JP2020087567A - Electromagnet device, and electromagnetic relay - Google Patents

Abstract

To save weight.SOLUTION: A stationary member is made of a magnetic material. A movable member is made of a magnetic material and moves relative to the stationary member in accordance with generation of a first magnetic flux M1. A permanent magnet 58 generates a second magnetic flux M2. An auxiliary yoke 7 has: a first region 71 that faces a first face 61 which is a pole face of the permanent magnet 58 in a first direction; and a second region 72 that faces a second face which is a face of one of the stationary member and the movable member in a second direction. The second magnetic flux M2 passes through the first region 71 and the second region 72. The normal direction of the first face 61 and that of the second face 62 are different. The auxiliary yoke 7 has a low-permeability part 74 with smaller permeability than the first region 71 and the second region 72 in an area A1 where a projection area in the second direction of a face of the first region 71 that faces the first face 61 and a projection area in the first direction of a face of the second region 72 that faces the second face 62 overlaps with each other.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an electromagnet device and an electromagnetic relay, and more particularly to an electromagnet device including an exciting coil and a permanent magnet, and an electromagnetic relay including the electromagnet device.

Patent Document 1 describes an example of an electromagnet device and an electromagnetic relay equipped with the electromagnet device.

The electromagnet device described in Patent Document 1 includes a coil, a fixed-side member, a movable-side member, and a permanent magnet. The coil generates a first magnetic flux when energized. The fixed-side member allows the first magnetic flux to pass. The movable-side member is arranged to face the fixed-side member through the gap when the coil is not energized, and reciprocates so as to be attracted to the fixed-side member when the coil is energized. The permanent magnet generates a second magnetic flux. The permanent magnet is adjacent to the gap between the fixed-side member and the movable-side member when the coil is not energized, and is arranged at a position separated from the fixed-side member and the movable-side member with a space interposed therebetween.

In this electromagnet device, the direction of the second magnetic flux on the facing surfaces of the fixed-side member and the movable-side member is the same as the direction of the first magnetic flux on the facing surfaces of the fixed-side member and the movable-side member. .. As a result, the suction force of the movable member to the fixed member can be further improved.

JP, 2017-228517, A

In the field of electromagnet devices and electromagnetic relays, there is a demand for weight reduction.

An object of the present disclosure is to provide an electromagnet device that can be reduced in weight and an electromagnetic relay including the electromagnet device.

An electromagnet device according to an aspect of the present disclosure includes an exciting coil, a fixed member, a movable member, a permanent magnet, and an auxiliary yoke. The exciting coil generates a first magnetic flux when energized. The fixing member is made of a magnetic material. The movable member is made of a magnetic material. The movable member moves with respect to the fixed member in response to the generation of the first magnetic flux. The permanent magnet generates a second magnetic flux. The auxiliary yoke has a first portion and a second portion. The first portion faces a first surface, which is a magnetic pole surface of the permanent magnet, in a first direction. The second portion faces a second surface, which is one surface of the fixed member and the movable member, in the second direction. In the auxiliary yoke, the second magnetic flux passes through the first portion and the second portion. The normal direction of the first surface and the normal direction of the second surface are different. The auxiliary yoke has a projection area of a surface of the first portion facing the first surface in the second direction and a surface of the second portion facing the second surface in the first direction. The low magnetic permeability portion is provided in a portion where the projection area of and the projection area of are overlapped. The low magnetic permeability portion has a magnetic permeability smaller than that of the first portion and the second portion.

An electromagnetic relay according to an aspect of the present disclosure includes the electromagnet device, a fixed contact, a movable contact, and a drive shaft. The movable contact is movable between a position in contact with the fixed contact and a position away from the fixed contact. The drive shaft is connected to the movable member. The drive shaft moves the movable contact according to the movement of the movable member.

The electromagnet device and the electromagnetic relay according to the present disclosure can be reduced in weight.

FIG. 1 is a cross-sectional view of the electromagnetic relay according to the embodiment. FIG. 2 is an exploded perspective view of an electromagnet device included in the above electromagnetic relay. FIG. 3 is an explanatory diagram illustrating magnetic fluxes from a coil and a permanent magnet in the electromagnet device of the above. FIG. 4 is a sectional view of an auxiliary yoke included in the electromagnet device of the above. FIG. 5: is explanatory drawing explaining the magnetic flux from the permanent magnet in the electromagnet apparatus same as the above. FIG. 6 is a cross-sectional view of the main parts of the electromagnetic relay according to the first modification. FIG. 7 is a cross-sectional view of the main parts of the electromagnetic relay according to the second modification. FIG. 8: is sectional drawing of the principal part of the above-mentioned electromagnetic diameter electromagnetic.

(1) Embodiment Hereinafter, an electromagnet device and an electromagnetic relay according to the embodiment will be described with reference to the drawings. However, the following embodiment is only one of the various embodiments of the present disclosure. The following embodiments can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. Further, each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and the thickness of each constituent element in the drawings does not always reflect the actual dimensional ratio. ..

The electromagnetic relay 1 of the present embodiment is mounted on, for example, an electric vehicle, and is used by being connected to an electric path that connects a running battery of the electric vehicle and a load. The electromagnetic relay 1 electrically connects or disconnects between a running battery and a load in accordance with a control signal from an ECU (Electronic Control Unit) of an electric vehicle, so that the running battery transfers to the load. Switch the DC power supply state of.

As shown in FIG. 1, the electromagnetic relay 1 of the present embodiment includes a contact device 2 and an electromagnet device 5. The electromagnetic relay 1 further includes a housing 9 that houses the contact device 2 and the electromagnet device 5. The housing 9 houses the contact device 2 and the electromagnet device 5 so that the internal space is airtight.

First, the contact device 2 of the present embodiment will be described with reference to FIG.

As shown in FIG. 1, the contact device 2 includes at least one fixed contact 211, a movable contact 22, and a shield member 3. The movable contact 22 has at least one movable contact 222. Further, the contact device 2 further includes at least one fixed terminal 21, a contact pressure spring 23, a holder 24, a drive shaft 25, an inner case 41, a connecting body 42, and a magnetic flux generating section 43. There is. Here, the contact device 2 includes a plurality (two in the example of FIG. 1) of fixed contacts 211 and a plurality (two in the example of FIG. 1) of fixed terminals 21. The movable contact 22 has a plurality of (two in the example of FIG. 1) movable contacts 222.

In the following, the direction in which each fixed contact 211 and the corresponding movable contact 222 are lined up (vertical direction in FIG. 1) is defined as the vertical direction, and the fixed contact 211 side as viewed from the movable contact 222 is the top, and the fixed contact The movable contact 222 side is viewed from the side of 211. Further, in the electromagnetic relay 1, the direction in which the two fixed contacts 211 are arranged (the horizontal direction in FIG. 1) is defined as the horizontal direction. A direction orthogonal to both the up-down direction and the left-right direction (the direction connecting the front side and the back side of the paper surface of FIG. 1) is defined as the front-back direction. However, these directions are not intended to limit the use direction of the electromagnetic relay 1.

Each of the plurality of fixed terminals 21 is formed of a conductive material such as copper. The shape of each fixed terminal 21 is a column. Each fixed terminal 21 is inserted into a through hole 411 formed in the inner case 41. Further, each fixed terminal 21 is inserted into a through hole 911 formed in the housing 9. Each fixed terminal 21 is joined to the inner case 41 by brazing with its upper end protruding from the upper surface of the inner case 41 and the upper surface of the housing 9.

The plurality of fixed terminals 21 correspond to the plurality of fixed contacts 211 one to one. A corresponding fixed contact 211 is attached to the lower end of each fixed terminal 21. Note that each fixed contact 211 may be formed integrally with the fixed terminal 21.

The movable contact 22 is made of a conductive material. The movable contact 22 is formed in a flat plate shape. The longitudinal direction of the movable contact 22 is along the left-right direction. The plurality of movable contacts 222 are provided on both ends of the upper surface of the movable contact 22 in the left-right direction. The plurality of movable contacts 222 correspond one-to-one with the plurality of fixed contacts 211. Each movable contact 222 faces the corresponding fixed contact 211 in the vertical direction. In the present embodiment, the plurality of movable contacts 222 are integrated with the portion of the movable contact 22 other than the plurality of movable contacts 222, but may be separate bodies.

The movable contact 22 is between a closed position in which the plurality of movable contacts 222 respectively contact the corresponding fixed contacts 211 and an open position (the position shown in FIG. 1) in which the plurality of movable contacts 222 are separated from the fixed contacts 211. You can move with. More specifically, when the exciting coil 51 of the electromagnet device 5 is energized, a magnetic flux is generated, and the movable contact 22 moves from the open position to the closed position according to the generated magnetic flux. As a result, the two fixed terminals 21 are brought into conduction via the movable contact 22. When the exciting coil 51 is not energized, the movable contact 22 is located at the open position by the spring force of the return spring 55 provided in the electromagnet device 5. As a result, the two fixed terminals 21 are not electrically connected.

The holder 24 has an upper wall 241 and a lower block 242. The upper wall 241 and the lower block 242 face each other in the vertical direction. The holder 24 also has a front wall that connects the front end of the upper wall 241 and the front end of the lower block 242, and a rear wall that connects the rear end of the upper wall 241 and the rear end of the lower block 242. The holder 24 has a hollow cylindrical shape having a hole penetrating in the left-right direction, and the movable contact 22 is passed between the upper wall 241 and the lower block 242.

The contact pressure spring 23 is, for example, a compression coil spring. The contact pressure spring 23 is arranged between the lower block 242 of the holder 24 and the movable contact 22 with the axial direction (extending and contracting direction) directed vertically. The contact pressure spring 23 applies an upward spring force to the movable contact 22. That is, the contact pressure spring 23 applies a spring force to the movable contact 22 in a direction approaching the plurality of fixed contacts 211 (upward).

The drive shaft 25 has a round bar shape. The axial direction of the drive shaft 25 is along the vertical direction. The upper end of the drive shaft 25 is connected to the holder 24, more specifically, the lower block 242. The lower end of the drive shaft 25 is connected to a movable iron core 53 provided in the electromagnet device 5. The drive shaft 25 moves in the up-down direction as the energization and de-energization of the exciting coil 51 of the electromagnet device 5 are switched. Along with this, the holder 24 moves in the vertical direction, and the movable contact 22 passed through the holder 24 moves in the vertical direction. As a result, the drive shaft 25 moves the movable contact 22 between the open position and the closed position.

The inner case 41 is made of a heat resistant material such as ceramic. The inner case 41 has electrical insulation. The shape of the inner case 41 is a box shape whose lower surface is opened. On the upper wall of the inner case 41, two through holes 411 arranged in the left-right direction are formed. The space inside the inner case 41 is a housing chamber 410 that houses the plurality of fixed contacts 211 and the movable contact 22. An arc-extinguishing gas such as hydrogen is sealed in the accommodation chamber 410.

The shape of the connecting body 42 is a rectangular frame shape. The connecting body 42 is joined to the inner case 41 by brazing. Further, the connecting body 42 is joined to the yoke 54 provided on the electromagnet device 5, more specifically, the first yoke plate 541 by brazing. As a result, the connecting body 42 connects the inner case 41 and the yoke 54.

The magnetic flux generator 43 has a pair of permanent magnets 431. Each permanent magnet 431 has a flat plate shape. The thickness direction of each permanent magnet 431 is along the left-right direction. The pair of permanent magnets 431 are located between the outer surface of the inner case 41 and the inner surface of the housing 9. The pair of permanent magnets 431 are arranged outside the two fixed contacts 211 in the direction in which the two fixed contacts 211 are arranged. In other words, the two fixed contacts 211 are arranged between the pair of permanent magnets 431. The pair of permanent magnets 431 face the movable contact 22 in the longitudinal direction (left-right direction) of the movable contact 22. Here, the pair of permanent magnets 431 facing the movable contact 22 means that a member such as the inner case 41 is arranged between each permanent magnet 431 and the movable contact 22 as in the present embodiment. Including cases. The pair of permanent magnets 431 have surfaces having different polarities, that is, the N pole and the S pole face each other. For example, in FIG. 1, the right permanent magnet 431 has the N pole facing left, and the left permanent magnet 431 has the S pole facing right. Therefore, in the accommodation chamber 410, a magnetic flux is generated from the left magnetic pole surface (N pole) of the right permanent magnet 431 to the right magnetic pole surface (S pole) of the left permanent magnet 431. The pair of permanent magnets 431 generate a magnetic flux along the longitudinal direction (left-right direction) of the movable contact 22 around the two fixed contacts 211.

The electromagnetic relay 1 further includes a pair of bridge portions 44. The pair of bridge portions 44 are made of a magnetic material. One of the pair of bridging portions 44 is arranged on the front side of the paper of FIG. 1 when viewed from the movable contact 22, and the other is arranged on the back side of the paper of FIG. 1 viewed from the movable contact 22. .. Each bridging portion 44 includes a flat plate-shaped portion whose thickness direction extends in the front-rear direction and plate-shaped portions that project forward or rearward from both ends of the flat plate-shaped portion in the left-right direction. It is formed in a U shape. The pair of bridging portions 44 are arranged so as to have a rectangular frame shape that covers the outside of the inner case 41 when viewed in the vertical direction. The pair of bridge portions 44 are arranged so as to bridge between the pair of permanent magnets 431. The bridge portion 44 constitutes a magnetic circuit through which the magnetic flux of the permanent magnet 4 passes.

The shielding member 3 has electrical insulation. The shielding member 3 is formed of a material having electrical insulation such as ceramic or synthetic resin. The shielding member 3 is housed in the housing chamber 410. Here, in the contact device 2, when the movable contact 22 moves from the closed position to the open position, that is, when the movable contact 222 separates from the fixed contact 211, an arc is generated between the fixed contact 211 and the movable contact 222. I have something to do. The shield member 3 is a member for shielding an arc generated between the fixed contact 211 and the movable contact 222.

As shown in FIG. 1, the shielding member 3 includes a base 31, a plurality (two in the example of FIG. 1) of outer walls 32, and a plurality (two in the example of FIG. 1) of partition walls 33. There is. Here, the base 31, the plurality of outer walls 32, and the plurality of partition walls 33 are an integral structure.

The shape of the base 31 is a rectangular plate shape. The longitudinal direction of the base 31 is along the longitudinal direction (lateral direction) of the movable contact 22. The thickness direction of the base 31 is along the direction in which the fixed contact 211 and the movable contact 222 face each other (vertical direction). The thickness direction of the base 31 is along the thickness direction of the first yoke plate 541 in the electromagnet device 5. The base 31 is in contact with the first yoke plate 541. The base 31 is arranged between the first yoke plate 541 and the movable contact 22.

The plurality of outer walls 32 project from the upper surface of the base 31 in the thickness direction of the base 31. Each outer wall 32 has a rectangular plate-shaped portion whose thickness direction extends in the left-right direction. One outer wall 32 is provided on one side (left side) in the longitudinal direction of the base 31, and the other outer wall 32 is provided on the other side (right side) in the longitudinal direction of the base 31.

The plurality of partition walls 33 correspond to the plurality of outer walls 32 one to one. Each partition 33 has a plate shape whose thickness direction is along the front-back direction. Each partition 33 extends to the left or right from the center in the front-rear direction of the inner surface of the corresponding outer wall 32. A substantially rectangular through hole 332 that penetrates in the thickness direction (front-rear direction) is formed in the lower portion of the partition wall 33.

When the movable contact 222 separates from the fixed contact 211 when an electric current is flowing between the pair of fixed terminals 21, an arc may occur between the fixed contact 211 and the movable contact 222. A Lorentz force is applied to this arc by the magnetic flux generated by the pair of permanent magnets 431 of the magnetic flux generator 43. The direction of the Lorentz force acting on the arc is the direction orthogonal to both the direction of the magnetic flux and the direction of the current flowing through the arc.

For example, if the direction of the magnetic flux is from right to left in FIG. 1 and the direction of the current flowing between the fixed contact 211 and the movable contact 222 is from top to bottom in FIG. Lorentz force acts from the front side to the back side of the paper. Due to this Lorentz force, the arc is extended to the back side of the paper surface of FIG. 1 and is curved (for example, in a C shape) so as to draw a bulging arc toward the back side of the paper surface of FIG. 1. When the arc bends, the direction of the current flowing through each part of the arc also changes to follow the shape of the arc, and the Lorentz force acting on the arc in a direction orthogonal to the direction of the current further extends the arc. When the arc thus extended reaches the inner surface of the inner case 41, the outer wall 32, the partition wall 33, etc., it is further extended along these. Then, the arc is sufficiently extended to promote extinction of the arc.

A cylindrical portion 34 is provided on the base 31. The tubular portion 34 has a cylindrical shape in which the axial direction of the tubular portion 34 is along the thickness direction of the base 31. The tubular portion 34 is located between the two partition walls 33. The tubular portion 34 is located at the center of the base 31. The tubular portion 34 has a through hole that penetrates in the axial direction. A through hole is also provided in the center of the base 31, and the through hole of the tubular portion 34 and the through hole of the base 31 are connected to each other. The drive shaft 25 is passed through the through holes of the tubular portion 34 and the base 31.

The tubular portion 34 surrounds at least a part of the periphery of the drive shaft 25, and in the present embodiment, the entire periphery of the drive shaft 25. Therefore, the cylindrical portion 34 can prevent foreign matter from adhering to the drive shaft 25.

Next, the electromagnet device 5 of the present embodiment will be described with reference to FIGS.

As shown in FIG. 1, the electromagnet device 5 includes an exciting coil 51, a coil bobbin 52, a movable iron core 53 (movable member), a yoke 54, a return spring 55, a cylindrical member 56, a bush 57, and a permanent magnet. The magnet 58 and the auxiliary yoke 7 are provided. Further, the electromagnet device 5 includes a pair of coil terminals 510 (only one is shown in FIG. 1) to which both ends of the exciting coil 51 are connected. Each coil terminal 510 is formed of a conductive material such as copper and is connected to a lead wire by soldering or the like.

The coil bobbin 52 is made of a nonmagnetic material such as resin. The coil bobbin 52 has two collar portions 521 and 522 and a winding drum portion 523. The winding drum portion 523 has a hollow cylindrical shape. The winding drum portion 523 has an axial direction extending in the vertical direction. The exciting coil 51 is wound around the winding drum portion 523. The wire of the exciting coil 51 is made of a non-magnetic conductive material such as copper. The collar portion 521 extends outward from the upper end of the winding drum portion 523 in the radial direction of the winding drum portion 523. The collar portion 522 extends outward from the lower end of the winding drum portion 523 in the radial direction of the winding drum portion 523.

The winding drum portion 523 has a first winding portion 524, a second winding portion 525, and a connecting portion 526. Both the first winding portion 524 and the second winding portion 525 have a cylindrical shape. Each of the first winding portion 524 and the second winding portion 525 has an axial direction along the vertical direction. The connecting portion 526 has an annular shape. The first winding portion 524 and the second winding portion 525 are adjacent to each other in the vertical direction, and the first winding portion 524 is on the upper side (the side closer to the flange portion 521). The first winding portion 524 and the second winding portion 525 are connected by a connecting portion 526 and are provided in a step shape. As shown in FIG. 1, the diameter of the outer peripheral surface of the first winding portion 524 is larger than the diameter of the outer peripheral surface of the second winding portion 525.

As shown in FIGS. 2 and 3, the cylindrical member 56 has a bottomed cylindrical tubular portion 561 having an open upper end, and a flange portion 562 that extends radially outward from the upper end of the tubular portion 561. ing. As shown in FIG. 1, the cylindrical member 56 is housed in the winding barrel portion 523 of the coil bobbin 52. The outer peripheral edge of the collar portion 562 faces the upper end of the inner peripheral surface of the collar portion 521 of the coil bobbin 52.

The movable iron core 53 is made of a magnetic material. The movable core 53 has a cylindrical shape. The movable iron core 53 is housed in the cylindrical portion 561 of the cylindrical member 56. In this embodiment, a through hole is formed at the center of the movable iron core 53, and the drive shaft 25 is passed through the through hole. The movable iron core 53 and the drive shaft 25 are connected. The movable core 53 may have a recess on the upper surface thereof, into which the lower end of the drive shaft 25 is inserted, instead of having the through hole. At the center of the movable iron core 53, a concave portion 531 that is recessed downward from the upper surface is formed. As shown in FIG. 1, when the exciting coil 51 is not energized, there is a gap G1 between the movable iron core 53 and the first yoke plate 541.

The yoke 54 is made of a magnetic material. The yoke 54 has a rectangular frame shape with open front and rear surfaces. The yoke 54 includes a first yoke plate 541 (fixing member), a second yoke plate 542, and a pair of third yoke plates 543.

The shape of the first yoke plate 541 is a rectangular plate shape. The thickness direction of the first yoke plate 541 is along the vertical direction. The first yoke plate 541 is arranged between the movable contact 22 and the exciting coil 51. The first yoke plate 541 is in contact with the upper surface of the coil bobbin 52 (the upper surface of the flange 521). The first yoke plate 541 (yoke plate) is arranged at the end of the exciting coil 51. More specifically, the first yoke plate 541 is arranged at a position facing the first end (upper end) of the exciting coil 51 in the axial direction. An insertion hole 544 is formed substantially in the center of the first yoke plate 541. The drive shaft 25 is passed through the insertion hole 544.

The shape of the second yoke plate 542 is a rectangular plate shape. The thickness direction of the second yoke plate 542 is along the vertical direction. The second yoke plate 542 is arranged below the exciting coil 51. The second yoke plate 542 is in contact with the lower surface of the coil bobbin 52 (the lower surface of the flange 522). The second yoke plate 542 is arranged at the end of the exciting coil 51. More specifically, the second yoke plate 542 is arranged at a position facing the second end (lower end) of the exciting coil 51 in the axial direction.

The shape of each third yoke plate 543 is a rectangular plate shape. The pair of third yoke plates 543 extend (upward) from the left and right ends of the second yoke plate 542 toward the first yoke plate 541. The thickness direction of each of the third yoke plates 543 is along the left-right direction. The pair of third yoke plates 543 are integral with the second yoke plate 542.

When the exciting coil 51 is energized, the magnetic flux M1 generated in the exciting coil 51 (see the one-dot chain line arrow in FIG. 3, hereinafter referred to as “first magnetic flux M1”) passes through the yoke 54. The yoke 54 constitutes a part of a magnetic circuit (hereinafter, referred to as “first magnetic circuit”) through which the first magnetic flux M1 generated in the exciting coil 51 passes when the exciting coil 51 is energized. .. Therefore, each of the first yoke plate 541, the second yoke plate 542, and the pair of third yoke plates 543 also constitutes a part of the first magnetic circuit.

The return spring 55 is, for example, a compression coil spring. The drive shaft 25 is passed through the return spring 55. The first end (upper end) of the return spring 55 in the expansion/contraction direction (vertical direction) is in contact with the first yoke plate 541, and the second end (lower end) thereof is in contact with the bottom surface of the recess 531 of the movable iron core 53. ing. The return spring 55 gives a force to move the movable iron core 53 downward.

The bush 57 is made of a magnetic material. The bush 57 has a cylindrical shape. The bush 57 is arranged between the inner peripheral surface of the coil bobbin 52 and the outer peripheral surface of the cylindrical portion 561 of the cylindrical member 56. The bush 57, together with the first to third yoke plates 541 to 543 and the movable iron core 53, constitutes the above-mentioned first magnetic circuit through which the first magnetic flux M1 passes. The first magnetic circuit is a path that passes through the first yoke plate 541, one second yoke plate 542, the third yoke plate 543, the bush 57, and the movable iron core 53 (see FIG. 3 ).

As shown in FIG. 2, the permanent magnet 58 has a ring shape, more specifically, a ring shape. As shown in FIG. 1, the cross section of the permanent magnet 58 is substantially rectangular. The inner surface of the permanent magnet 58 faces the outer periphery of the upper end of the cylindrical portion 561 of the cylindrical member 56. The permanent magnet 58 is arranged with a space (gap) from the outer periphery of the tubular portion 561. The upper surface of the permanent magnet 58 is in contact with the lower surface of the flange portion 562 of the cylindrical member 56. The permanent magnet 58 faces the above-mentioned gap G1 between the movable iron core 53 and the first yoke plate 541 when viewed from the direction (front-back direction) orthogonal to the vertical direction.

As shown in FIG. 3, the lower surface of the permanent magnet 58 is the first magnetic pole surface 581, and the upper surface thereof is the second magnetic pole surface 582. One of the first magnetic pole surface 581 and the second magnetic pole surface 582 is an N pole and the other is an S pole. In the permanent magnet 58 of the present embodiment, the lower surface (first magnetic pole surface 581) is the N pole and the upper surface (second magnetic pole surface 582) is the S pole. As schematically shown by a dotted arrow in FIG. 3, the permanent magnet 58 has a magnetic flux M2 (hereinafter, referred to as a “first magnetic pole”) which is emitted from the first magnetic pole surface 581 which is the N pole and enters the second magnetic pole surface 582 which is the S pole. 2 magnetic flux M2").

As shown in FIGS. 2 to 4, the auxiliary yoke 7 has a ring shape. The auxiliary yoke 7 is made of a magnetic material. For example, the auxiliary yoke 7 is formed of a ferromagnetic metal material such as iron. The auxiliary yoke 7 has a first portion 71 and a second portion 72. As shown in FIG. 2, the second portion 72 has a cylindrical shape. The first portion 71 has a ring-shaped brim shape and extends outward from the upper end of the second portion 72 in the radial direction of the second portion 72. As shown in FIGS. 3 and 4, a portion 73 connecting the first portion 71 and the second portion 72 is curved.

The cross section of the auxiliary yoke 7 is not substantially rectangular. The cross section of the auxiliary yoke 7 is substantially L-shaped in this embodiment. As shown in FIG. 4, the auxiliary yoke 7 is hollow in a region surrounded by the first portion 71 and the second portion 72 in a sectional view. In other words, the auxiliary yoke 7 has the low magnetic permeability portion 74 having a magnetic permeability smaller than that of the first portion 71 and the second portion 72 in the region surrounded by the first portion 71 and the second portion 72.

The upper surface of the first portion 71 of the auxiliary yoke 7 faces the lower surface (second magnetic pole surface 582) of the permanent magnet 58. Particularly, in the present embodiment, the upper surface of the first portion 71 of the auxiliary yoke 7 is in contact with the lower surface of the permanent magnet 58. That is, the first portion 71 of the auxiliary yoke 7 faces one magnetic pole surface of the permanent magnet 58. Hereinafter, the surface of the permanent magnet 58 facing the first portion 71 is also referred to as a first surface 61. On the other hand, the inner peripheral surface of the second portion 72 faces the outer peripheral surface of the movable iron core 53 with the tube portion 561 of the cylindrical member 56 interposed therebetween. Hereinafter, the surface of the member (the movable iron core 53 in this case) facing the second portion 72 is also referred to as the second surface 62. As shown in FIG. 3, the normal direction of the first surface 61 and the normal direction of the second surface 62 are different.

Here, the normal direction of the first surface 61 and the normal direction of the second surface 62 are not parallel but different. Therefore, a magnetic gap (space) is generated between the first surface 61 and the second surface 62, and the magnetic path between the first surface 61 and the second surface 62 has a relatively large magnetic resistance. ..

Therefore, in the electromagnet device 5 of the present embodiment, the auxiliary yoke 7 includes the first portion 71 facing the first surface 61 (the magnetic pole surface of the permanent magnet 58) and the second portion 62 (the surface of the movable iron core). And a second portion 72 facing each other in the direction. The first portion 71 faces the first surface 61 in the first direction. The second portion 72 faces the second surface 62 in the second direction. The first direction and the second direction are different. Here, the first direction corresponds to the axial direction (vertical direction) of the auxiliary coil 7. The second direction corresponds to the radial direction of the auxiliary coil 7. In this way, since the first portion 71 and the second portion 72 face the first surface 61 and the second surface 62, respectively, the magnetic path between the first surface 61 and the second surface 62 is There is an auxiliary yoke 7. Then, for example, the magnetic flux that has entered the first portion 71 of the auxiliary yoke 7 from the first surface 61 has its direction changed inside the auxiliary yoke 7, and moves from the second portion 72 of the auxiliary yoke 7 toward the second surface 62. I will go out. As described above, since the auxiliary yoke 7 includes the first portion 71 and the second portion 72, the magnetic resistance between the first surface 61 and the second surface 62 can be reduced.

That is, the auxiliary yoke 7 forms, together with the first yoke plate 541 and the movable iron core 53, a second magnetic circuit through which the second magnetic flux M2 of the permanent magnet 58 passes. The second magnetic circuit is a path that passes through the auxiliary yoke 7, the movable iron core 53, and the first yoke plate 541 (see FIG. 3 ).

Further, as shown in FIGS. 3 and 4, the auxiliary yoke 7 has a low magnetic permeability portion 74 in a region surrounded by the first portion 71 and the second portion 72. In other words, the auxiliary yoke 7 moves in the second direction (opposing direction of the second portion 72 and the second surface 62) of the surface of the first portion 71 facing the first surface 61 (first magnetic pole surface 581). To the portion A1 where the projection area of the second area 72 and the projection area in the first direction (the facing direction of the first area 71 and the first surface 61) of the surface facing the second surface 62 of the second area 72 overlap. It has a low magnetic permeability portion 74. Therefore, in the electromagnet device 5 of this embodiment, the weight of the auxiliary yoke 7 can be reduced.

In this embodiment, as shown in FIG. 4, the low magnetic permeability portion 74 preferably has the space SP1. Therefore, it is possible to further reduce the weight of the auxiliary yoke 7 as compared with the case where a ferromagnetic material such as iron is arranged in the low magnetic permeability portion 74 and joined to the auxiliary yoke 7. Further, in the present embodiment, as shown in FIG. 3, a part of the coil bobbin 52 and a part of the exciting coil 51 are located in the low magnetic permeability part 74 that is the space SP1. That is, at least a part of the second winding portion 525 is located in the low magnetic permeability portion 74. Therefore, this space SP1 is effectively used and, for example, the size of the electromagnet device 5 can be reduced.

As shown in FIG. 1, the permanent magnet 58 and the auxiliary yoke 7 are fixed to the first yoke plate 541 (fixing member) by being sandwiched between the coil bobbin 52 and the flange portion 562 of the cylindrical member 56. ing. Therefore, the auxiliary yoke 7 is fixed to the permanent magnet 58. On the upper surface of the connecting portion 526 of the coil bobbin 52, for example, four positioning protrusions are provided at equal intervals. The auxiliary yoke 7 is positioned with respect to the coil bobbin 52 by the positioning protrusion.

As shown in FIG. 3, the permanent magnet 58 has a direction of the first magnetic flux M1 and a direction of the second magnetic flux M2 on the surface of the movable iron core 53 (movable member) facing the first yoke plate 541 (fixed member). The directions of the magnetic poles are set so that the directions are the same.

Next, the operation of the electromagnetic relay 1 will be described with reference to FIGS. 1 and 3.

When the exciting coil 51 is not energized, the exciting coil 51 does not generate the first magnetic flux M1, and therefore the force from the exciting coil 51 does not act on the movable iron core 53. On the other hand, an upward force due to the second magnetic flux M2 of the permanent magnet 58 acts on the movable iron core 53. That is, since the second magnetic flux M2 passes through the second magnetic circuit, a force (upward force) that moves the movable iron core 53 in a direction that reduces the magnetic resistance of the second magnetic circuit acts on the movable iron core 53. .. Further, the spring force (downward force) from the return spring 55 acts on the movable iron core 53. Therefore, the movable iron core 53 (movable member) is located at a position in FIG. 1 where the upward force and the downward force are balanced, that is, a position away from the first yoke plate 541 (fixed member). The gap G1 is formed between the movable iron core 53 and the first yoke plate 541 as described above. At this time, the holder 24 coupled to the movable iron core 53 is also located at the position shown in FIG. Therefore, the movable contact 22 is positioned at the open position (the position in FIG. 1) where the movable contact 222 is separated from the fixed contact 211 by the holder 24. As a result, the electric path between the pair of fixed terminals 21 is cut off.

When the exciting coil 51 is energized, the first magnetic flux M1 generated in the exciting coil 51 passes through the first magnetic circuit. Then, a force that moves the movable iron core 53 acts on the movable iron core 53 so that the magnetic resistance of the first magnetic circuit becomes small. Specifically, when the exciting coil 51 is energized, a force (upward force) that moves the movable core 53 in a direction to reduce the gap G1 acts on the movable core 53. Then, the force for moving the movable iron core 53 upward (the resultant force of the force by the first magnetic flux M1 and the force by the second magnetic flux M2) is the force by which the return spring 55 pushes the movable iron core 53 downward (spring. When the force is exceeded, the movable iron core 53 (movable member) moves upward toward the first yoke plate 541 (fixed member). As a result, the drive shaft 25 moves upward, and the movable contact 22 moves upward. That is, the movable contact 22 moves together with the holder 24, the drive shaft 25, and the movable iron core 53 to a position (closed position) above the position in FIG. As a result, each movable contact 222 of the movable contact 22 comes into contact with the corresponding fixed contact 211, and the pair of fixed terminals 21 becomes conductive.

When the exciting coil 51 is switched from being energized to being not energized, the first magnetic flux M1 disappears, and the upward force acting on the movable iron core 53 by the first magnetic flux M1 disappears. As a result, since the downward force due to the spring force of the return spring 55 is dominant in the vertical force acting on the movable iron core 53, the movable iron core 53 (movable member) is the first yoke plate 541 (fixed member). ) Move downwards away from. As a result, the drive shaft 25 moves downward, and the movable contact 22 moves downward. That is, the movable contact 22 moves to the position (open position) in FIG. 1 together with the holder 24, the drive shaft 25, and the movable iron core 53. As a result, each movable contact 222 separates from the corresponding fixed contact 211, and the electric path between the pair of fixed terminals 21 is cut off.

As described above, the electromagnet device 5 of the present embodiment constitutes a part of the permanent magnet 58 arranged at a position facing the gap G1 and the second magnetic circuit through which the second magnetic flux M2 of the permanent magnet 58 passes. And an auxiliary yoke 7 that operates. The direction of the force acting on the movable iron core 53 by the second magnetic flux M2 is the same as the direction of the force acting on the movable iron core 53 by the first magnetic flux M1 when the exciting coil 51 is energized. That is, the force acting on the movable iron core 53 by the second magnetic flux M2 of the permanent magnet 58 assists the upward movement of the movable iron core 53 by the force acting on the movable iron core 53 by the first magnetic flux M1 of the exciting coil 51. .. Therefore, even if the upward force exerted on the movable iron core 53 by the first magnetic flux M1 is relatively small, the movable iron core 53 can be moved upward.

Further, the auxiliary yoke 7 of the present embodiment is a region surrounded by the first portion 71 and the second portion 72 in a cross-sectional view (projection of the surface of the first portion 71 facing the first surface 61 in the second direction). The low magnetic permeability portion 74, which is a portion A1) where the area and the projection area in the first direction of the surface facing the second surface 62 in the second portion 72 overlap, is the space SP1. Therefore, another member can be arranged in this space SP1. In the present embodiment, as shown in FIG. 3, a part (winding) of the exciting coil 51 and a part of the coil bobbin 52 are located in the part corresponding to the space SP1. Therefore, it is possible to increase the number of turns of the exciting coil 51 by the number of windings arranged in the space SP1 as compared with the case where the low magnetic permeability portion 74 is not in the space SP1.

By the way, as described above, the second magnetic flux M2 gives an upward force to the movable iron core 53. This force assists the movement of the movable core 53 when the exciting coil 51 is energized to move the movable core 53 upward. On the other hand, the force of the second magnetic flux M2 impedes the movement of the movable core 53 when the energization of the exciting coil 51 is stopped and the movable core 53 is moved downward.

Therefore, in the electromagnet device 5 of the present embodiment, as shown in FIG. 5, the lower edge of the auxiliary yoke 7 is opposed to the upper edge of the bush 57. Therefore, although a part of the component M21 of the second magnetic flux M2 passes through the second magnetic circuit (the route passing through the auxiliary yoke 7, the movable iron core 53, and the first yoke plate 541) as described above, The remaining at least a part of the component M22 of the magnetic flux M2 is easily directed to another magnetic circuit including the bush 57. Here, another magnetic circuit (third magnetic circuit) is a path that passes through the auxiliary yoke 7, the bush 57, the second yoke plate 542, the third yoke plate 543, and the first yoke plate 541. A part (yoke 54 and bush 57) is also used as the first magnetic circuit. That is, the bush 57 functions as a magnetic member that guides at least a part of the second magnetic flux generated by the permanent magnet 58 to the yoke 54 (first magnetic circuit).

In the second magnetic flux M2, the ratio of the component M21 passing through the second magnetic circuit and the component M22 passing through the third magnetic circuit sets the size of the gap between the bush 57 and the auxiliary yoke 7 as appropriate. By doing so, it is possible to set. That is, since the electromagnet device 5 of the present embodiment includes the bush 57, the size of the component M21 of the second magnetic flux M2 that passes through the second magnetic circuit can be set by appropriately setting the shape of the bush 57. In other words, the magnitude of the force acting on the movable iron core 53 by the second magnetic flux M2 can be set appropriately.

(2) Modified Example The above-described embodiment is only one of the various embodiments of the present disclosure. The above-described embodiment can be variously modified according to the design and the like as long as the object of the present disclosure can be achieved. Hereinafter, modifications of the above-described embodiment will be listed. The modifications described below can be applied in appropriate combination.

(2.1) Modification 1
In the electromagnetic relay 1 of the embodiment, the second portion 72 of the auxiliary yoke 7 faces the movable member (movable iron core 53), but the second portion 72A faces the fixed member (first yoke plate 541). May be. That is, the second surface 62 facing the second portion 72 may be the surface of the fixed member (first yoke plate 541) instead of the surface of the movable member (movable iron core 53). Hereinafter, the electromagnetic relay 1A according to the first modification will be described with reference to FIG. The same components as those of the electromagnetic relay 1 of the embodiment are designated by the same reference numerals, and the description thereof will be omitted as appropriate.

In the electromagnet device 5A of the electromagnetic relay 1A according to the present modification, the permanent magnet 58A has an annular shape, the inner peripheral surface is the first magnetic pole surface 581A, and the outer peripheral surface is the second magnetic pole surface 582A. The first magnetic pole surface 581A faces the movable iron core 53 (movable member). In this modification, the first magnetic pole surface 581A is the N pole and the second magnetic pole surface 582A is the S pole.

The auxiliary yoke 7A has a ring shape. The cross section of the auxiliary yoke 7A is substantially L-shaped. The auxiliary yoke 7A has a first portion 71A and a second portion 72A. The first portion 71A has a cylindrical shape. The second portion 72A has an annular brim shape. The second portion 72A extends outward from the upper end of the first portion 71A in the radial direction of the first portion 71A. The inner peripheral surface of the first portion 71A faces the outer peripheral surface (second magnetic pole surface 582A: first surface 61) of the permanent magnet 58 in the first direction. The upper surface of the second portion 72A faces the lower surface (second surface 62) of the first yoke plate 541 in the second direction, and is in contact with this modification. Here, the first direction corresponds to the radial direction of the auxiliary coil 7. The second direction corresponds to the axial direction (up and down direction) of the auxiliary coil 7. A portion 73A connecting the first portion 71A and the second portion 72A is curved. The auxiliary yoke 7A has a low magnetic permeability portion 74A (a space in this modification) having a magnetic permeability smaller than that of the first portion 71A and the second portion 72A in a region surrounded by the first portion 71A and the second portion 72A. have. In other words, the auxiliary yoke 7A has a projection area in the second direction of the surface of the first portion 71A facing the first surface 61 and a surface of the second portion 72A facing the second surface 62 in the first direction. The low magnetic permeability portion 74A is provided in a portion A1 where the projection area for the area A overlaps with the area A1.

As shown in FIG. 6, in the coil bobbin 52A of the present modification, the winding body 523A has a first winding portion 524A, a second winding portion 525A, a connecting portion 526A, and further, a third winding portion 527A. And a second connecting portion 528A. The first winding portion 524A overlaps with the permanent magnet 58A when viewed in a direction (horizontal direction) orthogonal to the axial direction (vertical direction) of the exciting coil 51A. At least a part of the second winding portion 525A is located in the low magnetic permeability portion 74A. The third winding portion 527A has a cylindrical shape. The second connection portion 528A has an annular shape. The third winding portion 527A is adjacent to the second winding portion 525A in the top-bottom direction and is below the second winding portion 525A. The second winding portion 525A and the third winding portion 527A are coupled by the second connecting portion 528A. The diameter of the outer peripheral surface of the second winding portion 525A is smaller than the diameter of the outer peripheral surface of the first winding portion 524A, and the diameter of the outer peripheral surface of the third winding portion 527A is the outer peripheral surface of the second winding portion 525A. Smaller than the diameter of.

Also in the electromagnetic relay 1A of the present modification, the second magnetic flux M2 generated by the permanent magnet 58A passes through the second magnetic circuit including the movable iron core 53, the first yoke plate 541, and the auxiliary yoke 7A, and is transmitted to the movable iron core 53. And give upward power. Therefore, when the exciting coil 51A is energized, the movable iron core 53 can be moved upward even if the upward force exerted on the movable iron core 53 by the first magnetic flux M1 is relatively small. Further, the auxiliary yoke 7A can be reduced in weight by the amount of the low magnetic permeability portion 74A as compared with the case where the cross section has a rectangular shape. It is possible to arrange the members of.

(2.2) Modification 2
In the electromagnetic relay 1 of the embodiment, one auxiliary yoke 7 is provided so as to face one magnetic pole surface of the permanent magnet 58, but two auxiliary yokes 7 are provided so as to face both magnetic pole surfaces of the permanent magnet 58B. The auxiliary yoke 7B may be provided. Hereinafter, the electromagnetic relay 1B according to the second modification will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, the electromagnet device 5B of the electromagnetic relay 1B of this modified example includes a fixed iron core 59B (fixing member). The fixed iron core 59B is made of a magnetic material. The fixed iron core 59B has a cylindrical shape having a flange 591B at the upper end. The fixed iron core 59B has a through hole 592B penetrating in the axial direction. The fixed iron core 59B is arranged in the through hole at the center of the first yoke plate 541B. The fixed iron core 59B is arranged in the tubular portion 561B of the cylindrical member 56B having the tubular portion 561B and the collar portion 562B. The fixed iron core 59B has a flange portion 591B joined to the first yoke plate 541B by, for example, brazing.

The drive shaft 25B is passed through the through hole 592B of the fixed iron core 59B. The lower end of the drive shaft 25B is connected to the movable iron core 53B. The return spring 55B is arranged in the through hole 592B, and the first end (upper end) is in contact with the lower surface of the cap 45B coupled to the upper surface of the first yoke plate 541B and the second end (upper end). The lower end) is in contact with the upper surface of the movable iron core 53B arranged in the cylindrical portion 561B of the cylindrical member 56B.

As shown in FIG. 8, in the electromagnet device 5B of the electromagnetic relay 1B of this modification, the permanent magnet 58B has an annular shape, the lower surface is the first magnetic pole surface 581B, and the upper surface is the second magnetic pole surface 582B. Is. As schematically shown by a dotted arrow in FIG. 7, the permanent magnet 58B generates a second magnetic flux M2 that exits from the first magnetic pole surface 581B that is the N pole and enters the second magnetic pole surface 582B that is the S pole. Let In the permanent magnet 58B, neither the first magnetic pole surface 581B nor the second magnetic pole surface 582B faces the movable iron core 53B (movable member) and the fixed iron core 59B (fixed member). The permanent magnet 58B faces the gap G2 between the movable iron core 53B and the fixed iron core 59B when viewed from the direction (front-back direction) orthogonal to the vertical direction.

The auxiliary yoke 7B includes a first auxiliary yoke 710B and a second auxiliary yoke 720B.

The first auxiliary yoke 710B has a first portion 711B and a second portion 712B. The second portion 712B has a cylindrical shape. The first portion 711B has an annular brim shape and extends outward from the lower end of the second portion 712B in the radial direction of the second portion 712B. The cross section of the first auxiliary yoke 710B is substantially L-shaped. The lower surface of the first portion 711B of the first auxiliary yoke 710B is in the first direction (axial direction of the first auxiliary yoke 710B) in the upper surface of the permanent magnet 58B (second magnetic pole surface 582B: first surface 61). Facing each other. Particularly, in this modification, the lower surface of the first portion 711B of the first auxiliary yoke 710B is in contact with the upper surface of the permanent magnet 58B. The inner peripheral surface of the second portion 712B sandwiches the cylindrical portion 561B of the cylindrical member 56B, and the outer peripheral surface (second surface 62) of the fixed iron core 59B (fixing member) and the second direction (of the first auxiliary yoke 710B). In the radial direction). A portion 713B connecting the first portion 711B and the second portion 712B is curved. In the cross-sectional view, the first auxiliary yoke 710B has a hollow region surrounded by the first portion 711B and the second portion 712B. In other words, the first auxiliary yoke 710B includes the first region 711B, which is the projection region of the surface facing the first surface 61 in the second direction, and the second region 712B, the surface facing the second surface 62. A low magnetic permeability portion 714B having a magnetic permeability smaller than those of the first portion 711B and the second portion 712B is provided in a portion A11 where the projected region in one direction overlaps.

The second auxiliary yoke 720B has a first portion 721B and a second portion 722B. The second portion 722B has a cylindrical shape. The first portion 721B has an annular brim shape and extends outward from the upper end of the second portion 722B in the radial direction of the second portion 722B. The cross section of the second auxiliary yoke 720B is substantially L-shaped. The upper surface of the first portion 721B of the second auxiliary yoke 720B and the lower surface of the permanent magnet 58B (first magnetic pole surface 581B: first surface 61) are in the first direction (axial direction of the second auxiliary yoke 720B). Facing each other. Facing each other. Particularly, in this modification, the upper surface of the first portion 721B of the second auxiliary yoke 720B is in contact with the lower surface of the permanent magnet 58B. The inner peripheral surface of the second portion 722B sandwiches the cylindrical portion 561B of the cylindrical member 56B, and the outer peripheral surface (second surface 62) of the movable iron core 53B (movable member) and the second direction (second auxiliary yoke 720B). In the radial direction). A portion 723B connecting the first portion 721B and the second portion 722B is curved. In the cross-sectional view, the second auxiliary yoke 720B has a hollow region surrounded by the first portion 721B and the second portion 722B. In other words, the second auxiliary yoke 720B includes a second projection area of the surface of the first portion 721B facing the first surface 61 in the second direction, and a portion of the second surface of the second portion 722B facing the second surface 62. A low magnetic permeability portion 724B having a magnetic permeability smaller than those of the first portion 721B and the second portion 722B is provided in a portion A12 where the projected region in one direction overlaps.

In the coil bobbin 52B of the present modification, the winding drum portion 523B has a cylindrical shape. The collar portion 521B extends inward and outward in the radial direction of the winding drum portion 523B from the upper end of the winding drum portion 523B, and the flange portion 522B extends from the lower end of the winding drum portion 523B to the winding drum portion 523B. It extends outward in the radial direction.

Although the first yoke plate 541B, the second yoke plate 542B and the third yoke plate 543B, the exciting coil 51B, the bush 57B, and the connecting body 42B of the yoke 54B in the present modification have different shapes, they correspond to the embodiment. Since the configuration and the function are the same, the description is omitted.

In the electromagnetic relay 1B of this modification, the second magnetic flux M2 generated by the permanent magnet 58B causes the second magnetic circuit including the second auxiliary yoke 720B, the movable iron core 53B, the fixed iron core 59B, and the first auxiliary yoke 710B. Pass through. Then, the second magnetic flux M2 gives an upward force to the movable iron core 53B. Therefore, when the exciting coil 51B is energized, it is possible to move the movable iron core 53B upward even if the upward force acting on the movable iron core 53B by the first magnetic flux M1 is relatively small. Further, each of the first auxiliary yoke 710B and the second auxiliary yoke 720B can be made lighter by the amount of the low magnetic permeability portions 714B and 724B as compared with the case where the cross section is rectangular. Further, when the low magnetic permeability portions 714B and 724B are spaces, it is possible to reduce the size of the electromagnet device 5B by disposing other members in this space.

(2.3) Other Modifications The auxiliary yoke 7 (7A, 710B, 720B) does not have to have a ring shape, and may have a shape that faces only a part of the permanent magnet 58 (58A, 58B). .. For example, the auxiliary yoke 7 (7A, 710B, 720B) may have a C-shape in a top view having a slit extending in the axial direction, or may be a part of the permanent magnet 58 in the circumferential direction (for example, a semi-annular portion). ) May be the only shape (semi-annular shape when viewed from above).

In the auxiliary yoke 7 (7A, 710B, 720B), the low magnetic permeability portion 74 (74A, 714B, 724B) does not have to be the space SP1 and has a lower magnetic permeability than the material of the first portion 71 and the second portion 72. It may be filled with a material such as a resin.

The auxiliary yoke 7 (7A, 710B, 720B) may not have a substantially L-shaped cross section. For example, the auxiliary yoke 7 (7A, 710B, 720B) is the first portion 71 (71A, 711B, 721B) from the end opposite to the first portion 71 (71A, 711B, 721B) in the second portion 72 (72A, 712B, 722B). 71A, 711B, 721B), and may have a third portion formed in parallel. That is, the auxiliary yoke 7 (7A, 710B, 720B) may have a C-shaped cross section. Alternatively, the auxiliary yoke 7 (7A, 710B, 720B) may have a square cross section. The auxiliary yoke 7 (7A, 710B, 720B) has a low magnetic permeability part (74, 74A) in a region surrounded by the first part 71 (71A, 711B, 721B) and the second part 72 (72A, 712B, 722B). , 714B, 724B).

In the auxiliary yoke 7, the portion 73 connecting the first portion 71 and the second portion 72 may not be curved.

The auxiliary yoke 7 (7A, 720B) is fixed to the permanent magnets (58, 58A, 58B) and the fixed member (first yoke plates 541, 541A, fixed iron core 59B), but the movable member (movable iron core). 53, 53A, 53B). For example, even if the auxiliary yoke 7 (7A, 720B) is fixed to the movable iron core 53 (53A, 53B) inside the cylindrical member 56 (56A, 56B) and moves together with the movable iron core 53 (53A, 53B). Good. In this case, if the cylindrical portion 561 (561A, 561B) of the cylindrical member 56 (56A, 56B) has a yoke accommodating portion that bulges outward at the position where the auxiliary yoke 7 (7A, 720B) is arranged. Good.

On the surface of the movable member (movable iron cores 53, 53A, 53B) facing the fixed member (first yoke plates 541, 541A, fixed iron core 59B), the second magnetic flux M2 generated by the permanent magnets 58 (58A, 58B) is The direction may be opposite to the first magnetic flux M1 generated by the exciting coil 51 (51A, 51B).

(3) Summary The following aspects are disclosed from the embodiment and modified examples described above.

The electromagnet device (5, 5A, 5B) of the first aspect includes an exciting coil (51, 51A, 51B), a fixed member (first yoke plates 541, 541A, a fixed iron core 59B), and a movable member (movable iron core). 53, 53A, 53B), permanent magnets (58, 58A, 58B), and auxiliary yokes (7, 7A, 7B). The exciting coils (51, 51A, 51B) generate a first magnetic flux (M1) when energized. The fixing member is made of a magnetic material. The movable member is made of a magnetic material. The movable member moves with respect to the fixed member in response to the generation of the first magnetic flux (M1). The permanent magnets (58, 58A, 58B) generate a second magnetic flux (M2). The auxiliary yoke (7, 7A, 7B) has a first portion (71, 71A, 711B, 721B) and a second portion (72, 72A, 712B, 722B). The first portion (71, 71A, 711B, 721B) faces the first surface (61) which is the magnetic pole surface of the permanent magnet (58, 58A, 58B) in the first direction. The second portion (72, 72A, 712B, 722B) faces the second surface (62), which is one of the fixed member and the movable member, in the second direction. In the auxiliary yoke (7, 7A, 7B), the second magnetic flux (M2) passes through the first portion (71, 71A, 711B, 721B) and the second portion (72, 72A, 712B, 722B). The normal direction of the first surface (61) and the normal direction of the second surface (62) are different. The auxiliary yokes (7, 7A, 7B) include a projection area in the second direction of a surface of the first portion (71, 71A, 711B, 721B) facing the first surface (61) and a second portion (72). , 72A, 712B, 722B), the low magnetic permeability portion (74, 74A, 714B, 724B). The low magnetic permeability portions (74, 74A, 714B, 724B) have a lower magnetic permeability than the first portion (71, 71A, 711B, 721B) and the second portion (72, 72A, 712B, 722B).

According to this aspect, the auxiliary yoke (7, 7A, 7B) includes the low magnetic permeability portion (74, 74A, 714B, 724B). Therefore, the weight of the auxiliary yoke (7, 7A, 7B) can be reduced as compared with the case where the low magnetic permeability portions (74, 74A, 714B, 724B) are made of a magnetic material, and the electromagnet device can be manufactured. It is possible to reduce the weight of (5, 5A, 5B).

In the electromagnet device (5, 5B) of the second aspect, in the first aspect, the second surface (62) is the surface of the movable member (movable iron cores 53, 53B).

According to this aspect, the magnetic resistance between the permanent magnets (58, 58B) and the movable member can be reduced by the auxiliary yoke (7, 720B).

In the electromagnet device (5, 5A, 5B) of the third aspect, in the first or second aspect, the auxiliary yoke (7, 7A, 7B) is fixed to the permanent magnet (58, 58A, 58B). ing.

According to this aspect, compared with the case where the auxiliary yoke is fixed to the movable member (movable iron cores 53, 53A, 53B), the permanent magnets (58, 58A, 58B) and the auxiliary yoke when the movable member moves. The time change of the magnetic gap length between (7, 7A, 7B) becomes small (or disappears). Therefore, it is possible to stabilize the operation of the electromagnet device (5, 5A, 5B).

In the electromagnet device (5, 5A, 5B) of the fourth aspect, in any one of the first to third aspects, in the auxiliary yoke (7, 7A, 7B), the first portion (71, 71A, 711B, 721B) and the second portion (72, 72A, 712B, 722B) connecting portion (73, 73A, 713B, 723B) is curved.

According to this aspect, the production of the auxiliary yokes (7, 7A, 7B) becomes easier than in the case where there is no curved portion.

In the electromagnet device (5, 5A, 5B) of the fifth aspect, in any one of the first to fourth aspects, the permanent magnets (58, 58A, 58B) are annular and the auxiliary yoke (7, 7A). , 7B) has a ring shape.

According to this aspect, it is possible to symmetrically generate the second magnetic flux (M2) by the permanent magnets (58, 58A, 58B).

In the electromagnet device (5, 5A, 5B) of the sixth aspect, in any one of the first to fifth aspects, the auxiliary yoke (7, 7A, 7B), the movable member (movable iron core 53, 53A, 53B). The fixing member (first yoke plates 541, 541A, fixed iron core 59B) constitutes a magnetic circuit (second magnetic circuit) through which the second magnetic flux (M2) of the permanent magnets (58, 58A, 58B) passes. ..

According to this aspect, the magnetic resistance of the magnetic path of the second magnetic flux (M2) can be reduced.

In the electromagnet device (5, 5A, 5B) of the seventh aspect, in any one of the first to sixth aspects, the fixed member (first yoke plate 541) in the movable member (movable iron cores 53, 53A, 53B). , 541A and the fixed iron core 59B), the direction of the first magnetic flux (M1) and the direction of the second magnetic flux (M2) are the same.

According to this aspect, the movement of the movable member by the force acting on the movable member by the first magnetic flux (M1) by the force acting on the movable member (movable iron cores 53, 53A, 53B) by the second magnetic flux (M2). Can be assisted.

In the electromagnet device (5, 5A, 5B) of the eighth aspect, in any one of the first to seventh aspects, when the exciting coil (51, 51A, 51B) is not energized, the movable member (movable iron core 53, 53A, 53B) and the fixing members (first yoke plates 541, 541A, fixed iron core 59B) have gaps (G1, G2). The permanent magnets (58, 58A, 58B) face the gaps (G1, G2) when viewed from the direction orthogonal to the direction in which the movable member moves with respect to the fixed member.

According to this aspect, the second magnetic flux (M2) of the permanent magnets (58, 58A, 58B) passes through the gaps (G1, G2). Therefore, the second magnetic flux (M2) makes it possible to exert a force on the movable member (movable iron cores 53, 53A, 53B) in a direction in which the size of the gaps (G1, G2) changes.

The electromagnet device (5, 5A, 5B) of the ninth aspect includes the yoke plate (first yoke plates 541, 514A, 541B) according to any one of the first to eighth aspects. The yoke plate is arranged at the ends of the exciting coils (51, 51A, 51B) and constitutes a part of a magnetic circuit (first magnetic circuit) through which the first magnetic flux (M1) passes.

According to this aspect, the yoke plate can reduce the magnetic resistance of the magnetic path of the first magnetic flux (M1).

In the electromagnet device (5, 5A) of the tenth aspect, in the ninth aspect, the yoke plate (first yoke plate 541) functions as a fixing member.

According to this aspect, it is possible to reduce the number of parts as compared with the case where the fixing member is separately prepared.

The electromagnet apparatus (5, 5A, 5B) of the eleventh aspect is the ninth or tenth aspect, wherein at least a part of the second magnetic flux (M2) of the permanent magnets (58, 58A, 58B) is the first magnetic flux. A magnetic member that guides the magnetic circuit (first magnetic circuit) through which the magnetic flux (M1) passes is further provided.

According to this aspect, by guiding at least a part of the component (M22) of the second magnetic flux (M2) to the first magnetic circuit, the second magnetic flux (passes through the other portions (for example, the gaps G1 and G2) ( It becomes possible to prevent the component (M21) of M2) from becoming too large.

In the electromagnet device (5B) of the twelfth aspect, in any one of the first to ninth aspects, the fixing member (fixed iron core 59B) is a hollow cylindrical shape extending along the central axis of the exciting coil (51B). is there.

According to this aspect, it is possible to realize the electromagnet device (5B) including the hollow cylindrical fixing member (fixed iron core 59B).

In the electromagnet device (5, 5A, 5B) of the thirteenth aspect, in any one of the first to twelfth aspects, the low magnetic permeability portion (74, 74A, 714B, 724B) is a space.

According to this aspect, it is possible to dispose another member in the low magnetic permeability portion (74, 74A, 714B, 724B), and it is possible to reduce the size of the electromagnet device (5, 5A, 5B). Become.

The electromagnet device (5, 5A, 5B) of the fourteenth aspect includes the coil bobbin (52, 52A) around which the winding of the exciting coil (51, 51A) is wound in the thirteenth aspect. The coil bobbin (52, 52A) has a first winding portion (524, 524A) and a second winding portion (525, 525A) arranged along the axial direction of the exciting coil (51, 51A). The first winding portion (524, 524A) overlaps with the permanent magnet (58, 58A) when viewed from a direction orthogonal to the axial direction of the exciting coil (51, 51A). The diameter of the outer peripheral surface of the second winding portion (525, 525A) is smaller than the diameter of the outer peripheral surface of the first winding portion (524, 524A). At least a part of the second winding portion (525, 525A) is located in the low magnetic permeability portion (74, 74A) of the auxiliary yoke (7, 7A).

According to this aspect, the size of the electromagnet device (5, 5A) can be reduced by positioning the second winding portion (525, 525A) in the low magnetic permeability portion (74, 74A) which is a space. Is possible.

The electromagnetic relay (1, 1A, 1B) of the fifteenth aspect is the electromagnet device (5, 5A, 5B) of any one of the first to fourteenth aspects, a fixed contact (211), and a movable contact (222). ) And a drive shaft (25, 25A, 25B). The movable contact (222) is movable between a position where it contacts the fixed contact (211) and a position where it separates from it. The drive shafts (25, 25A, 25B) are connected to the movable member. The movable shafts (25, 25A, 25B) move the movable contact (222) according to the movement of the movable member.

According to this aspect, it is possible to realize the electromagnetic relay (1, 1A, 1B) including the electromagnet device (5, 5A, 5B).

The configurations according to the second to fourteenth aspects are not essential for the electromagnet device (5, 5A, 5B) and can be omitted as appropriate.

1, 1A, 1B Electromagnetic relay 211 Fixed contact 222 Movable contact 25, 25A, 25B Drive shaft 5, 5A, 5B Electromagnet device 51, 51A, 51B Exciting coil 52, 52A Coil bobbin 524, 524A 1st winding part 525, 525A No. 2 winding parts 53, 53A, 53B movable iron core (movable member)
541, 541A First yoke plate (fixing member, yoke plate)
58, 58A, 58B Permanent magnet 59B Fixed iron core (fixing member)
7, 7A, 7B Auxiliary yoke 71, 71A, 711B, 721B First part 72, 72A, 712B, 722B Second part 74, 74A, 714B, 724B Low magnetic permeability part G1, G2 Gap M1 First magnetic flux M2 Second Magnetic flux

Claims (15)

An exciting coil for generating a first magnetic flux by energizing,
A fixing member formed of a magnetic material,
A movable member formed of a magnetic material and moving with respect to the fixed member in response to the generation of the first magnetic flux;
A permanent magnet that generates a second magnetic flux;
A first portion facing in a first direction a first surface which is a magnetic pole surface of the permanent magnet, and a second portion facing a second surface which is one of the fixed member and the movable member in a second direction. An auxiliary yoke having two parts, and the second magnetic flux passing through the first part and the second part;
Equipped with
The normal direction of the first surface and the normal direction of the second surface are different,
In the first direction, the auxiliary yoke has a projection area of a surface of the first portion facing the first surface in the second direction and a surface of a surface of the second portion facing the second surface in the second direction. And a low magnetic permeability portion having a magnetic permeability smaller than that of the first portion and the second portion in a portion where the projected area of
Electromagnetic device. The second surface is a surface of the movable member,
The electromagnet device according to claim 1. The auxiliary yoke is fixed to the permanent magnet,
The electromagnet device according to claim 1. In the auxiliary yoke, a portion connecting the first portion and the second portion is curved.
The electromagnet device according to claim 1. The permanent magnet has a ring shape, and the auxiliary yoke has a ring shape.
The electromagnet device according to claim 1. The auxiliary yoke, the movable member, and the fixed member constitute a magnetic circuit through which the second magnetic flux of the permanent magnet passes.
The electromagnet device according to claim 1. On the surface of the movable member facing the fixed member, the direction of the first magnetic flux and the direction of the second magnetic flux are the same.
The electromagnet device according to any one of claims 1 to 6. When the exciting coil is not energized, there is a gap between the movable member and the fixed member,
The permanent magnet faces the gap when viewed from a direction orthogonal to a direction in which the movable member moves with respect to the fixed member,
The electromagnet device according to any one of claims 1 to 7. A yoke plate disposed at an end of the exciting coil and forming a part of a magnetic circuit through which the first magnetic flux passes,
The electromagnet device according to any one of claims 1 to 8. The yoke plate functions as the fixing member,
The electromagnet device according to claim 9. Further comprising a magnetic member that guides at least a part of the second magnetic flux of the permanent magnet to the magnetic circuit through which the first magnetic flux passes,
The electromagnet device according to claim 9 or 10. The fixing member is a hollow cylindrical shape extending along the central axis of the exciting coil,
The electromagnet device according to any one of claims 1 to 9. The low magnetic permeability portion is a space,
The electromagnet device according to claim 1. A coil bobbin around which the winding of the exciting coil is wound,
The coil bobbin has a first winding portion and a second winding portion arranged along the axial direction of the exciting coil,
The first winding portion overlaps with the permanent magnet when viewed from a direction orthogonal to the axial direction of the exciting coil,
The diameter of the outer peripheral surface of the second winding portion is smaller than the diameter of the outer peripheral surface of the first winding portion,
At least a part of the second winding portion is located in the low magnetic permeability portion,
The electromagnet device according to claim 13. An electromagnet device according to any one of claims 1 to 14,
Fixed contact,
A movable contact that is movable between a position in contact with the fixed contact and a position in which it separates from the fixed contact,
A drive shaft that is connected to the movable member and moves the movable contact according to the movement of the movable member;
With
Electromagnetic relay.

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