JP6238620B2 - Electromagnet device - Google Patents

Description

  The present invention relates to an electromagnet device used for an operating mechanism of a switching device such as a circuit breaker.

A conventional electromagnet device is composed of an electromagnetic coil, a movable core passing through the electromagnetic coil, and a fixed core disposed so as to cover the periphery of the electromagnetic coil. The electromagnetic coil is excited to attract the movable core, and the movable core and the fixed core are A magnetic flux generated by a permanent magnet is passed through the surface facing the center leg to maintain the attracted state, and a current in the opposite direction to that during suction is passed through the electromagnetic coil to release the movable iron core.
In this electromagnet device, the central part of at least one of the movable iron core or the central leg is a gap, and the magnetic flux generated by the permanent magnet is concentrated on the outer peripheral part. Since the flow concentrates around the iron core, the opening speed increases (for example, see Patent Document 1).

JP 2003-151826 A

In such a conventional electromagnet device, the permanent magnet provided in the fixed iron core is directly opposed to the movable iron core, and the movable iron core is attracted to the fixed iron core according to the distance between the movable iron core and the permanent magnet. Power is generated. Accordingly, when the characteristics of the permanent magnet change due to changes in ambient temperature, the attractive force to the movable iron core changes, and the opening speed changes. As a result, there is a problem that the opening speed cannot be controlled within a predetermined specification range.
Also, when an opening electromagnetic coil is wound directly around the permanent magnet, and the magnetic flux generated by the opening electromagnetic coil is applied to the permanent magnet, the permanent magnet is demagnetized and attracted between the movable iron core and the fixed iron core. The holding force was reduced, which hindered stable closing of the switchgear.
In order to solve the above-described problems, the present invention is arranged such that an electromagnetic coil is arranged at a facing portion between the fixed iron core and the movable iron core so that the magnetic flux of the permanent magnet can be effectively canceled by the magnetic flux of the electromagnetic coil. is there.

An electromagnet device according to the present invention includes a switch having a movable contact and a fixed contact, a movable iron core connected to the movable contact of the switch, the movable contact and the fixed contact wound around the movable iron core with a gap. during the closing operation, closing electromagnetic coil for moving the movable iron core in closing direction, the fixed iron core contacting and separating the movable iron core while being arranged so as to face the movable core, arranged in a fixed iron core of this is when the above movable iron core to the fixed iron core in contact with a permanent magnet for generating a magnetic attraction force for holding the movable iron core to the contact position, and disposed near the opposing portion between the movable iron core and the fixed iron core An electromagnetic coil for opening is provided, and the fixed iron core is formed in a U shape by a pair of second fixed iron core members arranged in parallel on both sides, and a first fixed iron core member connecting the two second iron core members, And the movable iron core And a central core member and a pair of branch core members extending from both sides of the core core member to form a T-shape. The branch core members are opposed to and separated from the second fixed core members, respectively. The core core member is opposed to and separated from the first fixed core member, and the permanent magnet is interposed in a connecting portion between the first fixed core member and the second fixed core member, and the opening electromagnetic coil Is a position spaced apart from the permanent magnet, in the vicinity where the branch core member of the movable core and the second fixed core member face each other, and the core core member of the movable core and the first fixed core member Are arranged in the vicinity of each other facing each other.

  According to the electromagnet device of the present invention, the magnetic flux of the permanent magnet can be canceled efficiently by disposing the electromagnetic coil at the opposed portion of the fixed iron core and the movable iron core. Variations in the opening speed of the switchgear can be suppressed.

It is sectional drawing of the switchgear which employ | adopted the electromagnet apparatus in Embodiment 1 of this invention. It is explanatory drawing which shows the magnetic flux of a movable iron core, a fixed iron core, and a permanent magnet when the electromagnetic coil for closing is energized and the movable iron core of an electromagnet apparatus reaches the advance position. It is explanatory drawing which shows the magnetic flux of the electromagnetic coil for opening, a movable iron core, a fixed iron core, and a permanent magnet when the electromagnetic coil for opening is energized. It is explanatory drawing which shows the magnetic flux of the electromagnetic coil for opening in the opening operation of the electromagnet apparatus in Embodiment 1 of this invention, a fixed iron core, and a permanent magnet. It is explanatory drawing which shows the magnetic flux of the electromagnetic coil for closing in closing operation of the electromagnet apparatus in Embodiment 1 of this invention, a fixed iron core, and a permanent magnet.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1.
FIG. 1 is a cross-sectional view of a switchgear that employs an electromagnet device according to Embodiment 1, and FIGS. 2 to 5 are conceptual diagrams illustrating the concept of the electromagnet device and explaining its operation.
Hereinafter, the first embodiment will be described with reference to FIGS.
In FIG. 1, the switchgear employing the electromagnet device in Embodiment 1 is displaced in a direction in which the movable contact 2 of the vacuum valve 3 is in contact with or separated from the fixed contact 1, and the vacuum valve 3 having the fixed contact 1 and the movable contact 2. An electromagnet 4 to be connected, a connecting device 5 that connects the vacuum valve 3 and the electromagnet 4, and an opening spring 6 that is an urging member that urges the movable contact 2 in a direction away from the fixed contact 1.

  In the vacuum valve 3, the fixed contact 1 and the movable contact 2 are accommodated in the insulating container 3a, and one end of the movable electrode bar 3b fixed to the movable contact 2 is led out from the insulating container 3a to the outside through the connecting device 5. It is connected to the movable side of the electromagnet 4. As a result, the movable contact 2 moves and displaces in the axial direction of the vacuum valve 3 (same as the central axis of the closing electromagnetic coil 10, hereinafter simply referred to as “axial direction Y”). When the movable contact 2 is in contact with the fixed contact 1, the contact is closed, and when the movable contact 2 is separated, the contact is opened. The inside of the vacuum valve 3 is kept in a vacuum in order to improve the arc extinguishing ability between the movable contact 1 and the fixed contact 2.

  The electromagnet 4 includes a U-shaped fixed iron core 7 (described later), a T-shaped movable iron core 8 (described later) disposed opposite to and fixed to the fixed iron core 7 as described later, and a movable iron core. 8 is provided in the fixed core 7 and the drive shaft 9 which is provided through the central portion of the motor 8 and is fixed (fitted) to the movable iron core 8 and penetrates the through hole of the fixed iron core 7 so as to be movable (axial direction Y). A closing electromagnetic coil 10 (described later) that generates a magnetic field by energization, an opening electromagnetic coil 101 (described later) disposed at each facing portion of the fixed iron core 7 and the movable iron core 8, the movable iron core 8 and the fixed iron core 7, Two permanent magnets 11 (described later) provided so as to be interposed between the fixed iron core 7 side, i.e., the intermediate portion of the fixed iron core 7, and a column 12 for fixing the fixed iron core 7, An opening side plate 13 and a closing side plate 13 arranged at both ends of the support column 12. And an over door 14. The movable iron core 8 can be displaced by being driven in the axial direction Y of the drive shaft 9 with respect to the fixed iron core 7.

Furthermore, bearings 15a and 15b of the drive shaft 9 are provided in portions where the drive shaft 9 penetrates in the opening side plate 13 and the closing side plate 14, respectively.
A spring receiver 16 is fixed to the tip end side of the drive shaft 9 protruding outward from the opening side plate 13, and the shaft portion of the drive shaft 9 between the opening side plate 13 and the spring receiver 16 is fixed. In addition, the opening spring 6 (the biasing body) described above is inserted. The opening spring 6 is, for example, a compressed coil spring, and generates an elastic repulsive force in the axial direction Y between the opening side plate 13 and the spring receiver 16.

Next, the configuration of the electromagnet 4 will be described.
The fixed iron core 7 and the movable iron core 8 are configured by laminating thin plates.
The fixed iron core 7 is provided in parallel with the first fixed iron core member 7a, which is a horizontal iron core extending in a direction orthogonal to the axial direction Y, on both sides of the end of the first fixed iron core member 7a, and the first fixed iron core member 7a. And a second fixed iron core member 7b, which is a pair of vertical iron cores that are connected to each other through the permanent magnets 11 and extend in the axial direction Y from the end portion.
Further, as described above, the permanent magnet 11 is interposed between the both ends of the first fixed iron core member 7a and the intermediate portion of the fixed iron core 7, which is a connecting portion between the second fixed iron core member 7b. Furthermore, the fixed iron core 7 is sandwiched between the columns 12 from both sides of the plate surface, that is, both surfaces in the stacking direction, and is fastened and fixed to the columns 12.

On the other hand, the movable iron core 8 is arranged along the axial direction Y in the central portion, and is inserted into and fitted into the drive shaft 9, and the direction perpendicular to the axial direction Y from the side surface of the basic iron core member 8a. And a pair of branch iron core members 8b extending in opposite directions toward each other. The movable iron core 8 is integrated by being fastened by a plurality of bolts 18 passed in the stacking direction and nuts (not shown) screwed to the bolts 18. Further, the movable iron core 8 is moved away from the fixed iron core 7 and comes into contact with the open side plate 13 (upward position in FIG. 1), and the advanced position (in FIG. 1 lower position) that contacts (adsorbs) the fixed iron core 7. ) Between the main core member 8a and the branch core member 8b. The main core member 8a and the branch core member 8b are moved from the retracted position to the advanced position on the central axis of the closing electromagnetic coil when the closing electromagnetic coil 10 is energized. Is contacted (abutted) with the first fixed core member 7a and the second fixed core member 7b to form a magnetic path for a permanent magnet (see paragraph 0016).
The material of the fixed iron core 7 and the movable iron core 8 may be a magnetic material having a high magnetic permeability, and examples thereof include steel, electromagnetic soft iron, silicon steel, ferrite, and permalloy.
Further, as the material of the drive shaft 9, a material having a low magnetic permeability (low magnetic material), such as stainless steel, is used.

The permanent magnet 11 has an N pole and an S pole (a pair of magnetic poles). One magnetic pole faces the first fixed iron core member 7a, and the other magnetic pole faces the second fixed iron core member 7b. Opposite.
The permanent magnet 11 generates a holding magnetic flux for holding the movable iron core 8 in the forward position, and the two magnetic bodies (the movable iron core 8 and the fixed iron core 7) are in contact with each other on a plane perpendicular to the moving direction. When the magnetic flux in the same direction as the moving direction is generated, the attractive force of the permanent magnet 11 is generated.

The closing electromagnetic coil 10 is disposed so as to pass through the space between the core core member 8 a of the movable core 8 and the second fixed core member 7 b of the fixed core 7. In the example of the first embodiment, the closing electromagnetic coil 10 has a cylindrical shape and is wound around the core core member 8a with a small gap in the projection plane in the axial direction Y. .
The closing electromagnetic coil 10 passes through the fixed iron core 7 and the movable iron core 8 as shown in FIG. 5 when temporarily energized during the closing operation in which the movable iron core 8 is moved from the retracted position to the advanced position. A magnetic flux Φ ₁₀ is generated and acts as an attractive force of the movable iron core 8 (described later).

The opening electromagnetic coil 101 applies the magnetic flux Φ ₁₁ of the permanent magnet 11 that generates a force for attracting and holding the movable core 8 during an opening operation, which will be described later, to move the movable core from the forward position to the backward position. In order to cancel with the magnetic flux Φ ₁₀₁ of the coil, as shown in each figure, it is arranged at all the locations of the facing portion between the movable iron core 8 and the fixed iron core 7 through which the magnetic flux Φ ₁₁ passes.
In the first embodiment, the opening electromagnetic coil 101 is located away from the permanent magnet 11 and is disposed at the following three locations where the fixed iron core 7 and the movable iron core 8 face each other.
That is, the opening electromagnetic coil 101 includes two locations in the vicinity where the branch core member 8b of the movable core and the second fixed core member 7b face each other, and the core core member 8a and the first fixed core member 7a of the movable core. Are arranged as follows at one location in the vicinity of each other to cancel the magnetic flux Φ ₁₁ of the permanent magnet 11.

As shown in FIGS. 2 and 3, the one opening electromagnetic coil 101 has the movable iron core 8 displaced to the forward position, and the first movable surface 8a1 of the core iron core member 8a is replaced by the first fixed iron core member 7a. When abutting against the first fixed surface 7a1, the first fixed surface 7a1 is located in the vicinity of the abutting portion (opposed portion of the fixed iron core 7 and the movable iron core 8) and surrounds the core core member 8a in a wound state. It is arrange | positioned on the upper surface of.
In addition, as shown in FIGS. 2 and 3, the two opening electromagnetic coils 101 have the movable iron core 8 displaced to the forward position, and the second movable surface 8b2 of the branch iron core member 8b becomes the second fixed iron core member. When the second fixed surface 7b2 of 7b is closest to the second fixed surface 7b2 through a small gap, the second fixed surface 7b2 is in the vicinity of the approaching portion (the opposed portion of the fixed core 7 and the movable core 8) and surrounds the second fixed core member 7b. Each is wound around the fixed core member 7b.

Next, a connecting portion between the electromagnet 4 and the vacuum valve 3 will be described with reference to FIG.
The electromagnet 4 is supported on a plate-like support member 19 via an attachment column 20.
The connecting device 5 for connecting the movable electrode rod 3b fixed to the movable contact 2 of the vacuum valve 3 and the drive shaft 9 of the electromagnet 4 includes an insulating rod 21 connected to the movable electrode rod 3b, and the insulating rod 21 and the drive. The contact rod 22 interposed between the shaft 9 and the connecting rod 21a connected to the insulating rod 21 passes through the support member 19 and is connected to the support member 19 which is a part of the gas container. It has a bellows 23 provided by connecting the connecting rod 21a and the support member 19 so that 21a can move in an airtight manner. The bellows 23 may be unnecessary depending on the configuration of the support member 19.

The contact pressure device 22 includes a spring frame 24 fixed to the end portion of the connecting rod 21a, a locking plate 25 fixed to the lower end portion of the drive shaft 9 and disposed in the spring frame 24, and the spring frame 24 and the stopper. A contact pressure spring 26 is inserted between the plate 25 in a compressed state. The contact pressure spring 26 urges the drive shaft 9 in a direction away from the insulating rod 21. The drive shaft 9 can be displaced in the axial direction Y together with the locking plate 25, and the displacement is regulated by the engagement of the locking plate 25 with the spring frame 24.
In FIG. 1, the axis of the electromagnet 4 and the axis of the vacuum valve are aligned, but a configuration in which the direction is changed by interposing a lever or the like in the connecting device 5 may be used.

Next, the opening / closing operation of the fixed contact 1 and the movable contact 2 will be described.
First, the closing operation will be described.
In FIG. 1, when the movable contact 2 is in an open state away from the fixed contact 1, the movable iron core 8 is in the retracted position by the biasing force of the open spring 6.
Due to the closing, when the control board (not shown) is energized to the closing electromagnetic coil 10, a magnetic flux Φ ₁₀ passing through the fixed iron core 7 and the movable iron core 8 is generated as shown in FIG. Is attracted to the fixed iron core 7 and is displaced from the retracted position toward the advanced position against the load of the opening spring 6. As a result, the movable contact 2 moves toward the fixed contact 1.

Thereafter, when the movable contact 2 comes into contact with the fixed contact 1, the movement of the movable contact 2 stops. However, the movable core 8 continues to be further displaced until the core core member 8a contacts the first fixed core member 7a, whereby the contact pressure spring 26 is contracted and the core core member 8a contacts the first fixed core member 7a. At the time of contact, the movable iron core 8 reaches the forward movement position, and the movable contact 2 is pressed against the fixed contact 1 with a predetermined pressing force to complete the closing operation. Then, after the closing operation is completed, the energization to the closing electromagnetic coil 10 is stopped. The reason why the energization to the closing electromagnetic coil 10 is stopped after the closing operation is completed in this manner is that the energization to the closing electromagnetic coil 10 is performed when the movable contact 2 and the fixed contact 1 come into contact with each other. If the contact pressure spring 26 is stopped, the force for compressing the contact pressure spring 26 is lost, and if the contact pressure spring 26 cannot be compressed, the closing operation is hindered, so a time lag is provided to prevent this. is there.
When the movable iron core 8 reaches the forward movement position, as shown in FIG. 2, the movable iron core 8 and the fixed iron core 7 are brought into contact with each other on a plane perpendicular to the moving direction, so that an attractive force of the permanent magnet 11 is generated. after de-energization of the electromagnetic coil 10 is also advanced position held suction state of the movable iron core 8 relative to the fixed iron core 7 by holding the magnetic flux [Phi ₁₁ of the permanent magnet 11 is held.

Next, the opening operation will be described.
The opening of the fixed contact 1 and the movable contact 2 is performed by releasing the holding of the advance position of the movable iron core 8.
Sucking and holding force for holding the movable iron core 8 in the forward position, the above-described manner to the first movable surface 8a1 of the magnetic flux [Phi ₁₁ of the permanent magnet 11 shown in FIG. 2 is passing through the first fixing surface 7a1, and the 2 is generated at each facing portion of the movable surface 8b2 and the second fixed surface 7b2.

When starting the opening operation from the closed state, as shown in FIG. 3, the opening electromagnetic coil 101 is energized from the control board, and the magnetic flux Φ ₁₀₁ in the direction opposite to the magnetic flux Φ ₁₁ of the permanent magnet 11 is opened. The electromagnetic coil 101 is used. The permanent magnets passing through the opposing portions of the first movable surface 8a1 and the first fixed surface 7a1, and the second movable surface 8b2 and the second fixed surface 7b2 by the magnetic flux Φ ₁₀₁ generated by the opening electromagnetic coils 101. to cancel the magnetic flux Φ ₁₁ of the magnet 11. By this canceling action, the suction holding force between the movable iron core 8 and the fixed iron core 7 is reduced, and each load of the contact pressure spring 26 and the opening spring 6 exceeds the magnetic attraction force, so that the movable iron core 8 moves to the retracted position. Move and start opening operation.

In the initial stage of displacement, the movable contact 2 remains pressed against the fixed contact 1.
Thereafter, when the displacement toward the retracted position of the movable iron core 8 proceeds, the retaining plate 25 is engaged with the spring frame 24. Thereby, the movable contact 2 is displaced in a direction away from the fixed contact 1. The movable iron core 8 is further displaced and brought into contact with and close contact with the opening side plate 13, and the opening operation is completed when the retracted position shown in FIGS. 1 and 4 is reached.

Next, the situation during the opening operation will be described with reference to FIG.
Flux [Phi ₁₀₁ of opening electromagnetic coil 101 when starting the opening operation, the first movable surface 8a1 and the first fixing surface 7a1 flux [Phi ₁₁ of the permanent magnet 11 is passed, and a second movable surface 8b2 first permanent magnets affecting the movable core 8 in opening the middle of the route (suction force corresponding to the distance between the movable iron core 8 fixed iron core 7) as well as canceling the magnetic flux [Phi ₁₁ by the permanent magnet 11 at each opposing portion of the second fixing surface 7b2 11 magnetic flux Φ ₁₁ is cancelled.
Further, since the movable iron core 8 in the path in the middle of the opening is not subjected to the attractive force due to the magnetic flux Φ ₁₁ of the permanent magnet 11, it is not affected by the change in the amount of magnetic flux of the permanent magnet 11 that changes with temperature.
In the prior art, the influence of the permanent magnet on the opening speed of the movable iron core 8 could not be avoided, but in the first embodiment, a stable opening speed can be obtained without being influenced by the temperature change.

  Since the permanent magnet 11 is arranged between the first fixed iron core member 7a and the second fixed iron core member 7b (opposing surface), the permanent magnet 11 is attracted by the opposing portions where the opening electromagnetic coil 101 is arranged, that is, by the permanent magnet 11. There is an advantage that the first movable surface 8a1 and the first fixed surface 7a1 that generate force and the second movable surface 8b2 and the second fixed surface 7b2 can be arranged away from each other.

The direction of the magnetic flux Φ ₁₀₁ generated by the opening electromagnetic coil 101 is a direction in which the magnetic force of the permanent magnet 11 is weakened (demagnetization).
In the case of a configuration in which the opening electromagnetic coil is wound directly around the permanent magnet and the magnetic flux generated by the opening electromagnetic coil is applied to the permanent magnet, the permanent magnet is demagnetized to attract between the movable iron core and the fixed iron core. Since the holding force is reduced, there is a drawback that prevents stable closing of the switching device.

On the other hand, in the first embodiment, the permanent magnet 11 is disposed inside the fixed iron core 7 away from the opening electromagnetic coil 101 (at the connecting portion between the both ends of the first fixed iron core member 7a and the second fixed iron core member 7b). Since the magnetic flux Φ ₁₀₁ of the opening electromagnetic coil 101 is attenuated by the effect of the distance, a magnetic field in the direction of demagnetizing the permanent magnet 11 is applied. 11 demagnetization can be prevented. (As shown in FIGS. 3 and 4, the magnetic flux Φ ₁₀₁ of the opening electromagnetic coil 101 has a strong magnetic flux around the opening electromagnetic coil 101, and has a small influence on the portion where the permanent magnet 11 is disposed). Accordingly, since the suction holding force between the movable iron core 8 and the fixed iron core 7 does not decrease, the closing holding force of the switchgear can be stabilized.
Further, by separating the opening electromagnetic coil 101 and the permanent magnet 11 by a distance equal to or longer than the distance on the short side of the outer periphery of the opening electromagnetic coil 101, the distance effect is increased and demagnetization can be effectively suppressed.
Further, the movable iron core 8 is not affected by the change in the amount of magnetic flux of the permanent magnet 11 that changes depending on the temperature, and can obtain a stable opening speed that is not affected by the temperature change of the permanent magnet 11. Furthermore, since the permanent magnet 11 can be disposed at a position away from the facing portions of the fixed iron core 7 and the movable iron core 8, the closing holding force of the switchgear can be stabilized.

Further, the first movable surface 8a1 and the first fixing surface 7a1 of the suction holding force through flux [Phi ₁₁ of the permanent magnet 11 is generated, and a second movable surface 8b2 each facing portion of the second fixing surface 7b2 By arranging the opening electromagnetic coil 101, it is only necessary to cancel the magnetic flux Φ ₁₁ of the permanent magnet 11 at each facing portion, so that the magnetic flux Φ ₁₁ of the permanent magnet 11 can be canceled efficiently. Therefore, the opening electromagnetic coil 101 can be miniaturized.

At this time, by making the dimension of the opening electromagnetic coil 101 shorter than the moving distance of the movable iron core 8 in the moving direction (axial direction Y) of the movable iron core 8, the magnetic flux of the opening electromagnetic coil 101 is changed to the movable iron core 8. The influence which acts on can be suppressed.
This is because when the magnetic flux Φ ₁₀₁ of the opening electromagnetic coil 101 is separated in the axial direction of the electromagnetic coil, the magnetic flux spreads and the attractive force rapidly decreases. (As shown in FIGS. 3 and 4, the magnetic flux around the opening electromagnetic coil 101 is strong in the periphery of the opening electromagnetic coil 101).

  Since the electromagnetic coil for opening 101 has a high magnetic flux density at the inner part of the cylinder, a certain range of the electromagnetic coil has a large attractive force and has a great influence on the opening speed. By setting the coil length in the central axis direction of the opening electromagnetic coil 101 to 50% or less with respect to the moving distance of the movable iron core 8 in the reciprocating direction, 50% or more of the total moving distance is less affected by the electromagnetic coil. Therefore, the influence on the opening speed can be suppressed by 50% or more, and a stable opening speed can be obtained.

  The opening electromagnetic coil 101 has a temperature-dependent resistance value, and the attractive force changes when the energization current value changes depending on the temperature. The influence of this temperature can be suppressed, and a stable opening speed can be obtained regardless of the temperature.

  In the present invention, the embodiments can be appropriately modified and omitted within the scope of the invention.

1: fixed contact, 2: movable contact, 3: vacuum valve, 3a: insulating container,
3b: movable electrode rod, 4: electromagnet, 5: coupling device, 6: opening spring,
7: Fixed iron core, 7a: First fixed iron core member,
7a1: the first fixed surface of the first fixed core member 7a,
7b: 2nd fixed iron core member, 7b2: 2nd fixed surface of 2nd fixed iron core member 7b,
8: movable iron core, 8a: core iron core member, 8a1: first movable surface of the core iron core member 8a,
8b: Branch iron core member, 8b2: Second movable surface of the branch iron core member 8b, 9: Drive shaft,
10: Electromagnetic coil for closing, 101: Electromagnetic coil for opening, 11: Permanent magnet,
12: support, 13: open side plate, 14: closed side plate,
15a, 15b: bearing, 16: spring bearing, 18: bolt, 19: support member,
20: Mounting column, 21: Insulating rod, 22: Pressure contact device, 23: Bellows,
24: Spring frame, 25: Stop plate, 26: Contact pressure spring.

Claims (2)

A switch having a movable contact and a fixed contact, a movable iron core connected to the movable contact of the switch, the movable iron wound around the movable iron core with a gap, and the movable contact when the movable contact and the fixed contact are closed. closing electromagnetic coil for moving the core in the closing direction, the fixed iron core, is disposed on the fixed iron core of this the movable iron core to the fixed iron core contacting and separating the movable iron core while being arranged so as to face the movable core A permanent magnet that generates a magnetic attraction force that holds the movable iron core in a contact position, and an opening electromagnetic coil disposed in the vicinity of the facing portion between the movable iron core and the fixed iron core , The fixed iron core is formed in a U-shape by a pair of second fixed iron core members arranged in parallel on both sides and a first fixed iron core member that couples both the second fixed iron core members, and the movable iron core has a central shape. Core core member and this A pair of branch core members extending from the main core member to both sides are formed in a T-shape. The branch core members are opposed to and away from the second fixed core members, and the main core member is fixed to the first core. A position where the permanent magnet is interposed between the first fixed core member and the second fixed core member, and the opening electromagnetic coil is spaced apart from the permanent magnet. In the vicinity where the branch core member of the movable core and the second fixed core member face each other, and in the vicinity where the core core member of the movable core and the first fixed core member face each other, An electromagnet device characterized by being arranged respectively . The coil length in the central axis direction of the opening electromagnetic coil is the moving distance in the reciprocating direction of the movable iron core.
The electromagnet device according to claim 1 , wherein the electromagnet device is 50% or less .

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