convex surface and the second end face 110 being a convex surface.

In some embodiments, the second core 104 includes a second post 112 that includes the second end face 110.

As such, the transformer facilitates the passage of magnetic flux between the first post 106 and the second post 112.

Specifically, in the embodiment, the outer side of the second column 112 is sleeved with a second bobbin 113, and the second bobbin 113 is used for winding a coil, such as a primary coil or a secondary coil, if the first bobbin Around the primary coil, the second bobbin 113 is wound around the secondary coil and vice versa. In the example of the present invention, the first bobbin and the second bobbin 113 are connected in a bobbin 114, and the bobbin 114 is disposed on the bobbin 111, which simplifies the structure of the magnetic assembly 100.

In some embodiments, referring to FIG. 6, FIG. 7, and FIG. 8, the first end surface 108 includes a first portion 116 that protrudes toward the second end surface 110, and/or

The second end surface 110 includes a second portion that protrudes toward the first end surface 108.

Thus, at least two unequal distances are formed between the first end surface 108 and the second end surface 110.

Specifically, in the embodiment of the present invention, the first end surface 108 may include a first portion 116 protruding toward the second end surface 110, or the second end surface 110 may be adjacent to the first end surface 108. a second portion protruding in a direction; or the first end surface 108 includes a first portion 116 protruding toward the second end surface 110, and the second end surface 110 includes a direction toward the first end surface 108 The second part of the bulge.

In the example shown in FIGS. 7 and 8, the first end face 108 includes a first portion 116 that projects toward the second end face 110, and the second end face 110 is a flat surface. The first column 106 includes a columnar portion 118 and a convex portion 120. The convex portion 120 is connected to one end of the columnar portion 118. The columnar portion 118 is, for example, a cylindrical portion. The convex portion 120 is a circular table connecting the cylindrical portions, and the first portion 116 is a surface of the circular table. The truncated cone is tapered away from the columnar portion 118.

Preferably, the height of the truncated cone is between the end plane 119 and the second end surface 110 of the columnar portion 118. The total gap length is 1/3 of the length L. The top surface area of the truncated cone is 1/3 of the area of the end plane 119 of the columnar portion 118. In this example, the area of the bottom surface of the truncated cone is equal to the area of the end plane 119 of the columnar portion. Of course, in other embodiments, the height, top surface area, and bottom surface area of the truncated cone may be appropriately adjusted according to actual conditions.

It should be noted that in other examples, the second portion may also be set by referring to the above description of the first portion.

In other examples, the first portion 116 may also be a hemispherical surface, a pointed surface, an elongated convex surface, or the like, as long as the first end surface 108 is convex, that is, the first end surface 108 is higher than a certain position. The other position of the first end face 108 is a convex portion.

In some embodiments, referring to FIG. 9 , the first end surface 108 includes a third portion 122 that is recessed away from the second end surface 110 , and/or

The second end surface 110 includes a fourth portion that is recessed away from the first end surface 108.

Specifically, in the embodiment of the present invention, the first end surface 108 includes a third portion 122 that is recessed away from the second end surface 110, and the second end surface 110 includes a direction away from the first end surface 108. a fourth portion of the recess; the first end surface 108 includes a third portion 122 that is recessed away from the second end surface 110, or the second end surface 110 includes a recess that is recessed away from the first end surface 108. The fourth part.

Specifically, in an example, referring to FIG. 9 , the first post 106 includes a columnar portion 124 , and the third portion 122 is a groove surface opened at one end of the columnar portion 124 . The columnar portion 124 is, for example, a cylindrical portion, and the third portion 122 is a truncated grooved surface that is concave toward the cylindrical portion.

It should be noted that in other examples, the fourth portion can also be set by referring to the above description of the third portion.

In some embodiments, the side edge of the first end surface 108 is higher than the center of the first end surface 108 to form the third portion 122, and/or the side edge of the second end surface 110 is higher than the first portion The center of the two end faces 110 is formed to form the fourth portion.

Thus, the formation of the third portion 122 and the fourth portion is relatively simple.

Specifically, in one example, the third portion 122 is a single concave surface and the fourth portion can be another single concave surface.

In some embodiments, referring to FIG. 10, the first end surface 108 and the second end surface 110 are two planes that are not parallel to each other.

Specifically, in the example shown in FIG. 10, when the magnetic core assembly 100 is applied to an electric device, the first end surface 108 is a first plane perpendicular to a horizontal plane, and the second end surface 110 is a second plane at an acute angle to a horizontal plane. .

In some embodiments, the first magnetic core 102 and the second magnetic core 104 are both U-shaped, or the first magnetic core 102 and the second magnetic core 104 are both E-shaped, or the first magnetic core Both the 102 and the second core 104 are PQ-type; or the first core 102 is E-shaped and the second core 104 is I-shaped.

As such, the magnetic core assembly 100 has a wide range of applications.

Specifically, in the example of the present invention, the first core 102 and the second core 104 are both U-shaped.

Referring to FIGS. 7 and 8, the first magnetic core 102 includes a first connecting post 126 and two first posts 106. The two first posts 106 are coupled to both ends of the first connecting post 126. The second core 104 includes a second connecting post 128 and two second posts 112 connected to both ends of the second connecting post 128. The length of the first post 106 is greater than the length of the second post 112.

In the example of the present invention, the columnar portion 118 of one of the first columns 106 has a rectangular parallelepiped shape, and the columnar portion 118 of the other first column 106 has a cylindrical shape. The two first end faces 108 each include a protrusion toward the second end face 110. First portion 116. Correspondingly, one of the second columns 112 has a rectangular parallelepiped shape, and the other second column 112 has a cylindrical shape, and the two second end faces 110 are all planar.

The convex portion on the cylindrical shape has a truncated cone shape, and the convex portion on the rectangular parallelepiped shape has a quadrangular prism shape.

It should be noted that other shapes of magnetic cores can be implemented with reference to the U-shaped magnetic core, and will not be developed in detail here.

A transformer according to an embodiment of the present invention includes the magnetic core assembly 100 of any of the above embodiments.

In the embodiment of the present invention, the first core 102 and the second core 104 are both U-shaped, one of the first pillars 106 of the first core 102 is disposed through the bobbin 114, and the other first pillar 106 is located Outside the wire barrel 114.

One of the second posts 112 of the second core 104 passes through the bobbin 114 and is spaced apart from the first post 106 in the bobbin 114, and the other second post 112 is located outside the bobbin 114 and with the bobbin The first columns 106 outside 114 are spaced apart.

An electric device according to an embodiment of the present invention includes the transformer of the above embodiment.

In the above transformer and the electric device, since at least two unequal distances are formed between the first end surface 108 and the second end surface 110, the first end surface 108 has a portion where the reluctance is not equal and/or the second end surface 110 exists. Where the reluctance is not the same, when the transformer is working, the magnetic flux always flows along the place where the magnetic reluctance is small, thereby effectively reducing the scattered magnetic flux radiated to the surroundings, thereby reducing the occurrence of the winding due to the scattered magnetic flux. The temperature rise caused by the eddy current loss, at the same time, weakens the magnetic field radiation of the scattered magnetic flux and reduces the interference to surrounding electronic devices.

Specifically, the electric device is, for example, a home appliance such as a variable frequency microwave oven.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples", etc. The specific features, structures, materials or characteristics described in the embodiments or examples are included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms does not necessarily mean the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the present invention In the description, "a plurality" means at least two, such as two, three, etc., unless specifically defined otherwise.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A magnetic core assembly for a transformer, comprising: a first magnetic core and a second magnetic core, the first magnetic core comprising a first post, the first post comprising a first end face, the second magnetic core comprising a second The first end surface is spaced apart from the second end surface, and at least two unequal distances are formed between the first end surface and the second end surface.
A magnetic core assembly for a transformer according to claim 1, wherein the second magnetic core comprises a second post, the second post comprising the second end face.
A magnetic core assembly for a transformer according to claim 2, wherein the first end surface includes a first portion that protrudes toward the second end surface, and/or

The second end surface includes a second portion that protrudes toward the first end surface.
The magnetic core assembly of a transformer according to claim 3, wherein the first post comprises a columnar portion and a convex portion, the convex portion being connected to one end of the columnar portion, the columnar portion being a cylindrical portion, the convex portion being A circular table connecting the cylindrical portion, the first portion being a surface of the circular table, the circular table being tapered away from the cylindrical portion.
A magnetic core assembly for a transformer according to claim 4, wherein a height of the circular table is 1/3 of a total gap length between an end plane of the columnar portion and the second end surface, and a top surface area of the circular table It is 1/3 of the area of the end plane of the columnar portion.
The magnetic core assembly of a transformer according to claim 3, wherein the second post comprises a columnar portion and a convex portion, the convex portion being connected to one end of the columnar portion, the columnar portion being a cylindrical portion, the convex portion being A circular table connecting the cylindrical portion, the second portion being a surface of the circular table, the circular table being tapered away from the cylindrical portion.
A magnetic core assembly for a transformer according to claim 6, wherein a height of the circular table is 1/3 of a total gap length between an end plane of the columnar portion and the first end surface, and a top surface area of the circular table It is 1/3 of the area of the end plane of the columnar portion.
The magnetic core assembly of a transformer according to claim 2, wherein the first end surface includes a third portion recessed away from the second end surface, and/or

The second end surface includes a fourth portion that is recessed away from the first end surface.
A magnetic core assembly for a transformer according to claim 8, wherein the first post comprises a cylindrical portion, and the third portion is a groove surface opened at one end of the cylindrical portion.
A magnetic core assembly for a transformer according to claim 8, wherein the second post comprises a cylindrical portion, and the fourth portion is a groove surface opened at one end of the cylindrical portion.
The magnetic core assembly of a transformer according to claim 8, wherein a side edge of the first end surface is higher than a center of the first end surface to form the third portion, and/or

The side edge of the second end surface is higher than the center of the second end surface to form the fourth portion.
A magnetic core assembly for a transformer according to claim 1 or 2, wherein the first end surface and the second end surface are two planes which are not parallel to each other.
The magnetic core assembly of a transformer according to claim 2, wherein the first magnetic core and the second magnetic core are both U-shaped, or the first magnetic core and the second magnetic core are both E-shaped. Or the first magnetic core and the second magnetic core are both PQ-type; or the first magnetic core is E-shaped and the second magnetic core is I-shaped.
The magnetic core assembly of a transformer according to claim 2, wherein the magnetic core assembly comprises a bobbin and a bobbin, the bobbin is disposed on the bobbin, and the first post passes through the bobbin, A second post is threaded through the bobbin and spaced apart from the first post in the bobbin.
The core assembly of a transformer according to claim 14, wherein the bobbin includes a first bobbin and a second bobbin, and the first bobbin is sleeved on an outer side of the first post. The second bobbin is sleeved on the outer side of the second column.
A transformer comprising the magnetic core assembly of any of claims 1-15.
An electric device comprising the transformer of claim 16.