JP2012199276A - Electromagnetic actuator and switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sophisticated and inexpensive electromagnetic actuator which can reduce eddy current loss of a fixed iron core and enables easy assembly of the fixed iron core and a movable iron core, and a switchgear using the electromagnetic actuator.SOLUTION: In an electromagnetic actuator, a stator is a laminated body formed by laminating steel plates. The stator comprises: a fixed iron core having two side leg parts, a yoke part interconnecting the side leg parts, and projections projecting inwardly from ends of the respective side leg parts; a coil installed on the inner peripheral side of the fixed iron core; a support member having a support hole installed between the projections; and permanent magnets installed on the outer peripheral sides of the projections. A movable iron core comprises a magnetic plate-shaped part and a columnar part. The plate-shaped part is disposed opposing to the permanent magnets, and the columnar part is supported by the support hole of the support member, so as to arrange the movable iron core in the stator. A switchgear uses the electromagnetic actuator.

Description

  The present invention relates to an electromagnetic actuator and an opening / closing device using the electromagnetic actuator for an operation mechanism.

As an operation mechanism in a switching device such as a circuit breaker or a switch, a hydraulic operation mechanism, a spring operation mechanism, and an electromagnetic operation mechanism are known. In particular, the electromagnetic operation mechanism is used as, for example, an operation mechanism of a vacuum circuit breaker because the number of components is small and the mechanism can be simplified and the manufacturing cost can be reduced as compared with a hydraulic operation mechanism and a spring operation mechanism.
The electromagnetic operation mechanism is an operation mechanism using an electromagnetic actuator composed of a fixed iron core provided with a coil and a movable iron core movable relative to the fixed iron core.

There are roughly two types of electromagnetic actuators used in the operating mechanism of the switchgear.
The first type of electromagnetic actuator is a solenoid type electromagnetic actuator in which a cylindrical coil is installed on the inner peripheral side of a cylindrical fixed iron core, and a movable iron core that is movable in the vertical direction is inserted inside the coil. (For example, refer to Patent Document 1).
However, since this electromagnetic actuator is made of an integral steel material, each of the movable iron core and the fixed iron core, eddy currents are generated in the movable iron core and the fixed iron core during operation of the electromagnetic actuator, resulting in a large magnetomotive force loss. There was a problem that the operability of the movable iron core deteriorated. In addition, there has been a problem that it is necessary to increase the size of the fixed iron core, the coil, and the drive power supply in order to improve the operation of the movable iron core.

As a solenoid-type electromagnetic actuator that solves the above problems, an armature (movable iron core) is arranged concentrically with a steel cylinder provided at the center and a slight gap on the outer periphery of the cylinder. There is one formed by a first cylindrical body of steel and a second cylindrical body of steel disposed concentrically with a slight gap on the outer periphery of the first cylindrical body.
In this solenoid type electromagnetic actuator, since the armature is divided into a plurality of parts and the magnetic circuit is provided in a plurality, loss due to eddy current is suppressed (for example, see Patent Document 2).

Further, as a solenoid type electromagnetic actuator that solves the above problem, a yoke that is a fixed iron core is formed by arranging a large number of identically shaped yoke elements radially with respect to the axis of the yoke, There is one in which a plurality of core pieces made of silicon steel plates are overlapped so as to be radially arranged around the axis of the movable core.
In this solenoid-type electromagnetic actuator, both the fixed iron core and the movable iron core are formed of a plurality of pieces, so that eddy current loss between the fixed iron core and the movable iron core can be reduced (for example, Patent Document 3). reference).

The second type of electromagnetic actuator is an electromagnetic actuator using a fixed iron core formed by laminating at least thin plate pieces.
For example, as a second type electromagnetic actuator, a yoke (fixed core piece) formed by laminating frame-shaped yoke pieces (fixed core pieces) formed with protrusions at the center of a pair of opposing sides on the inner peripheral side An iron core), a first coil installed between the ceiling portion and the protruding portion, and a second coil installed between the bottom surface portion and the protruding portion, on the inner peripheral side of the two yokes, And an armature (movable iron core) inserted on the inner peripheral side of the second coil.
Since this electromagnetic actuator has a structure in which the fixed iron core is formed by laminating the fixed iron core pieces, eddy current loss of the fixed iron core can be suppressed (for example, see Patent Document 4).

Further, as a second type of electromagnetic actuator, a central leg portion formed by laminating a plurality of steel plates, a side leg portion provided on both sides thereof, and a yoke portion that communicates between the central leg portion and the side leg portion. There is an electromagnetic actuator including a fixed iron core, a coil wound around a central leg, and a movable iron core formed by laminating a plurality of steel plates and disposed between side legs of the fixed iron core.
Since this electromagnetic actuator has a structure in which a fixed iron core and a movable iron core are both laminated with a plurality of steel plates, eddy current loss in the fixed iron core and the movable iron core can be reduced (see, for example, Patent Document 5).

Japanese Patent Laid-Open No. 2003-151826 (page 4, FIG. 1) Japanese Patent Laid-Open No. 2008-066662 (Page 3, FIGS. 1 and 2) Japanese Examined Patent Publication No. 3-14209 (Page 2, Page 7, Figure 3, Figure 41) International Publication No. 95/07542 (Page 5, Page 6, Figure 1) JP 2001-237118 A (3rd page, FIG. 1 and FIG. 2)

In the solenoid-type electromagnetic actuator described in Patent Document 2, the movable iron core is divided and formed with a plurality of parts arranged concentrically with a gap, so the number of parts of the movable iron core is small. As the number of parts increases, the shape of each part becomes complicated, and the manufacturing cost of the movable core increases.
Further, in the solenoid-type electromagnetic actuator described in Patent Document 3, each of the fixed iron core and the movable iron core is formed by a plurality of pieces, and the plurality of pieces are radially formed with respect to the axis of each iron core. As a result, the number of parts of each iron core is increased, the assembly process of each iron core is complicated, high assembly accuracy is required, and the manufacturing cost of each iron core is increased.

  Moreover, the electromagnetic actuator described in Patent Document 4 is provided with a coil wound in a rectangular shape on a fixed iron core of two laminated bodies arranged to face each other with a predetermined gap therebetween, and the inner peripheral side of the coil Since the movable iron core is inserted into the center, it is indispensable to align the axis of the movable core with the axis of the fixed core, which increases the assembly process of the electromagnetic actuator and increases the assembly cost. There was a problem.

  Moreover, the electromagnetic actuator described in Patent Document 5 is configured such that the movable iron core of the laminated body is arranged between the side legs of the fixed iron core of the laminated body, and the axial center of the movable iron core and the axial center of the fixed iron core are also arranged. The alignment work is indispensable, and there is a problem that the assembly process of the electromagnetic actuator becomes long and the assembly cost increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce at least the eddy current loss of the fixed iron core, to facilitate the assembly of the fixed iron core and the movable iron core, and to It is an object of the present invention to obtain an electromagnetic actuator that does not require alignment work during assembly of the actuator, has high performance, and suppresses an increase in manufacturing cost, and a switchgear using the electromagnetic actuator.

  An electromagnetic actuator according to the present invention is an electromagnetic actuator that includes a stator, a movable iron core that is installed in a state in which it can reciprocate relative to the stator, and an output shaft fixed to the movable iron core. The stator is a laminated body formed by laminating steel plates, and has two side legs, a yoke part connecting one end of each side leg, and the other of each side leg. A fixed iron core having a substantially C-shape with a protrusion protruding inward from the end of the coil, a coil installed on the inner peripheral side of the fixed iron core, and a support member provided between the protrusions and having a support hole A permanent magnet installed on the outer peripheral side of the projecting portion, a movable iron core is formed of a plate-like portion and a cylindrical portion of the magnetic body, and the output shaft is on the cylindrical portion side. It extends, the plate-shaped part faces the permanent magnet, and the columnar part is a support hole of the support member It is supported, in which the movable iron core disposed in the stator.

  An electromagnetic actuator according to the present invention is an electromagnetic actuator that includes a stator, a movable iron core that is installed in a state in which it can reciprocate relative to the stator, and an output shaft fixed to the movable iron core. The stator is a laminated body formed by laminating steel plates, and has two side legs, a yoke part connecting one end of each side leg, and the other of each side leg. A fixed iron core having a substantially C-shape with a protrusion protruding inward from the end of the coil, a coil installed on the inner peripheral side of the fixed iron core, and a support member provided between the protrusions and having a support hole A permanent magnet installed on the outer peripheral side of the projecting portion, a movable iron core is formed of a plate-like portion and a cylindrical portion of the magnetic body, and the output shaft is on the cylindrical portion side. It extends, the plate-shaped part faces the permanent magnet, and the columnar part is a support hole of the support member It is supported, which is movable iron core disposed in the stator, with high operating efficiency, downsizing of the operation power, in which and the manufacturing cost can be reduced.

It is a perspective schematic diagram which shows the external appearance of the electromagnetic actuator concerning Embodiment 1 of this invention. It is a perspective schematic diagram which shows the state which the stator and the movable iron core isolate | separated in the electromagnetic actuator concerning Embodiment 1 of this invention. It is a schematic diagram which shows the AA cross section of the electromagnetic actuator shown in FIG. 1 concerning Embodiment 1 of this invention. In the electromagnetic actuator concerning Embodiment 1 of this invention, it is a figure which shows the relationship between the plate-shaped part of a movable iron core when a movable iron core rotates, and a permanent magnet. It is a cross-sectional schematic diagram of the electromagnetic actuator concerning Embodiment 2 of this invention. It is a cross-sectional schematic diagram of the electromagnetic actuator concerning Embodiment 3 of this invention. It is a cross-sectional schematic diagram of the electromagnetic actuator concerning Embodiment 4 of this invention. It is a cross-sectional schematic diagram of the movable iron core used for the electromagnetic actuator concerning Embodiment 5 of this invention. It is a side surface schematic diagram of the switchgear concerning Embodiment 6 of this invention. In the switchgear concerning Embodiment 6 of this invention, it is a side surface schematic diagram which shows the state which the fixed side electrode and movable side electrode of the vacuum interruption | blocking part separated.

Embodiment 1 FIG.
FIG. 1 is a schematic perspective view showing the appearance of an electromagnetic actuator according to Embodiment 1 of the present invention.
FIG. 2 is a schematic perspective view showing a state where the stator and the movable iron core are separated from each other in the electromagnetic actuator according to Embodiment 1 of the present invention.
FIG. 3 is a schematic diagram showing an AA cross section of the electromagnetic actuator shown in FIG. 1.
As shown in FIGS. 1 to 3, the electromagnetic actuator 100 according to the present embodiment includes a stator 1, a movable iron core 2 that is installed in a state in which reciprocal motion can be performed relative to the stator 1, and a movable And an output shaft 6 fixed to the iron core 2.

The stator 1 includes a fixed iron core 8, a coil 4 in which an electric wire is wound around a winding frame (referred to as a bobbin) 4 a, a support member 5 that supports the movable iron core 2, and a plate-like permanent that sucks the movable iron core 2. And a magnet 3.
The movable iron core 2 is formed of a plate-like portion 2 a that is opposed to the permanent magnet 3 and is attracted by the permanent magnet 3, and a columnar portion 2 b that is a portion supported by the support member 5.
The output shaft 6 penetrates substantially the center of the plate-like portion 2a and the columnar portion 2b, is fixed to the plate-like portion 2a and the columnar portion 2b, and extends to the columnar portion 2b side. Yes. That is, the plate-like portion 2a and the cylindrical portion 2b that form the movable iron core 2 and the output shaft 6 are integrated.

And the fixed iron core 8 is a laminated body formed by laminating steel plates, and the two side leg portions 8a and the yoke portion 8b for connecting one end side of each side leg portion 8a, Each side leg 8 has a substantially C-shape having a protruding portion 8 c protruding inward from the other end side. The yoke portion 8b is provided with an output shaft insertion hole.
The coil 4 is installed on the inner peripheral side of the substantially C-shaped fixed iron core 8, and the cylindrical portion 2 b of the movable iron core 2 is inserted into a hole portion (referred to as a bobbin hole) of the bobbin 4 a. Yes. The size of the bobbin hole is a size that allows the cylindrical portion 2b to be inserted smoothly.

The support member 5 is installed between the protrusions 8c of the fixed iron core 8, and a support hole 5a for supporting the movable iron core 2 in a state in which the movable iron core 2 can reciprocate is provided at the center thereof. The cylindrical portion 2b of the movable iron core 2 is inserted through 5a.
In addition, the plate-like permanent magnet 3 is attached to a portion facing the plate-like portion 2 a of the movable core 2, which is on the outer peripheral side of the protruding portion 8 c of the fixed iron core 8. The surface of the plate-like permanent magnet 3 is covered with a cover (not shown).

Further, the movable iron core 2 is a block-like magnetic body in which both the plate-like portion 2a and the columnar portion 2b are integrated, and may be integrated or may be joined together.
Further, the surface of the plate-like portion 2a facing the stator 1 has a substantially rectangular shape.
FIG. 4 is a diagram showing the relationship between the plate-shaped portion of the movable iron core and the permanent magnet when the movable iron core rotates in the electromagnetic actuator according to Embodiment 1 of the present invention.
As shown in FIG. 4, the electromagnetic actuator 100 according to the present embodiment is produced when used in an opening / closing device, and when the rotation angle about the axis of the output shaft 6 in the movable iron core 2 is up to 10 degrees, A movable iron core having a size capable of covering the attracting surface of the permanent magnet 3 with the surface facing the stator 1 of the plate-like portion 2a is used.

In the electromagnetic actuator 100 of the present embodiment, the movable iron core 2 is disposed on the stator 1 in a state where the columnar portion 2b is supported by being inserted through the support hole 5a and inserted into the bobbin hole. The shaft 6 is disposed in the stator 1 in a state where the shaft 6 is inserted through the output shaft insertion hole.
Further, the electromagnetic actuator 100 according to the present embodiment has a plate-like portion of the movable iron core 2 even if the movable iron core 2 is moved until the cylindrical portion 2b of the movable iron core 2 contacts the yoke portion 8b of the fixed iron core 8. A slight gap is formed between 2a and the permanent magnet 3.

In the present embodiment, the support member 5 is formed of a resin excellent in slidability and mechanical strength. Examples of the resin material used include fluorine resin, POM (polyacetal) resin, PA (polyamide) resin, PBT (polybutylene terephthalate) resin, and polyester resin. The resin material is preferable because the support member 5 can be formed by a molding process, so that the manufacturing cost can be reduced.
In the present embodiment, the coil 4 uses a bobbin 4 a that winds an electric wire. The bobbin 4a may be formed of a resin material and integrally formed with the support member 5. In this case, the number of parts can be reduced, and the part cost and assembly cost can be reduced.

In the electromagnetic actuator 100 of the present embodiment, the fixed iron core 8 occupying most of the magnetic circuit of the electromagnetic actuator is formed of a laminate of steel plates, and eddy currents are suppressed, so that the operation efficiency is high and the coil is large. The stator can attract the movable iron core without passing an electric current, and the operating power supply can be downsized.
Further, the electromagnetic actuator 100 according to the present embodiment has a surface facing the stator 1 of the plate-like portion 2a of the movable core 2 even if the movable core 2 is rotationally displaced within a range generated when used in the switchgear. Since the attraction surface of the permanent magnet 3 is covered, the leakage magnetic flux when the stator attracts the movable iron core can be minimized, and the stator exhibits a stable attraction force.

  In the electromagnetic actuator 100 of the present embodiment, the plate-like portion of the movable iron core 2 is moved even if the movable iron core 2 moves until the cylindrical portion 2b of the movable iron core 2 contacts the yoke portion 8b of the fixed iron core 8. 2a and the permanent magnet 3 are formed with a slight gap, so that even when the movable iron core is attracted by the stator, the plate-like portion of the movable iron core can be prevented from colliding with the permanent magnet, Magnet breakage can be avoided.

  In addition, the conventional electromagnetic actuator has a structure in which an output shaft with a small diameter is supported by a bearing. Therefore, when the output shaft is tilted due to the influence of the operation target device and the axis is displaced, the movable iron core and the stator are movable. The sliding friction resistance when the core is inserted, for example, when the movable core is in contact with the inner wall of the coil bobbin provided on the stator or the movable core is in contact with the movable core is driven. There was a possibility that the contact area would increase or wear.

However, the electromagnetic actuator 100 according to the present embodiment supports the cylindrical portion 2b of the movable iron core 2, that is, the movable iron core itself, by the support hole 5a of the support member 5 provided in the stator 1. The accuracy can be increased, and the movable iron core can move smoothly.
In addition, alignment work for aligning the axis of the movable iron core and the output shaft is not necessary, and assembling becomes easy and the assembling cost can be reduced.

Further, in the electromagnetic actuator 100 of the present embodiment, since the stationary iron core 8 of the stator 1 is formed by laminating substantially C-shaped steel plates, the production of the stationary iron core is easy and the production cost is reduced. it can.
Moreover, since the movable iron core 2 can form the plate-shaped part 2a and the columnar part 2b as one body, manufacturing cost can be reduced. Even if the plate-like part 2a and the columnar part 2b of the movable iron core 2 are separate, the plate-like part 2a and the columnar part 2b are coupled by the output shaft, so that the production of the movable iron core is easy. Manufacturing cost can be reduced.

In the electromagnetic actuator 100 of the present embodiment, the plate-like portion 2a of the movable iron core 2 is a massive magnetic body, but may be a separate body from the cylindrical portion 2b and may be a laminate of steel plates. The eddy current is further suppressed. The laminated steel plates are integrated by, for example, caulking or bolt / nut fastening.
Moreover, although the surface facing the permanent magnet 3 of the plate-shaped part 2a in the movable iron core 2 is a substantially rectangular shape, if the attraction surface of the permanent magnet 3 can be covered, it will not be limited to this shape. For example, if it is a disk shape, the influence of rotational displacement can be eliminated.
A resin molded product is used for the support member 5, but general bearing parts (such as ball bearings, oil-immersed metals, and oil-free bushes) may be used.

Embodiment 2. FIG.
FIG. 5 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 2 of the present invention.
As shown in FIG. 5, the electromagnetic actuator 200 according to the present embodiment is formed by stacking steel plates in which the columnar portion 22 b of the movable iron core 22 is separate from the plate-like portion 22 a and has an insertion hole for the output shaft 6. The electromagnetic actuator 100 is the same as that of the electromagnetic actuator 100 of the first embodiment except that the laminated body is formed.
The laminated body forming the columnar part 22b is firmly fixed by the output shaft 6 and the nut 6a inserted through the columnar part 22b. Moreover, it is possible to fix the laminated steel plates more firmly by providing dowels between the steel plates of the laminate or press-fitting pins into the laminate.

  The electromagnetic actuator 200 according to the present embodiment has the same effect as the electromagnetic actuator 100 according to the first embodiment, and the movable iron core 22 is a laminated body formed by laminating disc-shaped steel plates. Since the eddy current can be further suppressed, the operation efficiency can be further improved and the operation power source can be reduced in size.

Embodiment 3 FIG.
FIG. 6 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 3 of the present invention.
FIG. 6 shows a state where the stator 31 and the movable iron core 32 are separated.
As shown in FIG. 6, the electromagnetic actuator 300 according to the present embodiment has a cylindrical steel plate laminate divided into two on the lamination surface, and one steel plate laminate is used as a cylindrical portion 32 b of the movable iron core 32. The steel plate laminate 32d is disposed on the inner peripheral side of the yoke portion 8b of the fixed iron core 8, and the columnar portion 32b of the movable iron core 32 is in contact with the steel plate laminate 32d arranged on the yoke portion 8b of the fixed iron core 8. Even when the movable iron core 32 is moved, the electromagnetic actuator 200 of the second embodiment is the same as that of the second embodiment except that a slight gap is formed between the plate-like portion 32a of the movable iron core 32 and the permanent magnet 3. .

  The electromagnetic actuator 300 according to the present embodiment has the same effect as that of the electromagnetic actuator 200 according to the second embodiment, and one laminated body in the laminated body of two divided steel plates is formed as a cylindrical portion 32b, and the movable iron core Since the mass of 32 is reduced, the reciprocating motion of the movable iron core can be speeded up.

Embodiment 4 FIG.
FIG. 7 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 4 of the present invention.
As shown in FIG. 7, the electromagnetic actuator 400 according to the present embodiment is disposed on one inner side of the steel plate laminate that is the cylindrical portion 42 b of the movable iron core 42 and the yoke portion 8 b of the fixed iron core 8. A spring 42e is provided between the other steel plate laminate 42d, and the total thickness of one steel plate laminate and the other steel plate laminate 42d is reduced by the width of the spring 42e. Even if the spring 42e is compressed until it balances the force that attracts the movable iron core 42 of the 41, the implementation is performed except that a slight gap is formed between the plate-like portion 42a of the movable iron core 42 and the permanent magnet 3. This is the same as the electromagnetic actuator 300 of the third embodiment.

  The electromagnetic actuator 400 of the present embodiment has the same effect as the electromagnetic actuator 300 of the third embodiment, and a spring 42e is provided between the cylindrical portion 42b of the movable iron core and the other steel plate laminate 42d. Since the load acts on the spring 42e in the direction in which the cylindrical portion 42b and the other steel plate laminate 42d are separated from each other, the step of fixing the other steel plate laminate 42d to the yoke portion 8b of the fixed iron core 8 is performed. This is unnecessary and can reduce the manufacturing cost.

Embodiment 5 FIG.
FIG. 8 is a schematic sectional view of a movable iron core used in an electromagnetic actuator according to Embodiment 5 of the present invention.
The electromagnetic actuator according to the present embodiment is the same as the electromagnetic actuator 100 according to the first embodiment except that the movable iron core 52 in which the plate-like portion stopper 2c is provided on the plate-like portion 2a shown in FIG. 8 is used.
The plate-like portion stopper 2c is provided at four corners of the surface of the plate-like portion 2a facing the stator 1, and when the movable iron core 52 is sucked by the stator 1, the fixed iron core 8 is fixed. It comes into contact with the protruding portion 8c.

The electromagnetic actuator according to the present embodiment has the same effect as the electromagnetic actuator 100 according to the first embodiment, and the plate-like portion stopper 2c is provided on the plate-like portion 2a of the movable iron core 52. Even if the movable iron core 52 is temporarily inclined due to the cause, the plate-like portion stopper 2c comes into contact with the fixed iron core 8, so that the collision between the movable iron core 52 and the permanent magnet 3 can be avoided and the permanent magnet 3 is prevented from being damaged. it can.
In particular, when the plate-like portion 2a of the movable iron core 52 is formed of a laminate of steel plates, a bolt may be used for fastening the laminate, and this fastening bolt may be used as the plate-like portion stopper 2c, thereby reducing the manufacturing cost.
The plate-like portion stopper of the present embodiment can be applied to any electromagnetic actuator of the second to fourth embodiments, and the same effect can be obtained.

Embodiment 6 FIG.
FIG. 9 is a schematic side view of a switchgear according to Embodiment 6 of the present invention.
FIG. 9 shows a state in which the side portion of the switchgear 600 is removed so that the structure of the switchgear 600 of the present embodiment can be understood.
As shown in FIG. 9, the opening / closing device 600 according to the present embodiment transmits the operation of the electromagnetic actuator 100 according to the first embodiment, the vacuum interrupting unit 610 that is an opening / closing unit, and the electromagnetic actuator 100 to the vacuum interrupting unit 610. A vacuum circuit breaker including a lever 630 serving as a transmission mechanism.

The vacuum interrupter 610 includes an insulator 611, a vacuum valve 612, an upper conductor 613, and a lower conductor 614 that are fixed to the insulator 611 and form a main circuit.
In the vacuum valve 612, a fixed side electrode 615 and a movable side electrode 616 are disposed so as to be able to contact and separate.
One end of a fixed side electrode conductor 615a is connected to the fixed side electrode 615, and an upper conductor 613 is electrically connected to the other end of the fixed side electrode conductor 615a.
One end of a movable side electrode conductor 616a is connected to the movable side electrode 616. The movable side electrode conductor 616a passes through the bellows 617 and is led out of the vacuum valve 612. The lower conductor 614 is electrically connected through the conductor 618.

The lead-out portion of the movable electrode conductor 616a is mechanically connected to one end of the lever 630 from the upper surface side via a contact pressure spring 632.
The lever 630 connected to the lead-out portion of the movable electrode conductor 616a is formed of an insulating material such as a resin material in order to electrically insulate the main circuit of the vacuum interrupter 610 from the electromagnetic actuator 100. In the case where the lever 630 is made of a non-insulating material such as metal, an insulating portion (not shown) is provided between the connecting portion of the flexible conductor 618 and the connecting portion of the lever 630 in the lead-out portion of the movable electrode conductor 616a.

In addition, the lever 630 supports the rotating shaft 631 at the center of rotation in a state where it can be rotated by a bearing or the like, and the output shaft 6 of the electromagnetic actuator 100 is connected to the other end of the lever 630 from the upper surface side. Yes.
An opening spring 633 is provided on the opposite side of the surface of the lever 630 where the output shaft 6 is connected.

Next, the operation of the opening / closing device 600 of the present embodiment will be described.
FIG. 9 shows a state where the fixed-side electrode 615 and the movable-side electrode 616 of the vacuum interrupter 610 are in contact with each other.
FIG. 10 is a schematic side view showing a state where the fixed side electrode and the movable side electrode of the vacuum interrupter are separated in the switchgear according to Embodiment 6 of the present invention.

In a state where the fixed side electrode 615 and the movable side electrode 616 of the vacuum interrupter 610 are in contact with each other as shown in FIG. 9, the movable core 2 of the electromagnetic actuator 100 is in a state of being held by suction on the stator 1.
That is, the plate-like permanent magnet 3 is magnetized in the plate thickness direction, and the magnetic flux generated from the permanent magnet 3 passes from the bottom surface of the cylindrical portion 2 b of the movable iron core 2 to the fixed iron core 8 as the movable iron core 2. A flowing low reluctance magnetic circuit is formed to increase the amount of magnetic flux, and the movable iron core 2 is attracted and held by the stator 1.
At this time, the contact pressure spring 632 and the release spring 633 are in a compressed state.

Next, in the switchgear 600 in the state shown in FIG. 9, a current is passed through the coil 4 of the electromagnetic actuator 100 so that the magnetic flux formed by the coil 4 is opposite to the magnetic flux of the permanent magnet 3.
Then, since the magnetic flux generated by the coil current weakens the magnetic flux generated by the permanent magnet 3, the force for attracting the movable iron core 2 of the permanent magnet 3 is reduced. When the attractive force of the permanent magnet 3 becomes smaller than the compressive load of the contact pressure spring 632 and the release spring 633, the energy stored in each spring is released, and the lever 630 rotates in the clockwise direction around the rotation center 631. Then, the movable side electrode 616 moves downward, and the fixed side electrode 615 and the movable side electrode 616 are separated.
Thereafter, the distance between the fixed side electrode 615 and the movable side electrode 616 is increased until it is stopped by a stopper (not shown), resulting in a state as shown in FIG.

As shown in FIG. 10, in the state where the fixed side electrode 615 and the movable side electrode 616 are separated until stopped by the stopper, the distance (magnetic gap) between the movable core 2 and the stator 1 is large and permanent. The attractive force by the magnet 3 is rapidly reduced.
In this state, even if the current flowing through the coil 4 is stopped, the state where the fixed side electrode 615 and the movable side electrode 616 are separated by the force of the opening spring 633 acting in the opening direction of the movable side electrode 616 is maintained. .
The power source for supplying current to the coil 4 may be a DC power source or a capacitor charge / discharge circuit.

Next, in the switchgear 600 in the state shown in FIG. 10, a current is passed through the coil 4 so that the magnetic flux formed by the coil 4 is in the same direction as the magnetic flux of the permanent magnet 3.
Then, an electromagnetic attraction force acts on the movable iron core 2 from the stator 1, the stator 1 attracts the movable iron core 2, and the output shaft 6 connected to the movable iron core 2 rotates the lever 630 counterclockwise. When the lever 630 rotates counterclockwise, the movable side electrode conductor 616a is pushed up, the movable side electrode 616 approaches the fixed side electrode 615, and finally, the movable side electrode 616 and the fixed side electrode 615 come into contact with each other. As shown in FIG.

As shown in FIG. 9, in the electromagnetic actuator 100, when the movable iron core 2 is attracted and held by the stator 1, the movable iron core 2 is fixed by the magnetic flux generated by the permanent magnet 3 even if the current flowing to the coil 4 is stopped. 1, the contact state (entered state) between the fixed-side electrode 615 and the movable-side electrode 616 of the vacuum shut-off unit 610 is maintained.
Further, the number of turns of the coil 4 and the current flowing through the coil 4 in the electromagnetic actuator 100 are set so that an electromagnetic attractive force exceeding the spring load of the contact pressure spring 632 and the open spring 633 is generated.

The switchgear 600 according to the present embodiment uses the electromagnetic actuator 100 according to the first embodiment. The operation efficiency is high, the power source used can be reduced in size, and the operation of the movable iron core is smooth. The contact and separation between the electrode 615 and the movable electrode 616 can be performed smoothly.
Further, in the opening / closing apparatus 600 of the present embodiment, the output shaft 6 and the lever 630 are normally connected by a pin, and there is play caused by the clearance between the pin diameter and the hole diameter of the connecting portion. Therefore, there is a possibility that the movable iron core 2 is slightly displaced (less than 10 degrees) around the output shaft 6.

  The electromagnetic actuator 100 of the first embodiment used in the opening / closing device 600 of the present embodiment is such that the surface of the plate-like portion 2a facing the permanent magnet 3 has a rotation angle even when the movable iron core 2 rotates. If it is 10 degrees or less, the permanent magnet 3 has a size that can cover the attraction surface. Therefore, the leakage magnetic flux at the time of attraction can be minimized, and a stable attraction force is expressed. Contact and separation with the movable electrode 616 can be realized.

The switchgear 600 according to the present embodiment can use any of the electromagnetic actuators according to the second to fifth embodiments, and has the same effect as when the electromagnetic actuator according to the first embodiment is used.
Particularly, in the case of using the electromagnetic actuator of the third embodiment, the movable core of the electromagnetic actuator is reduced in weight, and the reciprocating operation thereof is speeded up. The spring load of the pressure spring and the open spring can be reduced.

In the electromagnetic actuator according to the fourth embodiment, a spring is provided between the cylindrical part of the movable iron core and the laminated body installed in the yoke part of the fixed iron core in the electromagnetic actuator. Since the spring acts in the same direction as the open spring, the open spring can be reduced in size.
The switchgear according to the present embodiment is a vacuum circuit breaker, but may be a gas circuit breaker, a circuit breaker including a fixed electrode and a movable electrode in the atmosphere, or a switch.

  The switchgear according to the present embodiment transmits the operation of the electromagnetic actuator to the vacuum shut-off unit via the lever, and makes contact and separation between the fixed side electrode and the movable side electrode. May be arranged on a straight line, and the output shaft of the electromagnetic actuator may be connected to the movable side electrode of the vacuum interrupter. In this case, the output shaft and the movable side electrode are electrically insulated.

  In the electromagnetic actuator according to the present invention, the movable iron core includes a plate-like portion and a cylindrical portion, the stator includes a laminated fixed iron core, a coil, a permanent magnet, and a support member, and the cylindrical portion of the movable iron core. Is held by the support member of the stator, the manufacturing cost is low, and stable operation of the movable iron core can be realized. Therefore, low cost is required and the switchgear is excellent in reliability.

1 Stator, 2 Movable iron core, 2a Plate-shaped part, 2b Cylindrical part,
2c Stopper for plate-like part, 3 permanent magnet, 4 coil, 4a bobbin, 5 support member,
5a support hole, 6 output shaft, 6a nut, 8 fixed iron core, 8a side leg,
8b yoke part, 8c protruding part, 22 movable iron core, 22a plate-like part, 22b columnar part,
31 Stator, 32 Movable iron core, 32a Plate-shaped part, 32b Columnar part,
32d Steel plate laminate, 41 Stator, 42 Movable iron core, 42a Plate-shaped part,
42b cylindrical part, 42d steel plate laminated body, 42e spring, 52 movable iron core,
100, 200, 300, 400 electromagnetic actuator, 600 switchgear,
610 vacuum shut-off unit, 611 insulator, 612 vacuum valve, 613 upper conductor,
614 Lower conductor, 615 Fixed side electrode, 615a Fixed side electrode conductor,
616 movable electrode, 616a movable electrode conductor, 617 bellows,
618 Flexible conductor, 630 lever, 631 rotating shaft, 632 contact pressure spring,
633 Open spring.

Claims (10)

An electromagnetic actuator comprising a stator, a movable iron core installed in a state where it can reciprocate relative to the stator, and an output shaft fixed to the movable iron core,
The stator is a laminated body formed by laminating steel plates, and has two side legs, a yoke part connecting one end of each side leg, and each side leg. A fixed iron core having a substantially C-shape with a protruding portion protruding inward from the other end of the coil, a coil installed on the inner peripheral side of the fixed iron core, and a support hole provided between the protruding portions. The support member and the permanent magnet installed on the outer peripheral side of the protrusion,
The movable iron core is formed of a plate-like part and a cylindrical part of a magnetic body, and the output shaft extends to the cylindrical part side,
An electromagnetic actuator in which the plate-shaped portion is opposed to the permanent magnet, the columnar portion is supported by a support hole of the support member, and the movable iron core is disposed on the stator. The electromagnetic actuator according to claim 1, wherein the columnar portion of the movable iron core is a laminated body formed by laminating steel plates. The columnar portion of the movable iron core is formed by one steel plate laminate obtained by dividing the laminate of steel plates by two on the lamination surface, and the other steel plate laminate obtained by dividing the laminate of the steel plates by two on the lamination surface is the stator core. The electromagnetic actuator according to claim 2, wherein the electromagnetic actuator is disposed on an inner peripheral side of the yoke portion. The electromagnetic actuator according to claim 3, wherein a spring is provided between the one steel plate laminate and the other steel plate laminate. The surface of the plate-like portion of the movable iron core facing the stator is sized to cover the permanent magnet even when the movable iron core is rotationally displaced about the axis in the output shaft direction. The electromagnetic actuator according to any one of claims 1 to 4. The electromagnetic actuator according to any one of claims 1 to 5, wherein a plate-like portion stopper is provided on a surface of the plate-like portion of the movable iron core facing the stator.   The electromagnetic actuator according to claim 1, wherein the support member is made of a resin material. The electromagnetic actuator according to claim 7, wherein the coil is formed by winding an electric wire around a bobbin, and the bobbin and the support member are formed by integral molding of a resin material. An opening / closing part having a fixed side electrode, a movable side electrode, a fixed side electrode conductor having one end connected to the fixed side electrode, and a movable side electrode conductor having one end connected to the movable side electrode; 9. An opening / closing device comprising: the electromagnetic actuator according to claim 8; and a transmission mechanism that transmits a reciprocating motion of a movable iron core of the electromagnetic actuator to a movable electrode conductor of the opening / closing portion. The above transmission mechanism is mechanically connected to the movable electrode conductor from the upper surface side through a contact pressure spring at one end, and mechanically connected to the output shaft from the upper surface side to the other end, and can be rotated around a central axis. The opening / closing apparatus according to claim 9, wherein an opening spring is provided on an opposite side of an output shaft coupling surface of the lever.

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