JPWO2017154720A1 - Electromagnetic actuator and switchgear - Google Patents

Abstract

An object of the present invention is to obtain an electromagnetic actuator capable of applying a stable initial load force to an amateur when driving the amateur without leaking magnetic flux to the outside. The electromagnetic actuator (1) of the present invention is provided with a root portion (amateur root portion (11)) and extending from the root portion (11) in the direction of the coil axis (4a) of the coil (4) and the root portion ( A magnetic body that forms a magnetic path through which the magnetic flux generated by the coil (4) passes with the armature (3), and the armature (3) having a stretched portion (amateur stretched portion (12)) having a smaller outer diameter than 11) And a core (2). The core (3) has a suction part (15) that generates a suction force between the core (3) and the circumferential extension part (11b) when magnetic flux passes, and the suction part (15) On the outside of the first magnetic path (M1) through which the magnetic flux passes, facing the armature (3) and forming the second magnetic path (M2) through which the magnetic flux passes (inner peripheral surface (9a) ).

Description

  The present invention relates to an electromagnetic actuator used for an opening / closing operation of an electromagnetically operated opening / closing device or the like.

  In an electromagnetically operated switchgear or the like, an electromagnetic actuator is used in an open / close operation that opens or closes the current interrupting portion. Patent Document 1 describes an electromagnet device for closing a circuit breaker that opens and closes a vacuum circuit breaker corresponding to a current interrupting unit that conducts and interrupts current via a link mechanism.

  The electromagnetic device for insertion described in FIG. 7 of Patent Document 1 is arranged around a solenoid coil, an armature of a magnetic material that can reciprocate in the axial direction of the solenoid coil (plunger 3 of Patent Document 1), and a solenoid coil. The core (the yoke 5 of Patent Document 1) serving as a magnetic flux path, the magnetic support plate of the magnetic material that supports the lower surface of the armature, and the magnetic support plate and the lower end portion of the core (the lower end plate 5C of Patent Document 1) are connected. It is an electromagnetic actuator provided with the magnetic support | pillar of a magnetic body. Further, a gap sandwiched between non-magnetic spacers is formed between the lower end portion of the core and the amateur in the axial direction of the solenoid coil.

  The electromagnetic actuator described in Patent Document 1 causes the armature to move away from the magnetic support plate by causing a current to flow through the solenoid coil when the circuit breaker is turned on. When a current is applied by applying a voltage to the solenoid coil, the magnetic flux passing through the armature flows mainly through the magnetic support plate and the magnetic column because there are nonmagnetic spacers and air gaps when the current value at the initial energization is small. The amateur is attracted to the magnetic support plate by this magnetic flux. This suction force is a force that works in a direction that cancels the driving force that drives the amateur, and is an initial load force that acts as a load in the early stage of amateur driving. When the current of the solenoid coil increases with the passage of time, the magnetic support plate is composed of a relatively thin plate, so that magnetic saturation is reached immediately, and the attractive force between the amateur and the magnetic support plate is kept almost constant. On the other hand, the magnetic flux flowing from the amateur through the air gap into the lower end of the core increases as the current value of the solenoid coil increases, so the driving force that lifts the amateur away from the magnetic support plate and pulls it upward is the current. Increases with increasing value. When the upward driving force of the amateur exceeds the attractive force between the amateur and the magnetic support plate, the amateur moves away from the magnetic support plate and moves upward, and the shaft (rod) fixed to the upper surface of the amateur Is delivered and the electromagnetic actuator turns on the circuit breaker.

  By adopting such a configuration, the electromagnetic actuator described in Patent Document 1 has an attractive force generated between the armature and the magnetic support plate until the coil current becomes sufficiently large as compared with the case where the magnetic support plate is not provided. I was able to hold an amateur. Therefore, since the electromagnetic actuator described in Patent Document 1 moves the armature after the coil current is sufficiently large, the driving force of the armature can be increased, and the armature can be reliably moved to a predetermined position. It becomes possible.

Japanese Unexamined Patent Publication No. 7-37460 (paragraphs 0002 to 0003, FIG. 7)

  In the electromagnetic actuator described above, an initial load force acting in a direction to cancel the driving force of the amateur is applied by an attractive force generated between the amateur and a magnetic support plate disposed on the lower side of the amateur. However, since the magnetic circuit that generates the initial load force faces the outside of the electromagnetic actuator, when this magnetic circuit is magnetically saturated, leakage magnetic flux is generated outside the electromagnetic actuator. For this reason, the electromagnetic actuator described in Patent Document 1 is assumed from a peripheral magnetic body via a magnetic support plate when a device including a magnetic body or a jig such as a fastening member of the electromagnetic actuator is disposed around the electromagnetic actuator. The above magnetic flux may flow to the amateur, and the initial load force in the direction opposite to the driving force for driving the amateur increases, so that the amateur cannot be driven. That is, in the electromagnetic actuator described in Patent Document 1, when the magnetic circuit is magnetically saturated, the magnetic flux leaks to the outside of the electromagnetic actuator, so that the initial load force applied to the amateur varies when a magnetic body is disposed around the electromagnetic actuator. As a result, there is a problem that the drive characteristics of the electromagnetic actuator deteriorate.

  In the electromagnetic actuator described in Patent Document 1, the magnetic circuit that generates the initial load force faces the outside of the electromagnetic actuator. When this magnetic circuit is magnetically saturated, a leakage magnetic flux is generated outside the electromagnetic actuator. If a magnetic material is disposed around the peripheral device, it may cause a failure or malfunction of a peripheral device including the magnetic material, and even a peripheral device that does not include magnetism may cause a failure or malfunction due to strong magnetic flux leakage. Cause.

  The present invention solves the above-described problems, and an object of the present invention is to obtain an electromagnetic actuator that can give a stable initial load force to an amateur when driving the amateur without leaking magnetic flux outside the electromagnetic actuator. .

  The electromagnetic actuator of the present invention drives an armature of a magnetic body that is movably disposed inside a coil by a magnetic flux generated by the coil. The electromagnetic actuator is disposed on the outside of the coil, the root portion, the armature that extends from the root portion in the direction of the coil axis of the coil and has an extending portion having a smaller outer diameter than the root portion, and the coil. A magnetic core that forms a magnetic path through which the magnetic flux generated by the coil passes with the armature, and the armature has a circumferentially extending portion that extends in the circumferential direction perpendicular to the coil axis from the outer periphery of the extending portion. The core is provided opposite to the circumferential extension portion of the amateur, and has a suction portion that generates an attractive force between the core and the circumferential extension portion when the magnetic flux passes, It has the armature opposing part which forms the 2nd magnetic path which opposes an amateur and passes a magnetic flux outside the 1st magnetic path through which a magnetic flux passes an attraction | suction part.

  The electromagnetic actuator of the present invention includes a first magnetic path through which a magnetic flux passes through an attraction portion provided inside a core, and a second magnetic path through which the magnetic flux passes while facing the armature outside the first magnetic path. Therefore, a stable initial load force can be applied to the armature when driving the armature without leaking the magnetic flux to the outside of the electromagnetic actuator.

It is a figure which shows the electromagnetic actuator and switchgear by Embodiment 1 of this invention. It is a figure which shows the electromagnetic actuator and switchgear by Embodiment 1 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 1 of this invention. It is a schematic sectional drawing which shows the principal part of the electromagnetic actuator of FIG. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 2 of this invention. It is a schematic sectional drawing which shows the principal part of the electromagnetic actuator of FIG. It is a schematic sectional drawing of the other electromagnetic actuator by Embodiment 2 of this invention. It is a schematic sectional drawing which shows the principal part of the electromagnetic actuator of FIG. It is a figure which shows the example of the provision force of the electromagnetic actuator by Embodiment 2 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 3 of this invention. It is a schematic sectional drawing which shows the principal part of the electromagnetic actuator of FIG. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 4 of this invention. It is a schematic sectional drawing of the other electromagnetic actuator by Embodiment 4 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 5 of this invention. It is a schematic sectional drawing of the other electromagnetic actuator by Embodiment 5 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 6 of this invention. It is a figure which shows the example of the coil current of the electromagnetic actuator by Embodiment 6 of this invention. It is a figure which shows the electromagnetic actuator and switchgear by Embodiment 7 of this invention. It is a figure which shows the electromagnetic actuator and switchgear by Embodiment 7 of this invention. It is a fragmentary view of the 1st electromagnetic actuator by Embodiment 7 of this invention. FIG. 21 is a partial view of the core and amateur of FIG. 20. It is a figure of the shock absorbing material of FIG. It is a fragmentary figure of the 2nd electromagnetic actuator by Embodiment 7 of this invention. It is a figure of the shock absorbing material of FIG. It is a fragmentary view of the 3rd electromagnetic actuator by Embodiment 7 of this invention. It is a figure which shows the shock absorbing material of FIG. It is a fragmentary figure of the 4th electromagnetic actuator by Embodiment 7 of this invention. It is a figure of the shock absorbing material of FIG. It is a figure explaining the coil current control of the electromagnetic actuator of Embodiment 8 of this invention. It is a figure explaining the coil current control of the electromagnetic actuator of Embodiment 8 of this invention. It is a figure which shows the example of the electric current supply apparatus by Embodiment 8 of this invention. It is a figure which shows the example of the electric current supply apparatus by Embodiment 8 of this invention. It is a figure which shows the example of the electric current supply apparatus by Embodiment 8 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 8 of this invention. It is a schematic sectional drawing of the electromagnetic actuator by Embodiment 8 of this invention.

Embodiment 1 FIG.
1 and 2 are diagrams showing an electromagnetic actuator and a switchgear according to Embodiment 1 of the present invention. FIG. 1 shows a first state of the electromagnetic actuator, and FIG. 2 shows a second state of the electromagnetic actuator. FIG. 3 is a schematic cross-sectional view of the electromagnetic actuator according to Embodiment 1 of the present invention, and FIG. 4 is a schematic cross-sectional view showing the main part of the electromagnetic actuator of FIG. The electromagnetic actuator 1 includes a magnetic core 2, a magnetic armature 3 movably provided inside the core 2, a coil 4 that generates a magnetic flux in a magnetic path formed by the core 2 and the armature 3, and A magnetic force generated by the coil 4 passes between the shaft 5 fixed to the amateur 3 and penetrating the core 2 and between the core 2 and the armature 3 to generate an attraction force. There are provided suction portions 15 and 16 for applying a load force acting in a direction to cancel the drive force for driving in the direction in which 5 is delivered. The core 2 and the armature 3 form a magnetic path through which the magnetic flux generated by the coil 4 passes. The opening / closing device 50 includes the electromagnetic actuator 1, the link mechanism 24, and the current interrupting unit 21. The shaft 5 is connected to the current interrupting part 21 of the switching device 50 via the link mechanism 24. The current interrupting unit 21 includes a movable contact 22 and a fixed contact 23 inside. The switchgear 50 moves the movable contact 22 of the current interrupting part 21 so as to be connected to the fixed contact 23 via the link mechanism 24, and performs a closing operation to bring the current interrupting part 21 into a closed state. The shaft 5 is disposed so that the central axis passing in the extending direction coincides with the coil axis 4 a passing through the opening center of the coil 4. When the armature 3 moves to the exposed end 5a of the shaft 5 and the magnetic gap between the suction part 15 and the suction part 16 increases, the attractive force between the suction part 15 and the suction part 16 decreases rapidly, The load force that works in the direction that cancels the drive force that drives the amateur 3 in the direction in which the shaft 5 is delivered is generated in the early stage of driving of the amateur 3, and is therefore referred to as the initial load force as appropriate. The direction in which the amateur 3 moves to the exposed end 5a of the shaft 5 is also the direction in which the amateur 3 changes from the first state to the second state, so the driving force that drives the amateur 3 in the direction in which the shaft 5 is delivered is This is a driving force for driving the amateur 3 from the first state to the second state.

  When the electromagnetic actuator 1 is in the first state shown in FIG. 1, that is, when the exposed end portion 5a of the shaft 5 is approaching the core 2, the movable contact 22 and the fixed contact 23 of the current interrupting portion 21 are separated from each other. ing. When the electromagnetic actuator 1 is in the second state shown in FIG. 2, that is, when the exposed end 5 a of the shaft 5 is away from the core 2, the movable contact 22 and the fixed contact 23 of the current interrupter 21 are mutually connected. In contact. 1 and 2, the electromagnetic actuator 1 shows a configuration example in which an opening / closing operation for opening or closing the current interrupting portion 21 of the opening / closing device 50 is performed. 1 and 2, cross-sectional views of the electromagnetic actuator 1 and the current interrupting unit 21 are shown, but hatching is omitted in the cross-section so as not to make it difficult to see the lead lines and the like. 3 and 4 also show cross-sectional views of the electromagnetic actuator 1, but hatching is omitted in the cross-section so as not to make it difficult to see the lead lines and the like. In addition, in FIGS. 1 to 4, the outer peripheral line (the outer peripheral line in the direction perpendicular to the moving direction of the shaft 5) that is originally visible from the cross section of the left and right coils 4 on the back side of the drawing surface is not easily visible. Omitted. Similarly, in other cross-sectional views, hatching is omitted in the cross section, and an outer peripheral line in a direction perpendicular to the moving direction of the shaft 5 in the coil 4 is omitted.

  The core 2 includes a core body portion 7 that surrounds the outer peripheral surface of the coil 4, a core lid portion 8 that covers the upper side of the coil 4 (side on which the shaft 5 is disposed), and a lower side (core lid portion 8) of the core body portion 7. And the core opening end portion 9 which extends in the direction of the shaft 5 from the side where the armature 3 is not disposed and forms an opening 14 where the armature extending portion 12 of the armature 3 is exposed to the outside. The core opening end portion 9 forms an opening 14 through which the amateur extending portion 12 of the amateur 3 can be inserted. The core lid portion 8 faces the core opening end portion 9 at a position away from the core opening end portion 9 in the direction of the coil shaft 4a. The core body portion 7 connects the core lid portion 8 and the core opening end portion 9. The amateur 3 includes an amateur root portion 11 to which the shaft 5 is connected, and an amateur extending portion 12 provided so as to extend from the amateur root portion 11 to the opening 14 side of the core 2 and having an outer diameter smaller than that of the amateur root portion 11. Prepare. A through hole is formed in the core lid portion 8 of the core 2, and the shaft 5 moves through the through hole in the vertical direction in the figure (the vertical direction of the coil shaft 4 a). The through hole of the core lid part 8 is formed so that the central axis thereof coincides with the coil axis 4a. Further, the central axis of the shaft 5 coincides with the central axis of the amateur 3. By inserting the shaft 5 into the through hole of the core lid portion 8, the armature 3 is disposed inside the coil 4 and the core 2 so that the central axis of the shaft 5 and the armature 3 coincides with the coil axis 4 a. Each of the shaft 5, the amateur root portion 11, and the amateur extending portion 12 has a cylindrical shape, for example. The coil 4 has, for example, a cylindrical shape with an opening, and the outer shape of the core 2 has, for example, a cylindrical shape in which a through hole is formed in the upper part and an opening 14 is formed in the lower part.

  In the amateur 3, the outer peripheral surface 11 a of the amateur root portion 11 faces the inner peripheral surface of the coil 4, and the outer peripheral surface 12 a of the amateur extension portion 12 faces the inner peripheral surface 9 a of the core opening end 9 in the core 2. Are arranged. The inner peripheral surface 9a is an amateur facing portion that forms a magnetic path M2 that faces the outer peripheral surface 12a of the armature 3 and through which the magnetic flux generated by the coil 4 passes. The outer diameter of the amateur extending portion 12 is smaller than the outer diameter of the amateur root portion 11. On the amateur extending portion 12 side of the amateur root portion 11, a circumferentially extending portion 11b extending in the circumferential direction from the outer periphery of the amateur extending portion 12 is formed. A portion of the circumferentially extending portion 11 b in the amateur root portion 11 faces a portion of the inner side surface 9 b of the core opening end portion 9 in the core 2. The portions where the circumferentially extending portion 11 b and the inner side surface 9 b of the core opening end portion 9 face each other are suction portions 15 and 16. That is, the suction portion 15 of the core opening end portion 9 in the core 2 and the suction portion 16 of the circumferential extension portion 11b in the armature 3 face each other.

  The suction portion 15 of the core 2 has an end on the coil shaft 4 a side (inner peripheral side) that is the inner peripheral surface 9 a of the core opening end portion 9, and an outer peripheral end that extends from the outer peripheral surface 11 a of the amateur root portion 11 in the armature 3. This is a position through which a broken line 31 extending parallel to the coil axis 4a passes. The suction part 16 of the amateur 3 has an outer peripheral end that is the outer peripheral face 11 a of the amateur base 11, and an end on the coil shaft 4 a side (inner peripheral side) that extends from the inner peripheral face 9 a of the core opening end 9 in the core 2. This is a position through which a broken line 30 extending parallel to the coil axis 4a passes. In FIG. 1 to FIG. 4, the gap between the attracting portion 16 of the armature 3 and the attracting portion 15 of the core 2 is a magnetic gap G1, and the outer peripheral surface 12a of the armature extending portion 12 in the armature 3 and the core opening end portion in the core 2 9 shows an example in which the gap between the inner surface 9a and the inner peripheral surface 9 is a magnetic gap G2. The magnetic gap G1 is smaller than the magnetic gap G2. 1 and 2 show an example in which the magnetic gap G2 in the electromagnetic actuator 1 does not change between the first state and the second state, and the magnetic gap G1 in the first state changes to the magnetic gap G3 in the second state. It was.

  Although not shown, the link mechanism 24 may be provided with a return spring for returning the electromagnetic actuator 1 from the second state shown in FIG. 2 to the first state shown in FIG. Moreover, in this Embodiment, iron, cobalt, nickel etc. can be used as a magnetic material of the core 2 and the armature 3, and you may comprise as a laminated | stacked or integrated thing of a thin plate.

  The principle that the magnetic flux in the electromagnetic actuator 1 does not leak to the outside will be described. First, the operation of the electromagnetic actuator 1 will be described, in which the movable contact 22 and the fixed contact 23 of the current interrupting part 21 change from the open state where they are separated from each other to the closed state where the movable contact 22 and the fixed contact 23 are in contact with each other. When a current flows to the coil 4 of the electromagnetic actuator 1 in the first state shown in FIG. 1 toward the exposed end 5a of the shaft 5, a magnetic flux directed toward the exposed end 5a of the shaft 5 is generated inside the coil 4. Occur. As appropriate, the current flowing through the coil 4 is referred to as a coil current. The amateur 3 is driven by the magnetic flux so that the exposed end 5a of the shaft 5 is separated from the core 2. The magnetic flux generated by the coil 4 passes around the coil 4. There are two magnetic paths M1 and M2 as paths through which the magnetic flux passes through the armature 3 and the core 2 in the electromagnetic actuator 1 of the first embodiment. The magnetic path M1 is a magnetic path formed on the side close to the coil 4, and the magnetic path M2 is a magnetic path formed outside the magnetic path M1.

  In the example shown in FIGS. 1 to 4, since the magnetic gap G 1 is smaller than the magnetic gap G 2, the magnetic resistance of the magnetic path M 1 becomes smaller than the magnetic resistance of the magnetic path M 2, and the coil current flows through the coil 4. The magnetic flux concentrates and passes through the magnetic path M1 having a small magnetic resistance. Since the current value is small at the initial stage of energization when current begins to flow through the coil 4, the magnetic flux mainly passes through the magnetic path M1. Since the magnetic flux M passes through the magnetic path M1, the attracting portion 16 of the armature 3 and the attracting portion 15 of the core 2 are magnetized in the same direction along the direction of the magnetic flux, so the attracting portion 16 of the amateur 3 and the core 2 Are attracted to each other, and a suction force is generated between the suction portion 16 and the suction portion 15. The direction of the suction force by which the movable armature 3 is attracted to the core 2 is opposite to the direction in which the armature 3 is driven in the direction of the shaft 5. That is, a load force opposite to the driving force that drives the armature 3 in the direction of the shaft 5 is applied to the armature 3. The direction of the driving force by which the amateur 3 is driven in the direction of the shaft 5 is the direction from the amateur extending portion 12 of the amateur 3 to the exposed end portion 5a of the shaft 5, and is upward in FIGS. The direction of the load force applied to the amateur 3 is the direction from the suction part 16 of the amateur 3 to the suction part 15 of the core 2 and is downward in FIGS. 1 to 4.

  When the coil current increases, the magnetic flux generated by the coil 4 increases, and accordingly, the driving force for driving the armature 3 in the direction of the shaft 5 and the load force opposite to the driving force also increase. At this time, since the suction part width A1 of the suction part 16 and the suction part width A2 of the suction part 15 are smaller than the outer diameter of the armature extension part 12, when the suction parts 15 and 16 are magnetically saturated, the suction force is also saturated, and the driving force When the size of the armor exceeds the size of the suction force, the armature 3 moves in the direction in which the suction part 16 is separated from the suction part 15 of the core 2 and upward in the figure. When the amateur 3 moves and the magnetic gap between the suction part 15 and the suction part 16 increases, the attractive force between the suction part 15 and the suction part 16 decreases rapidly. In the case where the link mechanism 24 has a return spring, when the magnitude of the driving force exceeds the magnitude of the resultant force of the suction force and the attractive force of the return spring, the armature 3 has the suction portion 16 as the suction portion 15 of the core 2. Move away from, upward in the figure.

  Even if the magnetic flux M concentrates on the magnetic path M1 and the attracting portions 15 and 16 that apply load force are magnetically saturated, the magnetic flux passes through the magnetic path M2, and the driving force is continuously applied to the amateur 3. Therefore, similarly to the electromagnetic actuator of Patent Document 1, it is possible to operate the armature 3 from the first state to the second state after the coil current of the coil 4 has sufficiently increased, and the armature 3 can be driven with a large current. The driving force of amateur 3 can be increased and the driving characteristics can be improved.

  The operation of the electromagnetic actuator 1 will be described, in which the movable contact 22 and the fixed contact 23 of the current interrupting part 21 change from the closed state where they are in contact with each other to the open state where the movable contact 22 and the fixed contact 23 are separated from each other. For example, when a current flows to the left side of the coil 4 of the electromagnetic actuator 1 in the second state shown in FIG. 2 toward the exposed end portion 5 a of the shaft 5, the armature extends from the exposed end portion 5 a of the shaft 5 inside the coil 4. Magnetic flux toward the part 12 side is generated. The amateur 3 is driven by this magnetic flux so that the exposed end 5a of the shaft 5 approaches the core 2, and the electromagnetic actuator 1 returns to the first state shown in FIG. Further, as shown in FIGS. 1 and 2, when the armature 3 is driven in the direction opposite to the gravity, if the coil current of the coil 4 maintaining the second state is interrupted, the weight of the armature 3 (or the return spring and 1), the electromagnetic actuator 1 can be returned to the first state shown in FIG.

  In the electromagnetic actuator 1 according to the first embodiment, the suction portions 15 and 16 for applying a load force acting in a direction to cancel the driving force for driving the armature 3 in the direction in which the shaft 5 is sent between the core 2 and the armature 3 are provided. Unlike the electromagnetic actuator of Patent Document 1 in which the magnetic support plate corresponding to the attracting portion 15 is disposed outside the core because it is formed inside the core 2, the magnetic flux generated by the coil current is a magnetic path. The inside of the electromagnetic actuator 1 is reliably closed by M1 and the magnetic path M2. For this reason, the electromagnetic actuator 1 according to the first embodiment is configured such that the magnetic flux passing through the core 2 and the armature 3, that is, the magnetic flux passing through the magnetic paths M1 and M2, does not depend on the presence or absence of the surrounding magnetic body. Therefore, magnetic flux does not act. Therefore, the electromagnetic actuator 1 of the first embodiment is free from fluctuations in load force caused by leakage of magnetic flux generated by the coil current to the outside of the electromagnetic actuator 1, that is, the load force is constant, and the armature 3 is reliably set to a predetermined value. It is possible to move to the position. The electromagnetic actuator 1 according to the first embodiment can maintain a constant load force acting in a direction to cancel the driving force for driving the armature 3 in the direction in which the shaft 5 is delivered, and a large current after the coil current of the coil 4 has sufficiently increased. Thus, the amateur 3 can be driven, so that the operating characteristics of the amateur 3 are stabilized and the peripheral device is not damaged or malfunctioned.

  Further, in the electromagnetic actuator 1 according to the first embodiment, the suction portions 15 and 16 are not formed as separate parts but are formed as a part of the core 2 and the armature 3, so that integration errors such as assembly errors and dimensional errors are reduced. Therefore, the magnetic gap G1 of the attracting portions 15 and 16 and the area where the load force (attraction force) is generated are stable, and the operation variation of the electromagnetic actuator can be reduced. Further, since the electromagnetic actuator 1 according to the first embodiment does not require a separate part, the cost can be reduced and the size can be reduced by reducing the number of parts. Furthermore, the electromagnetic actuator 1 of Embodiment 1 adjusts the suction part width A1 of the suction part 16 of the armature 3 and the suction part width A2 of the suction part 15 of the core 2 shown in FIG. ) Can be easily changed, so that the load force can be freely adjusted without increasing the outer shape of the electromagnetic actuator 1. When reducing the suction part width A1 and the suction part width A2, for example, the outer diameter of the armature extension part 12 and the diameter of the opening 14 of the core opening end part 9 are increased, or the outer diameter of the amateur root part 11 is reduced. Good. Further, when the suction part width A1 and the suction part width A2 are increased, for example, the outer diameter of the armature extension part 12 and the diameter of the opening 14 of the core opening end part 9 are reduced, or the outer diameter of the amateur root part 11 is increased. do it.

  In the electromagnetic actuator 1 according to the first embodiment, the magnetic gap G1 is smaller than the magnetic gap G2. Therefore, as described above, the magnetic resistance of the magnetic path M1 is smaller than the magnetic resistance of the magnetic path M2, and the coil 4 is coiled. When a current flows, the magnetic flux concentrates and passes through the magnetic path M1 having a small magnetic resistance. When the magnetization of the armature 3 and the core 2 proceeds in the magnetic path M1 and the magnetic resistance of the magnetic path M1 increases, the magnetic flux passes from the magnetic path M1 to the magnetic path M2. Even when a deviation such as dimensional tolerance or installation error occurs in one or both of the amateur 3 and the core 2, it is possible to reliably pass the magnetic flux preferentially over the magnetic path M1 where the small magnetic gap G1 exists. The initial load force in the direction opposite to the driving direction in which the shaft 3 is driven in the direction in which the shaft 5 is delivered can be stabilized, and the operation variation of the amateur 3 can be reduced. Furthermore, the electromagnetic actuator 1 according to the first embodiment can change the magnetic resistance of the magnetic path M1 and the magnetic path M2 even by adjusting the magnetic gap G1 and the magnetic gap G2, so that the outer shape of the electromagnetic actuator 1 is not increased. The initial load force can be adjusted freely.

  The electromagnetic actuator 1 according to the first embodiment forms at least one magnetic path, that is, one magnetic path M2 outside the magnetic path M1 passing through the attracting portion 16 of the armature 3 and the attracting portion 15 of the core 2. Therefore, it is possible to stabilize the initial load force in the opposite direction to the driving force that the armature 3 is driven in the direction of the shaft 5 regardless of the presence or absence of the surrounding magnetic material, and it is possible to cause failure or malfunction of the peripheral device. In addition to being able to prevent this, the cost can be reduced and the size can be reduced by reducing the number of parts.

  Here, although the electromagnetic actuator 1 has shown the example in which the suction part 15 of the core 2 and the suction part 16 of the amateur 3 are not in contact in the first state, the suction part 15 of the core 2 and the suction of the amateur 3 are shown. The same effect can be obtained also when the part 16 is in contact. Moreover, although the magnetic gap of the magnetic path M2 has been described as an example, it is not essential that the magnetic gap of the magnetic path M2 is constant. For example, the magnetic gap of the magnetic path M2 may be reduced as the amateur 3 moves.

  As described above, the electromagnetic actuator 1 according to the first embodiment is an electromagnetic actuator that drives the magnetic armature 3 movably disposed inside the coil 4 with the magnetic flux generated by the coil 4. The electromagnetic actuator 1 according to the first embodiment is provided with a coil 4, a root part (amateur root part 11), a base part (amateur root part 11) extending from the root part (amateur root part 11) in the direction of the coil shaft 4 a and a root part. An armature 3 having a stretched portion (amateur stretched portion 12) having an outer diameter smaller than that of the (amateur root portion 11), and a magnet that is disposed outside the coil 4 and through which the magnetic flux generated by the coil 4 along with the armature 3 passes. And a magnetic core 2 that forms a path. The armature 3 of the electromagnetic actuator 1 according to the first embodiment includes a circumferentially extending portion 11b that extends in the circumferential direction perpendicular to the coil shaft 4a from the outer periphery of the extending portion (the amateur extending portion 12). The suction portion 15 is provided on the inner side of the core 3 so as to generate an attractive force between the circumferential extension portion 11b and the circumferential extension portion 11b when the magnetic flux passes. 15 has an armature facing portion (inner peripheral surface 9a) that forms a second magnetic path M2 that faces the armature 3 and passes the magnetic flux outside the first magnetic path M1 through which the flux passes. To do. The electromagnetic actuator 1 according to the first embodiment includes a first magnetic path M1 through which a magnetic flux passes through an attractive portion 15 provided inside the core 2, and an armature 3 that faces the armature 3 outside the first magnetic path M1. The second magnetic path M2 through which the armature passes is formed, so that a stable initial load force can be applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1.

  The switching device 50 according to the first embodiment is configured to connect the current interrupting unit 21 having the movable contact 22 and the fixed contact 23 therein, and the movable contact 22 of the current interrupting unit 21 to the fixed contact 23 via the link mechanism 24. The electromagnetic actuator 1 to be moved is provided. The electromagnetic actuator 1 is provided to extend from the coil 4, the root portion (amateur root portion 11), the root portion (amateur root portion 11) to the coil axis 4 a of the coil 4, and the root portion (amateur root portion 11). The armature 3 having a stretched portion (amateur stretched portion 12) having a smaller outer diameter than the armature 3) and a magnetism that forms a magnetic path through which the magnetic flux generated by the coil 4 passes with the armature 3. A core 2 of the body. The armature 3 of the electromagnetic actuator 1 has a circumferentially extending portion 11b that extends in the circumferential direction perpendicular to the coil shaft 4a from the outer periphery of the extending portion (the amateur extending portion 12), and the core 3 is a circumferentially extending portion of the amateur 3 The suction portion 15 is provided on the inner side of the core 3 so as to generate a suction force with respect to the circumferential extension portion 11b when the magnetic flux passes and the magnetic flux passes through the suction portion 15. The armature facing part (inner peripheral surface 9a) which forms the 2nd magnetic path M2 which opposes the armature 3 and the magnetic flux passes outside of the 1st magnetic path M1 to perform is characterized by the above-mentioned. The opening / closing device 50 according to the first embodiment includes a first magnetic path M1 through which the magnetic flux passes through the attracting portion 15 provided inside the core 2, and the magnetic flux that faces the armature 3 outside the first magnetic path M1. Since the electromagnetic actuator 1 that forms the second magnetic path M2 through which the armature passes is provided, a stable initial load force is applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1. Thus, the closing operation for closing the current interrupting portion 21 can be reliably performed.

Embodiment 2. FIG.
FIG. 5 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 2 of the present invention, and FIG. 6 is a schematic cross-sectional view showing the main part of the electromagnetic actuator of FIG. FIG. 7 is a schematic cross-sectional view of another electromagnetic actuator according to Embodiment 2 of the present invention, and FIG. 8 is a schematic cross-sectional view showing a main part of the electromagnetic actuator of FIG. FIG. 9 is a diagram illustrating an example of the applying force of the electromagnetic actuator according to the second embodiment of the present invention. 5 to 8 show the configuration of the electromagnetic actuator 1 in the first state. FIG. 9 compares the applying force of the electromagnetic actuator 1 of the first embodiment and the applying force of the electromagnetic actuator 1 of the first embodiment when the initial load force is the same. In the electromagnetic actuator 1 according to the second embodiment, at least one of the core 2 or the armature 3 is formed in a protruding shape in the attracting portions 15 and 16, and the magnetic flux passing area S1 through which the magnetic flux passes through the attracting portions 15 and 16 is defined as the magnetic path M1. In this example, the magnetic path M2 provided outside is smaller than the magnetic flux passage area S2 through which the magnetic flux passes between the core 2 and the armature 3.

  The electromagnetic actuator 1 shown in FIGS. 5 and 6 is an example in which a protruding portion 9 c that protrudes toward the suction portion 16 is provided on the inner side surface 9 b of the core opening end portion 9. The electromagnetic actuator 1 shown in FIGS. 7 and 8 is an example in which a protrusion 11 c that protrudes toward the suction portion 15 is provided on the circumferential extension portion 11 b of the amateur base portion 11.

The magnitude of the initial load force in the direction opposite to the driving direction in which the amateur 3 is driven in the direction of the shaft 5 is the product of the square of the magnetic flux density B of the suction portions 15 and 16 and the magnetic flux passage area S of the suction portions 15 and 16. It is proportional to B ² S. Here, as will be described later, even if the magnetic flux passage area S is reduced, the absolute value of the magnitude of the initial load force may be made equal, so the characteristics of the applied force applied to the amateur 3 in FIG. An example in which the initial load force is equivalent is shown. In FIG. 9, the vertical axis represents the coil current or the applied force applied to the amateur 3, and the horizontal axis represents time. A characteristic 32 is a coil current characteristic. Characteristics 33 and 34 are the imparting force characteristic in the first embodiment and the imparting force characteristic in the second embodiment, respectively.

  The maximum value of the initial load force is when the magnetic flux flows only in the magnetic flux M1. If the coil currents flowing in the coil 4 are the same, the intensity of the magnetic flux generated by the coil 4 is also the same. Therefore, when the suction part width A4 of the second embodiment is smaller than the suction part width A2 of the first embodiment, The magnetic flux passing area S1 through which the magnetic flux passes through the magnetic path M1, that is, the attracting portions 15 and 16, is reduced, and the magnetic flux density B passing through the attracting portions 15 and 16 is increased. Therefore, when the coil currents flowing through the coil 4 are the same, even if the magnetic flux M1, that is, the magnetic flux passage area S1 passing through the suction portions 15 and 16 is reduced, the suction portions 15 and 16 having a large magnetic flux passage area An equivalent initial load force can be obtained.

In the second embodiment, the magnetic flux M1, that is, the magnetic flux passage area S1 that passes through the attracting portions 15 and 16 is decreased and the magnetic flux density B is increased, so that the coil current is the same as in the first embodiment. An initial load force equivalent to that of the electromagnetic actuator 1 is generated. For this reason, in the electromagnetic actuator 1 of the second embodiment, the rate of decrease of the magnetic flux density B accompanying the increase in the magnetic gap of the attracting portions 15 and 16 after the movement of the armature 3 is lower than that of the electromagnetic actuator 1 of the first embodiment. growing. Therefore, compared with the first embodiment, the electromagnetic actuator 1 according to the second embodiment has a larger reduction rate of the product B ² S in the initial load force, and the applied force applied to the amateur 3 as shown in FIG. The increase rate of the driving force, which is a positive force, can be increased, and the driving characteristics can be improved. It should be noted that the applied force when the applied force applied to the amateur 3 is negative is a load force opposite to the driving force.

  In order to decrease the magnetic flux passage area S1 through which the magnetic flux passes through the magnetic path M1, that is, the attracting portions 15 and 16 and increase the magnetic flux density B, the attracting portion widths A3 and A4 may be reduced. It is not necessary to provide the protruding portion 9c protruding to the suction portion 16 side on the inner side surface 9b of 9 or the protruding portion 11c protruding to the suction portion 15 side on the circumferential extension portion 11b of the amateur root portion 11. . However, by providing the protrusion 9c and the protrusion 11c, the magnetic flux M1 passes through the magnetic path M1, that is, the magnetic flux passage area S1 through which the magnetic flux M passes through the magnetic path M2. Can be easily done. The magnetic flux passing through the magnetic path M2 is reduced by reducing the magnetic flux passing area S1 through which the magnetic flux passes through the magnetic path M1, that is, the attracting portions 15 and 16, to the magnetic flux passing area S2 through which the magnetic flux passes through the magnetic path M2. As shown in the imparting force characteristic 34 of FIG.

  In the example of FIGS. 5 and 6, as shown in FIG. 6, the magnetic flux passage area S <b> 2 that passes through the magnetic path M <b> 2 is equal to the inner peripheral surface width B <b> 1 that is the width of the inner peripheral surface 9 a of the core opening end portion 9. It is the product of the peripheral length of the peripheral surface 9a. On the other hand, when the suction part width A4, which is the circumferential width of the suction part 15 of the core opening end 9, is the same as the suction part width A2 of the electromagnetic actuator 1 of the first embodiment, the magnetic path M1 is changed. The passing magnetic flux passage area S1 is the same as that of the electromagnetic actuator 1 of the first embodiment. Thus, by providing the inner surface 9b of the core opening end 9 with the protrusion 9c protruding toward the suction portion 16, the magnetic flux passing area S1 through which the magnetic flux passes through the magnetic path M1, that is, the suction portions 15, 16 is provided. Can be made smaller than the magnetic flux passage area S2 through which the magnetic flux passes through the magnetic path M2.

  In the example of FIGS. 7 and 8, as shown in FIG. 8, the magnetic flux passage area S2 passing through the magnetic path M2 is equal to the end inner peripheral surface width B1 which is the width of the inner peripheral surface 9a of the core opening end portion 9. It is the product of the peripheral length of the peripheral surface 9a. The magnetic flux passage area S2 passing through the magnetic path M2 is the same as the electromagnetic actuator 1 of the first embodiment in the electromagnetic actuator 1 of the second embodiment when the end inner peripheral surface width B1 is the same. On the other hand, the suction portion width A3, which is the width in the circumferential direction of the suction portion 16 of the circumferential extension portion 11b in the amateur root portion 11, is provided with the projection portion 11c, so that the armature root portion 11 having the same diameter is provided. It becomes smaller than the attraction | suction part width | variety A2 of the electromagnetic actuator 1 of the form 1. Therefore, the magnetic flux passage area S1 passing through the magnetic path M1 is smaller in the electromagnetic actuator 1 of the second embodiment than in the electromagnetic actuator 1 of the first embodiment. Thus, by providing the protrusion 11c protruding toward the attracting portion 15 on the circumferentially extending portion 11b of the amateur root portion 11, the magnetic flux passage area through which the magnetic flux passes through the magnetic path M1, that is, the attracting portions 15 and 16 is provided. S1 can be made smaller than the magnetic flux passage area S2 where the magnetic flux passes through the magnetic path M2.

  Also in the second embodiment, since at least one magnetic path M2 is formed outside the magnetic path M1 passing through the attracting portions 15 and 16, the same effect as in the first embodiment can be obtained. A stable initial load force can be applied to the armature 3 when the shaft 5 is delivered without leaking the magnetic flux outside the electromagnetic actuator 1. Moreover, since the electromagnetic actuator 1 of Embodiment 2 has at least one or more magnetic paths M2 formed outside the magnetic path M1 passing through the attracting portions 15 and 16, it does not depend on the presence or absence of a surrounding magnetic body. It is possible to stabilize the initial load force that is opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and it is possible to prevent peripheral devices from malfunctioning or malfunctioning, and to reduce the cost by reducing the number of parts. Miniaturization is possible. Furthermore, as described with reference to FIG. 4 of the first embodiment, by making the magnetic gap G1 smaller than the magnetic gap G2, it is possible to reduce the operational variation of the armature 3 due to dimensional tolerances and installation errors, and to reduce the magnetic gap G1 and the magnetic gap. By adjusting G2, the initial load force can be easily adjusted without increasing the size of the electromagnetic actuator 1.

Embodiment 3 FIG.
FIG. 10 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 3 of the present invention, and FIG. 11 is a schematic cross-sectional view showing the main part of the electromagnetic actuator of FIG. 10 and 11 show the configuration of the electromagnetic actuator 1 in the first state. In the electromagnetic actuator 1 according to the third embodiment, the armature 3 or the projections of the core 2 (projection 9c, projection 11c) are integrated with a tolerance L1 so that the suction part widths A1 and A2 of the suction parts 15 and 16 are constant. The above is an example of moving the outer side in the circumferential direction. As a result, the electromagnetic actuator 1 according to the third embodiment can keep the suction section widths A1 and A2 constant even if the armature 3 is displaced in the horizontal direction in FIGS. 10 and 11 due to installation errors and dimensional tolerances. Therefore, it becomes possible to keep constant the initial load force in the direction opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and the operation variation of the armature 3 can be reduced.

  The electromagnetic actuator 1 shown in FIGS. 10 and 11 is an example in which a protruding portion 11 c that protrudes toward the suction portion 15 is provided on the circumferential extension portion 11 b of the amateur root portion 11. Although not shown in the figure, even when the inner surface 9b of the core opening end portion 9 is provided with a protrusion 9c protruding toward the suction portion 16, the end on the inner peripheral side of the suction portion 15 is the core opening end. What is necessary is just to move to the outer side of the circumferential direction from the internal peripheral surface 9a of the part 9. FIG. By doing in this way, also when the projection part 9c which protruded in the suction part 16 side is provided in the inner surface 9b of the core opening end part 9, it is the same as that of the electromagnetic actuator 1 shown in FIG.10 and FIG.11. The armature 3 is driven in the direction of the shaft 5 because the suction section widths A1 and A2 can be kept constant even if the armature 3 is displaced in the horizontal direction of the paper in FIGS. Therefore, it is possible to keep the initial load force in the opposite direction to the driving force to be constant, and to reduce the operation variation of the amateur 3.

  Also in the third embodiment, since at least one magnetic path M2 is formed outside the magnetic path M1 passing through the attracting portions 15 and 16, the same effect as in the first embodiment can be obtained. A stable initial load force can be applied to the armature 3 when the shaft 5 is delivered without leaking the magnetic flux outside the electromagnetic actuator 1. Moreover, since the electromagnetic actuator 1 of Embodiment 3 has at least one or more magnetic paths M2 formed outside the magnetic path M1 passing through the attracting portions 15 and 16, it does not depend on the presence or absence of a surrounding magnetic body. It is possible to stabilize the initial load force that is opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and it is possible to prevent peripheral devices from malfunctioning or malfunctioning, and to reduce the cost by reducing the number of parts. Miniaturization is possible. Furthermore, as described with reference to FIG. 4 of the first embodiment, by making the magnetic gap G1 smaller than the magnetic gap G2, it is possible to reduce the operational variation of the armature 3 due to dimensional tolerances and installation errors, and to reduce the magnetic gap G1 and the magnetic gap. By adjusting G2, the initial load force can be easily adjusted without increasing the size of the electromagnetic actuator 1.

Embodiment 4 FIG.
FIG. 12 is a schematic sectional view of an electromagnetic actuator according to Embodiment 4 of the present invention, and FIG. 13 is a schematic sectional view of another electromagnetic actuator according to Embodiment 4 of the present invention. 12 and 13 show the configuration of the electromagnetic actuator 1 in the first state. The electromagnetic actuator 1 according to the fourth embodiment is an example in which a nonmagnetic material 6 a is disposed between the suction part 15 and the suction part 16. The nonmagnetic material 6 a is fixed to the suction part 15 or the suction part 16. 12 and 13, in the first state, the nonmagnetic material 6 a is disposed between the circumferentially extending portion 11 b of the armature 3 and the inner side surface 9 b of the core opening end portion 9 in the core 2. . In the first state, the electromagnetic actuator 1 of FIGS. 12 and 13 has a nonmagnetic material 6a inserted between the circumferentially extending portion 11b of the armature 3 and the inner surface 9b of the core opening end portion 9 of the core 2. It becomes possible to keep the magnetic gap between the circumferentially expanded portion 11b of the amateur 3 and the inner side surface 9b of the core opening end 9 in the core 2, that is, the magnetic gap between the attracting portion 15 and the attracting portion 16. Can be kept constant. The electromagnetic actuator 1 of FIGS. 12 and 13 keeps the armature 3 in the direction in which the shaft 5 is sent out, because the nonmagnetic material 6a keeps the magnetic gap between the suction part 15 and the suction part 16 in the first state constant. The initial load force in the direction opposite to the driving force to be driven can be kept constant, and the operation variation of the amateur 3, that is, the variation of the initial load force can be reduced.

  Further, as shown in FIG. 13, a magnetic gap different from the magnetic gap between the attracting portion 15 and the attracting portion 16, that is, the inner peripheral surface 9 a of the core opening end 9 in the core 2 and the outer peripheral surface of the amateur extending portion 12 in the amateur 3. By adding the nonmagnetic material 6b to the magnetic gap between the armature 12a and the armature 3a, the rotation of the armature 3 and the central axis of the armature 3 are removed from the coil shaft 4a. Therefore, the armature 3 can be operated more stably.

  Also in the fourth embodiment, since at least one magnetic path M2 is formed outside the magnetic path M1 passing through the attracting portions 15 and 16, the same effect as in the first embodiment can be obtained. A stable initial load force can be applied to the armature 3 when the shaft 5 is delivered without leaking the magnetic flux outside the electromagnetic actuator 1. Moreover, since the electromagnetic actuator 1 of Embodiment 4 has at least one or more magnetic paths M2 formed outside the magnetic path M1 passing through the attracting portions 15 and 16, it does not depend on the presence or absence of a surrounding magnetic body. It is possible to stabilize the initial load force that is opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and it is possible to prevent peripheral devices from malfunctioning or malfunctioning, and to reduce the cost by reducing the number of parts. Miniaturization is possible. Furthermore, as described with reference to FIG. 4 of the first embodiment, by making the magnetic gap G1 smaller than the magnetic gap G2, it is possible to reduce the operational variation of the armature 3 due to dimensional tolerances and installation errors, and to reduce the magnetic gap G1 and the magnetic gap. By adjusting G2, the initial load force can be easily adjusted without increasing the size of the electromagnetic actuator 1.

Embodiment 5. FIG.
FIG. 14 is a schematic sectional view of an electromagnetic actuator according to Embodiment 5 of the present invention, and FIG. 15 is a schematic sectional view of another electromagnetic actuator according to Embodiment 5 of the present invention. 14 and 15 show the configuration of the electromagnetic actuator 1 in the first state. The electromagnetic actuator 1 according to the fifth embodiment is an example in which opposing surfaces of the suction portions 15 and 16 facing each other are arranged at an angle with respect to the driving direction of the armature 3, that is, the coil shaft 4a. Opposing surfaces of the suction portions 15 and 16 facing each other are inclined with respect to the coil shaft 4a. 14 and 15 show an example in which the opposing surfaces of the suction portions 15 and 16 facing each other are inclined at the same angle with respect to the coil shaft 4a. FIG. 14 shows an example in which the opposing surfaces of the suction portions 15 and 16 are inclined so as to advance toward the shaft 5 as they approach the coil shaft 4a. FIG. 15 shows an example in which the opposing surfaces of the suction portions 15 and 16 are inclined so as to advance toward the opposite side of the shaft 5, that is, toward the armature extension portion 12 side and the opening 14 side as approaching the coil shaft 4 a. When the amateur 3 returns from the second state shown in FIG. 2 to the first state shown in FIG. 1, the amateur 3 is accelerated by its own weight (or the resultant force with the return spring), and a large speed is generated. As a result, the armature 3 repeatedly collides and repels between the suction portion 16 provided on the armature 3 and the suction portion 15 of the core 2, and stops in the first state shown in FIG. Thereby, a large impact is applied several times to the suction part 16 of the amateur 3 and the suction part 15 of the core 2, causing deformation of the suction parts 15 and 16.

  In the fifth embodiment, the suction portions 15 and 16 are arranged at an angle with respect to a plane (horizontal plane) perpendicular to the coil axis 4a, and thus are generated in the suction portions 15 and 16 when returning to the first state. The direction in which the impact is applied can be dispersed in directions other than the direction of the coil shaft 4a, that is, in the direction parallel to the opposing surfaces of the suction portions 15 and 16, and the number of collisions and repulsions can be reduced. The number of times the impact is applied is reduced, and the period (deformation life) until the deformation of the suction portions 15 and 16 exceeds the allowable range can be extended. For this reason, since the electromagnetic actuator 1 according to the fifth embodiment can extend the deformation life of the suction portions 15 and 16, the variation of the initial load force in the direction opposite to the driving direction due to the deformation of the suction portions 15 and 16 is suppressed. It is possible to reduce the operational variation of the amateur 3, and to prolong the product life.

  When the coil 4 is not energized and the coil 4 is not energized, the armature 3 has a load force opposite to the driving direction in which the armature 3 is driven in the direction of the shaft 5 due to the weight of the armature 3 (or the resultant force with the return spring). In addition, the suction part 15 and the suction part 16 come into contact with each other. In the electromagnetic actuator 1 according to the fifth embodiment, the suction portions 15 and 16 are arranged at an angle with respect to the horizontal plane. Therefore, even when the coil is not energized, the weight of the amateur 3 (or the resultant force of the return spring) As a result, the suction part 16 of the armature 3 contacts along the inclination of the suction part 15 of the opposing core 2, so that the central axis of the armature 3 is displaced in the circumferential direction (left and right direction on the paper surface) from the coil shaft 4a. Can be prevented. The electromagnetic actuator 1 is arranged so that the central axis of the armature 3 and the coil axis 4a coincide with each other through the through-hole of the core 2. However, when the core 2 and the armature 3 come into contact with each other when the coil is not energized, When the center axis and the coil axis 4a are shifted, a force in a direction perpendicular to the coil axis 4a acts on the through hole of the core 2. If the cumulative period during which this force is applied becomes longer due to the operation of the electromagnetic actuator 1, the through hole may be distorted. However, the electromagnetic actuator 1 according to the fifth embodiment can prevent the center axis of the armature 3 from being displaced in the circumferential direction (left and right direction on the paper surface) from the coil shaft 4a even when the coil is not energized. The distortion of the hole can be prevented, the variation in the initial load force opposite to the driving direction in which the armature 3 is driven in the direction of the shaft 5 can be reduced, and the operation variation of the armature 3 can be reduced.

  Also in the fifth embodiment, since at least one magnetic path M2 is formed outside the magnetic path M1 passing through the attracting portions 15 and 16, the same effect as in the first embodiment can be obtained. A stable initial load force can be applied to the armature 3 when the shaft 5 is delivered without leaking the magnetic flux outside the electromagnetic actuator 1. Further, in the electromagnetic actuator 1 according to the fifth embodiment, at least one or more magnetic paths M2 are formed outside the magnetic path M1 that passes through the attracting portions 15 and 16, and therefore, regardless of the presence or absence of the surrounding magnetic material. It is possible to stabilize the initial load force that is opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and it is possible to prevent peripheral devices from malfunctioning or malfunctioning, and to reduce the cost by reducing the number of parts. Miniaturization is possible. Furthermore, as described with reference to FIG. 4 of the first embodiment, by making the magnetic gap G1 smaller than the magnetic gap G2, it is possible to reduce the operational variation of the armature 3 due to dimensional tolerances and installation errors, and to reduce the magnetic gap G1 and the magnetic gap. By adjusting G2, the initial load force can be easily adjusted without increasing the size of the electromagnetic actuator 1.

Embodiment 6 FIG.
FIG. 16 is a schematic cross-sectional view of an electromagnetic actuator according to Embodiment 6 of the present invention, and FIG. 17 is a diagram showing an example of coil current of the electromagnetic actuator according to Embodiment 6 of the present invention. FIG. 16 shows the configuration of the electromagnetic actuator 1 in the first state. In FIG. 17, the coil current of the electromagnetic actuator 1 in Embodiment 1 is also shown for comparison. The electromagnetic actuator 1 according to the sixth embodiment is an example in which opposing surfaces of the suction portions 15 and 16 facing each other are provided on the coil driving direction side, that is, on the shaft 5 side. The core 2 according to the sixth embodiment includes a core extension portion 10 provided to extend toward the coil shaft 4 a side on the core lid portion 8 side of the core body portion 7. A part of the circumferentially extending portion 11 b in the amateur root portion 11 faces a portion of the shaft direction surface 10 a that is a surface on the shaft 5 side in the core extension portion 10 of the core 2. The portions where the circumferentially extending portion 11 b and the shaft direction surface 10 a of the core extending portion 10 face each other are suction portions 15 and 16. That is, the suction part 15 of the core extension part 10 in the core 2 and the suction part 16 of the circumferential extension part 11b in the armature 3 face each other. The inner side surface 8a of the core lid portion 8 is an amateur facing portion that forms a magnetic path M2 that faces the armature 3 and through which the magnetic flux generated by the coil 4 passes.

  The suction portion 15 of the core 2 has a coil shaft 4 a side (inner peripheral side) end that is the inner peripheral surface 10 b of the core extension 10, and an outer peripheral end that is coiled from the outer peripheral surface 11 a of the amateur root portion 11 in the armature 3. This is a position through which a broken line 31 extending parallel to the axis 4a passes. The suction portion 16 of the amateur 3 has an outer peripheral end that is the outer peripheral surface 11a of the amateur base 11, and a coil shaft 4a side (inner peripheral side) end that is coiled from the inner peripheral surface 10b of the core extension 10 in the core 2. This is a position through which a broken line 30 extending parallel to the axis 4a passes. In FIG. 16, the gap between the attraction portion 16 of the armature 3 and the attraction portion 15 of the core 2 is a magnetic gap G1, and the outer peripheral surface 12a of the armature extension portion 12 in the armature 3 and the core opening end portion 9 in the core 2 The gap with the peripheral surface 9a is the magnetic gap G2, and the gap between the shaft direction surface 11d which is the surface on the shaft 5 side of the armature root portion 11 of the armature 3 and the inner surface 8a of the core lid portion 8 in the core 2 is the magnetic gap. An example of G4 is shown. The magnetic gap G1 is smaller than the magnetic gap G2 and the magnetic gap G4. In FIG. 16, the magnetic gap G2 in the electromagnetic actuator 1 does not change between the first state and the second state, the magnetic gap G1 in the first state increases in the second state, and the magnetic gap G4 in the first state becomes the first. An example of decrease in two states is shown.

  As shown in FIG. 16, the magnetic flux generated by the coil 4 passes around the coil 4. In the electromagnetic actuator 1 of the sixth embodiment, there are two magnetic paths M3 and M2 as paths through which the magnetic flux passes through the armature 3 and the core 2, that is, magnetic paths. The magnetic path M3 is a magnetic path formed on the side close to the coil 4, and the magnetic path M2 is a magnetic path formed outside the magnetic path M3. The magnetic flux generated by the coil 4 passes through a magnetic path M3 that passes through the attracting portions 15 and 16 provided on the driving direction side and a magnetic path M2 that does not pass through the attracting portions 15 and 16.

  In the electromagnetic actuator 1 according to the sixth embodiment, since the magnetic flux passes through the magnetic gap G2 in both the magnetic path M3 and the magnetic path M2, as shown in FIG. 17, the value of the coil current supplied to the coil 4 is increased. There is a need. The vertical axis in FIG. 17 is the coil current, and the horizontal axis is the stroke that is the length that the armature 3 moves. A characteristic 37 is a coil current characteristic in the electromagnetic actuator 1 of the sixth embodiment, and a characteristic 36 is a coil current characteristic in the electromagnetic actuator 1 of the first embodiment. P1 is a stroke corresponding to the initial position of the amateur 3 in the first state, and P2 is a stroke corresponding to the position of the amateur 3 in the second state.

  Since the magnetic gap G1 is smaller than the magnetic gap G4, the magnetic resistance of the magnetic path M3 is smaller than the magnetic resistance of the magnetic path M2, and when a coil current flows through the coil 4, the magnetic flux passes through the magnetic path M3 having a small magnetic resistance. You will pass in a concentrated manner. Since the current value is small at the initial stage of energization when current begins to flow through the coil 4, the magnetic flux mainly passes through the magnetic path M3. Since the magnetic flux M passes through the magnetic path M3, the attracting portion 16 of the amateur 3 and the attracting portion 15 of the core 2 are both magnetized in the same direction along the direction of the magnetic flux. Are attracted to each other, and a suction force is generated between the suction portion 16 and the suction portion 15. The direction of the suction force by which the movable armature 3 is attracted to the core 2 is opposite to the direction in which the armature 3 is driven in the direction of the shaft 5. That is, a load force opposite to the driving force that drives the armature 3 in the direction of the shaft 5 is applied to the armature 3. The direction of the driving force by which the amateur 3 is driven in the direction of the shaft 5 is the direction from the amateur extending portion 12 of the amateur 3 to the exposed end portion 5a of the shaft 5, and is upward in FIG. The direction of the load force applied to the amateur 3 is the direction from the suction part 16 of the amateur 3 to the suction part 15 of the core 2, and is downward in FIG.

  When the coil current increases, the magnetic flux generated by the coil 4 increases, and accordingly, the driving force for driving the armature 3 in the direction of the shaft 5 and the load force opposite to the driving force also increase. At this time, since the suction part width of the suction parts 16 and 15 is smaller than the outer diameter of the armature extension part 12, when the suction parts 15 and 16 are magnetically saturated, the suction force is saturated, and the magnitude of the driving force is the magnitude of the suction force. Beyond that, the armature 3 moves upward in the direction in which the suction part 16 moves away from the suction part 15 of the core 2. When the amateur 3 moves and the magnetic gap between the suction part 15 and the suction part 16 increases, the attractive force between the suction part 15 and the suction part 16 decreases rapidly. In the case where the link mechanism 24 has a return spring, when the magnitude of the driving force exceeds the magnitude of the resultant force of the suction force and the attractive force of the return spring, the armature 3 has the suction portion 16 as the suction portion 15 of the core 2. Move away from, upward in the figure.

  As in the electromagnetic actuator 1 of the first embodiment, the electromagnetic actuator 1 of the sixth embodiment has magnetic attraction portions 15 and 16 that apply a load force by concentrating magnetic flux on the magnetic path M3 formed near the coil 4. Even if it is saturated, the magnetic flux passes through the magnetic path M2, and the driving force is continuously applied to the amateur 3. Therefore, similarly to the electromagnetic actuator 1 of the first embodiment, the electromagnetic actuator 1 of the sixth embodiment can operate the armature 3 from the first state to the second state after the coil current of the coil 4 has sufficiently increased. Thus, the armature 3 can be driven with a large current, that is, the driving force of the armature 3 can be increased and the driving characteristics can be improved.

  Further, in the electromagnetic actuator 1 according to the sixth embodiment, the magnetic gap G1 between the suction portion 16 and the suction portion 15 is made smaller than the magnetic gap between the suction portion 16 and the suction portion 15 in the first embodiment. Thus, magnetic resistance of the magnetic path M3 is smaller than that of the magnetic path M1 in the first embodiment, and the magnetic flux passes through the armature 3, that is, the armature extending portion 12 and the armature root portion 11, as compared with the electromagnetic actuator 1 of the first embodiment. Will increase. Since the reverse voltage of the coil 4 with respect to the power supply voltage is proportional to the time change of the magnetic flux passing through the armature 3, the armature 3 is more magnetized at the initial position (first state position) as shown in FIG. This can reduce the reverse voltage of the coil 4 and prevent the coil current from decreasing. The electromagnetic actuator 1 of the sixth embodiment can increase the driving force for driving the armature 3 in the direction in which the shaft 5 is sent out by reducing the magnetic gap G1 between the attraction unit 16 and the attraction unit 15. The driving characteristics of the amateur 3 can be improved. In the electromagnetic actuator 1 shown in the other embodiments, the driving force for driving the armature 3 in the direction in which the shaft 5 is sent out by reducing the magnetic gap G1 between the attraction unit 16 and the attraction unit 15. The driving characteristics of the amateur 3 can be improved.

  Also in the sixth embodiment, since at least one magnetic path M2 is formed outside the magnetic path M3 passing through the attracting portions 15 and 16, the same effect as in the first embodiment is obtained. A stable initial load force can be applied to the armature 3 when the shaft 5 is delivered without leaking the magnetic flux outside the electromagnetic actuator 1. Further, in the electromagnetic actuator 1 according to the sixth embodiment, since at least one magnetic path M2 is formed outside the magnetic path M3 passing through the attracting portions 15 and 16, regardless of the presence or absence of a surrounding magnetic body. It is possible to stabilize the initial load force that is opposite to the driving force in which the armature 3 is driven in the direction of the shaft 5, and it is possible to prevent peripheral devices from malfunctioning or malfunctioning, and to reduce the cost by reducing the number of parts. Miniaturization is possible. Further, by making the magnetic gap G1 smaller than the magnetic gap G2 and the magnetic gap G4, as described with reference to FIG. 4 of the first embodiment, it is possible to reduce variation in operation due to dimensional tolerances and installation errors and to reduce the magnetic gap G1. By adjusting the magnetic gap G2 and the magnetic gap G4, the initial load force can be easily adjusted without increasing the size of the electromagnetic actuator 1.

  Here, although the electromagnetic actuator 1 has shown the example in which the suction part 15 of the core 2 and the suction part 16 of the amateur 3 are not in contact in the first state, the suction part 15 of the core 2 and the suction of the amateur 3 are shown. The same effect can be obtained also when the part 16 is in contact. Moreover, although the magnetic gap of the magnetic path M2 has been described as an example, it is not essential that the magnetic gap of the magnetic path M2 is constant. For example, the magnetic gap of the magnetic path M2 may be reduced as the amateur 3 moves.

Embodiment 7 FIG.
18 and 19 are diagrams showing an electromagnetic actuator and a switching device according to the seventh embodiment. FIG. 18 shows a first state and an open state (OFF state) of the electromagnetic actuator, and FIG. 19 shows a second state and a closed state (ON state) of the electromagnetic actuator. FIG. 20 is a partial view of the first electromagnetic actuator according to the seventh embodiment of the present invention. FIG. 21 is a partial view of the core and amateur of FIG. 20, and FIG. 22 is a view of the cushioning material of FIG. FIG. 20 is a view showing a part of the core 2 and the amateur 3 in the middle of the opening. In the electromagnetic actuator 1 according to the seventh embodiment, at least a portion of the suction portion 16 of the circumferential extension portion 11b in the armature 3 and the suction portion 15 of the core 2 are connected to the suction portion 15 of the core 2 to which the opening impact is applied. A cushioning material 41 shown in FIG. 22 is disposed so as to be interposed therebetween, and an opening impact is applied to the cushioning material. As described in the fourth embodiment, the opening impact is caused when the armature 3 and the core 2 collide when the electromagnetic actuator 1 returns from the second state (see FIG. 19) to the first state (see FIG. 18). It is an impact caused by. 20 and 21, a recess for arranging the buffer material 41 is formed in the suction portion 15 of the core 2. Since the portion of the core 2 facing the circumferentially extending portion 11 b in the amateur 3 is the suction portion 15, the portion on the coil shaft 4 a side of the cushioning material 41 is between the suction portion 16 of the amateur 3 and the suction portion 15 of the core 2. It is a part of the buffer material 41 arrange | positioned so that it may interpose. 18 and 19, cross-sectional views of the electromagnetic actuator 1 and the current interrupting unit 21 are shown, but hatching is omitted in the cross-section so as not to make it difficult to see the lead lines and the like. Further, in FIGS. 18 and 19, an outer peripheral line (peripheral line in a direction perpendicular to the moving direction of the shaft 5) that is originally visible from the cross section of the left and right coils 4 does not become difficult to see a lead line or the like. Omitted.

  Generally, the switchgear is switched from a closed state (ON state) to an open state (OFF state) by using a stored energy such as an open spring. At that time, the opening impact is applied to the suction portion 15 of the core 2 and the suction portion 16 of the armature 3 which give the initial load force in the opposite direction. The part 15 may be plastically deformed. When this plastic deformation occurs, the initial load force varies with this plastic deformation, and the drive characteristics of the electromagnetic actuator deteriorate. 20 and 21 exemplify the case where the core 2 and the armature 3 are prisms, the same applies to the case of a cylinder.

  As shown in FIG. 20, the first electromagnetic actuator 1 according to the seventh embodiment arranges the buffer material 41 in the suction portion 15 of the core 2 to which the opening shock is applied, and applies the opening shock to the buffer material. It has a configuration. As a result, the first electromagnetic actuator 1 according to the seventh embodiment can prevent plastic deformation of the suction portion 15 of the core 2 that gives an initial load force in the opposite direction, and can suppress variations in the initial load force. The drive characteristics do not deteriorate. As the buffer material 41, a non-magnetic metal such as stainless steel that is relatively hard to be plastically deformed or an elastic member such as rubber or resin that can absorb an impact can be used. In addition, as a method of arranging the buffer material 41 in the core 2, the case of FIG.

  FIG. 23 is a partial view of a second electromagnetic actuator according to Embodiment 7 of the present invention, and FIG. 24 is a view of the cushioning material of FIG. The second electromagnetic actuator 1 of the seventh embodiment shown in FIG. 23 is an example in which the area of the suction portion 15 of the core 2 is made smaller than that of the first electromagnetic actuator 1 of the seventh embodiment shown in FIG. .

  In addition, by changing the thickness of the buffer material 41, the magnetic gap between the attracting portion 15 of the core 2 and the attracting portion 16 of the amateur 3 that gives an initial load force in the opposite direction can be adjusted, and the magnitude of the reverse initial load force can be adjusted. Can be adjusted easily. Therefore, it is possible to stabilize the drive characteristics of the electromagnetic actuator 1 that change in accordance with component variations and assembly variations by adjusting the initial load force in the opposite direction by changing the thickness of the buffer material 41.

  20 and 23, the cushioning material 41 is disposed on the core 2 side, but may be disposed on the amateur 3 side as illustrated in FIGS. 25 and 27. FIG. 25 is a partial view of a third electromagnetic actuator according to Embodiment 7 of the present invention, and FIG. 26 is a view showing the cushioning material of FIG. 27 is a partial view of a fourth electromagnetic actuator according to the seventh embodiment of the present invention, and FIG. 28 is a view of the cushioning material of FIG. The electromagnetic actuator 1 according to the seventh embodiment shown in FIGS. 25 and 27 includes at least a part of the suction part 16 of the circumferential extension 11b in the amateur 3 and the suction part 16 of the amateur 3 to which the opening impact is applied. A buffer material 41 is arranged so as to be interposed between the suction portion 15 of the core 2 and a contact opening shock is applied to the buffer material. In FIG. 25 and FIG. 27, the recessed part for arrange | positioning the shock absorbing material 41 in the attraction | suction part 16 of the amateur 3 is formed. Since the portion of the circumferentially extending portion 11b in the armature 3 facing the core 2 is the suction portion 16, the portion of the cushioning material 41 opposite to the coil shaft 4a (portion on the outer peripheral side) is the suction portion 16 of the armature 3 and the core 2 It is a part of the buffer material 41 arrange | positioned so that it may interpose between the suction parts 15 of this.

  The electromagnetic actuator 1 according to the seventh embodiment includes a first magnetic path M1 through which a magnetic flux passes through an attracting portion 15 provided inside the core 2, and an armature 3 on the outside of the first magnetic path M1 and a magnetic flux. The second magnetic path M2 through which the armature passes is formed, so that a stable initial load force can be applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1. Moreover, since the electromagnetic actuator 1 according to the seventh embodiment includes the buffer material 41 between the suction portions 15 of the core 2 or the suction portion 16 of the armature 3, even if the rigidity of the suction portion 15 of the core 2 is small, the core 2. The plastic deformation of the suction portion 15 can be prevented, and variations in the initial load force can be suppressed. For this reason, the electromagnetic actuator 1 of Embodiment 7 can maintain the drive characteristic of an electromagnetic actuator with favorable. That is, the electromagnetic actuator 1 of Embodiment 7 can extend the product life.

  The opening / closing device 50 according to the seventh embodiment includes a first magnetic path M1 through which the magnetic flux passes through the attracting portion 15 provided inside the core 2, and an armature 3 that faces the armature 3 outside the first magnetic path M1. Since the electromagnetic actuator 1 that forms the second magnetic path M2 through which the armature passes is provided, a stable initial load force is applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1. Thus, the closing operation for closing the current interrupting portion 21 can be reliably performed. In addition, the opening / closing device 50 according to the seventh embodiment includes the buffer material 41 between the suction part 15 of the core 2 or the suction part 16 of the amateur 3 in the electromagnetic actuator 1. Even when the rigidity is small, plastic deformation of the suction portion 15 of the core 2 can be prevented, and variations in the initial load force can be suppressed. For this reason, the opening / closing device 50 according to the seventh embodiment can maintain the drive characteristics of the electromagnetic actuator in good condition, and can reliably perform the closing operation for closing the current interrupting unit 21 for a long period of time.

Embodiment 8 FIG.
29 and 30 are diagrams illustrating coil current control of the electromagnetic actuator according to the eighth embodiment of the present invention. FIG. 29 is a diagram for explaining the current value control of the coil current, and FIG. 30 is a diagram for explaining the timing of the coil current value control. 31, FIG. 32 and FIG. 33 are diagrams showing examples of the current supply device according to the eighth embodiment of the present invention. 34 and 35 are schematic cross-sectional views of the electromagnetic actuator according to the eighth embodiment of the present invention. FIG. 34 shows the second state of the electromagnetic actuator 1, that is, the closing state of the switching device 50 (see FIG. 2). FIG. 35 shows the first state of the electromagnetic actuator 1, that is, the opening state of the switching device 50 (see FIG. 1). ). The diagrams showing the basic configuration of the electromagnetic actuator 1 and the opening / closing device 50 in the eighth embodiment are the same as those in FIGS. 1 to 4 showing the first embodiment. The electromagnetic actuator 1 of the eighth embodiment differs from the electromagnetic actuator 1 of the first embodiment in that it includes a current supply device 43 that performs coil current control that reduces or prevents bounce of the armature 3 due to the opening impact.

  The electromagnetic actuator 1 closes the contacts (movable contact 22 and fixed contact 23) of the current interrupting part 21 via the link mechanism 24. In the electromagnetic actuator 1, when the current interrupting portion 21 of the switchgear 50 is opened, the opening impact caused by the collision between the armature 3 and the core 2 is applied to the armature 3, and the armature 3 is shown in FIGS. 34 and 35. Bounce upwards. The bounce of the amateur 3 moves the movable contact 22 through the link mechanism 24 in a direction (downward in the drawing in FIG. 1) that closes the contact (movable contact 22, fixed contact 23) of the current interrupting portion 21. The separation distance between them, that is, the separation distance between the movable contact 22 and the fixed contact 23 is reduced, and the breaking performance of the switchgear 50 is lowered.

  FIG. 29 shows an example of drive characteristics of the electromagnetic actuator 1 at the opening position (see FIG. 1) in the first embodiment. In FIG. 29, the vertical axis represents the applied force, and the horizontal axis represents the coil current. The coil current is supplied from the coil power supply 45 or another coil power supply. In a certain coil current value in a current region that is equal to or smaller than the current value Ic2 and equal to or greater than 0, the magnetic flux passing through the magnetic path M1 is larger than the magnetic flux passing through the magnetic path M2. In the current region of current value Ic2 or less and 0 or more, the magnetic gap that provides the attractive force in the opening direction (downward direction in FIG. 1) in the magnetic path M1 is small. It is possible to make the output of the actuator 1 negative (downward in FIG. 1). At the time of opening, a certain coil current, for example, a coil current having a current value Ic2 is applied so that the negative applying force shown in FIG. 29 is generated immediately before the armature 3 is bounced when an opening shock is applied to the armature 3. As a result, an attractive force in the opening direction of the opening / closing device 50 (downward in the drawing in FIG. 1) is generated in the amateur 3, and it is possible to reduce bounce of the amateur 3 due to the opening impact. As a result, the electromagnetic actuator 1 according to the eighth embodiment can suppress the decrease in the separation distance between the contacts of the current interrupting portion 21, that is, the separation distance between the movable contact 22 and the fixed contact 23, and the current interruption of the switching device 50. Performance degradation can be prevented.

  In the method of energizing a certain coil current immediately before the armature 3 is bounced when an opening shock is applied to the armature 3 at the time of the opening, for example, the opening time T1 is measured in advance as shown in FIG. Then, a control (first energization method) for energizing a certain coil current, for example, a coil current having a current value Ic2, just before reaching the opening time T1 may be performed. FIG. 30 shows the stroke characteristics of the armature 3 when the contact of the current interrupting part 21 is changed from the closed state to the open state. In FIG. 30, the vertical axis is an amateur stroke, and the horizontal axis is time. The stroke value of the armature 3 shown in FIG. 30 is 0 when the current interrupting part 21 is in a closed state, and the current interrupting part 21 is in the maximum open state (final open state, maximum open state). Sometimes St1. In the stroke of the armature 3 shown in FIG. 30, the positive direction is the downward direction on the page of FIG.

  In order to energize a certain coil current, for example, a coil current having a current value Ic2, immediately before reaching the opening time T1, the electromagnetic actuator 1 of the eighth embodiment includes a coil power supply 45 having a timer 46, for example (FIG. 31). The coil power supply 45 energizes a certain coil current, for example, a coil current having a current value Ic2, when the time counted by the timer after the opening operation of the current interrupting unit 21 is started becomes T1. The coil power supply 45 is the current supply device 43 described above.

  There is also another energization method different from the first energization method. As the second energization method, as shown in FIG. 32, the armature stroke shown in FIG. 30 is measured using a stroke detector 47 such as a laser displacement meter or a potentiometer, and the final opening position (maximum opening) of the current interrupting unit 21 is measured. Just before the stroke value St1 that is the pole position), a control to energize a certain coil current, for example, the coil current having the current value Ic2, may be performed. A current supply device 43 that executes the second energization method shown in FIG. 32 is an example including a coil power supply 45 and a stroke detector 47.

  Further, as a third energization method, as shown in FIG. 33, a change in acceleration is measured with an acceleration sensor 48 or the like attached to the core 2 or the amateur 3, and an inflection that occurs at the moment when the opening impact is applied to the amateur 3. In terms of this point, a control method of energizing a certain coil current, for example, a coil current having a current value Ic2 is also conceivable. A current supply device 43 that executes the third energization method shown in FIG. 33 is an example including a coil power supply 45 and an acceleration sensor 48. Still other methods are possible. As a fourth energization method, as shown in FIGS. 34 and 35, the switch 51 is forcibly turned on (ON) by the stroke of the armature 3, and a certain current, for example, a coil current having a current value Ic2 is energized to the coil. Configuration is also conceivable.

  In order to execute the fourth energization method, the electromagnetic actuator 1 according to the eighth embodiment includes, for example, a mechanically operated switch 51 and a DC power source 52 that energizes a certain coil current, for example, a coil current having a current value Ic2. ing. The switch 51 is disposed at a position where the switch 51 is turned on immediately before or when the armature 3 collides with the core 2. Once the switch 51 is turned on, it remains on even if the amateur 3 bounces. The switch 51 is turned off when the current interrupting unit 21 is switched to the closed state, that is, the switching device 50 is closed. Note that the DC power supply 52 stops energization of the current when the current interrupting unit 21 is completely opened. A current supply device 43 that executes the fourth energization method shown in FIGS. 34 and 35 is an example including a switch 51 and a DC power supply 52. 34 and 35 show cross-sectional views of the electromagnetic actuator 1, but hatching is omitted in the cross-section so as not to make it difficult to see the lead lines and the like. In FIGS. 34 and 35, the outer peripheral lines that are originally visible from the cross section of the left and right coils 4 are omitted so that the lead lines and the like are not easily seen.

  In the electromagnetic actuator 1 according to the eighth embodiment, when the opening / closing device 50 is opened, a negative applying force shown in FIG. 29 is generated immediately before the opening impact is applied to the armature 3 and the armature 3 bounces. Since a constant coil current, for example, a coil current having a current value Ic2 is applied, the armature 3 generates an attractive force in the opening direction of the switchgear 50 (downward in the drawing in FIG. 1), and the armature 3 due to the opening shock. Bounce can be reduced. As a result, the electromagnetic actuator 1 according to the eighth embodiment can suppress the decrease in the separation distance between the contacts of the current interrupting portion 21, that is, the separation distance between the movable contact 22 and the fixed contact 23, and the current interruption of the switching device 50. Performance degradation can be prevented.

  In the switchgear 50 according to the eighth embodiment, when the electromagnetic actuator 1 opens the switchgear 50, the negative applying force shown in FIG. 29 is applied immediately before the armature 3 bounces when an opening impact is applied to the armature 3. Since a certain coil current to be generated, for example, a coil current having a current value Ic2, is applied, bounce of the armature 3 due to the opening impact can be reduced, and the separation distance between the contacts of the current interrupting portion 21, that is, the movable contact 22 And the contact distance between the fixed contact 23 can be suppressed, and the current interruption performance of the switching device 50 can be prevented from being lowered.

  Note that the switch 51 is not limited to a mechanically operated switch pushed by the amateur 3, and may be another switch. For example, it may be turned on with a trigger signal indicating that signals from the stroke detector 47 and the acceleration sensor 48 have exceeded a predetermined threshold. The coil current control method for reducing the bounce of the armature 3 due to the opening impact shown in the eighth embodiment can also be applied to the electromagnetic actuator 1 and the switchgear 50 according to the second to seventh embodiments.

  In the present invention, it is possible to freely combine the contents of the respective embodiments within a consistent range, and to appropriately modify and omit the respective embodiments.

  DESCRIPTION OF SYMBOLS 1 ... Electromagnetic actuator, 2 ... Core, 3 ... Amateur, 4 ... Coil, 4a ... Coil shaft, 6a ... Nonmagnetic material, 7 ... Core body part, 8 ... Core lid part, 8a ... Inner side surface, 9 ... Core open end 9a ... inner peripheral surface, 9b ... inner side surface, 9c ... projection, 10 ... core extension, 11 ... amateur root, 11b ... circumferential extension, 11c ... projection, 12 ... amateur extension, 14 ... Opening, 15 ... suction part, 21 ... current interrupting part, 22 ... movable contact, 23 ... fixed contact, 24 ... link mechanism, 41 ... buffer material, 43 ... current supply device, 50 ... switchgear, G1, G2, G4 ... Magnetic gap, L1 ... Accumulation tolerance, M1, M2, M3 ... Magnetic path

The electromagnetic actuator of the present invention drives an armature of a magnetic body that is movably disposed inside a coil by a magnetic flux generated by the coil. The electromagnetic actuator is disposed on the outside of the coil, the root portion, the armature that extends from the root portion in the direction of the coil axis of the coil and has an extending portion having a smaller outer diameter than the root portion, and the coil. A magnetic core that forms a magnetic path through which the magnetic flux generated by the coil passes with the armature, and the armature has a circumferentially extending portion that extends in the circumferential direction perpendicular to the coil axis from the outer periphery of the extending portion. The core is provided to face the circumferential extension portion of the amateur, and a suction portion that generates an attractive force between the core and the circumferential extension portion when the magnetic flux generated by the coil passes through the core. has inside, the suction portion on the outer side of the first magnetic path to generate a suction force in the driving direction and opposite amateur by magnetic flux generated by the coil passes, to oppose the armature Characterized in that it has an armature opposite portion forming a second magnetic path in which the magnetic flux generated by the coil passes with.

The electromagnetic actuator according to the present invention includes a first magnetic path through which a magnetic flux generated by a coil passes through an attraction portion provided inside a core, and an armature that is opposed to an amateur outside the first magnetic path and is generated by the coil. Since the second magnetic path through which the magnetic flux passes is formed, a stable initial load force can be applied to the amateur when the amateur is driven without leaking the magnetic flux outside the electromagnetic actuator.

As described above, the electromagnetic actuator 1 according to the first embodiment is an electromagnetic actuator that drives the magnetic armature 3 movably disposed inside the coil 4 with the magnetic flux generated by the coil 4. The electromagnetic actuator 1 according to the first embodiment is provided with a coil 4, a root part (amateur root part 11), a base part (amateur root part 11) extending from the root part (amateur root part 11) in the direction of the coil shaft 4 a and a root part. An armature 3 having a stretched portion (amateur stretched portion 12) having an outer diameter smaller than that of the (amateur root portion 11), and a magnet that is disposed outside the coil 4 and through which the magnetic flux generated by the coil 4 along with the armature 3 passes. And a magnetic core 2 that forms a path. Amateur 3 of the electromagnetic actuator 1 of the first embodiment, has a circumferential extension portion 11b that extends perpendicular circumferentially coil axis 4a from the outer periphery of the extending portion (armature extending portion 12), the core 2, the armature 3 The suction portion 15 is provided on the inner side of the core 2 so as to generate a suction force between the circumferential extension portion 11b and the circumferential extension portion 11b when the magnetic flux passes. 15 has an armature facing portion (inner peripheral surface 9a) that forms a second magnetic path M2 that faces the armature 3 and passes the magnetic flux outside the first magnetic path M1 through which the flux passes. To do. The electromagnetic actuator 1 according to the first embodiment includes a first magnetic path M1 through which a magnetic flux passes through an attractive portion 15 provided inside the core 2, and an armature 3 that faces the armature 3 outside the first magnetic path M1. The second magnetic path M2 through which the armature passes is formed, so that a stable initial load force can be applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1.

The switching device 50 according to the first embodiment is configured to connect the current interrupting unit 21 having the movable contact 22 and the fixed contact 23 therein, and the movable contact 22 of the current interrupting unit 21 to the fixed contact 23 via the link mechanism 24. The electromagnetic actuator 1 to be moved is provided. The electromagnetic actuator 1 is provided to extend from the coil 4, the root portion (amateur root portion 11), the root portion (amateur root portion 11) to the coil axis 4 a of the coil 4, and the root portion (amateur root portion 11). The armature 3 having a stretched portion (amateur stretched portion 12) having a smaller outer diameter than the armature 3) and a magnetism that forms a magnetic path through which the magnetic flux generated by the coil 4 passes with the armature 3. A core 2 of the body. The armature 3 of the electromagnetic actuator 1 has a circumferentially extending portion 11b extending in the circumferential direction perpendicular to the coil shaft 4a from the outer periphery of the extending portion (amateur extending portion 12), and the core 2 is a circumferentially extending portion of the amateur 3 The suction portion 15 is provided on the inner side of the core 2 so as to generate a suction force with the circumferential extension portion 11b when the magnetic flux passes and the magnetic flux passes through the suction portion 15. The armature facing part (inner peripheral surface 9a) which forms the 2nd magnetic path M2 which opposes the armature 3 and the magnetic flux passes outside of the 1st magnetic path M1 to perform is characterized by the above-mentioned. The opening / closing device 50 according to the first embodiment includes a first magnetic path M1 through which the magnetic flux passes through the attracting portion 15 provided inside the core 2, and the magnetic flux that faces the armature 3 outside the first magnetic path M1. Since the electromagnetic actuator 1 that forms the second magnetic path M2 through which the armature passes is provided, a stable initial load force is applied to the armature 3 when the armature 3 is driven without leaking the magnetic flux outside the electromagnetic actuator 1. Thus, the closing operation for closing the current interrupting portion 21 can be reliably performed.

The electromagnetic actuator of the present invention drives an armature of a magnetic body that is movably disposed inside a coil by a magnetic flux generated by the coil. The electromagnetic actuator is disposed on the outside of the coil, the root portion, the armature that extends from the root portion in the direction of the coil axis of the coil and has an extending portion having a smaller outer diameter than the root portion, and the coil. A magnetic core that forms a magnetic path through which the magnetic flux generated by the coil passes with the armature, and the armature has a circumferentially extending portion that extends in the circumferential direction perpendicular to the coil axis from the outer periphery of the extending portion. The core is provided to face the circumferential extension portion of the amateur, and a suction portion that generates an attractive force between the core and the circumferential extension portion when the magnetic flux generated by the coil passes through the core. It has an inside, and the attracting part faces the amateur outside the first magnetic path that generates an attracting force in the direction opposite to the driving direction of the amateur by passing the magnetic flux generated by the coil. Have a armature opposing portion where the magnetic flux generated by the coil to form a second magnetic path which passes together, between the armature opposing portion where the magnetic flux in the second magnetic path passes, the armature against the armature facing portion A nonmagnetic material is disposed on the surface .

Claims (12)

An electromagnetic actuator for driving an armature of a magnetic body movably disposed inside a coil by a magnetic flux generated by the coil,
The coil;
A base part, and the armature having an extension part that extends from the base part in the direction of the coil axis of the coil and has an outer diameter smaller than the base part, and
A magnetic core disposed on the outside of the coil and forming a magnetic path through which the magnetic flux generated by the coil passes with the armature, and
The amateur has a circumferentially extending portion extending in a circumferential direction perpendicular to the coil axis from the outer periphery of the extending portion,
The core is
The armature has a suction portion that is provided opposite to the circumferential extension portion of the amateur and generates an attractive force between the circumferential extension portion when the magnetic flux passes,
An electromagnetic actuator comprising an armature facing portion that forms a second magnetic path that faces the armature and that passes the magnetic flux outside the first magnetic path through which the magnetic flux passes through the attraction portion. The core has a core opening end that forms an opening through which the extension of the amateur can be inserted;
The amateur facing portion is an inner peripheral surface facing the extending portion of the amateur at the core opening end portion,
The electromagnetic actuator according to claim 1, wherein the suction portion is formed on an inner surface facing the circumferentially extending portion at the core opening end. The core includes a core opening end portion that forms an opening through which the extension portion of the armature can be inserted, and a core lid that faces the core opening end portion at a position away from the core opening end portion in the direction of the coil axis. A core body part that connects the core lid part and the core opening end, and a core extension part that extends toward the coil shaft side on the core lid part side of the core body part. ,
The amateur facing portion is an inner surface of the core lid portion facing the root portion of the amateur,
The electromagnetic actuator according to claim 1, wherein the suction portion is formed in the core extension portion facing the circumferential extension portion.   The magnetic gap between the attracting portion through which the magnetic flux passes in the first magnetic path and the amateur facing the attracting portion is the amateur facing portion through which the magnetic flux passes through the second magnetic path and the amateur facing The electromagnetic actuator according to any one of claims 1 to 3, wherein the electromagnetic actuator is smaller than a magnetic gap between the armature and the armature.   5. The magnetic flux passage area through which the magnetic flux passes through the attraction portion of the core is smaller than the magnetic flux passage area through which the magnetic flux passes through the amateur facing portion in the second magnetic path. The electromagnetic actuator according to any one of the above.   The at least one of the suction part of the core and the circumferential extension part of the amateur facing the suction part has a projecting part protruding to the opposite side of the core. The electromagnetic actuator of Claim 1.   The projecting portion is arranged on the outer side in the circumferential direction from the inner peripheral surface on the coil shaft side in the projecting facing portion which is the counterpart side, and is spaced apart from the integration tolerance of the core and the amateur. Item 7. The electromagnetic actuator according to Item 6.   The electromagnetic actuator according to claim 1, further comprising a nonmagnetic material between the suction portion of the core and the circumferential extension portion of the amateur.   9. The suction portion of the core and the circumferentially extending portion of the armature, each facing surface facing each other is inclined with respect to the coil axis. The electromagnetic actuator according to item.   When the amateur moves toward the core, a current that generates a suction force between the circumferential extension portion of the amateur and the suction portion of the core is applied when the amateur collides with the core, or The electromagnetic actuator according to claim 1, further comprising a current supply device that supplies the coil to the coil immediately before.   11. The electromagnetic actuator according to claim 1, further comprising a buffer material between the suction portion of the core and the circumferential extension portion of the amateur.   The current interruption part which has a movable contact and a fixed contact inside, and the movable contact of the current interruption part is moved so that it may connect to the fixed contact via a link mechanism. Opening and closing device comprising an electromagnetic actuator.

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