JP2007281217A - Magnetic core - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic core which has excellent magnetic characteristics and has a conducting line wound therearound. <P>SOLUTION: The core is obtained by integrally injection molding a winding part 40 having a circular cross section, coil frames 41 provided at both ends of the winding part 40 as an example of a winding holder for holding the shape of a winding line 43 wound around the winding part 40, and connections 42a provided on the coil frame 41 to be connected to another member. The coil frames 41 are provided so that side surfaces of the winding part 40 are preferably tilted toward the connections 42a. The winding part 40, the winding holder 41 and the connections 42a are made of preferably metallic glass. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a magnetic core around which a conducting wire is wound.

FIG. 6 is a diagram for explaining a magnetic core used in a conventional electronically controlled mechanical timepiece, voltage conversion transformer, or the like. Here, FIG. 6A is a diagram simply showing an example of a conventional method of manufacturing a magnetic core, and FIG. 6B is a schematic perspective view showing a state in which a conducting wire is wound around the conventional magnetic core. 6 (c) is a sectional view taken along the line DD of FIG. 6 (b). As shown in FIG. 6A, the conventional magnetic core is formed by pressing and laminating a permalloy plate material or an amorphous thin plate and setting coil frames on both ends of the laminated material. And as shown in FIG.6 (b), (c), after winding the insulating tape around the formed magnetic core, the conducting wire was wound. Conventionally, there has also been proposed an invention in which a magnetic core used in an electronically controlled mechanical timepiece, a voltage conversion transformer or the like is made of metal glass (see Patent Documents 1 and 2).
JP-A-11-71648 Japanese Patent Laid-Open No. 11-74111

However, since the magnetic core used in the conventional electronically controlled mechanical timepiece, voltage conversion transformer, and the like is obtained by pressing and laminating a permalloy plate material or an amorphous thin plate, a cross-sectional view taken along line EE in FIG. As shown in FIG. 7A, there is a problem that a space is generated between the plate materials, and the demagnetizing field generated in this space deteriorates the magnetic characteristics of the magnetic core. Further, the magnetic core used in a conventional electronically controlled mechanical timepiece or voltage conversion transformer is connected to another member as shown in FIG. 7B, which is a diagram in which the conventional magnetic core is connected to another member. There are irregularities in the portion for this purpose. For this reason, there is a problem that a space is generated at the boundary between the magnetic core and another member, and the demagnetizing field generated in this space deteriorates the magnetic characteristics of the magnetic core.
Further, Patent Documents 1 and 2 describe that the magnetic core is formed of metal glass, but the shape of the magnetic core is not described, and the above-described problem cannot be solved.
Then, an object of this invention is to provide the magnetic core excellent in the magnetic characteristic.

In the configuration of the present invention, the object is to provide a winding section having a circular cross section, a winding holding section that is provided at both ends of the winding section, and holds the shape of the conductor wound around the winding section, This is achieved by a magnetic core characterized in that a connecting portion provided in the winding holding portion and connected to another member is integrally formed by injection molding.
In the said structure, since the cross section of a winding part is circular shape, there is no corner. For this reason, in the said structure, a conducting wire can be arranged and wound to a coil | winding part. Moreover, in the said structure, even if a conducting wire is wound around a coil | winding part, a conducting wire will be damaged by a corner and it will not be disconnected. Moreover, in the said structure, when a conducting wire is coat | covered, this insulation coating can tear at the corner | angular part of a coil | winding part, and it can prevent that a conducting wire and a coil | winding part contact and short-circuit. Therefore, according to the said structure, in order to prevent the short circuit mentioned above, when winding a conducting wire around a winding part, it is not necessary to coat | cover a winding part with an insulating tape. For this reason, according to the said structure, the distance between a coil | winding part and conducting wire can be shortened by the part of an insulating tape, and a magnetic characteristic can be improved by that much.

Moreover, in the said structure, it is preferable that the said winding holding | maintenance part inclines the side surface by the side of the said winding part to the said connection part side.
According to the above configuration, the side surface of the winding holding portion of the winding holding portion is tapered, and when the conducting wire is wound around the winding portion, the conducting wire is prevented from being caught by the winding holding portion and being disconnected. Is possible. In addition, when the side surface of the winding holding part side of the winding holding part is inclined to the connection part side, this winding holding part can be used as a drawing taper when the magnetic core is injection-molded, and the process when the magnetic core is injection-molded Can be made easier. In addition, when using this as a drawing taper, it is preferable that a coil | winding holding | maintenance part shall be 2 times or more of the diameter of a coil | winding part cross section.

The said structure WHEREIN: The said connection part is a comb-tooth shape, It is preferable to connect by fitting with another comb-tooth-shaped member.
According to the above configuration, when the other member is formed in a comb-like shape, the connection portion of the magnetic core and the other member can be fitted and connected, and the connection portion between the magnetic core and the other member can be connected. It is hard to produce space in. Therefore, it is possible to prevent the magnetic field characteristics from being deteriorated due to the demagnetizing field generated in the space between the connecting portion and the other member.

The said structure WHEREIN: It is preferable that the said coil | winding part, the said coil | winding holding | maintenance part, and the said connection part consist of metal glass.
According to the above configuration, the space factor (the volume of the space in the winding part / the total volume of the winding part) indicating the proportion of the space in the winding part becomes approximately 100%, and the space inside the winding part. It is possible to prevent the magnetic field characteristics from being deteriorated due to the demagnetizing field generated in the above. The magnetic properties of the metal glass itself are equal to or better than those of a permalloy plate or an amorphous thin plate. Therefore, when the magnetic core according to the embodiment of the present invention is made of metal glass, the magnetic field characteristics can be improved from the viewpoint of the magnetic characteristics of the metal glass itself.

In the above configuration, it is preferable that the winding portion is covered with an oxide film.
According to the said structure, the short circuit by a winding part and conducting wire contacting is prevented.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. In the following, the magnetic core according to the embodiment of the present invention will be described using an electronically controlled mechanical timepiece that is an example in which the magnetic core according to the embodiment of the present invention can be suitably used. In addition to the electronically controlled mechanical timepiece, it can be used for a watch motor magnetic core, a motor magnetic core for an electric vehicle, a voltage conversion transformer, an antenna core material, a magnetic sensor, and the like.

FIG. 1 is a plan view schematically showing an electronically controlled mechanical timepiece using a magnetic core according to an embodiment of the present invention.
In FIG. 1, the electronically controlled mechanical timepiece includes a barrel 1 composed of a mainspring, barrel barrel gear, barrel barrel true and barrel lid. The rotation of the barrel wheel is transmitted to the second wheel 6 and then increased in speed to the third wheel 7, from the third wheel 7 to the forty-fourth wheel (intermediate wheel) 9 via the second hand wheel 8, and The speed is sequentially increased and transmitted to the fourth wheel 10, the fifth wheel 11, the sixth wheel 12, and the rotor 13.

  This electronically controlled mechanical timepiece includes a generator 20 including a rotor 13, a stator 21, a first coil block 22, a second coil block 23, and a joint 24. The stator 21 forms a part of the magnetic circuit of the generator 20, and has an arrangement hole 21a in which the rotor magnet is arranged, so that the magnetic flux of the rotor 13 is interlinked. The first and second coil blocks 22 and 23 are obtained by winding coils around the magnetic cores 22a and 23a.

  In the above electronically controlled mechanical timepiece, the AC output from the generator 20 is boosted and rectified through a rectifier circuit including step-up rectification, full-wave rectification, half-wave rectification, transistor rectification, etc., and charged to a smoothing capacitor. A control circuit (not shown) that controls the rotation of the generator 20 with the electric power from the capacitor is operated. The control circuit is constituted by an integrated circuit (IC) including an oscillation circuit, a frequency dividing circuit, a rotation detection circuit, a rotation speed comparison circuit, an electromagnetic brake control means, and the like, and a crystal resonator is used for the oscillation circuit.

  Further, the method of winding the mainspring by rotating the square hole wheel 4 is performed via the kite wheel 31, the round hole wheel 32, and the square hole intermediate wheel 33 by operating the winding stem 30 connected to the crown not shown. At this time, the rotation direction of the square hole wheel 4 is regulated by the kojaze 4a. Similarly, the minute hand and the hour hand are adjusted by operating the winding stem 30 in the same manner through the pinion wheel 34, the small iron wheel 35, the minute intermediate wheel 36, and the minute wheel 37. The system is stopped by bringing the regulating lever 38 into contact with the fifth wheel & pinion 11. Since these mechanisms are similar to the well-known automatic or manual winding mechanism of a mechanical timepiece, further detailed description is omitted.

FIG. 2 is a diagram showing a magnetic core according to the embodiment of the present invention. FIG. 2 (a) is a schematic perspective view of the magnetic core according to the embodiment of the present invention, and FIG. 2 (b) is FIG. 2 (a). FIG. 2C is a cross-sectional view taken along the line BB of FIG. 2A. The magnetic core according to this embodiment is used as the magnetic cores 22a and 23a of the first and second coil blocks 22 and 23 described above.
The magnetic core according to the embodiment of the present invention is provided in a winding part 40, a coil frame 41 that is an example of a winding holding part, and a coil frame 41 that is an example of a winding holding part, and is connected to the stator 21. The connecting portion 42a is integrally formed by injection molding.

Since the cross section of the winding part 40 is circular, there is no corner. For this reason, according to the embodiment of the present invention, the conducting wire 43 can be aligned and wound around the winding portion 40.
In addition, according to the embodiment of the present invention, even if the conducting wire 43 such as a Cu wire is wound around the winding portion 40, the conducting wire 43 is not damaged by the corners and disconnected.
Further, according to the embodiment of the present invention, even when the conductive wire 43 such as a Cu wire is covered with an insulating coating made of Uremet, the insulating coating is torn at the corners of the winding portion 40, and the conductive wire 43 and the coil | winding part 40 can contact, and it can prevent that the generator 20 is short-circuited. Therefore, according to the magnetic core according to the present embodiment, it is not necessary to cover the winding portion 40 with the insulating tape when the conductive wire is wound around the winding portion 40 in order to prevent the above-described short circuit. For this reason, according to the magnetic core which concerns on this Embodiment, the distance between the coil | winding part 40 and the conducting wire 43 can be shortened by the part of an insulating tape, and a magnetic characteristic can be improved. However, also in the magnetic core according to the present embodiment, in order to prevent a short circuit due to the contact between the winding portion 40 and the conductive wire 43, the winding portion 40 is subjected to surface oxidation treatment and an oxide insulating film (not shown). Can be formed. In this case, if the thickness of the oxide insulating film is set to several μm, it is possible to prevent a decrease in magnetic field characteristics due to an increase in the distance between the winding portion 40 and the conductive wire 43.

  The coil frame 41 is provided at both ends of the winding part 40 and maintains the shape of the conducting wire 43 wound around the winding part 40. Here, the side surface of the coil frame 41 on the winding portion 40 side is inclined toward the connection portion 42a. In this way, the side surface of the coil frame 41 on the winding portion 40 side is tapered, and the winding portion When the conductive wire 43 is wound around 40, it is possible to prevent the conductive wire 43 from being caught by the coil frame 41 and being disconnected. When the side surface of the coil frame 41 on the winding portion 40 side is inclined toward the connection portion 42a, the coil frame 41 can be used as a drawing taper when the magnetic core is injection-molded, and the process when the magnetic core is injection-molded Can be made easier. In addition, when using this as a taper taper, it is preferable that the coil frame 41 shall be 2 times or more of the diameter of the cross section of the winding part 40.

FIG. 3 is a diagram showing an example (part 1) of connecting the magnetic core according to the embodiment of the present invention to another member.
As shown in FIG. 3, in the magnetic core according to the embodiment of the present invention, the connection portion 42 a provided in the winding portion 40 is connected to another member such as the stator 21 using the joint 24 or the like. Can do. In the example shown in FIG. 3, the connection portion 42 a and other members are butted and connected. However, in the embodiment of the present invention, the magnetic core is formed by injection molding, so the cross-section of the connection portion 42 a is used. There are few unevenness | corrugations, and it is hard to produce space between the connection part 42a and another member. For this reason, according to this Embodiment, the fall of the magnetic field characteristic by the demagnetizing field produced in the space between the connection part 42a and another member can be prevented.

FIG. 4 is a diagram showing an example (part 2) of connecting the magnetic core according to the embodiment of the present invention to another member.
As shown in FIG. 4, in the embodiment of the present invention, the shape of the connection portion 42 b included in the magnetic core can be formed in a comb shape. In this way, by forming other members such as the stator 21 in a comb-teeth shape, the connecting portion 42b of the magnetic core and the other member such as the stator 21 can be fitted and connected to each other. It is difficult to create a space between the portion 42b and other members such as the stator 21. Therefore, also in the example shown in FIG. 4, it is possible to prevent the magnetic field characteristics from being deteriorated due to the demagnetizing field generated in the space between the connecting portion 42b and the other member.

The material of the magnetic core according to the embodiment of the present invention described above is not particularly limited, but is preferably metallic glass. Here, metallic glass refers to bulk amorphous metal. When this metallic glass is cooled, the state changes from a liquid to a solid, and at this time, an amorphous state called a supercooled liquid exists. That is, when the metallic glass in a liquid state is cooled, it becomes crystalline, but when this is further cooled, it becomes an amorphous state called a supercooled liquid, and when this is further cooled, it becomes a solid. Here, the difference between the temperature when changing from the crystalline state to the amorphous state of the supercooled liquid and the temperature when changing from the amorphous state of the supercooled liquid to the solid state is: It becomes about 30 degrees or more. When the magnetic core according to the embodiment of the present invention is constituted by such a metallic glass, a space factor indicating the proportion of space in the winding portion 40 (the volume of the space in the winding portion 40 / the entire winding portion 40). Product) is approximately 100%, and a decrease in magnetic field characteristics due to a demagnetizing field generated in the space inside the winding portion 40 can be prevented.
The magnetic properties of the metal glass itself are equal to or better than those of permalloy plates and amorphous thin plates. Therefore, when the magnetic core according to the embodiment of the present invention is made of metal glass, the magnetic field characteristics can be improved from the viewpoint of the magnetic characteristics of the metal glass itself.

FIG. 5 is a diagram showing an example of a method of manufacturing a magnetic core according to the embodiment of the present invention.
Hereinafter, an example of a method for manufacturing a magnetic core according to an embodiment of the present invention will be described with reference to FIG.
First, a mold is prepared in which a cavity S having a shape of a magnetic core according to the embodiment is defined by an upper mold 50 and a lower mold 51 in a vacuum chamber.
Next, a metallic glass mother alloy 55 is inserted into the sleeve 52 around which the heating coil 53 is wound.
Next, an electric current is passed through the heating coil 53 to heat the metallic glass mother alloy 55 in the sleeve 52 to a supercooled liquid state.
Next, the mother glass 55 in the supercooled liquid state is filled into the cavity S with the plunger 54.
Next, the metallic glass filled in the cavity S is cooled.
Next, the upper mold 50 and the lower mold 51 are opened.
Next, the part which becomes a coil frame is pushed with the ejector 56, and the injection-molded magnetic core is removed.

  In addition, the magnetic core which concerns on embodiment of this invention demonstrated above is comprised integrally by injection molding, and is one part. Therefore, according to the embodiment of the present invention, the cost can be reduced as compared with the case where the winding portion 40, the coil frame 41, and the like are separately configured.

  The present invention is not limited to the above-described embodiment. Each configuration of each embodiment can be appropriately combined or omitted, and can be combined with other configurations not shown.

The top view which shows the outline of the electronically controlled mechanical timepiece using the magnetic core which concerns on embodiment of this invention. The figure which shows the magnetic core which concerns on embodiment of this invention. The figure which shows the example (the 1) of connecting the magnetic core which concerns on embodiment of this invention to another member. The figure which shows the example (the 2) of connecting the magnetic core which concerns on embodiment of this invention to another member. The figure which shows an example of the manufacturing method of the magnetic core which concerns on embodiment of this invention. The figure explaining the magnetic core used with the conventional electronically controlled mechanical timepiece, a voltage conversion transformer, etc. The figure explaining the conventional magnetic core.

Explanation of symbols

1 ... barrel wheel, 4 ... square hole wheel, 4a ... kohaze, 6 ... second wheel, 7 ... third wheel, 8 ... second hand wheel, 9 ... forty 4th car (intermediate car) 10 ... 4th car, 11 ... 5th car, 12 ... 6th car, 13 ... rotor, 20 ... generator, 21 ... stator , 21a: arrangement hole, 22a, 23a ... magnetic core, 22 ... first coil block, 23 ... second coil block, 24 ... joint, 30 ... winding stem, 31 ... -Kitchi wheel, 32 ... round hole car, 33 ... square hole intermediate car, 34 ... zipper wheel, 35 ... small iron wheel, 36 ... backside intermediate car, 37 ... Sun reverse wheel, 38 ... regulating lever, 40 ... winding part, 41 ... winding holding part, 42a, 42b ... connecting part, 43 ... conductor, 50 ... upper mold , 51 ... Lower mold, 52 ... Su Over Bed, 53 ... coil, 54 ... plunger, 55 ... metal glass master alloy, 56 ... ejector

Claims (5)

A winding section having a circular cross section;
A winding holding part that is provided at both ends of the winding part and holds the shape of the conductive wire wound around the winding part;
A connecting portion provided in the winding holding portion and connected to another member;
A magnetic core characterized in that is integrally formed by injection molding.   2. The magnetic core according to claim 1, wherein a side surface of the winding holding portion is inclined toward the connection portion.   3. The magnetic core according to claim 1, wherein the connection portion has a comb-like shape and is connected by being fitted to another comb-like member.   The magnetic core according to claim 1, wherein the winding portion, the winding holding portion, and the connection portion are made of metal glass.   The magnetic core according to claim 1, wherein the winding portion is covered with an oxide film.

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