KR102692649B1 - Electromagnet Unit - Google Patents

Abstract

The present invention relates to an electromagnet unit that can change the strength of a magnetic field in various ways and increase the strength of the magnetic field. The electromagnet unit (1) according to the present invention is an electromagnet unit that generates a magnetic field, and is made of a material that can be magnetized, has a cylindrical shape, has an annular shape on the upper side, and includes two or more units for mounting a coil member. It is provided with a housing (10) provided with seating grooves (12, 13), and two or more coil members (30, 40) respectively installed in the seating grooves, wherein the coil members are wound with a conductor coated with an insulating material. In addition, it is characterized by being provided with a terminal pair for supplying electromagnet current to the conductor.

Description

Electromagnet Unit

The present invention relates to electromagnets, and particularly to an electromagnet unit that can change the strength of a magnetic field in various ways and increase the strength of the magnetic field.

Devices or parts that exhibit magnetism according to the flow of electric current are called electromagnets. In general, an electromagnet consists 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, including actuators for operating various valves, lifters for lifting heavy objects containing iron, clutch or brake devices for power transmission devices, and magnetic separators to separate magnetic and non-magnetic materials. As products become lighter, thinner, and shorter, the demand for electromagnets that can generate strong magnetic force in a compact structure is increasing. Additionally, in some application fields such as magnetic separators, it is required to be able to appropriately adjust the strength of the electromagnetic force. In general, the size of the magnetic force lines or magnetic field generated by an electromagnet is proportional to the length of the wound coil and the strength of the current flowing through the coil. In the case of an electromagnet in which a coil is wound around a bobbin, there are limitations in improving the performance of the electromagnet or appropriately adjusting the strength of the magnetic field due to the structural characteristics.

Meanwhile, Republic of Korea Patent No. 10-1735860 (name: electromagnet and electromagnetic coil assembly) discloses an electromagnet composed of a flat plate shape. The electromagnet or electromagnetic coil assembly disclosed herein has a structure in which an annular groove is formed in a pole piece made of a magnetizable material, a coil assembly is mounted there, and an armature plate is installed on the upper side. This invention creates 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 this has limitations in its scope of use, such as a clutch assembly for power transmission. Additionally, this invention has a problem in that magnetic flux loss occurs due to clearance between the coil assembly and the pole piece.

The present invention was created in consideration of the above-mentioned circumstances, and its technical purpose is to provide an electromagnet unit that can be light, thin, and compact, and can be appropriately applied and used in various usage environments.

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

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

The electromagnet unit according to the present invention for realizing the above object is an electromagnet unit that generates a magnetic field, is made of a magnetizable material, has a cylindrical shape, has an annular shape on the upper side, and is for mounting a coil member. It has a housing provided with two or more seating grooves, and two or more coil members each installed in the seating grooves, wherein the coil member is wound with a conductor coated with an insulating material and a terminal for supplying a driving current to the conductor. A pair is provided,

The housing has a hollow portion,

A cover is provided on the upper part of the housing,

The cover is made of a material that can be magnetized,

The coil member is installed by being press-fitted into the seating groove,
The terminal pair includes a first terminal coupled to the outer periphery of one side of the coil member and a second terminal coupled to the inner circumference of the other side,
A cut groove for pulling the first terminal outward is provided on the upper surface of at least one of the seating grooves,
The bottom of the seating groove is characterized in that a drawing hole is provided for drawing the first or second terminal of the coil member to the outside of the housing.

In addition, the coil member is characterized in that the length of each wound conductor is set to be the same.

Additionally, the housing is characterized in that it is made of heat-treated pure iron.

Additionally, the seating groove is characterized in that the lower edge portion has an arc shape.

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

According to the present invention having the above-described configuration, a plurality of seating grooves are provided on the upper side of the housing, and coil members are press-fitted into each of them and installed. The coil members are coupled to each other in series or parallel or driven individually. Therefore, the strength of the magnetic field generated by the electromagnet unit can be appropriately adjusted by selectively driving the coil member. Additionally, a coil member is press-fitted and installed in the seating groove. Therefore, by arranging as many lines as possible in the seating groove, it is possible to increase the strength of the magnetic field generated by the electromagnet unit.

The attached drawings are for explaining embodiments of the present invention. Therefore, for efficient description of the embodiment, it should be understood that some components may be exaggeratedly described or omitted.
Figure 1 is a perspective view of the electromagnet unit 1 according to an embodiment of the present invention as seen from above.
FIG. 2 is a perspective view of the electromagnet unit 1 shown in FIG. 1 viewed from below.
Figure 3 is an exploded perspective view of the electromagnet unit 1 shown in Figure 1.
FIG. 4 is a top and rear view of the housing 10 in FIG. 3 and a cross-sectional view taken along line A-A'.
Figure 5 is a main sectional view for explaining the manufacturing method of the electromagnet unit 1 according to the present invention.
Figure 6 is a cross-sectional view showing the structure of the housing 10 according to a modified example of the present invention.
Figure 7 is a perspective view showing the structure of the housing 10 and the cover 20 according to another modified example of the present invention.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. However, the embodiments described below illustratively show one preferred embodiment of the present invention, and the examples of these embodiments are not intended to limit the scope of the present invention. Those skilled in the art will easily understand that the present invention can be implemented with various modifications without departing from its technical spirit.

Figure 1 is a perspective view of the electromagnet unit 1 according to an embodiment of the present invention viewed from the top, and Figure 2 is a perspective view of the electromagnet unit 1 viewed from the bottom. Additionally, FIG. 3 is an exploded perspective view of the electromagnet unit 1 shown in FIG. 1. In the drawing, the electromagnet unit 1 has a cylindrical housing 10. A cover 20 is provided on the upper side of the housing 10 as needed. The housing 10 is provided with a hollow portion 11 in the central portion. This hollow part 11 takes into account the cooling efficiency of the electromagnet unit 1, and can be removed as needed. Insulating films 50 and 60, such as Teflon, are attached to the outer surfaces of the housing 10 and the cover 20, if necessary. The diameter and height of the housing 10, that is, the size of the housing, are not specified. The size of the housing 10 may be appropriately changed depending on its use environment. As an example, when manufacturing the electromagnet unit 1 that generates the same magnetic flux density, if the diameter of the housing 10 is increased, the height of the housing 10 can be correspondingly reduced.

A plurality of coil members are installed inside the housing 10. The number of coil members is not specified. In this example, a case in which two coil members, that is, first and second coil members 30 and 40, is provided will be described as an example. The coil members 30 and 40 are composed of a coiled wire coated with an insulating material such as enamel, as usual. In addition, preferably, the outside of the coil members 30 and 40 may be coated with an insulating film while completely surrounding the coil members 30 and 40 for more reliable insulation between the coil members 30 and 40 and the housing 10. there is. The first and second coil members 30 and 40 are provided with terminal pairs 31a and 31b (41a and 41b) for supplying driving current, respectively, and these are drawn out to the outside of the housing 10. The configuration of the coil members 30 and 40 and the lead-out structure of the terminal pairs 31a and 31b (41a and 41b) will be described in more detail later.

The materials of the housing 10 and the cover 20 are not specified. Preferably, the housing 10 and/or cover 40 are made of a material that can be magnetized. In another preferred embodiment of the present invention, pure iron is used as a material for the housing 10 and the cover 40. Pure iron has high magnetic permeability, excellent electrical conductivity, and relatively high coercivity. Additionally, the demagnetization time of pure iron can be appropriately set by heating it above a certain temperature and then adjusting the cooling time.

FIG. 4 is a top view, a rear view, and a cross-sectional view taken along line A-A' of the housing 10 in FIG. 3 . The upper part of the housing 10 is provided with a plurality of annular seating grooves, in this example, first and second seating grooves 12 and 12. In the drawing, an annular second seating groove 13 is provided on the outside of the first seating groove 12 at a constant distance from the first seating groove 12. The size and shape of the first and second seating grooves 12 and 13 are not specified. In a preferred embodiment, the sizes, that is, the width and depth, of the first and second seating grooves 12 and 13 are set so that their volumes are approximately the same. First and second coil members 30 and 40 are installed in the first and second seating grooves 12 and 13, respectively. The first and second coil members 30, 40 are driven together, alternately, or selectively. The driving method for the multiple coil members is not specified.

In some applications of the electromagnet unit 1, the first coil member 30 and the second coil member 40 are driven to generate first and second magnetic fluxes, respectively. And at this time, the first and second magnetic fluxes need to be set to the same size. When the driving current value supplied to the first and second coil members 30 and 40 is the same, the size of the magnetic flux generated in the coil members 30 and 40 is determined by the length of each conductor. Accordingly, the cross-sectional area of the second coil member 40 becomes smaller than the cross-sectional area of the first coil member 30. Preferably, the size of the seating grooves 12 and 13 is set to an appropriate size in consideration of the size of the coil members 30 and 40.

In a preferred embodiment of the present invention, the coil members 30 and 40 are press-fitted into the seating grooves 12 and 13, respectively. This is to minimize the loss of magnetic flux generated in the coil members 30 and 40 by bringing the housing 10 and the coil members 30 and 40 into close contact. When the width of the first seating groove 12 is W1 and the depth is D1, and the width of the second seating groove 13 is W2 and the depth is D2, the width (W1) of the first seating groove 12 is The depth D1 will be set larger than the width W2 or depth D2 of the second seating groove 13.

In addition, in consideration of the appropriate coercive force for the magnetic flux generated by the coil members 30 and 40, the thickness of the outer wall of the seating groove 12 is set to, for example, 3 mm or more. And, the thickness of the cover 20 is set to, for example, within 10 mm for smooth magnetic flux projection in the upper and lower directions.

As described above, the first and second coil members 30 and 40 are respectively provided with terminal pairs 31a and 31b (41a and 41b). In this terminal pair, one terminal (31a, 41a) is disposed on the upper outer periphery of the coil members (30, 40), while the other terminal (31b, 41b) is disposed on the lower inner periphery of the coil members (30, 40). Hereinafter, one terminal (31a, 41a) will be referred to as an outer terminal, and the other terminals (31b, 41b) will be referred to as an inner terminal. The extraction position of each terminal pair (31a, 31b) (41a, 41b) in the coil members (30, 40) is not specified. The extraction position of each terminal pair (31a, 31b) (41a, 41b) is the electromagnet unit (1). ) is set appropriately in consideration of wiring convenience.

1 to 4, at the lower part of the first seating groove 12 of the housing 10 are outlet holes 122 and 123 for drawing out the terminal pairs 31a and 31b of the first coil member 30, respectively, to the outside of the housing. ) is formed. And the inner surface of the outer wall constituting the first seating groove 12 is provided with a guide groove 121 for guiding the outer terminal of the first coil member 30 to the lower outlet hole 122. In addition, on the upper surface of the outer wall constituting the second seating groove 13, the outer terminal 41a of the second coil member 40 is connected to the outside of the housing while communicating with the outside of the housing 10 and the second seating groove 13. A cut groove 131 for drawing out is provided, and a drawing hole 132 is provided in the lower part of the second seating groove 13 for drawing out the inner terminal 41b of the second coil member 40 to the outside of the housing. . And, on the lower surface of the housing 10, guide grooves 141 to 143 are formed on the outer peripheral side while communicating with the outlet holes 122, 123, and 132. These guide grooves 141 to 143 are formed in the outlet holes 122. , 123, 132) to guide the terminals 31a, 31b, 41b drawn out toward the outer surface of the housing. The guide grooves 141 to 143 are designed to place the electromagnet unit 1 in close contact with another device or unit, and may be omitted as needed.

5 is a main sectional view for explaining the manufacturing method of the electromagnet unit 1 according to the present invention. When manufacturing the electromagnet unit 1 in the present invention, the housing 10 and cover 20 are first formed through a conventional method (FIG. 5a). Their forming is carried out by casting a material that can be magnetized, such as pure iron, or by processing a cylindrical base material. At this time, if necessary, heat treatment is performed on the housing 10 and cover 20.

Next, the first and second coil members 30 and 40 are formed through a conventional method, and are placed in the first and second seating grooves 12 and 13 of the housing 10, respectively (FIG. 5b). At this time, preferably, the first and second coil members 30 and 40 are formed to have approximately the same width and a certain height greater than the first and second seating grooves 12 and 13, respectively.

Next, the upper side of the housing 10 is pressed downward for a certain period of time using a press device to press the first and second coil members 30 and 40 into the first and second seating grooves 12 of the housing 10. 13) Press inward. Accordingly, the first and second seating grooves 12 and 13 are filled with conductive wires constituting the first and second coil members 30 and 40 at a very high density.

Next, an insulating resin, such as an epoxy resin, is applied entirely to the upper side of the housing 10 and the first and second coil members 30 and 40. And, if necessary, the cover 20 is sealed and installed on the upper side of the epoxy resin. Additionally, if necessary, insulating films 50 and 60 are attached to the upper surface of the cover 20 and the lower surface of the housing 10. It is also possible to attach the insulating films 50 and 60 immediately after molding the housing 10 and the cover 20.

According to the electromagnet unit 1 according to the above embodiment, the first and second coil members 30 and 40 are placed by press-fitting into the first and second seating grooves 12 and 13 of the housing 10, so that they are identical. It is possible to place as many conductors as possible in space. As is well known, the strength of the magnetic field generated by the coil members 30 and 40 is proportional to the length of the conductor wire. In addition, when the coil members 30 and 40 are press-fitted into the seating grooves 12 and 13, the conductors are placed in as close contact as possible within the seating grooves 12 and 13, so the clearance space between the housing 10 and the conductors is eliminated, thereby increasing the magnetic flux. Losses are prevented as much as possible. In addition, the above-described electromagnet unit 1 appropriately sets the material and thickness of the housing 10 and the cover 20 to induce a smooth flow of magnetic flux through the housing as a whole, thereby minimizing magnetic flux loss and improving the efficiency of the electromagnet unit. can be improved.

Additionally, the electromagnet unit 1 is provided with a plurality of coil members. These coil members are driven by supplying a driving current from outside. Therefore, by adjusting the driving method or number of these coil members, the strength of the magnetic field generated in the electromagnet unit 1 can be appropriately and arbitrarily varied.

Figure 6 is a main sectional view showing a modification of the above embodiment. 1 to 4, the cross-sectional shape of the first and second seating grooves 12 and 13 formed in the housing 10 is square or rectangular. In contrast, in this example, the corners of the first and second seating grooves 12 and 13 have an arc shape. In this example, considering that the conductors constituting the coil members 30 and 40 have circular cross-sections, the coil members 30 and 40 can be placed in closer contact with the seating grooves 12 and 13. And other parts are substantially the same as the above-described embodiment.

Additionally, in another preferred embodiment of the present invention, the coil members 30 and 40 may be composed of conductors having a square or rectangular cross-section. When a coil is formed with a conductor having a circular cross-section, a certain clearance space exists between the conductors. In contrast, when a coil is formed by winding conductors with a square or rectangular cross-section, the clearance space between the conductors can be minimized. In addition, since a conductor with a square or rectangular cross-section has a larger surface area than a circular conductor with the same diameter as its width, the overall resistance value of a coil member using it is lower than that of a coil member using a circular conductor. In other words, it is possible to provide a smoother flow of current. When constructing an electromagnet unit, the length of the conductors 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 level, excessive heat is generated from the coil member, and the increase in temperature of the coil member causes an increase in the resistance value of the coil member, which may result in a short circuit of the coil member or a fire. By lowering the overall resistance value of the coil member, it is possible to increase the length of the conductor constituting the coil member, which has the effect of increasing the overall magnetic field strength of the electromagnet unit employing the coil member.

Above, embodiments according to the present invention have been described. However, the present invention is not limited to the above-described embodiments and can be implemented with various modifications. For example, in the embodiment of FIG. 1, some terminals 31a, 31b, and 41b of the coil members 30 and 40 mounted on the housing 10 were described as being drawn outward through the lower part of the housing. However, the lead-out structure of each terminal pair 41a, 41b (51a, 51b) of the coil members 30 and 40 is not specified.

Figure 7 is a perspective view showing the structure of the housing 10 and the cover 20 according to another modified example of the present invention. In this example, a guide groove 125 is provided on the inner wall of the first seating groove 12 to guide the inner terminal 31b of the first coil member 30 upward, and the second seating groove 12 A guide groove 135 is provided on the inner wall to guide the inner terminal 41b of the second coil member 40 upward. And on the lower surface of the cover 20, the outer terminal 31a of the first coil member 30 and the inner terminal 31b of the first coil member 30 guided upward through the guide groove 125 are installed in the housing. In addition to the guide grooves 21 and 22 for guiding the outer direction, the inner terminal 41b of the second coil member 40 guided upward through the guide groove 135 is provided for guiding the inner terminal 41b of the second coil member 40 toward the outer side of the housing. A guide groove 23 is formed. In this modified example, the terminal pairs 31a, 31b (41a, 41b) of the first and second coil members 30 and 40 are pulled out through the upper part of the housing 10.

In addition, in Figure 1, it is shown that the terminals 31a, 31b, and 41b are disposed on the outside of the housing 10 after attaching the insulating film 60 to the housing 10. After placing the terminals 31a, 31b, and 41b, the insulating film 60 can be attached to the entire top surface.

1: electromagnet unit, 10: housing,
11: hollow part, 12, 13: first and second seating grooves,
20: cover, 30, 40: first and second coil members,
50, 60: insulating film, 31a, 31b: terminal pair,
41a, 41b: terminal pair, 121: guide groove,
131: Incision groove.

Claims (12)

In the electromagnet unit that generates a magnetic field,
A housing made of a material that can be magnetized, has a cylindrical shape, has an annular shape on the upper side, and is provided with two or more seating grooves for mounting a coil member;
Provided with two or more coil members each installed in the seating groove,
The coil member is wound with a conductor coated with an insulating material and is provided with a terminal pair for supplying a driving current to the conductor,
The housing has a hollow portion,
A cover is provided on the upper part of the housing,
The cover is made of a material that can be magnetized,
The coil member is installed by being press-fitted into the seating groove,
The terminal pair includes a first terminal coupled to the outer periphery of one side of the coil member and a second terminal coupled to the inner circumference of the other side,
A cut groove for pulling the first terminal outward is provided on the upper surface of at least one of the seating grooves,
An electromagnet unit, characterized in that the bottom of the seating groove is provided with a draw-out hole for drawing the first or second terminal of the coil member to the outside of the housing. delete delete delete delete According to paragraph 1,
An electromagnet unit, characterized in that the length of each coiled conductor of the coil member is set to be equal to each other. According to paragraph 1,
An electromagnet unit, characterized in that the housing is made of heat-treated pure iron. According to paragraph 1,
An electromagnet unit characterized in that the lower edge of the seating groove has an arc shape. delete delete delete According to paragraph 1,
An electromagnet unit, characterized in that the conductive wire constituting the coil member has a square or rectangular cross-section.

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