JP2009049231A - Electromagnet device and solenoid-operated switch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnet device which can more definitely suppress degradation of magnetism of a permanent magnet and can be minituarized, and to provide a solenoid-operated switch device. <P>SOLUTION: In an electromagnet device 10, a movable iron core 20 is displaced along the axial direction of the solenoid-operated switch device. On the base part 23 and the stationary iron core 19 of the movable iron core 20, the first movable part 34 and the first stationary surface 32 facing to the axial direction are respectively provided. On the branch part 24 and the stationary iron core 19 of the movable iron core 20, the second movable surface 35 and the second stationary surface 33 facing to the axial direction are respectively provided. On the base part 23, only one of either N pole or S pole of the permanent magnet 22, installed on the fixed iron core 19, faces the vertical direction to the axial direction. Consequently, the magnetic flux for the release can be generated while avoiding the permanent magnet 22 when the movable iron core 20 is released from holding. Also, sizes such as of the space between the permanent magnet 22 and the movable iron core 20 can be set small. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electromagnet device that displaces a movable iron core relative to a fixed iron core by energization of an electromagnetic coil, and an electromagnetically operated opening / closing device that opens and closes a contact by a driving force of the electromagnet device.

  Conventionally, an electromagnet device is sometimes used to open and close a contact of a switching device. In the electromagnet device, the movable iron core can be displaced with respect to the fixed iron core. The contact opens when the movable core moves away from the fixed core, and closes when the movable core approaches the fixed core.

  The movable iron core is composed of a plunger and a disk-shaped steel plate fixed to the end of the plunger in the displacement direction of the movable iron core. The fixed iron core is a steel pipe in which the plunger is inserted, a convex steel material that is attached in the steel pipe and faces the end of the plunger in the displacement direction of the movable iron core, and is attached in the steel pipe. It is comprised with the ring-shaped steel materials which a surface opposes.

  A permanent magnet that generates a magnetic flux for holding the contact closed is fixed to the ring-shaped steel material. The permanent magnet is arranged so that only one of the N pole and the S pole faces the disk-shaped steel plate in the displacement direction of the movable iron core. That is, in the part where the permanent magnet faces the disk-shaped steel plate, the direction of the magnetic flux of the permanent magnet is substantially the same as the direction of displacement of the movable iron core.

  An annular coil with a plunger inserted inside is provided in the fixed iron core. The coil is disposed between the convex steel material and the ring-shaped steel material. In addition, the coil generates a magnetic flux that opposes the magnetic flux of the permanent magnet in order to release the attracting and holding of the movable core with the contact closed, and the same as the magnetic flux of the permanent magnet to close the contact from the contact open state. Directional magnetic flux is generated (see, for example, Patent Document 1).

JP 2006-222438 A

  The distance between the disk-shaped steel plate when the movable iron core is attracted and held and the ring-shaped steel material provided with the permanent magnet is narrower than the gap between the inner peripheral surface of the ring-shaped steel material and the side surface of the plunger. In this case, since the magnetic flux of the coil passes through the permanent magnet, the permanent magnet is demagnetized.

  Therefore, in order to suppress the progress of demagnetization of the permanent magnet, in the above-described conventional electromagnet device, the distance between the disk-shaped steel plate and the ring-shaped steel material when the movable iron core is attracted and held is determined by the ring-shaped steel material. It is made wider than the clearance gap between the inner peripheral surface and the side surface of the plunger.

  However, the gap between the disk-shaped steel plate and the permanent magnet decreases due to wear of the movable iron core due to the use of the electromagnet device. It is necessary to widen the gap. Further, when the gap between the permanent magnet and the disk-shaped steel plate is widened, the interval between the ring-shaped steel material and the disk-shaped steel plate is also widened, so that it is necessary to enlarge the permanent magnet in order to secure an attractive force. Therefore, it becomes difficult to reduce the size of the electromagnet device.

  The present invention has been made in order to solve the above-mentioned problems, and can suppress the progress of demagnetization of the permanent magnet more reliably and can reduce the size of the electromagnet device. And an electromagnetically operated switchgear.

  The electromagnet device according to the present invention includes a fixed iron core provided with a first fixing surface and a second fixing surface so as to be spaced apart from each other when projected in the axial direction, and a first facing the first fixing surface in the axial direction. A retraction position separated from the fixed iron core, having a main portion provided with one movable surface and a branch portion provided on the main portion and provided with a second movable surface facing the second fixed surface in the axial direction; A movable iron core that is displaceable in the axial direction between the advanced position closer to the fixed iron core than the retracted position, and a pair of magnetic poles, provided on the fixed iron core, and any of the pair of magnetic poles in a direction perpendicular to the axial direction A permanent magnet disposed only outside each region of the first movable surface and the second movable surface in the axial projection plane while facing the movable iron core, and an electromagnetic coil provided on the fixed iron core, The permanent magnet is in front of the movable iron core A magnetic flux for holding at a position is generated, and the electromagnetic coil generates a magnetic flux in a direction opposite to the magnetic flux for holding between the first movable surface and the first fixed surface, thereby holding the movable iron core at the forward position. The movable iron core is displaced from the retracted position to the advanced position by releasing and generating a magnetic flux in the same direction as the holding magnetic flux between the first movable surface and the first fixed surface.

  In the electromagnet device according to the present invention, the movable iron core is displaced in the axial direction, and the first movable surface provided in the core portion of the movable iron core and the first fixed surface provided in the fixed iron core are opposed in the axial direction. And the 2nd movable surface provided in the branch part of the movable iron core and the 2nd fixed surface provided in the fixed iron core are opposed in the direction of an axis, and the N pole and S of the permanent magnet provided in the fixed iron core Since only one of the poles faces the backbone in the direction perpendicular to the axial direction, when releasing the movable core from the forward position, avoid the permanent magnet and generate the release magnetic flux. Can do. Thereby, progress of the demagnetization of a permanent magnet can be suppressed. Further, the dimension between the permanent magnet and the movable iron core does not change greatly due to the displacement of the movable iron core in the axial direction. That is, even when the moving position or the moving position of the movable iron core is shifted due to wear of the movable iron core or the like, the gap size between the permanent magnet and the movable iron core does not change. For this reason, the gap dimension between the permanent magnet and the movable core and the thickness dimension of the permanent magnet can be set small without considering the wear of the movable core. Therefore, it is possible to reduce the size of the electromagnet device.

Embodiment 1 FIG.
1 is a longitudinal sectional view showing an electromagnetically operated switchgear according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing a state where the contacts of the electromagnetically operated switchgear shown in FIG. 1 are closed (closed state). In addition, FIG. 1 is a figure which shows the state (open state) in which the contact of an electromagnetically operated switchgear is open. In the figure, an electromagnetically operated switchgear 1 contacts and separates a fixed contact 2, a movable contact 3 that can be brought into and out of contact with the fixed contact 2, a vacuum valve 4 that houses the fixed contact 2 and the movable contact 3, and a fixed contact 2. A driving device 5 that displaces the movable contact 3 in the direction, and a connecting device 6 that connects the driving device 5 and the movable contact 3 are provided.

  The movable contact 3 contacts and separates from the fixed contact 2 due to displacement in the axial direction of the electromagnetically operated switching device 1 (hereinafter simply referred to as “axial direction”). The contacts of the electromagnetic operation switching device 1 are closed when the movable contact 3 comes into contact with the fixed contact 2 and are opened when the movable contact 3 is separated from the fixed contact 2.

  The inside of the vacuum valve 4 is kept in a vacuum in order to improve the arc extinguishing ability between the fixed contact 2 and the movable contact 3. The movable contact 3 is brought into and out of contact with the fixed contact 2 within the vacuum valve 4.

  The driving device 5 is supported by a plate-like support member 7. In this example, the support member 7 is a support plate of a switchboard. The drive device 5 includes a drive shaft 8 coupled to the movable contact 3 via the coupling device 6 and an open spring (biasing body) that biases the drive shaft 8 in a direction in which the movable contact 3 moves away from the fixed contact 2. 9 and an electromagnet device 10 that displaces the drive shaft 8 in the direction in which the movable contact 3 contacts the fixed contact 2 against the urging force of the opening spring 9.

  The drive shaft 8 penetrates the support member 7 so as to be displaceable in the axial direction. The drive shaft 8 is made of a material having a low magnetic permeability (low magnetic material) (for example, stainless steel). The drive shaft 8 is provided with an open spring receiver 11 that receives the biasing force of the open spring 9.

  The opening spring 9 is contracted between the support member 7 and the opening spring receiver 11. Thereby, the open spring 9 generates an elastic repulsion force in the axial direction between the support member 7 and the open spring receiver 11. The drive shaft 8 is biased in a direction in which the movable contact 3 is separated from the fixed contact 2 by the elastic repulsive force of the opening spring 9. The open spring 9 is provided between the electromagnet device 10 and the coupling device 6.

  The electromagnet device 10 is attached to the support member 7 via the attachment member 12. The drive shaft 8 is controlled by the electromagnet device 10 being controlled in either the direction in which the movable contact 3 contacts the fixed contact 2 (closed direction) or the direction in which the movable contact 3 moves away from the fixed contact 2 (opening direction). Is selectively displaced.

  The connecting device 6 includes a movable rod 13 fixed to the movable contact 3, an insulating rod 14 provided at an intermediate portion of the movable rod 13, and a pressure contact device 15 attached between the movable rod 13 and the drive shaft 8. Have. The driving device 5 is insulated from the movable contact 3 by an insulating rod 14.

  The movable bar 13 is disposed along the axial direction. The movable rod 13 passes through the vacuum valve 4.

  The contact pressure device 15 includes a spring frame 16 fixed to the movable rod 13, a locking plate 17 fixed to the tip of the drive shaft 8 and disposed in the spring frame 16, a spring frame 16 and a locking plate 17. And a contact pressure spring 18 connected in a contracted manner.

  The drive shaft 8 can be displaced in the axial direction with respect to the spring frame 16 together with the stopper plate 17. The contact pressure spring 18 biases the drive shaft 8 in a direction away from the movable rod 13. The displacement of the drive shaft 8 in the direction away from the movable rod 13 is regulated by the engagement of the stopper plate 17 with the spring frame 16.

  When the movable contact 3 is separated from the fixed contact 2 (FIG. 1), when the drive shaft 8 is displaced in the axial direction, the coupling device 6 and the movable contact 3 are displaced together with the drive shaft 8. At this time, the stopper plate 17 is engaged with the spring frame 16 by the biasing force of the contact pressure spring 18. When the movable contact 3 is in contact with the fixed contact 2 (FIG. 2), the drive shaft 8 can be further displaced in the closing direction with respect to the spring frame 16 against the urging force of the contact pressure spring 18. It has become. Thereby, the contact pressure spring 18 is further contracted, and the movable contact 3 is pressed against the fixed contact 2 by the elastic repulsive force of the contact pressure spring 18.

  When the closing operation is performed from the state where the movable contact 3 is away from the fixed contact 2, the drive shaft 8 is displaced together with the coupling device 6 and the movable contact 3 in the closing direction while the release spring 9 is contracted. Thereafter, when the movable contact 3 comes into contact with the fixed contact 2, the displacement of the coupling device 6 and the movable contact 3 is stopped. Thereafter, the drive shaft 8 is further displaced in the closing direction, and the contact pressure spring 18 is contracted. As a result, the movable contact 3 is pressed against the fixed contact 2.

  When the opening operation is performed from the state in which the movable contact 3 is in contact with the fixed contact 2, the drive shaft 8 is displaced in the opening direction while the opening spring 9 and the contact pressure spring 18 are elastically restored. As a result, the retaining plate 17 is displaced with respect to the spring frame 16 and engaged with the spring frame 16. Thereafter, the drive shaft 8 is further displaced in the opening direction by the urging force of the opening spring 9. As a result, the movable contact 3 is separated from the fixed contact 2.

  3 is a cross-sectional view showing the electromagnet device 10 of FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 5 is a cross-sectional view showing the electromagnet device 10 of FIG. 2, and FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 7 is a perspective view showing the electromagnet device 10 shown in FIG. 3, FIG. 8 is a front view showing the electromagnet device 10 shown in FIG. 7, FIG. 9 is a side view showing the electromagnet device 10 shown in FIG. 1 is a top view showing an electromagnet device 10. FIG. In the figure, an electromagnet device 10 is provided on a fixed iron core 19, a drive shaft 8 fixed, a movable iron core 20 that can be displaced in the axial direction with respect to the fixed iron core 19, and the fixed iron core 19, and generates a magnetic field by energization. It has an electromagnetic coil 21 and a permanent magnet 22 provided on the fixed iron core 19.

  The movable core 20 is displaceable between a retracted position (FIGS. 5 and 6) away from the fixed iron core 19 and an advanced position (FIGS. 3 and 4) closer to the fixed iron core 19 than the retracted position. . The movable contact 3 is separated from the fixed contact 2 when the movable iron core 20 is in the retracted position, and is pressed against the fixed contact 2 when the movable iron core 20 is in the advanced position.

  The movable iron core 20 has a trunk portion 23 disposed along the axial direction, and a pair of branch portions 24 projecting in opposite directions from the side surfaces of the trunk portion 23. Each branch portion 24 protrudes from the trunk portion 23 along a direction perpendicular to the axial direction. A fixing member 25 provided with a screw hole is fitted in the trunk portion 23. The drive shaft 8 is fixed to the movable iron core 20 by being screwed to the fixing member 25.

  The fixed iron core 19 has a first fixed iron core portion 26 and a pair of second fixed iron core portions 27 provided on the first fixed iron core portion 26 and arranged so as to avoid a region where the movable iron core 20 is displaced. (FIG. 7).

  The first fixed iron core portion 26 has a horizontal iron core portion 28 arranged in parallel with each branch portion 24, and a pair of vertical iron core portions 29 extending from both ends of the horizontal iron core portion 28 toward each branch portion 24. ing. The drive shaft 8 passes through the horizontal iron core portion 28 so as to be displaceable in the axial direction. In this example, a bearing is provided in the horizontal iron core portion 28, and the drive shaft 8 passes through the bearing. A bearing may be provided on the support member 7 and the drive shaft 8 may penetrate the bearing. Each vertical iron core part 29 is arrange | positioned along the axial direction. At least a part of the first fixed iron core portion 26 overlaps the region of the movable iron core 20 in the projection plane in the axial direction.

  Each second fixed iron core portion 27 is joined between one vertical iron core portion 29 and the other vertical iron core portion 29. Moreover, each 2nd fixed iron core part 27 has pinched | interposed each vertical iron core part 29 about the direction perpendicular | vertical to an axial direction. Furthermore, each 2nd fixed iron core part 27 is arrange | positioned outside the area | region of the movable iron core 20 in the projection surface to an axial direction. Furthermore, each second fixed core part 27 has a transfer core part 30 parallel to the horizontal core part 28 and a pair of spacers 31 interposed between the transfer core part 30 and each vertical core part 29, respectively. ing.

  Each passing iron core part 30 is arranged away from the main part 23 in a direction perpendicular to the axial direction. Accordingly, the distance between the transfer iron core 30 and the core 23 does not change even when the movable iron core 20 is displaced in the axial direction. The material of each core part 30 and spacer 31 is a magnetic material (for example, steel, electromagnetic soft iron, silicon steel, ferrite, permalloy, etc.).

  A first fixing surface 32 is provided at an intermediate portion of the horizontal core portion 28, and a second fixing surface 33 is provided at the distal end portion of each vertical core portion 29 (FIGS. 3 to 6). That is, the first fixed iron core portion 26 is provided with the first fixed surface 32 and the second fixed surface 33 so as to be positioned away from each other when projected in the axial direction. The first fixed surface 32 and each second fixed surface 33 are surfaces perpendicular to the axial direction.

  The trunk portion 23 is provided with a first movable surface 34 that opposes the first fixed surface 32 in the axial direction, and a second movable portion that opposes the second fixed surface 33 in the axial direction at the distal end portion of each branch portion 24. A surface 35 is provided. The first movable surface 34 and each second movable surface 35 are surfaces perpendicular to the axial direction.

  In the axial projection surface, the area of the portion where the first fixed surface 32 and the first movable surface 34 overlap each other is larger than the area of the portion where the second fixed surface 33 and the second movable surface 35 overlap each other. It has become. In addition, the clearance dimension between the transfer iron core 30 and the core portion 23 is such that the gap between the first fixed surface 32 and the first movable surface 34 and the second fixed surface 33 and the second fixed surface 33 when the movable iron core 20 is in the advanced position. 2 It becomes wider than the total dimension of the gap with the movable surface 35.

  The permanent magnet 22 is provided in each of the transfer iron core portions 30. Further, the permanent magnets 22 are respectively disposed between the transfer iron core portions 30 and the backbone portion 23. Further, each permanent magnet 22 is disposed outside each region of the first movable surface 34 and the second movable surface 35 within the projection plane in the axial direction. In this example, each permanent magnet 22 is disposed outside the area of the movable iron core 20 in the projection plane in the axial direction.

  Each permanent magnet 22 has an N pole and an S pole (a pair of magnetic poles). As a result, the permanent magnet 22 generates a holding magnetic flux that holds the movable iron core 20 in the forward position. In addition, each permanent magnet 22 is arranged with only one of the N pole and the S pole facing the trunk portion 23 in the direction perpendicular to the axial direction. That is, the direction of the holding magnetic flux generated by each permanent magnet 22 is substantially perpendicular to the axial direction between the permanent magnet 22 and the trunk portion 23. In this example, the N pole of each permanent magnet 22 faces the backbone 23, and the S pole of each permanent magnet 22 is fixed to the transfer iron core 30.

  The electromagnetic coil 21 is disposed so as to pass between the trunk portion 23 and the vertical iron core portion 29. In this example, the electromagnetic coil 21 surrounds the trunk portion 23 in the projection plane in the axial direction. Thereby, when the electromagnetic coil 21 is energized, it generates a magnetic flux that passes through the fixed iron core 19 and the movable iron core 20. Further, the direction of the magnetic flux generated by the electromagnetic coil 21 can be reversed by switching the energization direction to the electromagnetic coil 21. The central axis of the electromagnetic coil 21 substantially coincides with the axis of the electromagnetic operation switching device 1.

  11 is a front view showing the movable iron core 20 of FIG. 7, and FIG. 12 is a side view showing the movable iron core 20 of FIG. In the figure, the movable iron core 20 has a plurality of thin plates 36 made of a magnetic material. The movable iron core 20 is a laminated body in which the thin plates 36 are laminated in a direction perpendicular to the axial direction. Each thin plate 36 is integrated by being fastened by a plurality of bolts 37 passed in the stacking direction and nuts 38 screwed to the respective bolts 37.

  13 is a front view showing the thin plate 36 of FIG. 12, FIG. 13 (a) is a front view showing the thin plate arranged at both ends in the stacking direction, and FIG. 13 (b) is shown in the middle portion in the stacking direction. It is a front view which shows the thin plate. As shown in the drawing, the shape of each thin plate 36 is different from each other at both end portions and the intermediate portion in the stacking direction of the movable core 20 because the fixing member 25 is fitted into the movable core 20. The shape of the thin plate 36a disposed at both ends in the stacking direction of the movable iron core 20 is the same shape as the cross-sectional shape of the movable iron core 20 in a plane parallel to the axial direction and including both the trunk portion 23 and each branch portion 24. It has become. Further, the shape of the thin plate 36b and the thin plate 36c disposed in the intermediate portion in the stacking direction of the movable iron core 20 is a shape obtained by removing the portion where the fixing member 25 and the drive shaft 8 are disposed from the shape of the thin plate 36a. Yes. In this example, the thin plate 36b and the thin plate 36c are formed separately, but the thin plate 36b and the thin plate 36c may be formed integrally.

  The material of the movable core 20 may be a magnetic material having a high magnetic permeability, and examples thereof include steel, electromagnetic soft iron, silicon steel, ferrite, and permalloy. Moreover, the movable iron core 20 is good also as a powder iron core which compressed and hardened iron powder, for example.

  14 is a front view showing the fixed iron core 19 of FIG. 7, and FIG. 15 is a side view showing the fixed iron core 19 of FIG. In the figure, the first fixed iron core portion 26 has a plurality of thin plates 39 made of a magnetic material. The first fixed iron core portion 26 is a laminated body in which the thin plates 39 are laminated in a direction perpendicular to the axial direction. The shape of each thin plate 39 is the same as the cross-sectional shape of the first fixed core portion 26 in a plane parallel to the axial direction and including both the horizontal core portion 28 and the vertical core portion 29. Each thin plate 39 is integrated by being fastened by a plurality of bolts 40 passed in the stacking direction and nuts 41 screwed into the bolts 40.

  Each passing iron core part 30 is a steel material formed into a rectangular parallelepiped. The spacer 31 is a steel material having a predetermined thickness formed into a plate shape. The transfer iron core 30 and the spacer 31 are stacked on the first fixed iron core 26 in the order of the spacer 31 and the transfer iron core 30 in the stacking direction of the thin plates 39 of the first fixed iron core 26.

  The second fixed core portion 27 includes one transfer core portion 30, one spacer 31, each thin plate 39, the other spacer 31 and the plurality of bolts 42 passed through in the order of the other transfer core portion 30, and each bolt 42. By being fastened by the screwed nut 43, it is integrated with the first fixed core part 26.

  The material of the fixed iron core 19 may be a magnetic material having a high magnetic permeability, and examples thereof include steel, electromagnetic soft iron, silicon steel, ferrite, and permalloy. Moreover, the fixed iron core 19 is good also as a powder iron core which compressed and hardened iron powder, for example. Furthermore, in this example, the first fixed iron core portion 26 is produced by laminating a plurality of thin plates 39. However, the first fixed iron core portion 26 may be produced by integral molding of a magnetic material. You may produce the 1st fixed iron core part 26 by combining a division body. In this example, the transfer iron core 30 is manufactured by integral molding of a magnetic material. However, the transfer iron core 30 may be manufactured by laminating thin plates, or the transfer iron core 30 may be transferred by combining a plurality of divided bodies. The iron core 30 may be produced.

  FIG. 16 is a partially broken perspective view showing the electromagnet device 10 when the movable iron core 20 of FIG. 7 is held at the advanced position by the holding magnetic flux of the permanent magnet 22. In the figure, the magnetic flux for holding generated by the permanent magnet 22 passes through the first magnetic flux path 44 or the second magnetic flux path 45. The first magnetic flux path 44 passes from the permanent magnet 22 through the trunk portion 23, the first movable surface 34, the first fixed surface 32, the transverse core portion 28, the longitudinal iron core portion 29, the spacer 31, and the transfer iron core portion 30 in this order. This is a path returning to the permanent magnet 22. The second magnetic flux path 45 passes through the permanent magnet 22, the trunk portion 23, the branch portion 24, the second movable surface 35, the second fixed surface 33, the vertical iron core portion 29, the spacer 31, and the transfer iron core portion 30 in order. This is a path returning to the magnet 22.

  When the movable iron core 20 is in the forward position, the gap between the first fixed surface 32 and the first movable surface 34 and the gap between the second fixed surface 33 and the second movable surface 35 are such that the movable iron core 20 is in the retracted position. It is narrower than when. Thereby, the magnetic resistance of the first magnetic flux path 44 and the second magnetic flux path 45 is reduced. Accordingly, the suction force F1 between the first fixed surface 32 and the second movable surface 34 and the suction force F2 between the second fixed surface 33 and the second movable surface 35 are increased, and the movable core 20 is opened. The spring 11 is held at the advanced position against the urging force of the spring 11.

  FIG. 17 is a partially broken perspective view showing the electromagnet device 10 when releasing the holding of the movable iron core 20 in FIG. 16 at the advanced position. In the figure, when the holding of the movable iron core 20 at the forward position is released, the electromagnetic coil 21 generates a release magnetic flux that is opposite to the holding magnetic flux between the first fixed surface 32 and the first movable surface 34 by energization. appear. Thereby, most of the release magnetic flux generated by the electromagnetic coil 21 passes through the third magnetic flux path 46 provided avoiding the permanent magnet 22. The third magnetic flux path 46 passes through the first movable surface 34, the trunk portion 23, the branch portion 24, the second movable surface 35, the second fixed surface 33, the vertical iron core portion 29, the horizontal iron core portion 28, and the first fixed surface 32. Thus, the path returns to the first movable surface 34.

  That is, when the movable iron core 20 is in the forward movement position, the total size of the gap between the first fixed surface 32 and the first movable surface 34 and the gap between the second fixed surface 33 and the second movable surface 35 is the transfer iron core portion. It is narrower than the gap dimension between 30 and the backbone 23. The direction of the release magnetic flux generated by the electromagnetic coil 21 is opposite to the direction of the holding magnetic flux in the permanent magnet 22. Thereby, the magnetic resistance of the first magnetic flux path 44 is extremely larger than the magnetic resistance of the third magnetic flux path 46. Therefore, most of the release magnetic flux generated by the electromagnetic coil 21 passes through the third magnetic flux path 46. Thereby, it is suppressed that the cancellation | release magnetic flux passes the permanent magnet 22, and progress of the demagnetization of the permanent magnet 22 is suppressed. Moreover, as shown in FIG. 18, since the eddy current 47 flows through the first magnetic flux path 44, the progress of demagnetization of the permanent magnet 22 is further suppressed.

  When the release magnetic flux is generated, the attractive force F1 is reduced because the direction of the holding magnetic flux passing between the first fixed surface 32 and the first movable surface 34 is opposite to the release magnetic flux. Further, in the axial projection surface, the area of the portion where the second fixed surface 33 and the second movable surface 35 overlap is smaller than the area of the portion where the first fixed surface 32 and the first movable surface 34 overlap. 2 The holding magnetic flux and the releasing magnetic flux passing between the fixed surface 33 and the second movable surface 35 are easily saturated, and an increase in the attractive force F2 is suppressed. As a result, the suction force between the movable iron core 20 and the first fixed iron core portion 26 is reduced as a whole, and the movable iron core 20 is displaced from the forward movement position to the backward movement position by the biasing force of the release spring 9. In this way, the holding of the movable iron core 20 at the forward position is released.

  FIG. 19 is a partially broken perspective view showing the electromagnet device 10 when the movable iron core 20 of FIG. 7 is displaced from the retracted position to the advanced position. In the figure, when the movable iron core 20 is displaced from the retracted position to the advanced position, the electromagnetic coil 21 is energized so that the closing magnetic flux is in the same direction as the holding magnetic flux between the first fixed surface 32 and the first movable surface 34. Is generated. The closing magnetic flux is generated by energizing the electromagnetic coil 21 in the direction opposite to the energizing direction when generating the release magnetic flux. As a result, the closing magnetic flux generated by the electromagnetic coil 21 passes through the first magnetic flux path 44 and the third magnetic flux path 46.

  When the closing magnetic flux is generated, the direction of the holding magnetic flux passing between the first fixed surface 32 and the first movable surface 34 is the same as the direction of the closing magnetic flux. growing. Between the second fixed surface 33 and the second movable surface 35, the direction of the magnetic flux for closing is opposite to the direction of the magnetic flux for holding, but when the movable iron core 20 is in the retracted position, the magnetic coil 21 is closed. When the movable magnetic core 20 is much larger than the holding magnetic flux and the movable iron core 20 is in the forward position, the attractive force between the movable iron core 20 and the first fixed iron core portion 26 is entirely due to the balance between the attractive force F1 and the attractive force F2. As will grow. As a result, the movable iron core 20 is displaced from the retracted position to the advanced position against the urging force of the release spring 9.

  FIG. 20 is a graph showing the relationship between the magnetic flux density B and the magnetizing force H for the magnetic material of the movable core 20 and the first fixed core portion 26 of FIG. As shown in the drawing, of the first fixed iron core portion 26 and the movable iron core 20, at least the first fixed surface 32, the second fixed surface 33, the first movable surface 34, and the second movable surface 35 are provided. The characteristics of the magnetic material are set in a range A in which saturation of magnetic flux is started by the magnetic flux for holding the permanent magnet 22. Thereby, the magnetic flux for holding the permanent magnet 22 can be effectively contributed to hold the movable iron core 20 at the advanced position.

  Further, when releasing the holding of the movable iron core 20 at the forward position, a release magnetic flux is generated in the direction of decreasing the magnetic flux density between the first fixed surface 32 and the first movable surface 34, and the second fixed surface 33. And the second movable surface 35 generate a release magnetic flux in the direction of increasing the magnetic flux density. In this case, since the magnetic materials of the movable iron core 20 and the first fixed iron core portion 26 are set within the range A, the magnetic flux between the first fixed surface 32 and the first movable surface 34 is reduced (the arrow in FIG. 20). X) is performed quickly, and an increase in magnetic flux (arrow Y in FIG. 20) between the second fixed surface 33 and the second movable surface 35 is suppressed. As a result, the suction force between the movable iron core 20 and the first fixed iron core portion 26 can be quickly reduced as a whole. That is, the release magnetic flux generated by the electromagnetic coil 21 can be effectively contributed to release the holding of the movable iron core 20. Since the release magnetic flux generated by the electromagnetic coil 21 is large, the hysteresis of the magnetic material can be ignored.

  Next, the operation will be described. When the movable contact 3 is in an open state away from the fixed contact 2, the movable iron core 20 is displaced to the retracted position by the urging force of the release spring 9. When a magnetic flux for closing passing through the first magnetic flux path 44 and the third magnetic flux path 46 is generated by energization of the electromagnetic coil 21 (FIG. 19), the movable iron core 20 is attracted to the first fixed iron core portion 26 and the open spring 9. Displaced from the retracted position toward the advanced position against the urging force. As a result, the movable contact 3 is displaced toward the fixed contact 2.

  Thereafter, when the movable contact 3 comes into contact with the fixed contact 2, the displacement of the movable contact 3 is stopped. However, the movable iron core 20 is further displaced to reach the advanced position. Thereby, the contact pressure spring 18 is contracted and the movable contact 3 is pressed against the fixed contact 2 to complete the closing operation (FIG. 2).

  When the movable iron core 20 reaches the forward movement position, the movable iron core 20 is attracted and held by the first fixed iron core portion 26 by the holding magnetic flux of the permanent magnet 22 passing through the first magnetic flux path 44 and the second magnetic flux path 45 (FIG. 16). The movable iron core 20 is held at the forward movement position.

  When releasing the holding of the movable core 20 at the forward position, the electromagnetic coil 21 is energized in the opposite direction to that during the closing operation. When the electromagnetic coil 21 is energized, a release magnetic flux passing through the third magnetic flux path 46 is generated (FIG. 17). As a result, the suction force between the movable iron core 20 and the first fixed iron core portion 26 is reduced as a whole, and the biasing force of the release spring 9 and the contact pressure spring 18 causes the movable iron core 20 to move from the advance position to the retreat position. Displacement is started. At this time, the movable contact 3 remains pressed against the fixed contact 2.

  Thereafter, when the movable iron core 20 is further displaced toward the retracted position, the stopper plate 17 is engaged with the spring frame 16. After this, the movable contact 3 is separated from the fixed contact 2 by the movable iron core 20 being displaced toward the retracted position. Thereafter, the movable iron core 20 is further displaced to reach the retracted position. This completes the opening operation (FIG. 1).

  In such an electromagnet device 10, the movable iron core 20 is displaced in the axial direction, and the first movable surface 34 provided on the trunk portion 23 of the movable iron core 20 and the first fixed surface 32 provided on the fixed iron core 9. Are opposed in the axial direction, and the second movable surface 35 provided in the branch portion 24 of the movable iron core 20 and the second fixed surface 33 provided in the fixed iron core 9 are opposed in the axial direction. Since only one of the N pole and S pole of the permanent magnet 22 provided in 19 faces the trunk portion 23 in the direction perpendicular to the axial direction, the holding of the movable core 20 at the advanced position is released. Sometimes, the release magnetic flux can be generated while avoiding the permanent magnet 22. Thereby, progress of the demagnetization of the permanent magnet 22 can be suppressed. Further, the dimension between the permanent magnet 22 and the movable iron core 20 does not change greatly due to the displacement of the movable iron core 20 in the axial direction. That is, even if the movable core 20 moves forward or backward due to wear of the movable core 20 or the like, the gap size between the permanent magnet 22 and the movable core 20 does not change. From this, the clearance dimension between the permanent magnet 22 and the movable iron core 20 and the thickness dimension of the permanent magnet 22 can be set small without considering the wear of the movable iron core 20 and the like. Therefore, the electromagnet device 10 can be downsized.

  In the axial projection plane, the area of the portion where the first fixed surface 32 and the first movable surface 34 overlap each other is larger than the area of the portion where the second fixed surface 33 and the second movable surface 35 overlap each other. Therefore, by generating the release magnetic flux that releases the holding of the movable core 20 at the forward position, the suction force between the first fixed surface 32 and the first movable surface 34 can be quickly reduced. The increase in suction force between the second fixed surface 33 and the second movable surface 35 can be suppressed. Accordingly, it is possible to release the holding of the movable iron core 20 at the advanced position earlier and more reliably.

  The fixed iron core 19 includes a first fixed iron core portion 26 provided with the first fixed surface 32 and the second fixed surface 33, and a second fixed iron core portion 27 provided with the permanent magnet 22. The fixed core portion 26 is configured by stacking a plurality of thin plates 39 in a direction perpendicular to the axial direction, and the second fixed core portion 27 is overlapped with the first fixed core portion 26 in the stacking direction of the thin plates 39. Therefore, it is possible to suppress the release magnetic flux in the opposite direction to the holding magnetic flux from passing through the permanent magnet 22 by generating an eddy current at the joint portion between the first fixed iron core portion 26 and the second fixed iron core portion 27. it can. Thereby, the progress of demagnetization of the permanent magnet 22 can be further suppressed.

  In such an electromagnetically operated switching device 1, the driving device 5 biases the driving shaft 8 connected to the movable contact 3 to be displaced and the movable shaft 3 away from the fixed contact 2. Since the open spring 9 and the electromagnet device 10 that displaces the drive shaft 8 in the direction in which the movable contact 3 contacts the fixed contact 2 against the urging force of the open spring 9 are provided, the same as the electromagnet device 10 described above. The movable contact 3 can be more reliably separated from the fixed contact 2 by the biasing force of the release spring 9 when the holding of the movable iron core 20 at the advanced position is released in the electromagnet device 10. Can do. Thereby, the improvement of the reliability of operation | movement of the electromagnetic operation opening / closing apparatus 1 can be aimed at.

  When the movable iron core 20 is in the forward movement position, there may be a gap between the first fixed surface 32 and the first movable surface 34, or the first fixed surface 32 and the first movable surface 34 are in contact with each other. It may be. When the movable iron core 20 is in the forward movement position, there may be a gap between the second fixed surface 33 and the second movable surface 35, or the second fixed surface 33 and the second movable surface 35 are in contact with each other. It may be.

  In the above example, the N pole of the permanent magnet 22 is opposed to the trunk portion 23, but the S pole of the permanent magnet 22 may be opposed to the trunk portion 23. In this case, the energization direction to the electromagnetic coil 21 when generating the release magnetic flux and the closing magnetic flux is opposite to the above example. Even if it does in this way, the effect similar to said example can be acquired.

Embodiment 2. FIG.
In the first embodiment, the permanent magnet 22 is disposed outside the region of the movable iron core 20 in the projection plane in the axial direction, but if it is outside each region of the first movable surface 34 and the second movable surface 35. The permanent magnet 22 may be in the region of the movable iron core 20. Therefore, each permanent magnet 22 may be disposed in a space between each branch portion 24 and the electromagnetic coil 21.

Embodiment 3 FIG.
In the first embodiment, the area of the portion where the first fixed surface 32 and the first movable surface 34 overlap each other in the axial projection surface is the area of the portion where the second fixed surface 33 and the second movable surface 35 overlap each other. However, when the movable iron core 20 is in the advanced position, the gap dimension between the first fixed surface 32 and the first movable surface 34 is such that the second fixed surface 33 and the second movable surface 35 You may make it become smaller than the gap dimension between. Even in this case, when releasing the holding of the movable iron core 20 at the forward position, the suction force between the first fixed surface 32 and the first movable surface 34 can be quickly reduced, and the second An increase in suction force between the fixed surface 33 and the second movable surface 35 can be suppressed.

Embodiment 4 FIG.
FIG. 21 is a cross-sectional view showing a main part of an electromagnet device according to Embodiment 4 of the present invention. In the figure, the permanent magnet 22 is fixed to the transfer iron core 30 by a magnet mounting part 51. The magnet attachment component 51 has a holding part 51a that covers the permanent magnet 22 and a pair of fastening parts (not shown) that are provided at both ends of the holding part 51a and fastened to the transfer iron core part 30 with screws or the like. ing. The magnet mounting part 51 is made of a low magnetic material (for example, stainless steel or brass) having a low magnetic permeability.

Even if a low magnetic material (pressing portion 51 a) is interposed between the permanent magnet 22 and the backbone portion 23, the magnetic resistance between the permanent magnet 22 and the backbone portion 23 is hardly changed. Accordingly, gap size g _PMA between the permanent magnet 22 and the core portion 23 is the same size as when the pressing portion 51a is not interposed between the permanent magnet 22 and the core portion 23. That is, the gap dimension g _PMA is the gap between the first fixed surface 32 and the first movable surface 34 when the movable iron core 20 is in the forward position, and between the second fixed surface 33 and the second movable surface 35. It is set smaller than the total dimension of the gaps. The thickness dimension of the pressing portion 51a is smaller than the gap dimension g _PMA . Other configurations are the same as those in the first embodiment.

  Even if it does in this way, the effect similar to Embodiment 1 can be acquired. Further, the permanent magnet 22 can be easily attached to the transfer iron core 30.

Embodiment 5 FIG.
In the fourth embodiment, the material of the magnet mounting part 51 is a low magnetic material, but the material of the magnet mounting part 51 may be a magnetic material.

  That is, FIG. 22 is a sectional view showing a main part of an electromagnet device according to Embodiment 5 of the present invention. In the figure, the permanent magnet 22 is fixed to the transfer iron core 30 by a magnet mounting part 61. The magnet attachment component 61 includes a holding portion 61a that covers the permanent magnet 22 and a pair of fastening portions (not shown) that are provided at both ends of the holding portion 61a and fastened to the transfer iron core portion 30 by screws. ing. The magnet mounting part 61 is made of a magnetic material having a high magnetic permeability (for example, steel, electromagnetic soft iron, silicon steel, ferrite, permalloy, etc.).

The gap dimension g _PMB between the holding part 61a and the core part 23 is the gap between the first fixed surface 32 and the first movable surface 34 when the movable iron core 20 is in the advanced position, and the second fixed surface 33. And the total dimension of the gap between the second movable surface 35 and the second movable surface 35 is set to be smaller. Other configurations are the same as those in the first embodiment. Even if it does in this way, the effect similar to Embodiment 4 can be acquired.

Embodiment 6 FIG.
FIG. 23 is a cross-sectional view showing a main part of an electromagnet device according to Embodiment 6 of the present invention. In the figure, the movable iron core 20 is in contact with the first rectangular parallelepiped 71 whose dimension in the axial direction is larger than the dimension perpendicular to the axial direction, and the first rectangular parallelepiped 71 in the axial direction, and the dimension perpendicular to the axial direction is in the axial direction. And a second rectangular parallelepiped 72 having a larger dimension. The dimension of the second rectangular parallelepiped 72 is larger than the dimension of the first rectangular parallelepiped 71 in the direction perpendicular to the axial direction. Thereby, the external shape of the movable iron core 20 in this example is the same as the external shape of the movable iron core 20 of the first embodiment. The first rectangular parallelepiped 71 and the second rectangular parallelepiped 72 are each provided with a through hole 73 penetrating in the axial direction.

  The drive shaft 8 is provided in the large diameter shaft portion 74 having an outer diameter larger than the inner diameter of the through hole 73 and the large diameter shaft portion 74 along the axial direction, and has an outer diameter smaller than the inner diameter of the through hole 73. And a small-diameter shaft portion 75. Therefore, a step is provided at the boundary between the large diameter shaft portion 74 and the small diameter shaft portion 75.

  A screw portion 75 a is provided at the tip of the small diameter shaft portion 75. The small diameter shaft portion 75 is passed through the through hole 73 in the order of the first rectangular parallelepiped 71 and the second rectangular parallelepiped 72. Further, the first rectangular parallelepiped 71 is engaged with a step provided at the boundary between the large diameter shaft portion 74 and the small diameter shaft portion 75, and a threaded portion 75 a protrudes from the second rectangular parallelepiped 72.

  The drive shaft 8 is fixed to the movable iron core 20 by being tightened between a nut 76 and a large-diameter shaft portion 74 that are screwed into the screw portion 75a. The first rectangular parallelepiped 71 and the second rectangular parallelepiped 72 are integrated by being fastened between the nut 76 and the large diameter shaft portion 74. The materials of the movable iron core 20 and the drive shaft 8 are the same as those in the first embodiment. Other configurations are the same as those in the first embodiment.

  If it does in this way, the movable iron core 20 can be produced easily and the drive shaft 8 can be easily fixed to the movable iron core 20.

Embodiment 7 FIG.
FIG. 24 is a front view showing an essential part of an electromagnet device according to Embodiment 7 of the present invention. FIG. 24 is a front view of the permanent magnet 22 as viewed from the movable iron core 20. FIG. 25 is a side view showing the permanent magnet 22 of FIG. In the figure, the transfer iron core part 30 has a magnet fixing part 81 to which the permanent magnet 22 is attached and a pair of magnet support parts 82 extending from both side parts of the magnet fixing part 81. The dimension (vertical dimension) in the axial direction of the magnet fixing portion 81 (that is, the direction in which the movable iron core 20 is displaced) is made larger than the dimension (vertical dimension) in the axial direction of each magnet support portion 82. In this example, the outer shape of the transfer iron core portion 30 is a convex shape protruding in the axial direction at the position of the magnet fixing portion 81.

  The permanent magnet 22 overlaps the magnet fixing portion 81 when viewed from the movable iron core 20. The dimension (vertical dimension) of the permanent magnet 22 in the axial direction is the same as the vertical dimension of the magnet fixing portion 81. That is, the vertical dimension of the permanent magnet 22 is made larger than the vertical dimension of the magnet support portion 82.

  The transfer iron core part 30 is a laminated body in which a plurality of thin plates 83 are laminated. The lamination direction of the thin plates 83 is a direction in which the permanent magnet 22 overlaps the magnet fixing portion 81. The shape of each thin plate 83 is also convex. Other configurations are the same as those in the first embodiment.

  If it does in this way, the dimension about the direction of an axis of permanent magnet 22 can be enlarged. Thereby, the suction force for holding the movable iron core 20 at the advanced position can be increased, and the movable iron core 20 can be reliably held at the advanced position.

  In the above example, the outer shape of the transfer iron core portion 30 is convex. However, the vertical dimension of the magnet support portion 82 is the same as the vertical dimension of the magnet fixing portion 81, and the outer shape of the transfer iron core portion 30 is rectangular. It may be.

Embodiment 8 FIG.
In the first embodiment, the insulating rod 14 is provided at a position closer to the movable contact 3 than the pressure contact device 15, but the positions of the insulation rod 14 and the pressure contact device 15 are switched to connect the pressure contact device 15 to the insulation rod. It may be provided at a position closer to the movable contact 3 than 14.

  26 is a longitudinal sectional view showing an electromagnetically operated switchgear according to Embodiment 8 of the present invention. In the drawing, the insulating rod 14 is connected between the movable rod 13 and the drive shaft 8. A pressure contact device 15 is provided at an intermediate portion of the movable rod 13.

  The movable rod 13 is separated into a portion provided on the movable contact 3 and a portion provided on the insulating rod 14. The spring frame 16 of the contact pressure device 15 is fixed to a portion provided on the movable contact 3 of the movable rod 13. The stopper plate 17 of the pressure contact device 15 is fixed to a portion provided on the insulating rod 14 of the movable rod 13. The contact pressure spring 18 is connected between the spring frame 16 and the retaining plate 17. Other configurations are the same as those in the first embodiment. Even if it does in this way, the effect similar to Embodiment 1 can be acquired.

Embodiment 9 FIG.
In the first embodiment, the open spring 9 is provided between the electromagnet device 10 and the coupling device 6, but is not limited thereto.

  FIG. 27 is a longitudinal sectional view showing an electromagnetically operated switching device according to Embodiment 9 of the present invention. In the figure, the drive shaft 8 has a contact side drive shaft 91 protruding from the movable iron core 20 in a direction approaching the movable contact 3 and an anti-contact side drive shaft 92 protruding from the movable iron core 20 in a direction away from the movable contact 3. is doing. The contact-side drive shaft 91 and the non-contact-side drive shaft 92 are respectively fixed to the movable iron core 20 by being screwed into a fixing member 25 fitted in the movable iron core 20. The contact side drive shaft 91 and the non-contact side drive shaft 92 are arranged coaxially. The contact side drive shaft 91 is connected to the movable contact 3 via the connecting device 6. An open spring receiver 11 is fixed to the non-contact side drive shaft 92.

  A receiving member 93 through which the non-contact side drive shaft 92 penetrates in the axial direction is fixed to the fixed iron core 19. An open spring 9 is provided between the open spring receiver 11 and the receiving member 93 in a contracted manner. Thereby, the open spring 9 biases the non-contact side drive shaft 92 in the direction in which the movable iron core 20 is displaced from the forward movement position to the backward movement position. The fixed iron core 19 is fixed to a support member (not shown). Other configurations are the same as those in the first embodiment. Even if it does in this way, the effect similar to Embodiment 1 can be acquired.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the electromagnetically operated opening / closing apparatus by Embodiment 1 of this invention. It is a longitudinal cross-sectional view which shows the state which the contact of the electromagnetic operation switchgear of FIG. 1 has closed. It is sectional drawing which shows the electromagnet apparatus of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is sectional drawing which shows the electromagnet apparatus of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a perspective view which shows the electromagnet apparatus of FIG. It is a front view which shows the electromagnet apparatus of FIG. It is a side view which shows the electromagnet apparatus of FIG. It is a top view which shows the electromagnet apparatus of FIG. It is a front view which shows the movable iron core of FIG. It is a side view which shows the movable iron core of FIG. 13A is a front view showing the thin plate of FIG. 12, FIG. 13A is a front view showing the thin plate disposed at both ends in the stacking direction, and FIG. 13B shows the thin plate disposed in an intermediate portion in the stacking direction. It is a front view. It is a front view which shows the fixed iron core of FIG. It is a side view which shows the fixed iron core of FIG. It is a partially broken perspective view which shows the electromagnet apparatus when the movable iron core of FIG. 7 is hold | maintained in the advance position with the magnetic flux for holding | maintenance of a permanent magnet. It is a partially broken perspective view which shows the electromagnet apparatus when releasing the holding | maintenance in the advance position of the movable iron core of FIG. It is a perspective view which shows a state when the eddy current has generate | occur | produced in the fixed iron core of FIG. It is a partially broken perspective view which shows an electromagnet apparatus when the movable iron core of FIG. 7 is displaced from a retreat position to an advance position. It is a graph which shows the relationship between the magnetic flux density B and the magnetizing force H about the magnetic material of the movable iron core of FIG. 7, and a 1st fixed iron core part. It is sectional drawing which shows the principal part of the electromagnet apparatus by Embodiment 4 of this invention. It is sectional drawing which shows the principal part of the electromagnet apparatus by Embodiment 5 of this invention. It is sectional drawing which shows the principal part of the electromagnet apparatus by Embodiment 6 of this invention. It is a front view which shows the principal part of the electromagnet apparatus by Embodiment 7 of this invention. It is a side view which shows the permanent magnet of FIG. It is a longitudinal cross-sectional view which shows the electromagnetically operated opening / closing apparatus by Embodiment 8 of this invention. It is a longitudinal cross-sectional view which shows the electromagnetically operated opening / closing apparatus by Embodiment 9 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic operation switching device, 2 Fixed contact, 3 Movable contact, 5 Drive device, 8 Drive shaft, 9 Opening spring (biasing body), 10 Electromagnet device, 19 Fixed iron core, 20
Movable iron core, 21 electromagnetic coil, 22 permanent magnet, 23 core part, 24 branch part, 32 1st fixed surface, 33 2nd fixed surface, 34 1st movable surface, 35 2nd movable surface.

Claims (5)

A fixed iron core provided with a first fixed surface and a second fixed surface so as to be positioned away from each other when projected in the axial direction;
A basic portion provided with a first movable surface facing the first fixed surface in the axial direction, and a second movable surface provided in the basic portion and facing the second fixed surface in the axial direction. A movable core that is displaceable in the axial direction between a retracted position away from the fixed iron core and an advanced position closer to the fixed iron core than the retracted position,
A pair of magnetic poles, provided on the fixed iron core, and only one of the pair of magnetic poles is opposed to the movable iron core in a direction perpendicular to the axial direction, and in the projection plane in the axial direction, A permanent magnet disposed outside each region of the first movable surface and the second movable surface, and an electromagnetic coil provided on the fixed iron core,
The permanent magnet generates a holding magnetic flux that holds the movable iron core in the forward position,
The electromagnetic coil generates a magnetic flux in a direction opposite to the holding magnetic flux between the first movable surface and the first fixed surface, thereby releasing the holding of the movable iron core at the forward position, and An electromagnet device that displaces the movable iron core from the retracted position to the advanced position by generating a magnetic flux in the same direction as the holding magnetic flux between one movable surface and the first fixed surface.   In the axial projection plane, the area of the portion where the first fixed surface and the first movable surface overlap each other is larger than the area of the portion where the second fixed surface and the second movable surface overlap each other. The electromagnet device according to claim 1, wherein:   When the movable iron core is in the advanced position, a gap between the first fixed surface and the first movable surface is narrower than a gap between the second fixed surface and the second movable surface. The electromagnet device according to claim 1, wherein The fixed core includes a first fixed core portion provided with the first fixed surface and the second fixed surface, a second fixed core portion provided on the first fixed core portion and provided with the permanent magnet, Have
The first fixed core portion is configured by laminating a plurality of plates in a direction perpendicular to the displacement direction of the movable core.
4. The electromagnet device according to claim 1, wherein the second fixed iron core is overlapped with the first fixed iron core in the stacking direction of the plates. 5. Fixed contact,
A movable contact that can be contacted to and separated from the fixed contact, a drive shaft connected to the movable contact, a biasing body that biases the drive shaft in a direction in which the movable contact is away from the fixed contact, and the biasing body An electromagnet device that displaces the drive shaft in a direction in which the movable contact is in contact with the fixed contact, and a drive device that displaces the movable contact in an axial direction in contact with and away from the fixed contact. Prepared,
The electromagnet device is
A fixed iron core provided with a first fixed surface and a second fixed surface so as to be positioned away from each other when projected in the axial direction;
A basic portion provided with a first movable surface facing the first fixed surface in the axial direction, and a second movable surface provided in the basic portion and facing the second fixed surface in the axial direction. A movable iron core that is displaceable together with the drive shaft,
A pair of magnetic poles, provided on the fixed iron core, and only one of the pair of magnetic poles is opposed to the movable iron core in a direction perpendicular to the axial direction, and in the projection plane in the axial direction, A permanent magnet disposed outside each region of the first movable surface and the second movable surface;
An electromagnetic coil provided on the fixed iron core,
The movable contact is moved away from the fixed contact when the movable iron core is displaced to a retracted position away from the fixed iron core, and the movable iron core is displaced to an advanced position closer to the fixed iron core than the retracted position. Is in contact with the fixed contact,
The permanent magnet generates a holding magnetic flux that holds the movable iron core in the forward position,
The electromagnetic coil generates a magnetic flux in a direction opposite to the holding magnetic flux between the first movable surface and the first fixed surface, thereby releasing the holding of the movable iron core at the forward position, and An electromagnetically operated switchgear that displaces the movable iron core from the retracted position to the advanced position by generating a magnetic flux in the same direction as the magnetic flux for holding between one movable surface and the first fixed surface. .

Images