JPH1074644A - Electromagnetic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic device capable of removing the oscillation to be generated from the butt part of a core exsistent in a magnetic circuit while effectively using a magnetic flux. SOLUTION: The electromagnetic device provided with a core forming a magnetic circuit of a side leg and a central leg also a coil fitted with this core is further arranged with an air gap part in a part of the magnetic circuit. In such a constitution, the core is composed of an almost square type core 40 forming the side leg and almost I type core 45 forming the central leg arranged in the square core 40 besides, air gap forming members 55, 55 made of a non-magnetic material are interposed between both ends of the I type core 45 to be formed in the air gap part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device used for a magnetic circuit such as a discharge lamp ballast including a core and a coil.

[0002]

2. Description of the Related Art The prior art will be described with reference to FIGS.

FIG. 7 shows an electromagnetic device in which E-shaped cores are joined to each other to form a magnetic circuit which is a magnetic circuit. The E-shaped core 5 is formed by laminating E-shaped steel sheets 6 made of silicon steel or the like. It comprises an I-shaped central leg 8 formed at the center in a substantially I shape, and a substantially U-shaped side leg 9 formed at one end of the central leg 8.

The tip 8a of the center leg 8 is
A gap, which is an air gap portion 10, is formed between the central legs 8, 8 of the substantially Japanese-shaped core 3 formed shorter than both the front ends 9a, 9a of the E-shaped cores 5, 5 butted together. Have been.

[0005] The coil 15 is formed by winding an electric wire 17 around a winding frame 16 made of an epoxy material or the like. The coil 15 is inserted into the center legs 8, 8 of the above-mentioned substantially Japanese-shaped core 3, and then, Butt portions 12, 12 of U-shaped side legs 9, 9
Are electrically welded to join and fix the E-shaped cores 5 and 5 together.

FIG. 8 shows an electromagnetic device in which a U-shaped core and a T-shaped core are combined to form a magnetic circuit as a magnetic circuit.
Numeral 0 denotes a laminate of U-shaped U-shaped steel plates 21 made of a silicon steel plate or the like and having one opening, and the U-shaped core 20 forms U-shaped side legs 23.

The T-shaped core 25 is formed by laminating a T-shaped T-shaped steel plate 26 made of a silicon steel plate or the like. The T-shaped core 25 has an I-shaped central leg 27 formed substantially in the longitudinal direction and an I-shaped central leg 27. An I-shaped side leg 28 of a substantially I-shape is formed at one end of the leg 27 at a right angle.

[0008] The T-shaped core 25 is incorporated into the open end of the U-shaped core 20 to form a substantially Japanese-shaped core 30, and is located between the tip 25 a of the T-shaped core 25 and the bottom surface of the U-shaped core 20. The air gap portion 10 is formed with a gap.

The coil 15 is formed by winding an electric wire 17 around a winding frame 16 made of an epoxy material or the like. The coil 15 is inserted into the central leg 27 of the above-mentioned substantially Japanese-shaped core 30, and then a T-shaped coil is formed. The butted portions 32, 32 of the core 25 and the U-shaped core 20 are electrically welded, and the T-shaped core 25 and the U-shaped core 2 are welded.
0 is fixedly joined.

The air gap is provided for the purpose of suppressing the saturation of magnetism generated in the core of the magnetic circuit.

[0011]

As described above, the core constituting the magnetic path of the conventional electromagnetic device is generally provided with one air gap portion for the purpose of suppressing magnetic saturation. It is.

That is, in the case where the E-shaped cores shown in FIG. 7 are butted together, one air gap portion is provided between the center legs.

Further, in the combination of the U-shaped core and the T-shaped core shown in FIG. 8, a T-shaped core is incorporated at the open end of the U-shaped core, and the amount of pushing of the T-shaped core into the U-shaped core is reduced. By adjustment, one air gap is provided between the central leg of the T-shaped core and the bottom of the U-shaped core.

As described above, in the conventional electromagnetic device, one air gap portion and two abutting portions of the cores are formed, and the abutting portions of the cores are joined and fixed by electric welding or the like. However, between the opposing cores of the abutting portion, there is an air gap portion, which is a fine void.

For this reason, there is a problem that the magnetic flux is disturbed at the abutting portion and the magnetic resistance is increased, so that the magnetic flux cannot be effectively used.

Further, since there is a joint in a part of the core constituting the magnetic circuit, a minute gap may be generated between the stacked steel sheets. In this case, the steel sheets may vibrate vertically. is there. Further, there is a problem that vibration may not be generated in the steel plate due to the attraction force between the iron cores of the opposed butting portions.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an electromagnetic device for effectively utilizing a magnetic flux and removing a vibration generated from an abutting portion of a core existing in a magnetic path. .

[0018]

According to a first aspect of the present invention, there is provided an electromagnetic device comprising: a core forming a magnetic path by a side leg and a center leg; and a coil mounted on the core. In an electromagnetic device having an air gap provided in a part of a magnetic path,
The core comprises a substantially square core forming the side legs, and a substantially I core forming the central leg disposed in the substantially square core. The substantially I core is provided in the air gap portion. Are formed with air gap forming members made of a non-magnetic material interposed at both ends.

Further, in the electromagnetic device according to the present invention, the air gap forming members are arranged at both ends of the substantially I-shaped core, and positioning projections are formed on these air gap forming members so as to project outward. The positioning recesses into which the positioning projections fit are formed so as to face the inner surface of the square core.

As described above, the electromagnetic device of the present invention is arranged at the center in the width direction along the longitudinal direction of the substantially rectangular core which is the side leg and the through hole of the substantially rectangular core, and has the non-terminal at both ends. Since a substantially I-shaped core, which is a center leg to which an air gap forming member made of a magnetic material is attached, is attached, a magnetic path consisting of a substantially square-shaped core and a substantially I-shaped core is joined with each other. A magnetic path without parts is formed.

Therefore, the absence of the butting portion enables effective utilization of the magnetic flux without disturbance of the magnetic flux generated at the butting portion and generation of magnetic resistance. In addition, factors that cause vibration are eliminated.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that the same components as in the prior art will be described with the same reference numerals.

FIG. 2 is a perspective view showing each component of the electromagnetic device according to the present invention.

The electromagnetic device comprises a substantially rectangular core 40 having a substantially rectangular shape forming side legs, and a substantially I-shape forming a central leg separated from the rectangular core 40 and having both ends forming arc-shaped convex surfaces 46, 46, respectively. And a substantially I-shaped core 45, a magnetic path as a magnetic circuit is formed.

Further, a gap, which is an air gap portion, is formed between the inner surface of the substantially square-shaped core 40 and both ends of the substantially I-shaped core 45. Air gap forming member 5 interposed in
5, 55, and the coil 15 attached to the substantially I-shaped core 45.

The coil 15 is made of a winding frame 16 made of an insulating material such as an epoxy material and formed with flanges 16a at both ends, and an electric wire 17 wound around the winding frame 16 (see FIG. 3). It is composed of

Further, a rectangular column-shaped fitting hole 18 is formed through the center of the winding frame 16 along the longitudinal direction, and a groove is formed along the longitudinal direction at the center of the lower surface of the fitting hole 18. Are formed.

The substantially I-shaped core 45 is formed by laminating a substantially I-shaped substantially I-shaped steel plate 47 made of a silicon steel plate or the like, and the substantially I-shaped core 45 forms a central leg 48. This I
The shaped core 45 is inserted and mounted in the prismatic fitting hole 16 of the winding frame 16 in a lightly fitted state.

The substantially rectangular core 40 is formed by laminating a substantially rectangular steel plate 41 made of a silicon steel plate or the like, and the substantially rectangular core 40 forms a substantially rectangular side leg 42. ing.

Further, in the center of the substantially square-shaped core 40, there is formed a prismatic through-hole 43 into which the coil 15 is to be incorporated. Arc-shaped convex surfaces 46 of the shaped core 45
Is substantially I-shaped core 45 so that
Is mounted at the center in the width direction.

The arc-shaped convex surfaces 46 and 4 of the substantially I-shaped core 45
Air gaps, which are arc-shaped air gap portions, are formed between the inner surface 6 and the inner surface of the substantially square-shaped core 40, and an arc-shaped air gap forming member 55 interposed between these air gap portions is provided. The air gap forming member 55 is made of a non-magnetic material that is a material other than a magnetic material such as a synthetic resin, for example.

On the inner surface of the substantially rectangular core 40, arcuate concave surfaces 44, 44 are formed opposite to each other with the arcuate air gap therebetween.
Air gap forming members 55, 5
Positioning recesses 44a, 44a for positioning and fixing 5 are formed facing each other.

A convex positioning projection 58 fitted into the positioning recess 44a is formed so as to protrude outward from the outer surface of the air gap forming member 55.

Further, a receiving member 50 is formed so as to protrude inward from a lower end of the air gap forming member 55 and abut on the bottom surface of the I-shaped core 45. A rectangular engaging projection 51 extending horizontally from the tip of the receiving member 50 and engaging with the engaging groove 19 formed on the lower surface of the fitting hole 18 of the winding frame 16 is formed.

A method of assembling the electromagnetic device will be described with reference to FIGS.

As shown in FIG. 1, the arc-shaped convex surfaces 46, 46 formed at both ends of the substantially I-shaped core 45 project from both ends of the fitting hole 18 of the coil 15, and the substantially I-shaped core 45 is It is fitted and fitted in the fitting hole 18 of the coil 15.

Then, the air gap forming member 55
Is engaged with the engaging groove 19 formed on the lower surface of the reel 16, and the air gap forming member 55 is pushed toward the reel 16, and the arc-shaped convex surface 46 of the substantially I-shaped core 45 is formed.
And attached to the coil 15.

The positioning projection 58 of the air gap forming member 55 is mounted at the center in the width direction along the longitudinal direction of the substantially I-shaped core 45 as the central leg.

As shown in FIG. 1 and FIG.
The positioning projections 58, 58 of the air gap forming members 55, 55 incorporated at both ends of the core are pushed into the positioning recesses 44a, 44a of the substantially rectangular core 40 from above, respectively, and assembled.

As shown in FIG. 3, arcuate convex surfaces 46, 46 formed at both ends of a substantially I-shaped core 45 as a central leg and arcuate concave surfaces 44, 44 of a substantially U-shaped core 40 as a side leg. Air gap forming members 55, 55 are interposed at the central portions of the air gap portions 10, 10 formed therebetween, and air gap portions made of air are formed on both sides of the air gap forming members 55, 55, respectively. ing.

In the above description, air gap portions made of air are formed on both sides of the air gap forming member.
As shown in FIG. 5, the width of the air gap forming member 55 is substantially I
The air gap portion may be formed from a non-magnetic material with the air gap forming members 55 and 55 interposed therebetween by being formed to have substantially the same width as the shape core 45.

As shown in FIG. 6, the method of fixing the air gap forming member may be a method of sandwiching the air gap forming member between the ends of the substantially square-shaped core 40.

More specifically, a positioning projection 58 is formed on the air gap forming member 55, and holding pieces 60, 60 are formed horizontally outward from upper and lower ends of the air gap forming member 55, respectively. I do. The space between the sandwiching pieces 60 is sized to engage in the thickness direction of the substantially square core 40.

A method of attaching the substantially square core 40 of the air gap forming member 55 will be described.

After the air gap forming member 55 is disposed in the through hole 43 of the substantially square core 40, the holding pieces 60, 60 of the air gap forming member 55 are moved in the thickness direction of the substantially square core 40 to hold the air gap forming member 55. The inner surfaces of the pieces 60, 60 move while sliding on the upper and lower surfaces of the substantially square-shaped core 40, and the positioning projections 58 of the air gap forming member 55 are fitted into the positioning recesses 44 a of the substantially square-shaped core 40, so that the substantially square-shaped core is formed. Attached to 40. Then, the substantially I-shaped core 45, which is the central leg to which the core 15 is attached, is inserted and fitted so as to be fitted between the inner surfaces of the air gap forming members 55, 55, and the electromagnetic device is assembled.

The operation of the above embodiment will be described.

The electromagnetic device according to the present invention has a substantially rectangular core which is a side leg, and an air gap which is disposed at the center in the width direction along the longitudinal direction in a through hole of the substantially rectangular core, and has a non-magnetic material at both ends. A substantially I-shaped core, which is a central leg to which the forming member is attached, is attached. A coil is attached to the substantially I-shaped core.

As described above, through the air gap forming member, a substantially square core as a side leg and a substantially I-shaped core as a central leg are provided.
Since the magnetic path is formed by assembling the shaped core and the magnetic path, there is no mechanically connected butting portion in the magnetic path, and vibration generated by the butting portion of the cores present in the magnetic path can be eliminated. . In addition, the disturbance of the magnetic flux and the magnetic resistance at the butting portion are also eliminated, and the effective use of the magnetic flux can be achieved.

Since the air gap portion is formed by the air gap forming member, there is no mechanical joining error caused by the butted portion, and no variation in the air gap portion occurs.

The air gap portion can be freely changed only by changing the shapes of the air gap forming member and the substantially I-shaped core serving as the center leg.

Further, after a substantially I-shaped core serving as a center leg is fitted into the fitting hole of the coil, an air gap forming member is attached to each end of the substantially I-shaped core, and the air gap forming member is engaged. The projection is engaged with the engagement groove of the fitting hole to form an assembled state, and in this assembled state, the electromagnetic device can be easily assembled because the assembly can be assembled to the substantially square core, which is the side leg.

The positioning protrusion of the air gap forming member for attaching the substantially I-shaped core, which is the central leg, to the substantially U-shaped core, which is the side leg, is located at the center in the width direction of the substantially I-shaped core. When the heading moves from the substantially I-shaped core, which is the central leg, to the side legs, the positioning convex portion of the air gap forming member is removed from the magnetic path, so that the influence on the magnetic characteristics is small.

Although the substantially I-shaped core serving as the center leg is not held by press-fitting between the cores, the air gap portion is substantially I-shaped.
The two ends are almost equally divided at both ends of the shaped core.
By passing substantially the same magnetic flux through the divided air gaps, the attractive force between both ends of the substantially I-shaped core and the substantially square-shaped core is:
The forces are offset and the weakness of the mechanical fixation is sufficiently compensated.

In the method of integrally molding the substantially I-shaped core serving as the central leg and the winding frame, the air gap forming member and the positioning projection formed on the outer surface of the air gap forming member are integrally formed together. It may be something.

Although the substantially I-shaped core and the substantially square-shaped core have been described by laminating steel plates such as silicon steel plates, it is needless to say that they may be integrally formed of ferrite. is there.

[0056]

As described above, according to the first aspect of the present invention, the core has a substantially rectangular core forming side legs and an air gap portion is formed at both ends in the substantially rectangular core. A substantially I-shaped core that forms a central leg, and an air gap forming member made of a non-magnetic material is interposed in the air gap portion, so that it is composed of a substantially square-shaped core and a substantially I-shaped core. Since the magnetic path becomes a magnetic resistance and there is no abutting portion where the magnetic flux is disturbed, the magnetic flux can be effectively used.

Further, since the air gaps are formed at both ends of the substantially I-shaped core forming the central leg, the suction force between both ends of the substantially I-shaped core and the substantially square-shaped core is canceled by the force. Hardly affected by power. For this reason, the occurrence of vibration can be suppressed to a minimum, in combination with the absence of the butted portion.

According to the second aspect of the present invention, since the positioning convex portion is formed on the air gap forming member, the positional relationship between the substantially I-shaped core as the center leg and the substantially square-shaped core as the side leg is kept constant. Therefore, the influence on the magnetic characteristics can be reduced.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view showing a procedure for assembling an electromagnetic device according to a first embodiment of the present invention;

FIG. 2 is an exemplary perspective view showing components of the electromagnetic device according to the embodiment;

FIG. 3 is an exemplary perspective view showing an assembled state including a partial cross section of the electromagnetic device according to the embodiment;

FIG. 4 is a perspective view showing components of an electromagnetic device including another air gap forming member of the present invention.

FIG. 5 is a perspective view showing an assembled state including a partial cross section of the electromagnetic device in the above.

FIG. 6 is a perspective view showing components of an electromagnetic device including a second air gap forming member of the present invention.

FIG. 7 is a perspective view showing an assembled state including a partial cross section of an electromagnetic device according to the related art.

FIG. 8 is a perspective view showing an assembled state including a partial cross section of an electromagnetic device according to another related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Air gap part, 15 ... Coil, 40 ... Substantially square-shaped core which forms a side leg, 44a ... Positioning recessed part, 45 ... Substantially I-shaped core which forms a center leg, 55 ... Air gap forming member, 58 ... Positioning convex Department.

Claims (2)

[Claims] 1. An electromagnetic device comprising: a core forming a magnetic path by a side leg and a center leg; and a coil mounted on the core, wherein an air gap is provided in a part of the magnetic path. A substantially rectangular core forming legs; and a substantially I-shaped core forming the central leg disposed in the substantially rectangular core. The air gap portion includes a non-magnetic material at both ends of the substantially I-shaped core. An electromagnetic device formed by interposing an air gap forming member made of a material. 2. The air gap forming member is disposed at both ends of the substantially I-shaped core, and positioning projections are formed on these air gap forming members so as to project outward, and these positioning projections are fitted. 2. The electromagnetic device according to claim 1, wherein the positioning recesses are formed so as to face the inner surface of the square core.