JP2017126599A - Magnetic circuit component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a loss in a diamagnetic field generation portion while ensuring stable inductance in a wide current range.SOLUTION: A magnetic circuit component of the present invention includes: a core 2 in which two E-type magnetic cores 4,5 are combined to face each other; a coil 3 wound about a central core 7 of the core 2; gaps 10 provided to tips of end cores 8,9 of the two E-type magnetic cores 4,5, respectively, and having high magnetic resistance; and a diamagnetic field generation device 12 provided to the central core 7 of the two E-type magnetic cores 4,5. The direction of a magnetic field generated by the coil 3 and the direction of a magnetic field generated by the diamagnetic field generation device 12 are opposite to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a magnetic circuit component used for a DC-DC converter, a filter, and the like.

  In a magnetic circuit component, for example, a DC reactor, as described in Patent Document 1, in order to have a stable inductance in a wide current range, a magnetic flux of a permanent magnet is applied in a direction opposite to a field magnetic flux. In addition, a configuration in which a magnet is disposed in the core gap portion is known. According to this configuration, saturation of the core can be avoided in a wide current range, and a stable and sufficiently large inductance can be obtained.

JP 2008-130945 A

  In a DC reactor that requires a large current and a large inductance, heat resistance and low loss are required as a magnet disposed in the core gap portion, and stability of magnetic characteristics is required under a demagnetizing field. When a ferrite magnet having a low coercive force is used as the magnet for the core gap portion, the stability of the magnetic characteristics cannot be ensured due to demagnetization due to heat or a demagnetizing field. In addition, when a sintered neodymium magnet having a high holding force is used, there is a problem that a large loss or heat generation occurs because the electric resistance of the magnet is low.

  The reason why such a large loss occurs is that the magnet is disposed in the entire coil gap, and therefore, most of the magnetic flux fielded by the coil is linked to the magnet. In addition, in the structure of patent document 1, although the loss which generate | occur | produces by high resistance of magnet material is suppressed, in the case of the said structure, the frequency of a coil current becomes large and the magnetic flux linked to a magnet increases. There is a problem that the loss increases as time goes by.

  An object of the present invention is to provide a magnetic circuit component capable of ensuring a stable inductance in a wide current range and suppressing a loss of a demagnetizing field generation portion.

  The invention of claim 1 is wound around a core (2) comprising two E-shaped magnetic core portions (4, 5) facing each other and a central core portion (7) of the core (2). The gap (10) provided at the tip of the coil (3) and the end cores (8, 9) of the two E-shaped magnetic cores (4, 5) and having a high magnetic resistance, and two Magnetic field generated by the coil (3), provided with a demagnetizing field generator (12, 15, 16, 17, 18) provided in the central core (7) of the E-type magnetic core (4, 5). And the direction of the magnetic field generated by the demagnetizing field generator (12, 15, 16, 17, 18) are opposite to each other.

Sectional drawing of the reactor which shows 1st Embodiment of this invention Exploded perspective view of the core The fragmentary perspective view of the E-type magnetic core part which shows 2nd Embodiment of this invention The figure which shows the state which accommodated the permanent magnet in the groove part of the magnetic core part. The figure which shows 3rd Embodiment of this invention and shows the state which attached the permanent magnet to the E-type magnetic core part. Sectional drawing of the reactor which shows 4th Embodiment of this invention Electrical configuration of power converter The electrical block diagram of the power converter which shows 5th Embodiment of this invention Sectional drawing of the reactor which shows 6th Embodiment of this invention Sectional drawing of the reactor which shows 7th Embodiment of this invention

  Hereinafter, a first embodiment in which the present invention is applied to a reactor will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the reactor 1 of the present embodiment includes a core 2 and a coil 3. As shown in FIG. 2, the core 2 includes two E-type magnetic core portions 4 and 5. Each of the magnetic core parts 4 and 5 is made of, for example, an alloy of Fe and Si, an alloy of Fe, Si and Al, an amorphous of Fe, a magnetic core made of powder of an alloy of Fe and Si, or a magnetic core of non-compacted powder, Fe and Si, It is formed of a powder core or non-powder magnetic core made of Al alloy powder, a powder powder or non-powder magnetic core made of Fe amorphous powder, ferrite, or a laminated iron core.

  The E-shaped magnetic core portions 4 and 5 have the same shape, and as shown in FIG. 2, as shown in FIG. 2, the connecting core portion 6, the central core portion 7 provided in the central portion of the connecting core portion 6, and the connecting core portion 6 and end core portions 8 and 9 provided at both ends. The front end surface of the central core portion 7 of the magnetic core portion 4 and the front end surface of the central core portion 7 of the magnetic core portion 5 are brought into contact with each other, for example, and bonded, and the two end core portions 8 of the magnetic core portion 4 are bonded. , 9 and the two end core portions 8, 9 of the magnetic core portion 5 are opposed to each other with a predetermined gap 10 therebetween to constitute the core 2. Note that the gap 10 is a gap of about 1 mm, for example, and may be left as an air layer, a low magnetic permeability material with low electrical conductivity (such as a ceramic material or a resin material), or a low magnetic permeability with low electrical conductivity. You may comprise so that it may fill with a material.

  A coil 3 is wound around the central core portion 7 of the core 2. In this case, the coil 3 is wound around a bobbin (that is, a winding frame) (not shown), and the central core portion 7 of the core 2 is inserted into the through hole of the bobbin around which the coil 3 is wound. Has been. The coil 3 is configured so that the two magnetic core portions 4 and 5 are bonded and integrated while being inserted into the central core portion 7 of the two magnetic core portions 4 and 5 before being integrated. ing. A pair of lead lines are drawn out from the coil 3, and the pair of lead lines correspond to a pair of terminals of the reactor 1 and are connected to other electric elements of the power converter.

  Further, for example, a rectangular hole 11 is formed at the center of the distal end surface of the central core portion 7 of the two magnetic core portions 4 and 5 as shown in FIG. In the hole 11, a magnet as a demagnetizing field generator, for example, a rod-shaped permanent magnet 12 is accommodated. The depth of the hole 11 is such that half of the length of the permanent magnet 12 in the longitudinal direction is accommodated. Thereby, when the two magnetic core parts 4 and 5 are integrated, the permanent magnet 12 is embedded in the holes 11 of the two central core parts 7.

  In the case of this configuration, when a direct current is applied to the coil 3 in the current direction shown in FIG. 1, a magnetic flux having two closed magnetic paths, that is, a magnetic field 13 is generated in the core 2 as indicated by solid arrows. To do. The permanent magnet 12 is disposed so as to generate a magnetic field 14 in a direction opposite to the magnetic field 13 of the coil 3 (that is, a direction indicated by a broken arrow), and the upper end of the permanent magnet 12 in FIG. The lower end in FIG. 1 is an S pole. The permanent magnet 12 is a magnet formed of a material having a high electrical resistance and a magnetic permeability lower than that of the core 2, and is composed of, for example, a neodibond magnet or a ferrite magnet. Yes.

  In the case of the above configuration, the magnetic flux density B of the magnetic field 13 generated by the coil 3 in the core 2 is proportional to the strength H of the magnetic field 13, that is, B = μH. As the density increases and the distance from the coil 3 increases, the magnetic flux density decreases. For this reason, in the central core portion 7 of the magnetic core portions 4 and 5, the magnetic flux density is high at the peripheral portion close to the coil 3, and the magnetic flux density is low at the central portion far from the coil 3. Therefore, in the present embodiment, the permanent magnet 12 is arranged at the central portion of the central core portion 7 where the magnetic flux density by the coil 3 is low. According to this configuration, since the magnetic flux interlinked with the permanent magnet 12 is reduced, the loss of the permanent magnet 12 can be reduced. Further, in the present embodiment, since the permanent magnet 12 is formed of a material having a low electric resistance, loss generated in the permanent magnet 12 can be reduced. In addition, in the present embodiment, the permanent magnet 12 is formed of a material whose permeability is lower than the permeability of the core 2, so that the magnetic flux generated by the coil 3 easily passes through the core 2 and hardly passes through the permanent magnet 12. Therefore, the loss generated in the permanent magnet 12 can be reduced.

  Further, the length dimension L1 of the permanent magnet 12 in the vertical direction in FIG. 1 is configured to be equal to or less than the length dimension L2 of the coil 3 in the vertical direction in FIG. 1 (that is, the axial direction of the coil 3). Yes. When L1 is longer than L2, the magnetic field 13 of the coil 3 and the magnetic field of the permanent magnet 12 are in the same direction in the portion of the permanent magnet 12 longer than L2, and the saturation of the core 2 is promoted. A malfunction occurs. In the present embodiment, the occurrence of the above-described problems is prevented by configuring L1 ≦ L2.

  The area of the front end surface of the central core portion 7 of the magnetic core portions 4 and 5 (that is, the cross-sectional area of the central core portion 7) is S1, and the front end surfaces of the end core portions 8 and 9 of the magnetic core portions 4 and 5 are used. , Where S1 ≧ S2 + S3 is established, where S2 and S3 are the respective areas (that is, the cross-sectional areas of the end core portions 8 and 9). In the present embodiment, since S2 = S3, S1 ≧ 2S2 is established. And if comprised in this way, in the central core part 7 of the magnetic core parts 4 and 5, the magnetic flux linked with the permanent magnet 12 can be decreased.

  In order to dissipate heat generated in the reactor 1, that is, heat generated by loss when the reactor 1 is driven, the reactor 1 is configured to be cooled by air cooling, natural air cooling, water cooling, or oil cooling. As a configuration for cooling the reactor 1, a heat radiating member made of a material having high thermal conductivity (for example, aluminum or copper) is disposed on one side surface or both side surfaces of the coil 3 of the reactor 1. The heat dissipating member is cooled by air cooling or a liquid lower than the temperature of the reactor 1 (for example, water or oil). An insulating layer having high thermal conductivity is formed between the surface of the heat radiating member that contacts the coil 3 (that is, the cooling surface) and the side surface or both side surfaces of the coil 3. The thickness of this insulating layer is, for example, about several μm to several mm. The voltage applied to the coil 3 by the insulating layer can be prevented from being discharged to the cooling surface of the heat radiating member, and when the flatness of the side surface of the coil 3 is low, the insulating layer is used to The contact property with the side surface of the coil 3 can be improved.

  In the present embodiment having the above-described configuration, the permanent magnet 12 is arranged in the central portion of the central core portion 7 where the magnetic flux density by the coil 3 in the core 2 is low, that is, in the portion away from the coil 3. According to this configuration, since the magnetic flux interlinking with the permanent magnet 12 is reduced, the loss generated in the permanent magnet 12 can be reduced.

  In the above embodiment, the coil 3 is wound only around the central core portion 7 of the core 2, but the present invention is not limited to this, and the coil is also wound around the end core portions 8 and 9 where the gap 10 exists. You may comprise so that it may rotate.

(Second Embodiment)
3 and 4 show a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the second embodiment, a rectangular groove portion 14 penetrating in the vertical direction in FIGS. 3 and 4 is formed in the central core portion 7 of the two magnetic core portions 4 and 5 in place of the hole 11. When the two magnetic core portions 4 and 5 are integrated, the plate-like permanent magnet 15 is inserted into the groove portion 14 of the two central core portions 7 (that is, the portion away from the coil 3). It is configured to fill the interior.

  The configurations of the second embodiment other than those described above are the same as the configurations of the first embodiment. Therefore, in the second embodiment, substantially the same operational effects as in the first embodiment can be obtained.

(Third embodiment)
FIG. 5 shows a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment or 2nd Embodiment. In the third embodiment, the formation of the holes 11 and the groove portions 14 in the central core portions 7 of the two magnetic core portions 4 and 5 is stopped, and the groove portions on the upper and lower surfaces of the central core portion 7 in FIG. For example, thin plate-like permanent magnets 16 and 17 were attached to a portion corresponding to 14 (that is, a portion away from the coil 3) by bonding. In the case of this configuration, it is preferable that the permanent magnets 16 and 17 are bonded to the upper and lower surfaces of the two central core portions 7 after the two magnetic core portions 4 and 5 are integrated.

  The configuration of the third embodiment other than that described above is the same as the configuration of the first embodiment or the second embodiment. Therefore, also in the third embodiment, substantially the same effect as the first embodiment or the second embodiment can be obtained.

(Fourth embodiment)
6 and 7 show a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In this 4th Embodiment, it comprised so that the electromagnet 18 might be accommodated instead of the permanent magnet 12 in the hole 11 of the center core part 7 of the two magnetic core parts 4 and 5. FIG. In the case of this configuration, as shown in FIG. 6, when a direct current is applied to the coil 3, a magnetic field 13 is generated in the core 2 as indicated by a solid arrow. Therefore, the electromagnet 18 is configured to generate a magnetic field 14 in a direction opposite to the magnetic field 13 of the coil 3 (that is, a direction indicated by a broken arrow), that is, to be energized in the direction shown in FIG. Yes. When the coil 3 is energized in the direction opposite to that of FIG. 6, the electromagnet 18 is also energized in the direction opposite to that of FIG.

  The electromagnet 18 is composed of an auxiliary coil wound around a bobbin and an auxiliary core housed inside the bobbin. The auxiliary core of the electromagnet 18 may be made of substantially the same material as the core 2 of the reactor 1 (that is, a non-conductive material), or may be made of a soft magnetic material. Although it is good, it is preferable that the permeability of the auxiliary core for the electromagnet 18 is lower than the permeability of the core 2. If comprised in this way, while being able to reduce the loss which generate | occur | produces in the auxiliary | assistant core of the electromagnet 18, the magnetic flux which passes the inside of the auxiliary | assistant core of the electromagnet 18 can be decreased.

Further, the length L1 of the electromagnet 18 in the vertical direction in FIG. 6 is configured to be equal to or less than the length L2 of the coil 3 in the vertical direction in FIG.
FIG. 7 is a diagram showing an electrical configuration of a power converter (for example, a boost converter) 19 incorporating the reactor 1 of the present embodiment. For example, when the power converter 19 is mounted on a hybrid vehicle, the battery voltage is boosted, and the operation mode that operates in a power running state for driving the motor / generator and the regeneration voltage of the motor / generator are stepped down. Thus, an operation mode that operates in a regenerative state in which the battery is charged is configured to be executable.

  As shown in FIG. 7, the power converter 19 is configured by connecting a first capacitor 20, a reactor 1, a first IGBT 21, a second IGBT 22, and a second capacitor 23 as illustrated. Input terminals 24 and 25 of the power converter 19 are connected to a battery, and output terminals 26 and 27 of the power converter 19 are connected to a motor / generator.

  The power converter 19 includes an energizing circuit 29 that energizes the auxiliary coil 28 of the electromagnet 18 of the reactor 1, and the polarity of the terminal 3 a that is connected to the input terminal 24 in the coil 3 of the reactor 1, that is, the current that flows through the coil 3 And a polarity discriminating circuit 30 for discriminating the polarity of the average current. The polarity discrimination circuit 30 outputs the polarity discrimination result of the terminal 3a to the energization circuit 29. The energization circuit 29 energizes the auxiliary coil 28 of the electromagnet 18 in the energization direction shown in FIG. 6 when the polarity discrimination result from the polarity discrimination circuit 30 matches the energization direction of the average current of the coil 3 shown in FIG. It is configured. The energizing circuit 29 energizes the auxiliary coil 28 of the electromagnet 18 shown in FIG. 6 when the polarity discrimination result from the polarity discriminating circuit 30 is opposite to the energizing direction of the average current of the coil 3 shown in FIG. It is configured to energize in the direction opposite to the direction.

  The configurations of the fourth embodiment other than those described above are the same as the configurations of the first embodiment. Therefore, also in the fourth embodiment, substantially the same operational effects as in the first embodiment can be obtained. In particular, in the fourth embodiment, the direction of energization of the coil 3 of the reactor 1 when the power converter 19 is driven is detected, and the direction of energization of the auxiliary coil 28 of the electromagnet 18 is switched according to the detection result. In both the operation mode and the regenerative operation mode, stable inductance can be ensured.

  In the fourth embodiment, the electromagnet 18 is accommodated in the hole 11 of the central core portion 7 of the two magnetic core portions 4 and 5. However, the present invention is not limited to this. For example, instead of the permanent magnet 15, an electromagnet may be accommodated in the groove portion 14 of the central core portion 7 of the two magnetic core portions 4 and 5 of the second embodiment. Further, instead of the permanent magnets 16 and 17, electromagnets may be bonded and attached to the upper and lower surfaces in FIG. 5 of the central core portion 7 of the third embodiment.

  In the fourth embodiment, the electromagnet 18 is accommodated in the hole 11 of the central core portion 7 of the magnetic core portions 4 and 5, but instead of this, an air-core coil composed of an auxiliary coil and a bobbin. May be accommodated in the hole 11 of the central core portion 7.

(Fifth embodiment)
FIG. 8 shows a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 4th Embodiment. In the fifth embodiment, a polarity current value detection circuit 31 is provided instead of the polarity determination circuit 30. The polarity current value detection circuit 31 determines the polarity of the terminal 3 a on the side connected to the input terminal 24 of the coil 3 of the reactor 1 (that is, the polarity of the average current of the current flowing through the coil 3) and flows through the coil 3. The current value of the current (that is, the current value of the average current) is detected, and the polarity determination result and the current value detection result are output to the energization circuit 29.

  The energization circuit 29 switches the energization direction of the auxiliary coil 28 of the electromagnet 18 based on the polarity determination result from the polarity current value detection circuit 31 as in the fourth embodiment. In addition, the energization circuit 29 is configured to variably control the magnitude of the current energized to the auxiliary coil 28 of the electromagnet 18 based on the current value detection result from the polar current value detection circuit 31.

  In this case, when the current value of the current flowing through the coil 3 is smaller than a predetermined threshold, the energization circuit 29 determines that a large current is not energized and reduces the current energized to the electromagnet 18 to zero or smaller. It is configured.

  The configuration of the fifth embodiment other than that described above is the same as the configuration of the fourth embodiment. Accordingly, in the fifth embodiment, substantially the same operational effects as in the fourth embodiment can be obtained. In particular, in the fifth embodiment, the current value of the current flowing through the coil 3 is detected, and when the detected current value is smaller than a predetermined threshold value, the current supplied to the electromagnet 18 is configured to be zero or small. Therefore, the loss generated in the auxiliary coil 28 and the energizing circuit 29 of the electromagnet 18 can be reduced.

  In the fifth embodiment, the current value of the current flowing through the coil 3 of the reactor 1 is detected, and the magnitude of the current supplied to the electromagnet 18 is switched in two steps according to the detected current value. However, the present invention is not limited to this. For example, the magnitude of the current supplied to the auxiliary coil 28 of the electromagnet 18 may be finely controlled for each detected current value. Specifically, the inductance characteristic of the reactor 1 with respect to the current value of the coil 3 is previously mapped, and based on this map, the current value of the auxiliary coil 28 of the electromagnet 18 so that the inductance characteristic of the reactor 1 is always near the maximum. Is preferably determined. With this configuration, it is possible to secure stable inductance for the reactor 1 so as to correspond to the operating state of the power converter 19.

(Sixth embodiment)
FIG. 9 shows a sixth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 1st Embodiment. In the reactor 32 of this 6th Embodiment, it is comprised in the shape which connected the reactor 1 of 1st Embodiment, for example in the horizontal direction. The reactor 32 having such a shape is suitable for a configuration in which the height direction cannot be ensured due to mounting restrictions or a configuration in which a large cooling area of the core or coil is desired.

  The reactor 32 includes a connecting core 42 that is formed by connecting a pair of connecting magnetic core portions 41 each having a shape obtained by connecting a plurality of E-shaped magnetic core portions 4 in the lateral direction, and includes three central cores of the connecting cores 42. Three coils 3 are wound around the portion 7.

  Further, when manufacturing the three connected shapes, the three reactors 1 of the first embodiment may be connected in the horizontal direction, for example, by bonding, or the three E-shaped magnetic core portions 4 may be connected in the horizontal direction. Two connecting magnetic core portions 41 having a shape integrated with each other may be prepared, and the two connecting magnetic core portions 41 and 41 may be integrated to manufacture the connecting core 42 and thus the reactor 32. good.

  The configuration of the sixth embodiment other than that described above is the same as the configuration of the first embodiment. Therefore, in the sixth embodiment, substantially the same operational effects as in the first embodiment can be obtained.

  Moreover, in the said 6th Embodiment, although comprised in the shape which connected the reactor 1 of 1st Embodiment to the horizontal direction, it is not restricted to this, The 2 reactors 1 of 1st Embodiment are horizontal. You may comprise in the shape connected to 4 or the shape connected 4 or more laterally. Moreover, you may comprise in the shape which connected the reactor 1 of 1st Embodiment in the vertical direction, or the shape which connected 3 or more in the vertical direction.

(Seventh embodiment)
FIG. 10 shows a seventh embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same structure as 4th Embodiment or 6th Embodiment. The reactor 33 of this 7th Embodiment is comprised in the shape which connected the reactor 1 of 4th Embodiment, for example in the horizontal direction. The configuration of the seventh embodiment other than that described above is the same as the configuration of the fourth embodiment or the sixth embodiment. Therefore, also in the seventh embodiment, substantially the same operational effects as the configuration of the fourth embodiment or the sixth embodiment can be obtained.

  Moreover, in the said 7th Embodiment, although comprised in the shape which connected the reactor 1 of 4th Embodiment to the horizontal direction, it is not restricted to this, Two reactors 1 of 4th Embodiment are horizontal. You may comprise in the shape connected to 4 or the shape connected 4 or more laterally. Moreover, you may comprise in the shape which connected the reactor 1 of 4th Embodiment in the vertical direction, or the shape connected 3 or more in the vertical direction.

  In each of the above embodiments, the present invention is applied to the reactor. However, the present invention is not limited to this, and may be applied to other magnetic circuit components.

  In the drawings, 1 is a reactor (magnetic circuit component), 2 is a core, 3 is a coil, 4 is 5 a magnetic core part, 7 is a central core part, 8 and 9 are end core parts, 10 is a gap, and 11 is a hole. , 12 is a permanent magnet (demagnetizing field generator), 13 is a magnetic field, 14 is a groove, 15 is a permanent magnet (demagnetizing field generator), 16 is a permanent magnet (demagnetizing field generator), 17 is a permanent magnet (demagnetizing field generated) Device), 18 is an electromagnet (demagnetizing field generator), 19 is a power converter, 28 is an auxiliary coil, 29 is an energization circuit, 30 is a polarity discrimination circuit, 31 is a polarity current value detection circuit, 32 is a reactor (magnetic circuit component) ) And 33 are reactors (magnetic circuit components).

Claims (12)

A core (2) formed by combining two E-shaped magnetic core portions (4, 5) facing each other;
A coil (3) wound around a central core portion (7) of the core (2);
A gap (10) provided at the tip of the end cores (8, 9) of the two E-shaped magnetic cores (4, 5), and having a high magnetic resistance;
A demagnetizing field generator (12, 15, 16, 17, 18) provided in the central core (7) of the two E-shaped magnetic cores (4, 5),
A magnetic circuit component configured such that the direction of the magnetic field generated by the coil (3) is opposite to the direction of the magnetic field generated by the demagnetizing field generator (12, 15, 16, 17, 18).   The demagnetizing field generator (12, 15, 16, 17, 18) is formed from a central portion of the two E-type magnetic core portions (4, 5) in the central core portion (7) or from the coil (3). The magnetic circuit component according to claim 1, wherein the magnetic circuit component is disposed at a distant portion.   The magnetic circuit component according to claim 1 or 2, wherein the demagnetizing field generator (12, 15, 16, 17, 18) is made of a material having a magnetic permeability lower than that of the core (2).   The magnetic circuit component according to any one of claims 1 to 3, wherein the demagnetizing field generating device (12, 15, 16, 17, 18) is composed of a neodymium bond magnet or a ferrite magnet.   The magnetic circuit component according to any one of claims 1 to 3, wherein the demagnetizing field generator (12, 15, 16, 17, 18) includes an electromagnet (18) or an air-core coil.   By determining the direction of current flowing through the electromagnet (18) or the air-core coil from the polarity of the average current flowing through the coil (3), the direction of the magnetic field generated by the coil (3), The magnetic circuit component according to claim 5, wherein the direction of the magnetic field generated by the electromagnet (18) or the air-core coil is opposite.   Generated by the coil (3) by determining the direction and current value of the current flowing through the electromagnet (18) or the air-core coil from the polarity and current value of the average current flowing through the coil (3). The magnetic circuit component according to claim 6, wherein the direction of the magnetic field is opposite to the direction of the magnetic field generated by the electromagnet (18) or the air-core coil.   The current direction and the current value for energizing the electromagnet (18) or the air-core coil are configured so that the inductance is determined to be near the maximum based on the inductance characteristics of the magnetic circuit component. Magnetic circuit components.   The magnetic circuit component according to any one of claims 1 to 8, wherein the gap (10) is provided with a ceramic, an air layer, a resin, or a member having low electrical conduction.   The cross-sectional area of the central core part (7) of the E-shaped magnetic core part (4, 5) is configured to be at least twice the cross-sectional area of the end core part (8, 9). The magnetic circuit component according to any one of 1 to 9.   The longitudinal dimension of the demagnetizing field generator (12, 15, 16, 17, 18) is configured to be equal to or less than the axial dimension of the coil (3). The magnetic circuit component according to claim 10. A connecting core formed by confronting and combining a plurality of connecting magnetic core portions each having a shape in which a plurality of the E-shaped magnetic core portions (4, 5) are connected in the lateral direction;
The magnetic circuit component according to any one of claims 1 to 11, further comprising a plurality of coils (3) wound around a central core portion of the connecting core.

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