JP2000077245A - Electromagnetic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic equipment for preventing its dimensions from increasing, and for accurately detecting the temperature at the mounting a thermosensitive protective device. SOLUTION: A primary coil 15 and a secondary coil 20, in which an electric wire 22 is wound around a resin bobbin 16 are mounted on an iron core 5 equipped with a leakage magnetic path in this electromagnetic equipment, and the electromagnetic equipment is provided with a protecting device for detecting the temperature of the primary coil and the secondary coil, and for interrupting currents which run through the coils, when the detected temperature reaches an abnormal temperature. A flange 17 of the faced bobbins of the primary coil and the secondary coil projecting in the laminated thickness direction of the iron core is provided with a notched part 30, in which coil faces 33 an electric wire wound around the electric wire winding parts of the bobbins are exposed, and a protecting device 25 is arranged close or adjacent to the faced coil faces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device such as a ballast for a discharge lamp having a protection device for detecting a thermal abnormality generated in a coil.

[0002]

2. Description of the Related Art Conventionally, electromagnetic devices such as ballasts for discharge lamps shown in FIGS. 6 and 7 are generally known. First, a ballast for a discharge lamp according to a first related art will be described with reference to FIG.

The ballast for a discharge lamp is provided with a thermal protection device for detecting abnormal heat generation of the two coils, respectively. The primary coils 15 and 2 are attached to an iron core 5 provided with a leakage magnetic path.
The secondary coil 20 is mounted, and these primary coils 15 and 2
The tape 14 is wound around and fixed to the outermost periphery of the coil of the next coil 20.

A core 5 provided with a leakage magnetic path includes a central leg core 6 in which a substantially I-shaped iron plate having a pair of leakage magnetic path projections 7, 7 forming a leakage magnetic path on both sides of the center is laminated. A pair of side leg cores, each of which is formed by laminating substantially U-shaped iron plates having leakage magnetic path protrusions 11, 11 disposed on both sides of the center leg core 6 and protruding inward toward the center to form a leakage magnetic path. 10 and 10. The primary coil 15
And the secondary coil 20 are respectively inserted from both ends of the center leg core 6, and cover the outer circumferences of the primary coil 15 and the secondary coil 20, and come into close contact with both ends of the center leg core 6 to form a pair of sides. Leg iron cores 10 and 10 are arranged. Further, both ends of the center leg iron core 6 and the pair of side leg iron cores 10, 10 are fixed by a pair of box-shaped caps 4, 4.

The primary coil 15 has flange portions 1 at both ends.
An electric wire winding part of a bobbin 16 made of a resin molded article having an electric wire winding part 18 having 7, 7 and an insertion hole (not shown) formed on the center line along the longitudinal direction and into which a center leg iron core is inserted. The electric wire 22 is formed by multi-layer winding of the part 18.

[0006] The secondary coil 20 is, like the primary coil,
A bobbin 16 made of a resin molded product having an electric wire winding portion 18 having flange portions 17 at both ends and an insertion hole (not shown) formed on a center line along the longitudinal direction and into which a center leg iron core is inserted. The electric wire 22 is formed by multiply winding the electric wire 22 around the electric wire winding portion 18.

[0007] A thermal protection device 25 for detecting abnormal heat generation of the primary coil 15 and the secondary coil 20 comprises a primary coil 15 and a secondary coil 20.
The secondary coils 20 are closely attached along the longitudinal side ends of the secondary coils 20 and are mounted and mounted on the side leg iron cores 10.
That is, the thermal protection device 25 is attached near the iron core 5, conducts the temperature of the coil outer peripheral surface, detects thermal abnormality of the coil, and shuts off the input side circuit.

The thermal protection device 25 is of a temperature detection type, and includes, for example, a non-return type thermal fuse which does not return once it has blown, or a return type thermal protector which repeats ON / OFF many times. It is used.

Next, a ballast for a discharge lamp according to a second prior art will be described with reference to FIG.

The ballast for a discharge lamp has the same configuration as that of the ballast for a discharge lamp according to the first prior art, in which a primary coil 15 and a secondary coil 20 are mounted on an iron core 5 provided with a leakage magnetic path. ,
Tapes 14 and 14 are closely wound around the outermost circumferences of the primary coil 15 and the secondary coil 20, and the outer circumferences of the primary coil 15 and the secondary coil 20 are fixed.

As shown in FIG. 7 (B), one thermal protection device 25 is attached to the primary coil 15 and the secondary coil 20 attached to the iron core 5 so as to straddle the outermost circumference of the coil. It is attached to the upper part in the longitudinal direction of the coil 15 and the secondary coil 20.

Also in this case, as in the first prior art, 1
By transmitting the temperatures of the outer peripheral surfaces of the secondary coil and the secondary coil, thermal abnormality of the coil can be detected, and the input side circuit can be cut off.

[0013]

As described above, since the resin molded product is used for the bobbin 16 of the conventional ballast for a discharge lamp, the flange portions 17, 17 of the bobbin are formed on the opposite leg iron core 10. , 10 are generally formed so as to protrude more than the outermost circumferences of the primary coil 15 and the secondary coil 20 for reasons such as maintaining an insulation distance between the primary coil 15 and the secondary coil 20.

Therefore, as shown in the first prior art, the thermal protection device 25 has a length L1 of the thermal protection device 25 even if it has a structure in which it is closely attached to the outermost periphery of the coil and is mounted on the side leg iron core. As shown in FIG. 8, when the coil winding width L2 is larger than the coil winding width L2, the flange portions 17, 17 of the bobbin hinder the heat-sensitive protection device 25 from being attached to the outermost periphery 15a of the coil.

In other words, as shown in FIG. 9, the thermal protection device 25 has a gap between itself and the insulating tape 14 wound around the outermost periphery of the electric wire made of a multilayered copper wire around the electric wire winding portion. t occurs and hinders the close contact with the primary coil 15 or the secondary coil 20 for detecting an abnormal temperature, and the heat generated inside the primary coil 15 or the inside of the secondary coil 20 causes the heat-sensitive protection device. There is a problem that it takes time to transmit the current to the coil 25, and the abnormal temperature of the coil cannot be detected quickly.

As shown in FIG. 7, a thermal protection device 25 is provided near the center in the longitudinal direction of the ballast for the discharge lamp so that the outermost periphery 15a of the primary coil and the outermost periphery 20a of the secondary coil are simultaneously contacted. When mounting, the height of the electromagnetic device is increased by the dimension A, which is the thickness of the thermal protection device to be mounted, and a cylindrical case (not shown) filled with resin or a caulking device used naked When storing electromagnetic equipment in a case (not shown) or the like, it is necessary to use a case in which the outer shape is made extra large by the height A of the thermal protection device 25, which is against the purpose of miniaturization. There was a problem that sometimes.

The present invention has been made in view of the above points, and does not increase the size when mounting a thermal protection device.
It is another object of the present invention to provide an electromagnetic device that can accurately detect temperature.

[0018]

According to a first aspect of the present invention, there is provided an electromagnetic apparatus according to the present invention, wherein a primary coil and a secondary coil each formed by winding an electric wire around a resin bobbin have a leakage magnetic field. An electromagnetic device equipped with a protection device that is mounted on an iron core provided with a path, detects the temperature of the primary coil and the secondary coil, and shuts off a current flowing through the coil when the detected temperature becomes abnormal. Notch portions where the coil surface of the electric wire wound around the electric wire winding portion of the bobbin is exposed are respectively opposed to flange portions of the bobbin opposite to the primary coil and the secondary coil projecting in the thickness direction of the iron core. And the protection device is arranged in close contact with or close to the exposed coil surface.

According to the second aspect of the present invention, there is provided an electromagnetic apparatus comprising:
The protection device is characterized in that the protection device is brought into close contact with the coil surface side where it is known that the temperature detection is required.

According to the third aspect of the present invention, there is provided an electromagnetic device comprising:
A multi-lamp type, in which two lamps are turned on simultaneously by one electromagnetic circuit, and three or more coils each formed by winding an electric wire around a resin bobbin are mounted on an iron core provided with a leakage magnetic path. In an electromagnetic device having a protection device for detecting temperatures of three or more coils and interrupting a current flowing in the coils when the detected temperature becomes an abnormal temperature, the three or more coils protruding in the thickness direction of the iron core. Notch portions for exposing a coil surface of an electric wire wound around the electric wire winding portion of the bobbin are provided on flange portions of the bobbin opposed to the coil, respectively, and the protection device is provided with the exposed coil. It is characterized by being arranged in close contact with or close to a surface.

According to a fourth aspect of the present invention, there is provided an electromagnetic device comprising:
The protection device is characterized in that the protection device is brought into close contact with the coil surface side where it is known that the temperature detection is required.

In the configuration of the first aspect, since the thermal protection device is in contact with the coil surface, which is the copper wire exposed portion of each coil, or is disposed near the coil surface, one or two thermal protection devices are provided. With the thermal protection device, it is possible to detect abnormal temperatures of the two coils.

According to the third aspect of the present invention, in a ballast for a discharge lamp having two or more coils, an abnormal temperature can be detected by a heat-sensitive protection device having less than the number of coils.

Further, as described in claim 2 or claim 4, when the coil to which the thermal protection device is to be mounted is clearly specified, it is possible to mount the thermal protection device in close contact with only the target coil. It is possible to detect the temperature with higher accuracy than before.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electromagnetic apparatus such as a ballast for a discharge lamp according to an embodiment of the present invention will be described with reference to FIGS. Note that the same parts as in the prior art will be described with the same reference numerals.

FIG. 2 shows a bobbin 16 used in the present invention. The bobbin 16 is formed of resin and is designed specifically for a structure of a magnetic circuit corresponding to a discharge lamp.

The resin bobbin 16 includes a wire winding portion 18 having flange portions 17 at both ends, and an insertion hole 19 formed on a center line along the longitudinal direction and into which a center leg iron core is inserted. Rectangular cutouts 30 are formed in the inner upper flange portion 17a, the inner lower flange portion 17b, and the outer lower flange portion 17c which do not directly contact the iron core.

Further, a terminal block 31 is integrally attached to the outer upper flange portion 17d, and six terminal plates 32 made of a conductive material are inserted into the terminal block 31 in parallel.

As shown in FIG. 3, when the copper wire 22 is wound in multiple layers around the wire winding portion 18 of the bobbin, as shown in FIG. Coil surface 3 consisting of a wide area up to the end of winding
3 is exposed.

The primary coils 15 and 2 thus configured
As shown in FIG. 1, the secondary coil 20 is formed between the opposed flange portions 17a, 17a between the primary coil 15 and the secondary coil 20 after being attached to the iron core 5 provided with the leakage magnetic path. The thermal protection device 25 is attached and fixed to the space portion 34. The pair of lead wires 26 extending from the end of the thermal protection device 25 fixed to the space 34 is soldered to terminal plates 32 inserted in the terminal block.

When attaching the thermal protection device 25 to the space portion 34, the coil surface 3 exposed from the notch formed on the opposite flange portion on both sides of the thermal protection device.
3 and 33 are attached to or close to each other.

The iron core 5 provided with the leakage magnetic path has a substantially I-shaped central leg having a pair of leakage magnetic path projections 7, 7 forming a leakage magnetic path on both sides at the center as in the prior art. A pair of substantially U-shaped side leg cores 10 having an iron core (not shown) and a leakage magnetic path convex portion 11 which is disposed on both sides of the central leg iron core and forms a leakage magnetic path formed to protrude inward at the center. , 1
0, the primary coil 15 and the secondary coil 20
Are inserted from both ends of the central leg iron core, and a pair of side leg iron cores arranged closely on both ends of the central leg iron core are arranged around the primary coil 15 and the secondary coil 20. At the same time, both ends of the center leg iron core 6 and the pair of side leg iron cores 10 are fixed by a pair of box-shaped caps 4 and 4, respectively.

At this time, the thermal protection device 25 comes into contact with the coil surfaces 33, 33 of the primary coil 15 and the secondary coil 20, or is arranged in the vicinity thereof.

Further, theoretically or experimentally, when an abnormality occurs,
If it is clear which of the primary coil 15 or the secondary coil 20 should detect the temperature of the coil and cut off the input circuit, the coil surface 33 of the target coil 15 or 20 whose temperature is to be detected is completely It may be adhered to and fixed to.

If necessary, a similar cut-out portion 30 is provided in the inner lower flange portion 17b located on the opposite side, if necessary, in the structure shown in FIG. It is possible to attach the thermal protection device to two places of the space part formed and the space part formed on the lower side, respectively, and it is possible to make close contact with the coil surface 33 composed of the copper wire of both the primary coil and the secondary coil. is there.

With the above configuration, the temperature of the coil surface formed in a wide range from the portion near the start of winding to the end of winding of the multilayer wound coil exposed in the cutout portion of the flange portion of the resin molding bobbin is detected. can do.

FIG. 5 shows another embodiment of a ballast for a discharge lamp. In this case, the ballast is a multi-lamp type in which two lamps are simultaneously turned on by one electromagnetic circuit.
After the coil 5, the secondary coil 20, and the tertiary coil 40 are mounted on the iron core 5a provided with the leakage magnetic path, the coil surface 33 made of a copper wire wound in multiple layers using the resin bobbin 16 having the same structure as described above is removed. It is exposed to the notch 30 formed in the flange. The resin bobbin 16 used for the secondary coil 20 does not have a terminal block attached thereto, and notches 30 are provided opposite to the upper flange portion of the bobbin. , 30 are exposed from the coil surfaces 33, 33 made of a copper wire wound in multiple layers.

The primary coil 15 configured as described above,
After the secondary coil 20 and the tertiary coil 40 are mounted on the iron core 5a provided with the leakage magnetic path, the primary coil 15, the secondary coil 20, and the tertiary coil 30 are provided between the opposed flange portions. Space portions 34, 34 are respectively formed, and cutout portions 30, 30 are respectively provided on opposite flange portions so as to face each other. The coil surface made of the wound copper wire is exposed, and the thermal protection device is attached and fixed in close contact with or close to the exposed coil surface.

Further, if it is theoretically or experimentally clear which of the plurality of coils should be detected and the input circuit should be cut off when there is an abnormality,
It may be fixed to a plurality of target coils whose temperature is desired to be detected by being in close contact therewith.

In such a circuit system in which three or more coils are mounted, the coil (here, a secondary coil) positioned so as to be sandwiched between the coils at both ends is formed by a flange cut. Two notches in one coil
It is configured so that the windings are exposed to enable temperature detection between adjacent coils.

If a similar notch is provided on the opposite flange as necessary, in the structure shown in FIG. 5, the thermal protection device is attached to all four spaces facing each coil. Becomes possible.

With the above configuration, it is possible to detect the temperature of the coil surface in a wide range from the portion near the beginning to the end of the winding of the multilayer wound coil exposed in the cutout formed in the flange portion of the resin molding bobbin. become.

The operation of the ballast for a discharge lamp according to the above embodiment will be described.

A notch is provided in a flange portion of a resin bobbin that does not directly contact an iron core provided with a leakage magnetic path to be mounted on a coil, and a copper wire of a coil wound around the bobbin in a multilayer is provided in the notch. Provide a coil surface that exposes

After the plurality of coils configured as described above are mounted on the iron core provided with the leakage magnetic path, the coil surface made of a copper wire exposed from the cutout portion of the flange portion in the space between the coils. , Or fix the thermal protection device so that it is placed in the vicinity.

At this time, according to the first aspect, the thermal protection device is in contact with the coil surface exposed from the cutout portion of the flange portion, or is disposed near the coil surface.

With the above configuration, it is possible to detect abnormal temperatures of two coils with one or two thermal protection devices.

According to the third aspect of the present invention, in a ballast for a discharge lamp having three or more coils, an abnormal temperature can be detected by a thermal protection device having fewer coils than the number of coils.

Further, when the coil to which the thermal protection device is to be mounted is clearly specified, it is possible to mount the thermal protection device in close contact with only the target coil.

Even when the heat-sensitive protection device is arranged near the coil and does not adhere to the coil, it is formed on the end face from the portion near the beginning of winding of the multilayer wound coil to the end of winding, which is exposed in the cutout portion of the flange portion of the resin molding bobbin. Since the temperature can be detected over a wide range of coil surfaces, it is possible to detect the temperature with higher accuracy than before.

If the temperature setting of the thermal protection device is set to a certain value, accuracy does not matter in particular.

[0052]

As described above in detail, according to the present invention, the abnormal temperature can be easily detected with a heat-sensitive protection device having less than the number of coils mounted on the iron core. Also, even when the same number of thermal protection devices as the number of coils are installed, a wide range of the end face from the portion near the beginning of winding of the multilayer wound coil to the end of winding of the multilayer wound coil exposed in the cutout portion of the flange portion of the resin molding bobbin. Temperature detection. From this, it is possible to detect the temperature with higher accuracy than before.

According to the third aspect of the present invention, in a ballast for a discharge lamp having three or more coils, an abnormal temperature can be detected by a thermal protection device having less than the number of coils.

As described in claim 2 or 4,
If the coil to which the thermal protection device is to be mounted is clear, it can be mounted in close contact with only the target coil.

[Brief description of the drawings]

FIG. 1 is a top view showing the appearance of an electromagnetic device according to a first embodiment of the present invention. (B) is a front view.

FIG. 2 is an exemplary perspective view showing the overall configuration of a bobbin of the electromagnetic device according to the first embodiment;

FIG. 3 is an exemplary perspective view showing a state where an electric wire is wound around a bobbin of the electromagnetic device according to the first embodiment;

FIG. 4 is an exemplary side view showing a state in which an electric wire is wound around a bobbin of the electromagnetic device according to the first embodiment;

5A and 5B show the appearance of an electromagnetic device according to a second embodiment of the present invention, and FIG. (B) is a front view.

FIG. 6 is a top view showing a state in which a thermal protection device is attached to each of coils of an electromagnetic device according to the related art. (B) is a front view.

FIG. 7 is a top view showing a state in which one thermal protection device is attached across a coil of an electromagnetic device according to the related art. (B) is a front view.

FIG. 8 shows a state in which one thermal protection device wider than the width of the flange portion of the coil of the electromagnetic device according to the related art is attached, and FIG. 8A is a top view. (B) is a front view.

FIG. 9 is a side view showing a state in which one thermal protection device wider than a flange portion of a coil of an electromagnetic device according to the related art is attached.

[Explanation of symbols]

 Reference numeral 5: an iron core provided with a leakage magnetic path; 5a: an iron core provided with a leakage magnetic path; 15: a primary coil; 16: a resin bobbin; 17: a flange portion; Coil, 22: electric wire, 25: protective device, 30: cutout portion, 33: coil surface.

Claims (4)

[Claims] A primary coil and a secondary coil each formed by winding an electric wire around a resin bobbin are mounted on an iron core provided with a leakage magnetic path, and the temperatures of the primary coil and the secondary coil are detected. In an electromagnetic device provided with a protection device for interrupting a current flowing through the coil when the detected temperature becomes abnormal, a flange portion of a bobbin opposed to the primary coil and the secondary coil projecting in the thickness direction of the iron core, Notch portions where the coil surface of the electric wire wound around the electric wire winding portion of the bobbin is exposed are provided to face each other, and the protection device is disposed in close contact with or close to the exposed coil surface. Characteristic electromagnetic equipment. 2. The electromagnetic device according to claim 1, wherein the protection device is brought into close contact with the coil surface side where it is known that the temperature detection is required. 3. A multi-lamp type in which two lamps are simultaneously turned on by one electromagnetic circuit, and three or more coils formed by winding an electric wire around a resin bobbin are mounted on an iron core provided with a leakage magnetic path. An electromagnetic device equipped with a protection device that is mounted on each of the coils and detects the temperature of each of the three or more coils, and shuts off the current flowing through the coils when the detected temperature becomes an abnormal temperature. Notch portions where the coil surface of an electric wire wound around the electric wire winding portion of the bobbin is exposed are respectively provided on flange portions of the bobbin opposed to the three or more coils, respectively, and the protection device is provided. An electromagnetic device, which is arranged in close contact with or close to the exposed coil surface. 4. The electromagnetic device according to claim 3, wherein the protection device is brought into close contact with the coil surface side where it is known that the temperature detection is required.