Electromagnet unit with cooling function

Abstract

The present invention relates to an electromagnet unit having a cooling function, which has a refrigerant circulation structure to enable reduction in thermal accumulation. The electromagnet unit with a cooling function, according to the present invention, comprises a housing (10) and a coil member (20) coupled to the housing (10). The housing (10) comprises an upper plate (11) and a lower plate (12), and further comprises a ring member (14) that supports between the upper plate (11) and the lower plate (12). The upper plate (11), the lower plate (12), and the ring member (14) form a magnetic path for the coil member (20). A plurality of cut grooves (111, 121) are provided respectively in the upper plate (11) and the lower plate (12) in the inward direction from the outer circumference. The cut grooves (111, 121) are in communication with each other in the housing (10) after respectively passing through the upper surface and the lower surface of the coil member (20). The cut grooves (111, 121) form a passage for circulating refrigerant.

Description

Electromagnetic unit with cooling function

[0001] The present invention relates to an electromagnet unit having a cooling function configured to reduce heat accumulation by having a refrigerant circulation structure.

[0002] 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. In addition, as another example of an electromagnet, Korean Patent 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 therein is composed of a structure in which a pole piece composed of a magnetizable material has an annular groove formed therein, a coil member is mounted therein, and an armature plate is installed on the upper side thereof.

[0003] Electromagnets have a wide range of applications. They are widely used in a wide range of fields, including actuators for operating various valves, lifters for lifting heavy objects containing iron, clutches and brakes for power transmission systems, and electromagnet units for motors and power converters.

[0004] The coil or coil element of an electromagnet is driven by alternating or direct current, and is switched as appropriate. In some applications, the coil element is driven at high frequencies. Heat is generated in the coil element primarily due to resistance loss or eddy currents. In particular, heat generation in the coil element increases dramatically as the frequency of the driving current or the driving frequency increases due to the skin effect and proximity effect. The heat generated in the coil element can accumulate in the coil element, particularly in electromagnet units equipped with a housing, leading to excessive heat accumulation inside the housing where the coil element is housed. This heat accumulation in the coil element causes a temperature increase in the conductors constituting the coil element. Furthermore, the increased temperature of the conductors increases their resistance, further increasing the heat generation in the coil element. This undesirable chain reaction not only reduces the magnetic field generation efficiency of the electromagnet unit, but can also lead to short circuits or fires in the coil element.

[0005] The present invention has been created in consideration of the above circumstances, and has a technical purpose of providing an electromagnet unit configured to have a cooling function and prevent excessive heat accumulation in a coil member.

[0006] In order to achieve the above object, an electromagnet unit having a cooling function according to the present invention is an electromagnet unit that generates a magnetic field when a driving current is supplied, the electromagnet unit comprises a housing, a conductor coated with an insulating material wound around a conductor and having a terminal for supplying a driving current, and a coil member accommodated inside the housing, the housing having a ring shape with a hollow central portion and having a ring member in which the coil member is accommodated inside, an upper plate disposed on one side of the coil member and having a disc shape, and a lower plate disposed on the other side of the coil member and having a disc shape, the upper plate having two or more first cut grooves from an outer periphery to an inner periphery, and the lower plate having two or more second cut grooves from an outer periphery to an inner periphery, and the first cut grooves and the second cut grooves are characterized in that they are mutually connected inside the housing.

[0007] In addition, the electromagnet unit with a cooling function according to the present invention for realizing the above object is an electromagnet unit that generates a magnetic field when a driving current is supplied, the electromagnet unit comprising: a housing having a cylindrical shape and having an annular receiving portion for receiving a coil member on one side; a coil member formed by winding a conductor coated with an insulating material and having a terminal for supplying a driving current, the coil member being installed in the receiving portion; an outer peripheral surface of the housing having two or more first cut grooves in the axial direction; one side of the coil member is provided with two or more first ducts extending from the outer peripheral side to the inner peripheral side of the coil member; and the other side of the coil member is provided with two or more second ducts extending from the outer peripheral side to the inner peripheral side of the coil member; one side of the first and second ducts is in communication with the first cut groove, and the other sides of the first and second ducts are in communication with each other inside the housing.

[0008] According to the present invention having the above-described configuration, the housing is made of a magnetizable material, and the coil member is installed in close contact with the housing. Accordingly, the magnetic field generated by the coil member can be efficiently projected to another adjacent device through the housing.

[0009] Additionally, the housing is provided with a plurality of ducts that completely surround the outer surface of the coil member. When heat is generated in the coil member, the temperature of the housing and its interior increases through heat conduction and heat radiation, thereby causing air flow between the interior and exterior of the housing. Convection of the air occurs through the ducts. Furthermore, the heat energy inside the housing is released to the exterior by the air flow through the ducts, thereby preventing excessive heat energy from accumulating in the housing and the coil member.

[0010] 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 description of the embodiments.

[0011] FIG. 1 is a perspective view showing an electromagnet unit (1) having a cooling function according to a first embodiment of the present invention.

[0012] Fig. 2 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 1.

[0013] Figure 3 is a plan view showing a state in which a support member (13) is placed on the upper side of the lower plate (12) in Figure 2.

[0014] Fig. 4 is a cross-sectional view showing the cross-sectional configuration along line A-A' in Fig. 1.

[0015] Figure 5 is a perspective view showing an electromagnet unit (1) with a cooling function according to a second embodiment of the present invention.

[0016] Fig. 6 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 1.

[0017] Fig. 7 is a plan view showing a state in which a support member (13), a ring member (14), and a sub-ring member (40) are arranged on the upper side of the lower plate (12) in Fig. 6.

[0018] Figure 8 is a perspective view showing an electromagnet unit (1) with a cooling function according to a third embodiment of the present invention.

[0019] Fig. 9 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 1.

[0020] Fig. 10 is a perspective view showing another configuration example of a cover (50) coupled to the upper and lower sides of a ring member (14, 60).

[0021] Fig. 11 is a perspective view showing the external shape of an electromagnet unit (1) with a cooling function according to a third embodiment of the present invention.

[0022] Fig. 12 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 11.

[0023] Fig. 13 is a plan view of the housing (10) shown in Fig. 12 and a cross-sectional view taken along line B-B'.

[0024] Fig. 14 is a perspective view showing another configuration example of the cover shown in Fig. 12.

[0025] Fig. 15 is a perspective view and a plan view showing a housing (90) in which a lower cover (40) is integrally formed with the housing (10) in Fig. 12.

[0026] Fig. 16 is a cross-sectional view showing the cross-sectional configuration along line A-A' in Fig. 11.

[0027] Fig. 17 is an exploded perspective view of an electromagnet unit (1) according to a fourth embodiment of the present invention.

[0028] Fig. 18 is a cross-sectional view showing a plan view of the housing (10) in Fig. 17 and a cross-sectional configuration along line C-C' in the plan view.

[0029] Fig. 19 is a perspective view showing the configuration of an electromagnet unit (1) according to a fifth embodiment of the present invention.

[0030] Fig. 20 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 19.

[0031] Fig. 21 is a plan view showing a state in which a support member (70) is placed on the upper or lower side of the duct member (70) in Fig. 20.

[0032] In order to achieve the above object, an electromagnet unit having a cooling function according to the present invention is an electromagnet unit that generates a magnetic field when a driving current is supplied, the electromagnet unit comprises a housing, a conductor coated with an insulating material wound around a conductor and having a terminal for supplying a driving current, and a coil member accommodated inside the housing, the housing having a ring shape with a hollow central portion and having a ring member in which the coil member is accommodated inside, an upper plate disposed on one side of the coil member and having a disc shape, and a lower plate disposed on the other side of the coil member and having a disc shape, the upper plate having two or more first cut grooves from an outer periphery to an inner periphery, and the lower plate having two or more second cut grooves from an outer periphery to an inner periphery, and the first cut grooves and the second cut grooves are characterized in that they are mutually connected inside the housing.

[0033] In addition, the outer surfaces of the upper and lower plates are each provided with a cover, and the cover is characterized in that it is formed in a circular shape and is made of a material that can be magnetized.

[0034] In addition, the upper or lower plate and the cover are characterized in that they are formed integrally.

[0035] In addition, the housing is characterized in that it is composed of a material that can be magnetized.

[0036] In addition, it is characterized in that it is formed in a circular shape, is installed and secured on the inside of the coil member, and is configured to additionally include a support member that supports the upper plate and the lower plate.

[0037] In addition, the diameter of the outer circumference of the support member is set to a size corresponding to the diameter of the inner circumference of the coil member, and the support member is provided with a third cutting groove from the outer circumference to the inner circumference, and the first cutting groove and the second cutting groove are characterized in that they are mutually connected through the third cutting groove.

[0038] In addition, the present invention is characterized in that two or more coil members are stored flatly inside the ring member, and a sub-ring member is provided between the coil members.

[0039] In addition, it is characterized in that at least one of the first and second cutting grooves is employed as a guide groove that guides the terminal of the coil member to the outside of the housing.

[0040] In addition, the conductor constituting the coil member is characterized in that its cross-section has a square or rectangular shape.

[0041] In addition, the upper and lower portions of the ring member are provided with two or more grooves along the outer periphery, the upper and lower plates are installed with the outer periphery in close contact with the inner periphery of the ring member, and the grooves are characterized in that they are connected to the first and second cut grooves.

[0042] In addition, the inner surface of the ring member is characterized by having a step portion for supporting the upper and lower plates.

[0043] In addition, the first and second incision grooves are characterized in that tubes for circulating refrigerant are installed.

[0044] -----

[0045] In order to achieve the above object, the present invention provides an electromagnet unit having a cooling function, which generates a magnetic field when a driving current is supplied, comprising: a housing having a cylindrical shape and having an annular receiving portion for receiving a coil member on one side; a coil member formed by winding a conductor coated with an insulating material and having a terminal for supplying a driving current, and installed in the receiving portion; an outer peripheral surface of the housing having two or more first cut grooves in the axial direction; one side of the coil member is provided with two or more first ducts extending from the outer peripheral side to the inner peripheral side of the coil member; and the other side of the coil member is provided with two or more second ducts extending from the outer peripheral side to the inner peripheral side of the coil member; and one side of the first and second ducts is in communication with the first cut groove, and the other sides of the first and second ducts are in communication with each other inside the housing.

[0046] In addition, the housing is characterized in that it has a communication portion therein for mutually connecting the first and second ducts.

[0047] In addition, the above-mentioned communication part is characterized by being configured to include a first circular communication groove provided on the inside of the storage part.

[0048] In addition, the outer wall of the first flue groove is characterized in that a second cut groove is provided along the axial direction of the housing.

[0049] In addition, the above-mentioned communication portion is characterized by having a second communication groove formed axially on the inner wall of the storage portion.

[0050] In addition, a disc-shaped duct member is provided inside the housing, and the duct member is characterized in that two or more third cut grooves are provided from the outer circumference toward the inner circumference.

[0051] In addition, it is characterized in that a first cover is provided on one side of the housing, and a duct member is provided between the coil member and the first cover.

[0052] In addition, it is characterized in that the first cover and the duct member are formed as one piece.

[0053] In addition, the other side of the housing is provided with two or more fourth cutting grooves from the outer periphery to the inner periphery, and the first or second duct is characterized in that it includes the fourth cutting groove.

[0054] In addition, the other side of the housing is provided with a second cover, and the housing is characterized in that it is provided with a mounting portion for connecting the second cover to the outside of the fourth cut groove.

[0055] In addition, the bottom surface of the storage portion is provided with two or more first flow grooves from the outer circumference to the inner circumference, and the first flow groove is characterized in that one side is connected to the first cut groove and the other side is connected to the communication portion.

[0056] In addition, the housing is characterized in that it is composed of a material that can be magnetized.

[0057] In addition, the storage unit is characterized in that two or more coil members are stacked and provided, and a duct member is installed between the coil members.

[0058] In addition, the coil member is characterized in that a support member is provided on the inner surface thereof, a third communication groove is provided in the axial direction on the outer surface thereof, and the first and second ducts are mutually connected through the third communication groove.

[0059] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are merely illustrative of one preferred implementation of the present invention, and these examples are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate that the present invention can be implemented with various modifications without departing from the technical spirit thereof.

[0060] FIG. 1 is a perspective view showing an electromagnet unit (1) having a cooling function according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the electromagnet unit (1) shown in FIG. 1. In FIG. 1, the electromagnet unit (1) has a housing (10) and a coil member (20) coupled to the housing (10). The housing (10) has an upper plate (11) and a lower plate (12), as well as a ring member (14) constituting the body of the housing (10). A coil member (20) is accommodated inside the ring member (14). The upper plate (11) is disposed on one side of the ring member (14), that is, on the upper side of the ring member (14) in the drawing. The lower plate (12) is disposed on the other side of the ring member (14), that is, on the lower side of the ring member (14) in the drawing. The ring member (14) and the upper plate (11) and lower plate (12) store the coil member (20) and form a shaft for the coil member (20).

[0061] A hollow portion (10a) is provided in the central portion of the housing (10). The hollow portion (10a) is provided to suitably couple the electromagnet unit (1) to another device or unit. The hollow portion (10a) may be omitted as needed.

[0062] A plurality of cut grooves (111, 121) are provided in the upper plate (11) and the lower plate (12) from the outer periphery inwardly, respectively. These cut grooves (111, 121) pass through the upper and lower surfaces of the coil member (20), respectively, and are then interconnected within the housing (10). The cut grooves (111, 121) are for the circulation of refrigerant including air. That is, the cut grooves (111, 121) constitute a refrigerant duct. In addition, at least one of the plurality of cut grooves (111, 121) functions as a guide groove for leading the terminals (20a, 20b) of the coil member (20) outwardly from the housing (10).

[0063] In Fig. 2, as described above, the electromagnet unit (1) has a housing (10) and a coil member (20), and the housing (10) has an upper plate (11), a lower plate (12), and a ring member (14). The coil member (20) generates a magnetic field by a driving current supplied from the outside, and the housing (10) stably supports and stores the coil member (20) and forms a magnetic path for the magnetic field generated in the coil member (20). Furthermore, the housing (10) has a support member (13) and a cover (15, 16). The support member (13) and the cover (15, 16) are intended to eliminate a gap between the coil member (14) and the housing and within the housing itself, thereby minimizing magnetic flux loss due to the gap. The support member (13) and the cover (15, 16) may be removed as needed.

[0064] The coil member (20) is configured to have a wound conductor coated with an insulating material such as enamel. In addition, preferably, an insulating film may be coated on the outer side of the coil member (20) to completely wrap the coil member (20) to ensure more reliable insulation between the coil member (20) and the housing (10). Terminals (20a, 20b) for supplying driving current are provided on the coil member (20). Here, one terminal (20a) is connected to the outer periphery of the coil member (20), and the other terminal (20b) is connected to the inner periphery of the coil member (20). As described above, these terminals (20a, 20b) are extended to the outside of the housing (10) through the cutouts (111, 121) of the upper plate (11) and the lower plate (12). Hereinafter, the terminal (20a) connected to the outer peripheral side of the coil member (20) is referred to as the outer terminal, and the terminal (20b) connected to the inner peripheral side of the coil member (20) is referred to as the inner terminal.

[0065] In addition, in a preferred embodiment of the present invention, the coil member (20) is composed of a conductor having a square or rectangular cross-section. A conductor having a square or rectangular cross-section has a larger surface area than a circular conductor having a diameter equal to its width, thereby providing an effect of reducing heat generation due to an increase in the skin effect.

[0066] In the housing (10), the upper plate (11) is formed in a circular shape, and a through hole (112) for forming a hollow portion (10a) is formed in the central portion. The upper plate (11) is formed of a material that can be magnetized and is suitably heat-treated. The heat treatment of the upper plate (11) is intended to suitably set the coercive force of the upper plate (11). As described above, the upper plate (11) is provided with a plurality of cut grooves (111) from the outer periphery to the inner periphery. The size and number of the cut grooves (111) are not specified. However, the length of the cut grooves (111) is set to be larger than the width of the coil member (20).

[0067] The lower plate (12) is preferably configured substantially the same as the upper plate (11) described above. The lower plate (12) is formed in a circular shape and is made of a magnetizable material, and is provided with a through hole (122) and a plurality of cut grooves (121). The size and position of the through hole (122) are substantially the same as those of the upper plate (11). In addition, although the shape and position of the cut groove (121) are illustrated in the drawing as being the same as the shape and position of the cut groove (111) of the upper plate (11), the shapes and positions of the cut groove (111) and the cut groove (121) may be set differently from each other.

[0068] In addition, in a preferred embodiment of the present invention, the upper plate (11) and the lower plate (12) are coated with an insulating material such as Teflon. This is to more reliably insulate the upper plate (11) and the lower plate (12) from the components therebetween, i.e., the coil member (20), the support member (13), and the ring member (144).

[0069] The support member (13) is formed in a circular plate shape, and a through hole (132) for forming a hollow portion (10a) is formed in the central portion. The support member (13), like the upper plate (11) and the lower plate (12), is formed of a material that can be magnetized, and is preferably coated with an insulating material such as Teflon. The diameter of the outer periphery of the support member (13) is set to a size corresponding to the diameter of the inner periphery of the coil member (20). The support member (13) is arranged while being seated in the central portion of the coil member (20), and the outer periphery of the support member (13) supports the inner periphery of the coil member (20). In addition, the thickness of the support member (13) is set to a size corresponding to the thickness of the coil member (20).

[0070] In particular, a plurality of cut grooves (131) are provided from the outer periphery to the inner periphery in the support member (13). Fig. 3 is a plan view showing a state in which the support member (13) is arranged on the upper side of the lower plate (12). As shown in the drawing, the cut grooves (131) of the support member (13) are provided at positions corresponding to the cut grooves (111, 121) provided in the upper plate (11) and the lower plate (12). Accordingly, the cut grooves (111, 121) are mutually connected through the cut grooves (131) of the support member (13). In addition, for smooth circulation of the refrigerant between the cut grooves (111, 121), the width of the cut grooves (131) is preferably set to a size equal to or larger than the width of the cut grooves (111, 121).

[0071] In addition, at least one of the above-described cut grooves (131) functions as a guide groove for the inner terminal (20b) of the coil member (20). The inner terminal (20b) of the coil member (20) is guided upward or downward through the cut groove (131) and then drawn outward from the housing (10) through the cut groove (111, 121) provided in the upper plate (11) or the lower plate (12).

[0072] The ring member (14) is formed in a hollow ring shape. The ring member (14), like the upper plate (11) and the lower plate (12), is made of a material that can be magnetized, and is preferably coated with an insulating material such as Teflon. The diameter of the inner periphery of the ring member (14) is set to a size corresponding to the diameter of the outer periphery of the coil member (20). The coil member (20) is arranged while being seated on the inside of the ring member (14), and the inner periphery of the ring member (14) supports the outer periphery of the coil member (20). In addition, the outer diameter of the ring member (14) is set to a size equivalent to the outer diameters of the upper plate (11) and the lower plate (12), and the height of the ring member (14) is set to a size corresponding to the thickness of the coil member (20). Accordingly, the coil member (20) is installed in close contact with the upper plate (11) and the lower plate (12) as a whole, together with the ring member (14) and the support member (13).

[0073] Covers (15, 16) are installed on the outer surfaces of the upper plate (11) and the lower plate (12), and on the upper side of the upper plate (12) and the lower side of the lower plate (12) in the drawing, respectively. The covers (15, 16) are formed in a circular shape, and a through hole (151, 161) for forming a hollow portion (10a) is formed in the central portion. The covers (15, 16), like the upper plate (11) and the lower plate (12), are made of a material that can be magnetized and are appropriately heat-treated. The covers (15, 16), together with the upper plate (11) and the lower plate (12), form a duct for the refrigerant and provide a magnetic path for a smoother flow of the magnetic field generated by the coil member (20). In addition, for more reliable insulation, the covers (15, 16) may also be coated with an insulating material such as Teflon, if necessary.

[0074] FIG. 4 is a cross-sectional view showing a cross-sectional configuration taken along line A-A' in FIG. 2. In the drawing, a support member (13) is disposed in close contact with the inner surface of a coil member (20), and a ring member (13) is disposed in close contact with the outer surface of the coil member (20). In addition, an upper plate (11) and a lower plate (12) are disposed in close contact with the upper and lower sides of the coil member (20), respectively. In addition, a cover (15) is disposed in close contact with the upper plate (11) on the upper side of the upper plate (11), and a cover (16) is disposed in close contact with the lower plate (12) on the lower side of the lower plate (12). The upper plate (11), the lower plate (12), the support member (13), the ring member (14), and the covers (15, 16) constitute a housing (10). Accordingly, the coil member (20) is mounted in close contact with the housing (10). As described above, all components constituting the housing (10) are made of a material that can be magnetized, thereby providing a path for projecting the magnetic field generated from the coil member (20). Accordingly, the magnetic field generated from the coil member (20) can be efficiently provided to other adjacent devices.

[0075] In particular, the housing (10) has a cut groove (111) of the upper plate (11), a cut groove (131) of the support member (13), and a cut groove (121) of the lower plate (12) that are mutually connected. Their connecting structure constitutes a refrigerant circulation passage for circulating refrigerant such as air, i.e., a refrigerant duct. The refrigerant duct is formed while passing through the upper surface, inner surface, and lower surface of the coil member (20). That is, the refrigerant duct is configured so that the refrigerant can flow while entirely surrounding the outer surface of the coil member (20). When the coil member (20) is driven, a large amount of heat is generated from the coil member (20). When heat is generated in the coil member (20), the temperature of the housing (10) and its interior increases through heat conduction and heat radiation. When the air temperature inside the housing (10) rises, a difference in air density occurs between the inside and outside of the housing (10), and due to this difference in density, air flow, i.e., convection, occurs between the inside and outside of the housing (10). At this time, the amount and speed of air flow are proportional to the difference in air density between the inside and outside of the housing (10). That is, when the temperature inside the housing (10) rises, the amount and speed of air flow increase in proportion thereto. The convection of air is performed through a refrigerant duct as indicated by a dotted line in the drawing. In addition, by the flow of the refrigerant, i.e., air, the heat energy inside the housing (10) is released to the outside, thereby preventing excessive heat energy from accumulating in the housing (10) and the coil member (20).

[0076] Fig. 5 is a perspective view showing an electromagnet unit (1) with a cooling function according to a second embodiment of the present invention, and Fig. 6 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 1. In some application fields such as magnetic separators, electromagnets are required to be able to appropriately adjust the strength of a magnetic field. In the present embodiment, a plurality of coil members are provided in the electromagnet unit so that the strength of the magnetic field can be adjusted in various ways. In addition, in the drawings of the present embodiment, parts that are substantially the same as those in the first embodiment described above are given the same reference numerals, and a detailed description thereof is omitted.

[0077] In the drawing, the housing (10) is provided with a plurality of, in this example, first and second coil members (21, 22). The coil members (21, 22), like the coil member (20) described above, are each configured to have a structure in which a conductor coated with an insulating material such as enamel is wound. More specifically, the first and second coil members (21, 22) are configured such that a hollow portion is formed in the central portion and the coils are wound in a circular shape to have an overall ring shape. In addition, the size of the hollow portion of the first coil member (21) is set to a size that allows the second coil member (22) to be placed inside it, so that the second coil member (22) is placed planarly within the space of the first coil member (21). In addition, preferably, an insulating film may be coated on the outer side of each coil member (21, 22) to completely wrap each coil member (21, 22) for more reliable insulation between them and the housing (10).

[0078] In a preferred application example, the first coil member (21) and the second coil member (22) are configured to generate magnetic fluxes of the same magnitude. When the field current values ​​supplied to the first and second coil members (21, 22) are the same, the magnitude of the magnetic flux generated in the coil members (21, 22) is determined by the length of each conductor. Accordingly, the cross-sectional area of ​​the second coil member (22) is set to be larger than the cross-sectional area of ​​the first coil member (21).

[0079] The coil members (21, 22) are provided with terminals (21a, 21b) (22a, 22b) for supplying field current, respectively. Here, one terminal (21a, 22a) is connected to the outer peripheral side of the coil member (21, 22), and the other terminal (21b, 22b) is connected to the inner peripheral side of the coil member (21, 22). As in the above-described embodiment, these terminals (21a, 21b) (22a, 22b) are extended to the outside of the housing (10) through the cut-out grooves (111, 121) of the upper plate (11) and the lower plate (12).

[0080] Coil members (21, 22) are sequentially stored inside the ring member (14). A sub-ring member (40) is provided between the coil members (21, 22). The sub-ring member (40) forms a path for the coil members (21, 22) that are arranged adjacent to the upper plate (11) and the lower plate (12).

[0081] The sub-ring member (14) is formed in a hollow ring shape on the inside. The sub-ring member (40), like other housing components, is formed of a magnetizable material and is preferably heat-treated. The diameter of the inner periphery of the sub-ring member (40) is set to a size corresponding to the diameter of the outer periphery of the coil member located inside thereof, i.e., the second coil member (22) in this embodiment. In addition, the diameter of the outer periphery of the sub-ring member (40) is set to a size corresponding to the diameter of the inner periphery of the coil member located outside thereof, i.e., the first coil member (21) in this embodiment. The sub-ring member (40) supports the outer periphery of the second coil member (22) and the inner periphery of the first coil member (21). The number of sub-ring members (40) is appropriately set to correspond to the number of coil members provided in the housing (10).

[0082] In addition, preferably, guide grooves (41, 42) are provided on the inner and outer surfaces of the sub-ring member (40), respectively. Here, the guide groove (41) is for guiding the outer terminal (22a) of the coil member (22) arranged on the inner side of the sub-ring member (40) in an upward or downward direction, and the guide groove (42) is for guiding the inner terminal (21b) of the coil member (21) arranged on the outer side of the sub-ring member (40) in an upward or downward direction.

[0083] Fig. 7 is a plan view showing a state where a support member (13), a ring member (14), and a sub-ring member (40) are arranged on the upper side of the lower plate (12). As shown in the drawing, the guide grooves (41, 42) are arranged at positions corresponding to the cut grooves (111, 121) provided in the upper plate (11) and the lower plate (12). Accordingly, the outer terminal (22a) of the second coil member (22) and the inner terminal (21b) of the first coil member (21) are guided upward or downward through the guide grooves (41, 42), and then guided to the outside of the housing (10) through the cut grooves (111, 121). In addition, in the present embodiment, a guide groove (141) is provided on the inner circumferential surface of the ring member (14) to guide the outer terminal of the first coil member (21) upward or downward. These guide grooves (41, 42, 141) can be selectively employed depending on the thickness of the conductor constituting the coil member (21, 22). That is, the guide grooves (41, 42, 141) can be removed when the thickness of the conductor constituting the coil member (21, 22) is below a certain level. In addition, the height of the sub-ring member (40) is set to a size corresponding to the thickness of the coil member (21, 22).

[0084] In this embodiment, a plurality of coil members (21, 22) are installed using a sub-ring member (40) on the inside of a ring member (14), and other configurations and operations are the same as in the above-described embodiment.

[0085] Fig. 8 is a perspective view showing an electromagnet unit (1) having a cooling function according to a third embodiment of the present invention, and Fig. 9 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 1. In addition, in this embodiment, parts that are substantially the same as those in the above-described embodiment are given the same reference numerals, and a detailed description thereof is omitted.

[0086] In this embodiment, a plurality of grooves (61, 62) are provided along the edges of the upper and lower portions of the housing (10), more specifically, the upper and lower portions of the ring member (60). These grooves (61, 62) are for the circulation of refrigerant, for example, air, between the outside and inside of the housing (10). In addition, at least one of the grooves (61, 62) functions as an extraction groove for extracting the terminals (20a, 20b) of the coil member (20) to the outside of the housing (10).

[0087] More specifically, the ring member (60) is formed in a hollow ring shape and is preferably coated with an insulating material such as Teflon. The ring member (60) is formed of a material that can be magnetized and is suitably heat-treated as needed. The diameter of the inner circumferential surface of the ring member (60) is set to a size corresponding to the diameter of the outer circumferential surface of the coil member (20). The coil member (20) is arranged while being seated on the inside of the ring member (60), and the inner circumferential surface of the ring member (60) supports the outer circumferential surface of the coil member (20).

[0088] The upper and lower portions of the ring member (60) are provided with step portions (63, 64) along the inner surface, respectively. These step portions (63, 64) are for supporting the upper and lower plates (11, 12). The vertical height between the step portions (63, 64) is preferably set to a size corresponding to the height of the coil member (20). In addition, the step portions (63, 64) can be removed as needed. In this case, the upper and lower plates (11, 12) will be supported by the upper and lower sides of the coil member (20).

[0089] In addition, a guide groove (65) is preferably provided on the inner surface of the ring member (60) to guide the outer terminal (20a) of the coil member (20) in an upward or downward direction. The guide groove (65) is positioned at a position corresponding to a predetermined groove (61, 62) of the ring member (60). Accordingly, the outer terminal (20a) of the coil member (20) is guided in an upward or downward direction through the guide groove (65) and then guided to the outside of the housing (10) through the groove (61, 62). The guide groove (65) can be removed when the thickness of the conductor constituting the coil member (20) is less than a certain value.

[0090] In this embodiment, the outer diameters of the upper and lower plates (11, 12) and the cover (15, 16) are formed to a size corresponding to the inner diameter of the ring member (60). Preferably, the upper and lower plates (11, 12) and the cover (15, 16) are pressed into the inner peripheral surface of the ring member (60).

[0091] In this embodiment, upper and lower plates (11, 12) and a cover (15, 16) are coupled to the inner surface of a ring member (60), and a duct formed by cut grooves (111, 121) of the upper and lower plates (11, 12) and grooves (61, 62) of the ring member (60) are connected, so that refrigerant circulating inside the housing (10) flows in and out through the grooves (61, 62). The other parts are the same as the embodiment described above.

[0092] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. The present invention can be implemented with various modifications without departing from the technical spirit thereof.

[0093] For example, in the above-described embodiment, the upper and lower plates (11, 12) and the covers (15, 16) may be configured integrally. Fig. 10 is a perspective view showing another configuration example of the cover (50) coupled to the upper and lower sides of the housing (10), i.e., the ring member (14, 60). In the drawing, the cover (50) is configured of a material that can be magnetized and is appropriately heat-treated as needed. In addition, preferably, the cover (50) is covered with an insulating material such as Teflon as a whole. A through hole (51) for forming a hollow portion (10a) is provided in the central portion of the cover (50), and a plurality of flow grooves (52) for the flow of a refrigerant such as air are provided on the inner surface, i.e., the side facing the coil member (20). The flow grooves (52) are formed radially inward from the outer periphery of the cover (52). The number, size, and shape of the flow grooves (52) are not specified. However, the length of the flow groove (52) is set to a size that can communicate with the cut groove (131) of the support member (13) in Fig. 2. The cover (50) is placed on the upper and lower sides of the ring member (14) in the embodiments of Figs. 1 and 5, or is pressed into the upper and lower sides of the ring member (60) in the embodiment of Fig. 8.

[0094] In addition, in the embodiment described above, a tube for circulating refrigerant may be installed in the communication structure formed by the cut groove (111) of the upper plate (11), the cut groove (131) of the support member (13), and the cut groove (121) of the lower plate (12).

[0095] In addition, the shape and structure of the support member (13) are not specified. Any structure that can stably support the coil member (20), the upper plate (11), and the lower plate (12) and provide communication between the cut grooves (111, 121) can be preferably employed as the support member (13).

[0096] In addition, in the drawings of the third to fifth embodiments of the present invention, parts that are substantially the same as those of the first and second embodiments described above are given the same reference numerals, and detailed descriptions thereof are omitted.

[0097] Fig. 11 is a perspective view showing an electromagnet unit (1) with a cooling function according to a third embodiment of the present invention. In the drawing, the electromagnet unit (1) has a housing (10). The housing (10) is configured in a cylindrical shape. The size and shape of the housing (10) are not specified. A coil member (20) for generating a magnetic field is provided inside the housing (10). In addition, upper and lower covers (30, 40) are provided on one side and the other side of the housing (10), and on the upper and lower sides of the housing (10) in the drawing, respectively.

[0098] A hollow portion (10a) is provided in the central portion of the housing (10). The hollow portion (10a) is provided to suitably couple the electromagnet unit (1) to another device or unit. The hollow portion (10a) may be omitted as needed.

[0099] In addition, a plurality of cut grooves (10b) are provided along the axial direction on the outer surface of the housing (10). The size and number of the cut grooves (10b) are not specified. Ducts (50, 60) are provided on one side and the other side of the coil member (20) corresponding to the positions of the cut grooves (10b), respectively. These ducts (50, 60) enter the inside of the housing (10) along the one side and the other side of the coil member (20) and then communicate with each other inside the housing (10). These ducts (50, 60) are for refrigerant circulation, for example, air circulation, between the outside and the inside of the housing (10). In addition, at least one of the ducts (50, 60) functions as a guide groove for leading the terminals (20a, 20b) of the coil member (20) outward from the housing (10).

[0100] Fig. 12 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 11. As described above, the electromagnet unit (1) has a housing (10) and a coil member (20), and an upper cover (30) and a lower cover (40) are provided on one side and the other side of the coil member (20), that is, on the upper and lower sides of the housing (10) in the drawing, respectively. In addition, a duct member (70) is provided between the coil member (20) and the upper cover (30). The coil member (20) generates a magnetic field by a driving current supplied from the outside through terminals (20a, 20b), and the housing (10), together with the covers (30, 40) and the duct member (70), stably supports and stores the coil member (20) and forms a magnetic path for the magnetic field generated in the coil member (20).

[0101] The coil member (20) is configured to have a wound conductor coated with an insulating material such as enamel. In addition, preferably, an insulating film may be coated on the outer side of the coil member (20) to completely wrap the coil member (20) to ensure more reliable insulation between the coil member (20) and the housing (10). Terminals (20a, 20b) for supplying driving current are provided on the coil member (20). Here, one terminal (20a) is connected to the inner peripheral side of the coil member (20), and the other terminal (20b) is connected to the outer peripheral side of the coil member (20). As described later, these terminals (20a, 20b) are guided to the outer peripheral side of the housing (10) through the cut groove (72) of the duct member (70) or the cut groove (10c) of the lower portion of the housing (10), and then are drawn out to the outside of the housing (10) through the cut groove (10b) of the housing (10). Hereinafter, the terminal (20a) connected to the inner peripheral side of the coil member (20) is referred to as an inner terminal, and the terminal (20b) connected to the outer peripheral side of the coil member (20) is referred to as an outer terminal.

[0102] In addition, in a preferred embodiment of the present invention, the coil member (20) is composed of a conductor having a square or rectangular cross-section. A conductor having a square or rectangular cross-section has a larger surface area than a circular conductor having a diameter equal to its width, thereby providing an effect of reducing heat generation due to an increase in the skin effect.

[0103] Fig. 13 is a cross-sectional view showing a plan view of the housing (10) in Fig. 12 and a cross-sectional configuration taken along line B-B' in the plan view. The housing (10) is made of a material that can be magnetized. In a preferred embodiment, the housing (10) is covered with an insulating material such as Teflon. The housing (10) is provided with a hollow portion (10a) in the central portion along the axial direction. An annular receiving portion (11) for receiving a coil member (20) is provided on one side of the housing (10), at the upper portion in the drawing. Preferably, the outer diameter of the inner wall (112) constituting the receiving portion (11) is set to a size corresponding to the inner diameter of the coil member (20), and the inner diameter of the outer wall (111) is set to a size corresponding to the outer diameter of the coil member (20). The coil member (20) is received while its inner and outer peripheries are in close contact with the receiving portion (11).

[0104] A circular mounting portion (12) is provided at the bottom of the housing (10) for attaching a lower cover (40). The size of the mounting portion (12) is not specified. The inner diameter of the mounting portion (12) is set to a size corresponding to the outer diameter of the lower cover (40). In a preferred embodiment, the lower cover (40) is press-fitted into the mounting portion (12) and attached.

[0105] A communication portion is provided on the inside of the housing (10) to mutually connect the ducts (50, 60) provided on one side and the other side of the coil member (20) in FIG. 11. In the present embodiment, the communication portion is configured as an annular communication groove (13). An annular communication groove (13) is provided on the inside of the receiving portion (11), that is, between the receiving portion (11) and the hollow portion (10a). In addition, a plurality of cut grooves (10c) are formed radially from the outer periphery to the inner periphery on the lower part of the housing (10). Preferably, one side of the cut groove (10c) is connected to the cut groove (10b), and the other side enters the inner side of the communication groove (13) and is connected to the communication groove (13). The cut groove (10b) constitutes a duct (60) for the coil member (20). In addition, at least one of the cut grooves (10b) functions as a guide groove for guiding the inner or outer terminal (20a, 20b) of the coil member (20) to the outer side of the housing (10).

[0106] The height of the inner wall (112) constituting the receiving portion (11) is set to a size corresponding to the height of the coil member (20), and a duct member (70) and an upper cover (30) are installed on the upper side of the inner wall (112). The inner wall (112) of the receiving portion (11) supports the inner peripheral surface of the coil member (20) and also supports the lower part of the inner peripheral surface of the duct member (70) and the upper cover (30). The inner wall (112) functions as a supporting member for the coil member (20), the duct member (70), and the upper cover (30). In addition, in a preferred embodiment, a plurality of cut grooves (10d) are provided in the axial direction on the inner wall (112). Accordingly, the receiving portion (11) and the communication groove (13) are communicated through the cut grooves (10d). Additionally, at least one of the cut grooves (10d) functions as a guide groove for the inner terminal (20a) of the coil member (20). The inner terminal (20a) of the coil member (20) is guided upward or downward through the cut groove (10d) and then drawn outward from the housing (10) through the cut groove (72 or 10c).

[0107] A duct member (70) is provided on one side of the coil member (20), that is, on the upper portion of the coil member (20) in the drawing. The duct member (70) is preferably made of a material that can be magnetized and is suitably heat-treated. In a preferred embodiment, the duct member (70) is coated with an insulating material such as Teflon. The duct member (70) has a disc shape and a through hole (71) is formed in the central portion. The outer diameter of the duct member (70) is set to a size corresponding to the inner diameter of the outer wall (111) of the receiving portion (11), and the inner diameter of the duct member (70) is formed to a size corresponding to the outer diameter of the inner wall (131) of the communication groove (12). Preferably, the duct member (70) is installed by being press-fitted into the housing (10). In particular, the duct member (70) is provided with a plurality of cut grooves (72) radially inward from the outer periphery. These cut grooves (72) are for forming a duct (50). At this time, one side of the cut groove (72) is connected to the cut groove (10b), and the other side is connected to the communication groove (13).

[0108] An upper cover (30) is installed on the outer side of the duct member (70), that is, on the upper side of the duct member (70) in the drawing. The upper cover (30) is preferably made of a material that can be magnetized and is suitably heat-treated. The upper cover (30) is formed in a circular shape, and a through hole (31) is provided in the central portion. The outer diameter of the upper cover (30) is set to a size corresponding to the inner diameter of the outer wall (111) of the receiving portion (11), and the inner diameter is formed to a size corresponding to the outer diameter of the inner wall (131) of the communication groove (12). Preferably, the upper cover (30) is press-fitted onto the upper part of the housing (10) together with the duct member (70).

[0109] In a modified example of the present invention, the upper cover (30) and the duct member (70) are configured integrally. Fig. 14 is a rear perspective view showing another configuration example of the upper cover (80) coupled to the upper side of the housing (10). In the drawing, the upper cover (80) is configured of a magnetizable material and is suitably heat-treated. A through hole (81) is provided in the central portion of the upper cover (80), and a plurality of flow grooves (82) for the flow of refrigerant such as air are provided on the inner side, that is, the side facing the coil member (20). The flow grooves (82) are formed radially in the inward direction from the outer periphery of the upper cover (80). The number, size, and shape of the flow grooves (82) are not specified. However, the length of the flow grooves (82) is set to a size that can communicate with the communication groove (13). In addition, the outer diameter of the upper cover (80) is set to a size corresponding to the inner diameter of the outer wall (111) of the receiving portion (11), and the inner diameter is formed to a size corresponding to the outer diameter of the inner wall (131) of the communication groove (12). Preferably, the upper cover (80) is press-fitted to the upper portion of the housing (10).

[0110] A lower cover (30) is installed on the mounting portion (12) at the bottom of the housing (10). The lower cover (30), like the upper cover (30), is made of a material that can be magnetized and is appropriately heat-treated. In addition, the lower cover (40) is formed in a circular shape and has a through hole (41) provided in the central portion. The outer diameter of the lower cover (40) is set to a size corresponding to the inner diameter of the mounting portion (12), and the inner diameter is formed to a size corresponding to the inner diameter of the hollow portion (10a) of the housing (10).

[0111] In addition, in another modified example of the present invention, the lower cover (40) may be formed integrally with the housing (10). FIG. 15 is a perspective view and a plan view of a housing (90) in a case where the lower cover (40) is formed integrally with the housing (10). In addition, in this modified example, the same parts as in the above-described embodiment are given the same reference numerals and a detailed description thereof is omitted. In this modified example, a plurality of flow grooves (91) are provided radially on the bottom surface of the housing (90). These flow grooves (91) constitute a duct (60). The flow grooves (91) are installed so as to extend from the outer periphery of the housing (90) toward the inner periphery. The size and number of the flow grooves (91) are not specified. However, one side of the flow groove (91) is communicated with the cut groove (10b) of the outer periphery of the housing (90), and the other side is communicated with the communication groove (13). In addition, the other parts are the same as in the above-described embodiment.

[0112] Fig. 16 is a cross-sectional view showing a cross-sectional configuration taken along line A-A' in Fig. 11. In the drawing, a coil member (20) is accommodated in a receiving portion (11) of a housing (10) while being in close contact with it, and a duct member (70) and an upper cover (30) are disposed in close contact with the upper side of the coil member (20). A lower cover (40) is press-fitted and installed in a mounting portion (12) at the bottom of the housing (10). As described above, the housing (10), the duct member (70), and the upper and lower covers (30, 40) are all made of a material that can be magnetized, thereby providing a magnetic path for projecting a magnetic field generated in the coil member (20). Accordingly, the magnetic field generated in the coil member (20) can be efficiently provided to other adjacent devices.

[0113] In particular, a cut groove (71) of a duct member (70) is arranged on the upper surface of the coil member (20), and a cut groove (10c) of a housing (10) is arranged on the lower surface of the coil member (20). These constitute ducts (50, 60), respectively. The ducts (50, 60) are installed so as to extend from the outer periphery of the coil member (20) toward the inner periphery, and are mutually connected to each other on the inner peripheral surface of the coil member (20) through a communication groove (13) and a cut groove (10d). These communication structures constitute a refrigerant circulation passage for circulating refrigerant such as air, i.e., a refrigerant duct. The refrigerant duct is formed by passing through the upper surface, the inner peripheral surface, and the lower surface of the coil member (20). That is, the refrigerant duct is configured so that the refrigerant can flow while entirely surrounding the outer surface of the coil member (20).

[0114] When the coil member (20) is driven, a large amount of heat is generated from the coil member (20). When heat is generated in the coil member (20), the temperature of the housing (10) and its interior increases through heat conduction and heat radiation. When the air temperature inside the housing (10) increases, a difference in air density occurs between the inside and the outside of the housing (10), and due to this difference in density, air flow, i.e., convection, occurs between the inside and the outside of the housing (10). At this time, the amount and speed of the air flow are proportional to the difference in air density between the inside and the outside of the housing (10). That is, when the temperature inside the housing (10) increases, the amount and speed of the air flow increase in proportion thereto. The convection of the air is performed through the refrigerant ducts (50, 60) as indicated by the dotted lines in the drawing. In addition, by the flow of the refrigerant, i.e., air, the heat energy inside the housing (10) is released to the outside, thereby preventing excessive heat energy from accumulating in the housing (10) and the coil member (20).

[0115] Fig. 17 is an exploded perspective view of an electromagnet unit (1) according to a fourth embodiment of the present invention, and Fig. 18 is a cross-sectional view showing a plan view of a housing (10) in Fig. 17 and a cross-sectional configuration along line C-C' in the plan view. In addition, in this embodiment, parts that are substantially the same as those in the above-described embodiment are given the same reference numerals, and a detailed description thereof is omitted.

[0116] In the embodiments of FIGS. 11 and 12, the communication portion for mutually connecting the ducts (50, 60) provided on one side and the other side of the coil member (20) is configured as an annular communication groove (13), and this communication groove (13) is formed on the inside of the receiving portion (11), that is, between the receiving portion (11) and the hollow portion (10a). In contrast, in the present embodiment, the communication portion is provided on the inner wall (112) of the receiving portion (11). In FIGS. 17 and 18, a plurality of communication grooves (10e) are formed on the inner surface of the inner wall (112) along the axial direction of the housing (10). In addition, one side of each of these communication grooves (10e) is connected to a cut groove (10c) at the lower part of the housing (10), and the other side is connected to a cut groove (172) of the duct member (70). Accordingly, the ducts (50, 60) provided on one side and the other side of the coil member (20) are mutually connected through the communication groove (10e). In addition, the communication groove (10e) functions as a guide groove for guiding the inner terminal (20a) of the coil member (20) toward the upper or lower direction of the coil member (20). In addition, the other configurations are substantially the same as the above-described embodiment.

[0117] Fig. 19 is a perspective view of an electromagnet unit (1) according to a fifth embodiment of the present invention. Electromagnets are required to be able to appropriately adjust the strength of their magnetic fields in some applications, such as magnetic separators. The present embodiment provides the electromagnet unit with a plurality of coil members to enable various adjustments of the strength of the magnetic field. Furthermore, in the drawings of the present embodiment, substantially identical parts to those of the third embodiment described above are given the same reference numerals, and a detailed description thereof is omitted.

[0118] In the present embodiment, a plurality of coil members are provided inside the housing (100). Although the drawing illustrates that two coil members (21, 22) are provided inside the housing (100), three or more coil members may be provided. In addition, ducts (50) are provided on one side and the other side of each coil member (21, 22), that is, on the upper and lower sides of each coil member (21, 22), corresponding to the positions of the cut grooves (10b), respectively. As in the above-described embodiment, these ducts (50) enter the inside of the housing (100) along one side and the other side of the coil member (21, 22) and then communicate with each other inside the housing (100). In addition, each coil member (21, 22) is provided with terminals (21a, 21b) (22a, 22b) for supplying driving current, and these terminals (21a, 21b) (22a, 22b) are extended to the outside of the housing (100) through a duct (50).

[0119] Fig. 20 is an exploded perspective view of the electromagnet unit (1) shown in Fig. 19. In the drawing, the housing (100) is made of a magnetizable material and is preferably heat-treated. In addition, in a preferred embodiment, the housing (100) is coated with an insulating material such as Teflon. As in the above-described embodiment, a circular receiving portion (11) for receiving coil members (21, 22) is provided on the upper portion of the housing (100). The axial length of the housing (100) and the depth of the receiving portion (11) are appropriately set according to the number of coil members to be received therein. In addition, a plurality of cut grooves (10b) are provided on the outer wall (111) constituting the receiving portion (11) along the axial direction, and a plurality of cut grooves (10c) are formed radially from the outer periphery toward the inner periphery on the lower portion of the housing (100) while communicating with the cut grooves (10b).

[0120] A plurality of coil members (21, 22) are installed in a stacked manner in the receiving portion (11) of the housing (100), and at this time, a duct member (70) is installed between each coil member (21, 22). As described above, the duct member (70) is provided with a plurality of cut grooves (72) from the outer periphery to the inner periphery. Of course, the cut grooves (72) constitute ducts (50, 60) for the coil members (21, 22). In addition, the cut grooves (72) are provided as guide grooves for guiding the inner or outer terminals (21a, 21b, 22a, 22b) of the coil members (21, 22) to the outer side of the housing (100) depending on the structure for connecting the coil members (21, 22).

[0121] In a preferred embodiment, a support member (120) is provided on the inner side of the coil member (21, 22). The support member (120) can be removed as needed. The support member (120) has a cylindrical shape, and a through hole (121) for forming a hollow portion (10a) is formed in the central portion. The support member (120) is made of a magnetizable material and is preferably heat-treated. In addition, in a preferred embodiment, the support member (120) is coated with an insulating material such as Teflon. The outer diameter of the support member (120) is set to a size corresponding to the inner diameter of the coil member (21, 22). The support member (120) is arranged while being seated in the central portion of the coil member (21, 22), and the outer periphery of the support member (120) supports the inner periphery of the coil member (21, 22). Additionally, the thickness of the support member (120) is set to a size corresponding to the thickness of the coil member (21, 22).

[0122] In particular, a plurality of communication grooves (122) are provided in the axial direction in the support member (120). Fig. 21 is a plan view showing a state in which the support member (70) is arranged on the upper or lower side of the duct member (70). The shape in which the support member (120) is arranged in the receiving portion (11) of the housing (100) is substantially the same as in Fig. 18 described above. As shown in the drawing, the communication grooves (122) of the support member (120) are provided at positions corresponding to the cut grooves (72) provided in the duct member (70). Accordingly, the cut grooves (72) of the duct member (70) installed on the upper and lower sides of the support member (120) are mutually communicated through the communication grooves (122) of the support member (120). In addition, the inner terminal (21a, 22a) of the coil member (21, 22) is guided upward or downward through the communication groove (122) and then guided to the outside of the housing (100) through the cut groove (72).

[0123] In this embodiment, a plurality of coil members are installed inside the housing (100) by alternately stacking and storing coil members (21, 22) and duct members (70) in the housing (100). In addition, the other configuration and operation are the same as in the embodiment described above.

[0124] In addition, in a modified example of the present embodiment, the duct member (70) and the support member (120) may be configured integrally. In addition, the structure and shape of the support member (120) are not specified. The support member (120) may preferably have any structure that can stably support the inner surface of the coil member (21, 22) and the duct member (70) or upper cover (40) provided on the upper side thereof, and ensure circulation of the refrigerant between the ducts (50, 60).

[0125] In addition, the support member (120) may be integrally joined to the bottom surface of the housing (100) in the same manner as the duct member (70) and the support member (120). In addition, in the present embodiment, the lower cover (50) may be integrally formed with the housing (100).

[0126] The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. The present invention can be implemented with various modifications without departing from the technical spirit thereof.

[0127] For example, in the above-described embodiment, tubes for circulating refrigerant may be installed in the ducts (50, 60) provided on the upper and lower sides of the coil member.

[0128] Additionally, in the above embodiment, the shape of the housing (10, 100) is not specified. The housing (10, 100) may be configured to have a planar shape of an oval or polygonal shape.

Claims

1. In an electromagnet unit that generates a magnetic field when a driving current is supplied, Housing and, It is configured by winding a conductor coated with an insulating material and having a terminal for supplying driving current, and including a coil member housed inside the housing. The above housing is formed in a ring shape with a hollow central portion, and has a ring member in which the coil member is stored on the inside, A top plate disposed on one side of the above coil member and having a circular shape, and A lower plate is provided on the other side of the coil member and has a circular plate shape. The above top plate is provided with two or more first cutting grooves from the outer periphery to the inner periphery, The above lower plate is provided with two or more second cutting grooves from the outer periphery to the inner periphery, An electromagnet unit having a cooling function, characterized in that the first cutting groove and the second cutting groove are mutually connected inside the housing.

2. In paragraph 1, The outer surfaces of the upper and lower plates are each provided with a cover, An electromagnet unit with a cooling function, characterized in that the cover is formed in a disc shape and is made of a material that can be magnetized.

3. In paragraph 2, An electromagnet unit with a cooling function, characterized in that the upper or lower plate and the cover are formed integrally.

4. In paragraph 1, An electromagnet unit having a cooling function, characterized in that the housing is composed of a material capable of being magnetized.

5. In paragraph 1, An electromagnet unit with a cooling function, characterized in that it is formed in a disc shape, is installed and secured on the inside of the coil member, and additionally includes a support member that supports the upper plate and the lower plate.

6. In paragraph 5, The diameter of the outer circumference of the above support member is set to a size corresponding to the diameter of the inner circumference of the above coil member, The above support member is provided with a third cutting groove from the outer circumference to the inner circumference, An electromagnet unit having a cooling function, characterized in that the first and second incision grooves are interconnected through the third incision groove.

7. In paragraph 1, An electromagnet unit with a cooling function, characterized in that two or more coil members are stored flatly inside the ring member, and a sub-ring member is provided between the coil members.

8. In paragraph 1, An electromagnet unit with a cooling function, characterized in that at least one of the first and second cutting grooves is employed as a guide groove that guides the terminal of the coil member to the outside of the housing.

9. In paragraph 1, An electromagnet unit with a cooling function, characterized in that the conductor constituting the above coil member has a square or rectangular cross-section.

10. In paragraph 1, The upper and lower portions of the above ring member are provided with two or more grooves along the outer periphery, The upper and lower plates are installed with their outer surfaces in close contact with the inner surfaces of the ring member. An electromagnet unit having a cooling function, characterized in that the above home is connected to the first and second cutting home.

11. In paragraph 10, An electromagnet unit with a cooling function, characterized in that the inner surface of the above ring member is provided with a step portion for supporting the upper and lower plates.

12. In paragraph 1, An electromagnet unit with a cooling function, characterized in that a tube for circulating a refrigerant is installed in the first and second incision grooves.

13. In an electromagnet unit that generates a magnetic field when a driving current is supplied, A housing having a cylindrical shape and a circular storage portion on one side for storing a coil member, A coil member having a terminal for supplying driving current and configured by winding a conductor coated with an insulating material, and installed in the receiving section; The outer surface of the above housing is provided with two or more first cutting grooves in the axial direction, On one side of the above coil member, two or more first ducts are provided from the outer circumference side of the coil member to the inner circumference side, On the other side of the coil member, two or more second ducts are provided from the outer circumference side of the coil member to the inner circumference side, The first and second ducts above are connected on one side with the first cut groove, An electromagnet unit having a cooling function, characterized in that the other sides of the first and second ducts are interconnected inside the housing.

14. In paragraph 13, An electromagnet unit with a cooling function, characterized in that the housing has a communication portion provided therein for mutually connecting the first and second ducts.

15. In paragraph 14, An electromagnet unit with a cooling function, characterized in that the above-mentioned communication part comprises a first annular communication groove provided on the inside of the storage part.

16. In paragraph 15, An electromagnet unit with a cooling function, characterized in that a second cut groove is provided along the axial direction of the housing on the outer wall of the first communication groove.

17. In paragraph 14, An electromagnet unit with a cooling function, characterized in that the above-mentioned communication part has a second communication groove formed axially on the inner wall of the above-mentioned storage part.

18. In paragraph 13, A disc-shaped duct member is provided inside the housing, An electromagnet unit with a cooling function, characterized in that the above duct member is provided with two or more third cut grooves from the outer circumference to the inner circumference.

19. In paragraph 18, A first cover is provided on one side of the above housing, An electromagnet unit with a cooling function, characterized in that a duct member is provided between the coil member and the first cover.

20. In paragraph 19, An electromagnet unit with a cooling function, characterized in that the first cover and the duct member are formed as one piece.

21. In paragraph 13, On the other side of the above housing, two or more fourth cutting grooves are provided from the outer periphery to the inner periphery, An electromagnet unit having a cooling function, characterized in that the first or second duct includes the fourth cut groove.

22. In paragraph 21, A second cover is provided on the other side of the above housing, An electromagnet unit with a cooling function, characterized in that the housing is provided with a mounting portion for joining a second cover to the outside of the fourth cutting groove.

23. In paragraph 14, The bottom surface of the above storage unit is provided with two or more first flow grooves from the outer periphery to the inner periphery, An electromagnet unit with a cooling function, characterized in that one side of the first fluid groove is connected to the first cut groove and the other side is connected to the communication portion.

24. In paragraph 13, An electromagnet unit having a cooling function, characterized in that the housing is composed of a material capable of being magnetized.

25. In paragraph 18, The above storage unit is provided with two or more coil members stacked on top of each other, An electromagnet unit with a cooling function, characterized in that a duct member is installed between the coil members.

26. In paragraph 13 or paragraph 25, A support member is provided on the inner surface of the above coil member, The outer surface of the above support member is provided with a third axial groove, An electromagnet unit having a cooling function, characterized in that the first and second ducts are mutually connected through the third communication groove.

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