KR102693111B1 - Electromagnet unit - Google Patents

Abstract

The present invention relates to an electromagnet unit capable of changing the intensity of a magnetic field in various ways and increasing the intensity of a magnetic field. The electromagnet unit according to the present invention is characterized in that it has a housing (10) in the shape of a disk or cylinder, the housing (10) is composed of a magnetizable material, two or more annular mounting grooves (12, 13) are provided on the upper part of the housing (10), two or more annular mounting grooves (14, 15) are provided on the lower part of the housing (10), and a coil member (41, 42, 51, 52) is installed in each of the mounting grooves, and the coil member is wound with a conductor coated with an insulating material and is provided with first and second terminals for supplying a driving current to the conductor, and a first guide groove is provided on the inner wall of each of the mounting grooves for guiding the first or second terminal upward.

Description

ELECTROMAGNET UNIT

The present invention relates to an electromagnet, and more particularly, to an electromagnet unit capable of changing the intensity of a magnetic field in various ways and increasing the intensity of a magnetic field.

A device or component that exhibits magnetism according to the flow of current is called an electromagnet. Generally, an electromagnet is composed of a conductor coated with an insulating material such as enamel, wound around a bobbin. The uses of electromagnets are very diverse. Electromagnets are widely used in a wide variety of fields, such as actuators for operating various valves, lifters for lifting heavy objects containing iron, clutches or brakes for power transmission devices, and magnetic separators for separating magnetic and non-magnetic substances. As products become lighter and thinner, the demand for electromagnets that can generate strong magnetic force with a compact structure is increasing. In addition, some application fields such as magnetic separators require electromagnets that can appropriately adjust the strength of the electromagnetic force. Generally, the size of the magnetic force lines or magnetic fields of an electromagnet is proportional to the length of the coil wound and the strength of the current flowing through the coil. In the case of an electromagnet that winds a coil around a bobbin, there are limitations in improving or appropriately adjusting the performance of the electromagnet due to its structural characteristics.

Meanwhile, Korean Patent Registration No. 10-1735860 (Title: Electromagnet and Electromagnetic Coil Assembly) discloses an electromagnet configured in a flat plate shape. The electromagnet or electromagnetic coil assembly disclosed herein is configured by a structure in which a pole piece configured of a magnetizable material has an annular groove formed therein, a coil assembly is mounted therein, and an armature plate is installed on the upper side thereof. This invention generates a coupling force between the pole piece and the armature by the flow of magnetic flux passing through the pole piece and the armature, and therefore, there are limitations in the scope of its use, such as a clutch assembly for power transmission. In addition, this invention has a problem in that magnetic flux loss occurs due to a gap between the coil assembly and the pole piece.

The present invention has been created in consideration of the above circumstances, and has a technical purpose of providing an electromagnet unit that can be made lightweight, compact, and applicable to various usage environments.

In addition, the present invention has another technical purpose of providing an electromagnet unit capable of increasing the strength of a magnetic field.

In addition, another purpose of the present invention is to provide an electromagnet unit that can be used by varying the strength of a magnetic field.

According to the present invention for realizing the above object, the electromagnet unit is an electromagnet unit that generates a magnetic field according to the supply of current, and comprises a housing configured in a cylindrical shape, the housing is configured of a magnetizable material, two or more annular mounting grooves are provided on the upper part of the housing, two or more annular mounting grooves are provided on the lower part of the housing, a coil member is installed in each of the mounting grooves, and the coil member is wound with a conductor coated with an insulating material and is provided with first and second terminals for supplying a driving current to the conductor, and a first guide groove is provided on the inner wall of each of the mounting grooves for guiding the first or second terminal upward.
The above coil members (41, 42, 51, 52) are each press-fitted into the mounting grooves (12 to 15), and this is to minimize the loss of magnetic flux generated in the coil members (41, 42, 51, 52) by bringing the body (10) and the coil members (41, 42, 51, 52) into close contact.
When the width of the first and third anchoring grooves (12, 14) is W1 and the depth is D1, and the width of the second and fourth anchoring grooves (13, 15) is W2 and the depth is D2, W1 or D1 is set larger than W2 or D2.
Considering the coercive force for the magnetic flux generated from the coil member (41, 42, 51, 52), the outer wall of each fixing groove (12 to 15) is characterized by having a constant thickness.

In addition, the central portion of the housing is characterized by having a hollow portion that penetrates the housing in the vertical direction.

In addition, the upper and lower sides of the housing are additionally provided with covers, the covers are made of a material that can be magnetized, and the inner surface of the covers is provided with a second guide groove for guiding the first or second terminal toward the outside of the housing.

In addition, it is characterized in that an insulating material is provided between the housing and the cover.

In addition, it is characterized in that an insulating film is attached to the outer surface of the cover.

In addition, the above-mentioned anchoring groove is characterized in that the lower edge portion has an arc shape.

In addition, the conductor constituting the coil member is characterized by having a cross-section having a square or rectangular shape.

In addition, the coil member is characterized in that it is pressed into the mounting groove.

According to the present invention having the above-described configuration, a plurality of fixing grooves are provided on the upper and lower sides of the housing, respectively, and coil members are installed in each of these fixing grooves. The coil members are connected in series or in parallel with each other. In addition, the coil members can be individually driven. Therefore, the intensity of the magnetic field generated by the electromagnet unit can be appropriately adjusted by selectively driving the coil members. In addition, the coil members are press-fitted and installed in the fixing grooves. Therefore, by arranging the maximum number of lines in the fixing grooves, the intensity of the magnetic field generated by the electromagnet unit can be increased.

The attached drawings are intended to illustrate embodiments of the present invention. Therefore, it should be understood that some components may be exaggerated or omitted for efficient explanation of the embodiments.
Figure 1 is a perspective view showing the external shape of an electromagnet unit (1) according to one embodiment of the present invention.
Figure 2 is an exploded perspective view of the electromagnet unit (1) shown in Figure 1.
Fig. 3 is a plan view and a back view of the housing (10) in Fig. 2 and a cross-sectional view along line A-A'.
Fig. 4 is a rear view showing the configuration of the lower side of the cover (20) in Fig. 2.
Figure 5 is a cross-sectional view of a main part for explaining a method for manufacturing an electromagnet unit (1) according to the present invention.
Figure 6 is a cross-sectional view showing the structure of a housing (10) according to a modified example of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the embodiments described below are merely illustrative of one preferred implementation example of the present invention, and the examples of these embodiments are not intended to limit the scope of the rights of the present invention. Those skilled in the art will readily understand that the present invention can be implemented by various modifications without departing from the technical spirit thereof.

FIG. 1 is a perspective view of an electromagnet unit (1) according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electromagnet unit (1) shown in FIG. 1. In the drawing, the electromagnet unit (1) has a housing (10) in the shape of a disk or cylinder. Covers (20, 30) are installed on the upper and lower sides of the housing (10) as needed. A plurality of coil members (41, 42, 51, 52) are provided inside the housing (10). In the present embodiment, four coil members are shown, but the number of coil members is not specified. The coil members (41, 42, 51, 52) are configured to have a structure in which a conductor coated with an insulating material such as enamel is wound, as in a conventional one. In addition, preferably, an insulating film may be coated on the outer side of the coil member so as to completely surround the coil member. Each coil member (41, 42, 51, 52) is provided with a terminal pair (41a, 41b)(42a, 42b)(51a, 51b)(52a, 52b) for supplying driving current, and these are extended to the outside of the housing (10).

In FIGS. 1 and 2, the material of the housing (10) and the cover (20, 30) is not specified. Preferably, the housing (10) and/or the cover (20, 30) are made of a material that can be magnetized. In another preferred embodiment of the present invention, pure iron is used as the material of the housing (10) and the cover (20, 30). Pure iron has high permeability, excellent electrical conductivity, and relatively high coercive force. In addition, pure iron can be appropriately set to have its demagnetization time set by adjusting the cooling time after heating it to a certain temperature or higher.

The housing (10) is configured as a circular plate or cylinder having a hollow portion (11) in the central portion. Here, the hollow portion (11) is formed in consideration of the cooling efficiency of the electromagnet unit (1), and may be removed as needed. In addition, in a preferred embodiment, a core made of a magnetizable material may be inserted into the hollow portion (11). The diameter and height of the housing (10), i.e., the size of the housing, are not specified. The size of the housing may be appropriately changed depending on its usage environment. For example, when manufacturing an electromagnet unit that generates the same magnetic flux density, if the diameter of the housing is increased, the height of the housing may be correspondingly reduced.

Fig. 3 is a drawing showing a plan view, a back view, and a cross-sectional view of a housing (10). The cross-sectional view shows a cross-sectional configuration along line A-A' in the plan view of this drawing. In Figs. 2 and 3, first and second annular mounting grooves (12, 13) are sequentially provided in the upper part of the housing (10) from the inside centered on the hollow part (11), and correspondingly, third and fourth annular mounting grooves (14, 15) are sequentially provided in the lower part of the housing (10) from the inside centered on the hollow part (11). Preferably, the first mounting groove (12), the third mounting groove (14), and the second and fourth mounting grooves (13, 15) are formed in the same shape and size. Of course, the size and shape of each of these mounting grooves (12 to 15) are not specified.

In a preferred embodiment, the first to fourth settling grooves (12 to 15) are set in size, i.e., width and depth, so that their volumes are approximately the same. First to fourth coil members (41, 42, 51, 52) are installed in the first to fourth settling grooves (12 to 15), respectively. In a preferred application example of the electromagnet unit (1), the first to fourth coil members (41, 42, 51, 52) are set to provide the same magnetic flux, respectively. When the driving current values supplied to the first to fourth coil members (41, 42, 51, 52) are the same, the magnitude of the magnetic flux generated in the first to fourth coil members (41, 42, 51, 52) is determined by the length of each conductor. Accordingly, the cross-sectional areas of the second and fourth coil members (42, 52) are smaller than the cross-sectional areas of the first and third coil members (41, 51). Preferably, the sizes of the first to fourth mounting grooves (12 to 15) are set to appropriate sizes in consideration of the sizes of the coil members mounted therein. In a preferred embodiment of the present invention, the coil members (41, 42, 51, 52) are press-fitted into the mounting grooves (12 to 15), respectively. This is to bring the body (10) and the coil members (41, 42, 51, 52) into close contact with each other, thereby minimizing the loss of magnetic flux generated in the coil members (41, 42, 51, 52). When the width of the first and third anchoring grooves (12, 14) is W1, the depth is D1, and the width of the second and fourth anchoring grooves (13, 15) is W2, the depth is D2, W1 or D1 will be set larger than W2 or D2. In addition, considering the appropriate coercive force for the magnetic flux generated in the coil members (41, 42, 51, 52), the thickness of the outer wall of each anchoring groove (12 to 15) is set to, for example, 3 mm or more.

As described above, the coil members (41, 42, 51, 52) are each provided with a terminal pair (41a, 41b)(42a, 42b)(51a, 51b)(52a, 52b). In the terminal pair, one terminal (41a, 42a, 51a, 52a) is arranged on the upper outer periphery of the coil members (41, 42, 51, 52), while the other terminal (41b, 42b, 51b, 52b) is arranged on the lower inner periphery of the coil members (41, 42, 51, 52). Hereinafter, the terminals (41a, 42a, 51a, 52a) on one side are referred to as outer terminals, and the terminals (41b, 42b, 51b, 52b) on the other side are referred to as inner terminals. The pull-out positions of each terminal pair (41a, 41b)(42a, 42b)(51a, 51b)(52a, 52b) in the coil member (41, 42, 51, 52) are not specified. The pull-out positions of each terminal pair (41a, 41b)(42a, 42b)(51a, 51b)(52a, 52b) are appropriately set in consideration of the convenience of wiring of the electromagnet unit (1).

In FIGS. 1 to 3, on the upper and lower surfaces of the housing (10), more specifically, on the upper surfaces of each outer wall constituting the second and fourth mounting grooves (13, 15), cut grooves (131, 151) are provided so as to connect the outer side of the housing (10) with the mounting grooves (13, 15), respectively. These cut grooves (131, 151) are for drawing out the outer terminals (42a, 52a) of the second and fourth coil members (42, 52) to the outer side of the housing, respectively. In addition, on the inner walls of the first and second mounting grooves (12, 13), guide grooves (121, 132) are formed, respectively, for guiding the inner terminals (41b, 42b) of the first and second coil members (41, 42) upward. The inner terminals (41b, 42b) of the first and second coil members (41, 42) are each extended to the upper side of the housing (10) through the guide grooves (121, 132). In addition, similarly, guide grooves (141, 152) are formed on the inner walls of the third and fourth mounting grooves (14, 15) respectively to guide the inner terminals (51b, 52b) of the third and fourth coil members (51, 52) downward. The inner terminals (51b, 52b) of the third and fourth coil members (51, 52) are each extended to the lower side of the housing (10) through the guide grooves (141, 152).

The covers (20, 30) are configured in a plate shape with a hollow (20a, 30a) formed in the central portion, respectively. Preferably, the shape of the hollow (20a, 30a) is formed identically to the hollow portion (11) of the housing (10). Of course, the shape and size of the hollow (20a, 30a) are not specified and may be removed as needed. The thickness of the covers (20, 30) is set to, for example, within 10 mm for smooth magnetic flux projection in the upper and lower directions.

FIG. 4 is a rear view showing the configuration of the lower side of the cover (20). In FIG. 4, guide grooves (21 to 23) are formed on the lower side of the cover (20) to guide the inner terminal (42b) of the second coil member (42) and the outer and inner terminals (41a, 41b) of the first coil member (41) toward the outer side of the housing (10), respectively. In addition, in FIG. 2, guide grooves (31 to 33) are formed on the upper side of the cover (30) to guide the inner terminal (52b) of the fourth coil member (52) and the outer and inner terminals (51a, 51b) of the third coil member (51) toward the outer side of the housing (10), respectively.

An insulating film (60, 70) such as Teflon is attached to the outer surface of the cover (20, 30) as needed. A hollow space (60a, 70a) is formed in the central portion of the insulating film (60, 70) corresponding to the hollow space (20a, 30a) of the cover (20, 30).

Fig. 5 is a cross-sectional view of a main part for explaining a method for manufacturing an electromagnet unit (1) according to the present invention. When manufacturing an electromagnet unit (1) in the present invention, a housing (10) and a cover (20, 30) are first formed using a conventional method (Fig. 5a). These are formed using a method of casting a magnetizable material such as pure iron or processing a base material in the shape of a disc or cylinder. At this time, if necessary, heat treatment is performed on the housing (10) and the cover (20, 30).

Next, coil members (41, 42, 51, 52) are formed using a conventional method and placed in the mounting grooves (12 to 15) of the housing (10), respectively (Fig. 5b). At this time, it is preferable that the coil members (41, 42, 51, 52) have a width approximately equal to that of the mounting grooves (12 to 15) and a height greater than a certain degree. Next, the housing (10) to which the coil members (41, 42, 51, 52) are combined is placed on a support (not shown), and the upper side of the housing (10) is pressed downward for a certain period of time using a press device, thereby forcing the coil members (41, 42, 51, 52) into the mounting grooves (12 to 15) of the housing (10). Accordingly, the conductors constituting the coil members (41, 42, 51, 52) are filled at a very high density within the anchoring grooves (12 to 15).

Next, an insulating resin, such as an epoxy resin, is applied to the entire upper side of the housing (10) and the coil members (41, 42, 51, 52). At this time, a cover (20, 30) is installed on the upper side of the epoxy resin, if necessary. In addition, an insulating film (60, 70) is attached to the outer surface of the cover (20, 30), if necessary. Attachment of the insulating film (60, 70) can also be performed immediately after molding the cover (20, 30).

According to the electromagnet unit (1) according to the above embodiment, first, a plurality of coil members (41, 42, 51, 52) are mounted inside the housing (10). At this time, the coil members (41, 42, 51, 52) are connected in series or parallel with respect to a current source, or are individually driven. When the coil members (41, 42, 51, 52) are connected in parallel, the effect of lowering the overall resistance value of the coil members (41, 42, 51, 52) is obtained. In addition, when the coil members (41, 42, 51, 52) are individually driven, the intensity of the magnetic force generated in the electromagnet unit (1) can be adjusted according to the selective driving of the coil members (41, 42, 51, 52). In particular, the intensity of the magnetic force can be adjusted in a fine and stepwise manner by increasing the number of coil members provided in the housing (10).

In addition, since the coil members (41, 42, 51, 52) are pressed and arranged in the mounting grooves (12 to 15) of the housing (10), the maximum amount of conductors can be arranged for the same space of the mounting grooves (12 to 15). As is known, the strength of the magnetic field generated by the coil members (41, 42, 51, 52) is proportional to the length of the conductors. In addition, when the coil members (41, 42, 51, 52) are pressed into the mounting grooves (12 to 15), the conductors are arranged in maximum contact with each other in the mounting grooves (12 to 15), so that the free space between the housing (10) and the conductors is eliminated, thereby preventing loss of magnetic flux as much as possible. In addition, the above-mentioned electromagnet unit (1) can minimize the loss of magnetic flux and improve the efficiency of the electromagnet unit (1) by appropriately setting the material and thickness of the housing (10) and the cover (20, 30) to induce a smooth flow of magnetic flux passing through the entire housing.

Fig. 6 is a cross-sectional view showing a modified example of the above embodiment. In the embodiments shown in Figs. 1 to 4, the cross-sectional shape of the mounting grooves (12 to 15) formed in the housing (10) is formed in a square or rectangular shape. In contrast, in this example, the mounting grooves (12 to 15) formed in the housing (10) are formed in an arc shape at the corners. This example is designed so that the coil members (41, 42, 51, 52) can be placed more closely in the mounting grooves (12 to 15) by taking into consideration that the cross-sections of the conductors forming the coil members (41, 42, 51, 52) are circular. In addition, the other parts are substantially the same as the above-described embodiment.

In addition, in another preferred embodiment of the present invention, the coil member (41, 42, 51, 52) may be formed of a conductor having a square or rectangular cross-section. When forming a coil with a conductor having a circular cross-section, a certain amount of free space exists between the conductors. In contrast, when forming a coil by winding a conductor having a square or rectangular cross-section, the free space between the conductors can be minimized. In addition, a conductor having a square or rectangular cross-section has a larger surface area than a circular conductor having the same diameter as its width, so the overall resistance value of a coil member employing the conductor becomes smaller than a coil member using a circular conductor. In other words, a smoother flow of current can be provided. When forming an electromagnet unit, the length of the conductor constituting the coil member is set in consideration of the overall resistance value of the coil member. If the length of the conductor becomes longer than a certain amount, excessive heat is generated from the coil member, and the increase in the temperature of the coil member causes the resistance value of the coil member to increase again, which may cause a short circuit or fire in the coil member. If the overall resistance value of the coil member is lowered, the length of the conductor constituting the coil member can be increased, which provides the effect of enhancing the overall magnetic field strength of the electromagnet unit that employs the coil member.

Hereinafter, embodiments according to the present invention will be described. However, the present invention is not limited to the above-described embodiments and may be implemented by modifying them in various ways. For example, in the above-described embodiments, cut grooves (131, 151) are formed on the upper and lower surfaces of the housing (10), and the outer terminals (42a, 52a) of the second and fourth coil members (42, 52) are configured to be pulled out of the housing through these cut grooves. However, in another modified example of the present invention, the cut grooves (131, 151) of the housing (10) may be removed, and the outer terminals (42a, 52a) of the second and fourth coil members (42, 52) may be configured to be pulled out of the housing (10) through guide grooves formed in the cover (20, 30) like other terminals.

1: Electromagnetic unit, 10: Housing,
11: Hollow section, 12-15: 1st to 4th anchoring grooves,
20, 30: Cover,
21~23, 31~33: Guide Home,
41, 42, 51, 52: first to fourth coil members,
60, 70: Insulating film, 41a, 41b: Terminal pair,
42a, 42b: terminal pair, 51a, 51b: terminal pair,
52a, 52b: terminal pair, 131, 151: cut groove.

Claims (8)

In an electromagnet unit that generates a magnetic field according to the current supply,
Equipped with a housing in the shape of a disc or cylinder,
The above housing is made of a magnetizable material, and two or more annular mounting grooves are provided on the upper part of the housing, and two or more annular mounting grooves are provided on the lower part of the housing.
A coil member is installed in each of the above-mentioned mounting holes.
The coil member is provided with first and second terminals for supplying driving current to the conductor, and a conductor coated with an insulating material is wound around the conductor.
The inner wall of each of the above-mentioned anchoring grooves is provided with a first guide groove for guiding the first or second terminal upward, characterized in that:
The above coil members (41, 42, 51, 52) are each press-fitted into the mounting grooves (12 to 15), and this is to minimize the loss of magnetic flux generated in the coil members (41, 42, 51, 52) by bringing the body (10) and the coil members (41, 42, 51, 52) into close contact.
When the width of the first and third anchoring grooves (12, 14) is W1 and the depth is D1, and the width of the second and fourth anchoring grooves (13, 15) is W2 and the depth is D2, W1 or D1 is set larger than W2 or D2.
An electromagnet unit characterized in that the outer wall of each mounting groove (12 to 15) has a constant thickness, considering the coercive force for the magnetic flux generated from the coil member (41, 42, 51, 52). In the first paragraph,
An electromagnet unit characterized in that a hollow portion is provided in the central portion of the housing, penetrating the housing in the vertical direction. In the first paragraph,
The upper and lower sides of the above housing are additionally provided with covers,
The above cover is made of a magnetizable material,
An electromagnet unit characterized in that the inner surface of the cover is provided with a second guide groove for guiding the first or second terminal toward the outside of the housing. In the third paragraph,
An electromagnet unit characterized in that an insulating material is provided between the housing and the cover. In the third paragraph,
An electromagnet unit characterized in that an insulating film is attached to the outer surface of the cover. In the first paragraph,
An electromagnet unit characterized in that the lower edge of the above-mentioned mounting groove has an arc shape. In the first paragraph,
An electromagnet unit, characterized in that the conductor constituting the above coil member has a square or rectangular cross-section. In the first paragraph,
An electromagnet unit characterized in that the coil member is pressed into the mounting groove.

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