JP2007027370A - Electromagnetic manipulation mechanism, power switch using the same, and power switching apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic manipulating mechanism for delaying start of operation not considering limitation on application environment, and also to provide a power switching apparatus using the same mechanism. <P>SOLUTION: The electromagnetic manipulation mechanism comprises a rotor having an axis to make reciprocative movement in the axial direction, a yoke including a surface facing to the side surface of the rotor in parallel to the axial direction and both end surfaces of the rotor in the axial direction, a permanent magnet allocated between the yoke and rotor, two or more drive coils allocated in the internal side of yoke and in the periphery of the rotor, and a power source for applying an excitation current to the drive coils. Moreover, this mechanism also comprises a first magnetic circuit which is extended to the rotor via the yoke and one end surface of the rotor from the permanent magnet, and a second magnetic circuit extended to the rotor via the yoke and the other end surface of the rotor from the permanent magnet. In this electromagnetic manipulating mechanism, the drive coil is provided with a forward drive coil excited for forward movement of the rotor, and a backward drive coil connected electrically in both terminals to induce an induction current when the forward drive coil is excited. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic operation mechanism capable of stably holding a mover at two positions, a power switch and a power switch using the same.

  A conventional electromagnetic operation mechanism of a power switchgear includes a yoke having a frame-shaped edge surrounding the housing portion, a magnetic pole projecting from the edge of the yoke toward the housing portion, facing the housing portion, and a housing. A rectangular parallelepiped movable element that is housed in a part, supported so as to be linearly movable, and disposed between opposing magnetic poles, and a permanent magnet fixed to the movable element with a slight gap between the magnetic poles , Two square annular excitation coils each having a rectangular inner periphery substantially circumscribed coaxially at both ends of the mover facing the moving direction of the mover, and both ends facing the moving direction of the mover And a movable shaft connected and supported by a bearing provided in the yoke so as to be linearly movable.

  The permanent magnet has a magnetic field in a direction perpendicular to the moving direction of the mover. Due to the magnetomotive force of the permanent magnet, the mover has a first stable point where one end in the moving direction of the mover is close to the yoke and a second stable point where the other end of the mover is close to the yoke. It is held in a stable state at the stable point. Thus, the mover is reciprocated between two stable positions, and the movable contact in the power switch connected via the movable shaft connected to the mover is reciprocated to open and close the power. .

  Now, when the mover is held in a stable state at the first stable point, the direction to cancel the magnetic flux generated by the permanent magnet passing between one end of the mover and the yoke When an exciting current is passed through the exciting coil, the magnetic flux passing between one end of the mover close to the yoke decreases, and one end of the mover close to the yoke The power to draw each other is reduced. Conversely, the magnetic flux passing between the other end of the mover and the yoke is increased, and the force that pulls the other end of the mover and the yoke together increases. When the force that attracts the other end of the mover and the yoke is greater than the force that attracts the one end of the mover and the yoke, the mover that is adjacent The mover moves so that the gap between the one end of the coil and the yoke becomes wide, and the mover stops at the second stable point (see, for example, Patent Document 1).

By the way, when a short circuit accident occurs in the AC power system, since the current immediately after the occurrence of the short circuit accident includes a large DC component, the current waveform is asymmetric with respect to zero current. Thereafter, the DC component gradually attenuates, and the current waveform returns symmetrically with respect to the current zero. As described above, since the current value is large immediately after the occurrence of the short circuit accident, when the contact pair is opened, the contact is significantly worn.
In addition, since the power switchgear can cut off the current only at the point where the current value becomes zero, it is also assumed that the current does not cross the current zero point if the DC component is very large. Attempting to open the contact pair in such a case does not interrupt the current even after half a cycle has elapsed, so an arc is generated between the contacts over a long period of one cycle or more. It may cause wear, deterioration of power switchgear, fouling and inability to shut off.

Therefore, the power switchgear does not operate immediately after the occurrence of the accident current, and specifically, the opening operation is started after waiting for about two cycles. For this reason, the following structure is proposed with respect to the electromagnetic operation mechanism. For example, it is proposed to provide an electronic circuit and set a timer. In this case, the operation delay can be easily set (see, for example, Patent Document 2).
In order to reduce the operation speed at a low cost, a part of the magnetic circuit composed of a movable iron core, a fixed iron core, a drive coil, and a permanent magnet is provided with a counter electromotive current generating coil arranged so as to be linked to the magnetic flux, It has been proposed to apply a braking force to a movable iron core by inducing a magnetic flux change generated by the movement of the movable iron core as an electromotive force in a counter electromotive current generating coil (see, for example, Patent Document 3).
Also, when a short-circuit coil is added to the electromagnetic overcurrent relay in addition to the electromagnetic coil, and the input current of the electromagnetic coil suddenly cuts off, magnetic flux is generated by the induced voltage generated in the short-circuit coil, shortening the operation. It has also been proposed to continue the time (see, for example, Patent Document 4).

International Publication No. 95/07542 Pamphlet International Publication No. 96/32734 (FIG. 3) JP 2001-256868 A JP-A-8-287814

However, when the electronic circuit is used, the electronic circuit is easily affected by environmental changes and disturbances, so that the use environment is limited in order to ensure the reliability of the electronic circuit. For example, there is a problem that it is difficult to use an electronic circuit when the surrounding environment is severe, such as an outdoor circuit breaker, or when it is difficult to spend maintenance on an inexpensive circuit breaker.
In addition, if a short-circuit coil or a counter electromotive current coil is additionally arranged separately from the drive coil and the operation start time is delayed, the electromagnetic operation mechanism becomes large, resulting in a problem of high cost and high weight.

  An object of the present invention is to provide an electromagnetic operation mechanism that delays the start of operation without newly considering restrictions on the use environment, and a power switchgear using the electromagnetic operation mechanism.

  An electromagnetic operating mechanism according to the present invention has a shaft and is movable in a reciprocating motion in the axial direction, and is opposed to a side surface of the movable member parallel to the axial direction and both end surfaces of the movable member in the axial direction. A yoke having a surface, a permanent magnet arranged in a closed magnetic circuit composed of the yoke and the mover, and two or more drive coils arranged around the yoke or the mover A first magnetic circuit extending from the permanent magnet to the mover via one end face of the mover through the yoke, and the permanent magnet. In an electromagnetic operation mechanism in which a second magnetic circuit is formed from a magnet to the mover via the yoke and the other end surface of the mover, the drive coil moves the mover forward. At least one forward drive excited for And yl, both terminals are electrically connected, and a least one backward drive coil induced current is induced when the forward driving coil is energized.

  The effect of the electromagnetic operating mechanism according to the present invention is that the both terminals of the return drive coil are connected, so that when the exciting current is passed through the forward drive coil, induction that attracts the mover and the yoke close to the backward drive coil A current flows, and the start of movement of the mover can be delayed. Therefore, a special control circuit is unnecessary, and the delay time can be easily adjusted with a very simple configuration.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a configuration of an electromagnetic operating mechanism according to Embodiment 1 of the present invention. 2A and 2B are cross-sectional views of a power switchgear using the electromagnetic operation mechanism of the first embodiment. FIG. 3 is an explanatory diagram for explaining the operation of the electromagnetic operation mechanism according to the first embodiment. In FIG. 1, the mechanism portion is shown in a sectional view.

  FIG. 1 is a diagram illustrating a state in which the mover 2 of the electromagnetic operation mechanism 1A is stopped at the first stable position. The electromagnetic operation mechanism 1A has a prismatic shape, a movable element 2 having a cylindrical center hole along the central axis of the rectangular cylinder, two permanent magnets 3 attached to a pair of opposing side surfaces of the movable element 2, 4. It has movable shafts 5 and 6 that are inserted into the center hole of the mover 2 from both sides and are partially screwed to the mover 2 so that the end face of the mover 2 contacts the yoke 11. The mover 2, the permanent magnets 3 and 4, and the movable shafts 5 and 6 can move linearly as a unit in the axial direction of the mover 2. The mover 2 is made of a magnetic material.

  The electromagnetic operation mechanism 1A is further separated by two lengths of the mover 2 in the axial direction of the mover 2 and is arranged coaxially with the axis of the mover 2 and has a mouth-shaped cross section. The forward drive coil 7, the backward drive coil 8, and the permanent magnets 3, 4 are opposed to each other with a gap, and the magnetic poles 9, 10 are sandwiched by the side surfaces of the forward drive coil 7 and the backward drive coil 8. Further, a yoke 11 is continuously connected to the outside from the magnetic poles 9 and 10, covers the outer surfaces of the forward drive coil 7 and the backward drive coil 8, and extends so as to face the end surface in the axial direction of the mover 2. Have. A bearing 12 that rotatably supports the movable shafts 5 and 6 is fitted into a hole provided in the surface of the yoke 11 that faces the end surface in the axial direction of the mover 2. As a result, the mover 2, the permanent magnets 3 and 4, and the movable shafts 5 and 6 are integrated, and reciprocates in the axial direction of the mover 2 along the surface of the magnetic poles 9 and 10 facing the permanent magnets 3 and 4. It is attached to the yoke 11 as possible. The magnetic poles 9 and 10 and the yoke 11 are produced by laminating soft iron plates.

The electromagnetic operation mechanism 1 </ b> A further includes a resistor 14 connected between both terminals of the backward driving coil 8, a forward driving coil 7, and a driving power supply 15 that causes an exciting current to flow through the backward driving coil 8. The drive power supply 15 is configured such that the forward drive coil 7 and the backward drive coil 8 are excited with a magnetic flux in the same direction as the magnetic flux excited by the permanent magnets 3 and 4 passing through the forward drive coil 7 and the backward drive coil 8. Apply excitation current.
In addition, although the permanent magnets 3 and 4 are arrange | positioned between the magnetic poles 9 and 10 and the needle | mover 2, it cannot be overemphasized that you may arrange | position inside the needle | mover 2 or the yoke 11, for example. Moreover, although the forward drive coil 7 and the reverse drive coil 8 are arrange | positioned inside the yoke 11, it cannot be overemphasized that you may arrange | position outside the yoke 11, for example.

  2A and 2B are sectional views of the power switchgear 20 using the electromagnetic operation mechanism 1A. FIG. 2A shows a state where the power switchgear 20 is open, and FIG. 2B shows a state where the power switch 20 is closed. The power switchgear 20 is connected to the movable shaft 6 of the electromagnetic operation mechanism 1A, and is a lever portion 22 rotatably supported by the rotation center shaft 21, and a vacuum connected to the lever portion 22 via a contact pressure spring 23. A movable contact 25 of the valve 24 and a fixed contact 26 facing the movable contact 25 are provided. The lever portion 22 is biased by a spring 30 so as to rotate counterclockwise on the rotation center shaft 21 in FIG. The movable contact 25 moves between an open state (FIG. 2A) and a closed state (FIG. 2B) to open / close electric power with the fixed contact 26.

  Next, the operation of the electromagnetic operation mechanism 1A will be described with reference to FIGS. 2 (a), 2 (b), and 3. FIG. The magnetic circuit is formed symmetrically with respect to the axis of the mover 2.

  The electromagnetic operation mechanism 1A has two magnetic circuits S1 and S2 that include the permanent magnets 3 and 4, the mover 2, and the magnetic poles 9 and 10 in common. In the magnetic circuit S1, the permanent magnets 3 and 4, the magnetic poles 9 and 10, the yoke body 11a, the yoke lower portion 11b, the first gap 27 between one end face of the mover 2 and the yoke 11, the mover 2 are connected in series.

  Further, in the magnetic circuit S2, the permanent magnets 3, 4, the magnetic poles 9, 10, the yoke body 11a, the yoke upper portion 11c, the second gap 28 between the other end surface of the mover 2 and the yoke 11, The mover 2 is connected in series.

The mover 2 substantially contacts the yoke 11 on the gap 27 side, and as a result, the length of the first gap 27 is sufficiently smaller than the length of the second gap 28, so that the first Located at a stable point. Further, the mover 2 substantially abuts with the yoke 11 on the gap 28 side, and the length of the second gap 28 is sufficiently smaller than the length of the first gap 27, so that the second stable Located at a point.
For example, when the mover 2 comes close to the yoke lower portion 11b, the magnetic resistance of the first gap 27 is much smaller than the magnetic resistance of the second gap 28, so that the magnetic flux Φ1 of the magnetic circuit S1 is equal to the magnetic circuit S2. Is larger than the magnetic flux Φ2. Therefore, since the magnetic attraction force acting on the first gap 27 is larger than the magnetic attraction force acting on the second gap 28, the added magnetic attraction force pressurizes the mover 2 toward the yoke lower portion 11b.
Conversely, when the mover 2 is close to the yoke upper portion 11c, the magnetic resistance of the second gap 28 is much smaller than the magnetic resistance of the first gap 27, so that the magnetic flux Φ2 of the magnetic circuit S2 is equal to the magnetic circuit. It is larger than the magnetic flux Φ1 of S1. Therefore, since the magnetic attraction force acting on the second gap 28 is larger than the magnetic attraction force acting on the first gap 27, the magnetic attraction force acting on the added mover 2 moves the mover 2 toward the yoke upper portion 11c. Pressurize.

Next, the movement of the mover 2 will be described.
In order to move the mover 2 from the first stable point to the second stable point, an exciting current is supplied to the forward drive coil 7 to generate a magnetic flux in a direction opposite to the magnetic flux in the first gap 27 and is in a holding state. The holding force of the mover 2 is reduced, and the magnetic flux of the second gap 28 is increased so as to be larger than the magnetic attractive force of the first gap 27.
For example, as shown in FIG. 3, when the mover 2 is held at the first stable point, the drive power supply 15 is generated so that a magnetic flux in the same direction as the magnetic flux by the permanent magnets 3 and 4 is generated in the magnetic circuit T2. When a current is passed through the forward drive coil 7, a magnetic flux in the opposite direction to the magnetic flux generated by the permanent magnets 3 and 4 in the first gap 27 is generated in the magnetic circuit U2.
However, an induced current is induced in the closed circuit of the return drive coil 8 to which both terminals are connected via the resistor 14 so as to cancel the magnetic flux generated by the excitation of the forward drive coil 7, and as a result, the magnetic circuit Since a magnetic flux in the same direction as the magnetic flux generated by the permanent magnets 3 and 4 in the first gap 27 is generated in V2, the mover 2 does not start moving.
The magnitude of the induced electromotive force U induced in the backward driving coil 8 is given by the equation (1).

    U = −N × (dΦ / dt) (1)

Here, N is the number of turns of the return drive coil 8, and dΦ / dt is the time change of the magnetic flux passing through the return drive coil 8 that is generated when an excitation current is passed through the forward drive coil 7.
The induced current induced in the return drive coil 8 can be calculated from circuit constants determined by the induced electromotive force U, the resistor 14 and the sum (R) and inductance (L) of the resistance of the return drive coil 8. The induced current is attenuated according to the time constant τ = L / R.
As a result, when the induced current decreases to a certain value or less, the magnetic attractive force of the first gap 27 decreases and the magnetic attractive force of the second gap 28 increases, so that the magnetic attractive force of the second gap 28 increases. Mainly acting on the mover 2, the mover 2 passes between the opposing magnetic poles 9, 10 and moves into the rectangular inner periphery of the forward drive coil 7.
That is, it means that the delay time can be freely set by appropriately selecting the resistance value of the resistor 14.
In this way, the mover 2 moves, and the moved mover 2 is held at the second stable point.

Further, in order to move the mover 2 from the second stable point to the first stable point, an exciting current is supplied to the backward driving coil 8 and is opposite to the magnetic flux of the mover 2 in the holding state and the second gap 28. The magnetic flux is generated in the direction to decrease the holding force, and the magnetic flux in the first gap 27 is increased so as to be larger than the magnetic attractive force in the second gap 28.
For example, as shown in FIG. 2A, when the mover 2 is held at the second stable point, the magnetic circuit S1 is driven so as to generate a magnetic field in the same direction as the magnetic field by the permanent magnets 3 and 4. A current is passed through the return drive coil 8 by the power supply 15. If it does so, the needle | mover 2 will move to the 1st stable point, ie, the position shown in FIG.2 (b), and will be hold | maintained.

  When the mover 2 is moved in the backward direction, the current supplied from the drive power supply 15 is divided into the current flowing through the backward drive coil 8 and the current flowing through the resistor 14, but the resistance value of the resistor 14 is If it is set so as to be an order of magnitude larger than the resistance value of the backward driving coil 8, most of the current flows through the backward driving coil 8, so that it does not hinder the mover 2 from moving in the backward direction. .

  In this way, the mover 2 reciprocates between two stable positions, and the mover 2 is inside the vacuum valve 24 connected via the movable shaft 6 as shown in FIGS. 2 (a) and 2 (b). The movable contact 25 is reciprocated to open and close the power.

In such an electromagnetic operating mechanism 1A, a resistor 14 is connected in parallel with the drive power supply 15 to both terminals of the return drive coil 8, and when an excitation current is passed through the forward drive coil 7, the movable drive coil 8 is in proximity to the return drive coil 8. An induction current that attracts the child 2 and the yoke 11 flows, so that the start of movement of the mover 2 can be delayed. Therefore, a special control circuit is not required, and power switching can be performed simply by changing the resistance value of the resistor 14. The delay time of the device 20 can be easily adjusted.
Further, the existing return drive coil 8 can be used as it is simply by adding a resistor.

In the first embodiment, the permanent magnets 3 and 4 are attached to the mover 2. However, the same effect can be obtained even if the permanent magnets 3 and 4 of the electromagnetic operation mechanism 1 are fixed to the magnetic poles 9 and 10. .
Further, any electromagnetic operation mechanism composed of the yoke 11, the permanent magnets 3, 4, the forward drive coil 7 and the reverse drive coil 8 can be applied regardless of its shape.
Moreover, although the example which uses 1 A of electromagnetic operation mechanisms for power switchgears in Embodiment 1 was demonstrated, 1 A of electromagnetic control mechanisms can be applied similarly to a power switch.

Embodiment 2. FIG.
4 is a cross-sectional view of an electromagnetic operating mechanism according to Embodiment 2 of the present invention.
As shown in FIG. 4, the electromagnetic operating mechanism 1B according to the second embodiment of the present invention is different from the electromagnetic operating mechanism 1A according to the first embodiment in the position where the forward drive coil 7 is disposed. Since the other parts are the same, the same parts are denoted by the same reference numerals and the description thereof is omitted.
The forward drive coil 7 according to the second embodiment is disposed in a gap in the moving direction of the mover 2 between the backward drive coil 8 and the magnetic poles 9 and 10.
The drive power supply 15 is excited by the permanent magnets 3 and 4 and passes an excitation current to the forward drive coil 7 so as to cancel the magnetic flux penetrating the backward drive coil 8. When an excitation current is passed through the forward drive coil 7, the magnetic flux passing through the gap 27 between the end face of the mover 2 and the yoke 11 decreases, but conversely, the resistance 14 is formed in the resistor 14 due to the reduction of the magnetic flux. Since a current that increases the magnetic flux penetrating this gap flows in the closed circuit of the return driving coil 8, the speed at which the magnetic flux decreases is reduced. Then, the time until the suction force for sucking the mover 2 and the yoke 11 in the direction of reducing the interval between the first gaps 27 reaches below the pressing force to the mover 2 biased by the spring, This is longer than when no closed circuit is formed.

  When moving the mover 2 in the backward direction, as in the case of the first embodiment, the exciting current is passed from the drive power supply 15 to the return drive coil 8, so that the mover 2 at the second stable point is moved. Since the magnetic flux by the permanent magnets 3 and 4 penetrating the end portion close to the yoke 11 is canceled and the magnetic flux by the return driving coil 8 penetrating the other end portion of the mover 2 is increased, the second stable The mover 2 moves from the point to the first stable point.

  In such an electromagnetic operation mechanism 1B, even if the forward drive coil 7 is disposed between the magnetic poles 9 and 10 and the backward drive coil 8, the magnetic flux is reduced in the backward drive coil 8 in which a closed circuit is formed by the resistor 14. Since the current that slows the speed of the current flows in the closed circuit, the start of movement of the mover 2 in the forward direction can be easily delayed by simply connecting the reverse drive coil 8 with the resistor 14.

Embodiment 3 FIG.
FIG. 5 is a sectional view of an electromagnetic operating mechanism according to Embodiment 3 of the present invention.
As shown in FIG. 5, the electromagnetic operating mechanism 1 </ b> C according to the third embodiment of the present invention includes an electromagnetic operating mechanism 1 </ b> A according to the first embodiment and a closed circuit via a resistor 14 and a diode 33. The two terminals are different from each other and are the same except for the above. Therefore, the same reference numerals are given to the same parts and the description thereof is omitted.
Both terminals of the reverse drive coil 8 according to the third embodiment are connected via a resistor 14 and a diode 33 connected in series.
In such an electromagnetic operating mechanism 1C, since the diode 33 is inserted in series with the resistor 14, it is not necessary to make the resistance value of the resistor 14 smaller than the resistance value of the backward driving coil 8. The degree of freedom can be increased.
As shown in FIG. 6, the resistor 14 can be omitted by increasing the resistance value of the backward driving coil 8 of the electromagnetic operation mechanism 1D.

Embodiment 4 FIG.
FIG. 7 is a sectional view of an electromagnetic operating mechanism according to Embodiment 4 of the present invention.
The electromagnetic operating mechanism 1E according to the fourth embodiment of the present invention is the same as the electromagnetic operating mechanism 1C according to the third embodiment except that the closed circuit is connected via the resistor 14, the diode 33, and the Zener diode 35 as a variable resistance element. 8 are different from each other in the connection, and the other parts are the same. Therefore, the same parts are denoted by the same reference numerals and the description thereof is omitted.
Both terminals of the return drive coil 8 according to the fourth embodiment are connected via a resistor 14, a diode 33, and a Zener diode 35 connected in series.

  In such an electromagnetic operation mechanism 1E, it is assumed that the power source fluctuates. At this time, there is a case where an induced current is generated and delayed and a case where it is not desired. By adjusting the operating voltage of the Zener diode 35, the delay can be adjusted to be valid / invalid in addition to the effects shown in the first to third embodiments.

Embodiment 5. FIG.
FIG. 8 is a sectional view of an electromagnetic operation mechanism according to Embodiment 5 of the present invention.
In the electromagnetic operating mechanism 1F according to the fifth embodiment, the resistance is not connected to the electromagnetic operating mechanism 1A according to the first embodiment and the backward driving coil 8, and the direction of the excitation current flowing through the forward driving coil 7 is reversed. Since the other parts are the same, the same parts are denoted by the same reference numerals and the description thereof is omitted.

In the electromagnetic operating mechanism 1F according to the fifth embodiment, the direction of the magnetic flux Φ1 of the first magnetic circuit S1 excited by the permanent magnets 3 and 4 is changed from the permanent magnets 3 and 4 to the magnetic poles 9 and 9, as shown in FIG. 10 toward the mover 2 through the yoke body 11a, the yoke lower portion 11b, and the first gap 27 sequentially. Further, the direction of the magnetic flux Φ2 of the second magnetic circuit S2 excited by the permanent magnets 3 and 4 is directed from the permanent magnets 3 and 4 to the magnetic poles 9 and 10, as shown in FIG. It is directed to the mover 2 via the yoke upper part 11c and the second gap 28 in order.
And the magnetic circuit excited by the forward drive coil 7 concerning Embodiment 5 consists of a 3rd magnetic circuit and a 4th magnetic circuit, as shown in FIG. The direction of the magnetic flux Φ3 of the third magnetic circuit T2 is directed from the mover 2 to the yoke upper portion 11c in the second gap 28. Further, the direction of the magnetic flux Φ4 of the fourth magnetic circuit U2 is directed from the yoke lower portion 11b to the mover 2 in the first gap 27.

  Next, the operation of the electromagnetic operation mechanism 1F when increasing the exciting current to the forward drive coil 7 will be described. When the excitation current starts to flow, the magnetic flux Φ3 and the magnetic flux Φ4 increase. At this time, since the magnetic flux Φ4 and the magnetic flux Φ1 in the first gap 27 are directed in the same direction, the magnetic attractive force for attracting the mover 2 to the yoke lower portion 11b increases. Further, since the magnetic flux Φ2, the magnetic flux Φ3, and the magnetic flux Φ4 in the second gap 28 are in opposite directions, the magnetic attractive force that attracts the mover 2 to the yoke upper portion 11c decreases. In this way, when the exciting current is small, the mover 2 is pressed by the yoke lower portion 11b with a strong force.

  Next, when the excitation current is increased, the sum of the magnetic flux Φ1 and the magnetic flux Φ4 passing through the yoke lower portion 11b exceeds the saturation magnetic flux of the yoke lower portion 11b, and therefore the magnetic flux passing through the first gap 27 does not increase. On the other hand, since the magnetic flux Φ3 increases and exceeds the magnetic flux Φ2, the magnetic attractive force for attracting the mover 2 to the yoke upper portion 11c starts to increase.

  When the exciting current is further increased, the magnetic flux passing through the first gap 27 does not increase, but the magnetic flux passing through the second gap 28 increases, and when the predetermined exciting current is reached, the mover 2 is connected. The magnetic attraction force attracted to the yoke upper portion 11c becomes larger than the magnetic attraction force attracted to the iron lower portion 11b, and the mover 2 moves away from the yoke lower portion 11b and starts moving to the yoke upper portion 11c.

  In this way, the magnetic flux passing through the yoke lower portion 11 b excited by the permanent magnets 3 and 4 and the yoke lower portion 11 b in the same direction as the permanent magnets 3 and 4 excited by the exciting current flowing in the forward drive coil 7 are passed. By passing an exciting current through the forward drive coil 7 so that the sum of the magnetic flux exceeds the saturation magnetic flux of the yoke lower portion 11b, the start of the operation of the mover 2 is delayed until the sum of the magnetic fluxes exceeds the saturation magnetic flux, The operating speed can be increased.

It is a figure which shows the structure of the electromagnetic operating mechanism concerning Embodiment 1 of this invention. Sectional drawing of the switchgear for electric power using the electromagnetic operation mechanism of Embodiment 1 is shown. FIG. 6 is an explanatory diagram for explaining the operation of the electromagnetic operation mechanism according to the first embodiment. It is a figure which shows the structure of the electromagnetic operating mechanism concerning Embodiment 2 of this invention. It is a figure which shows the structure of the electromagnetic operating mechanism concerning Embodiment 3 of this invention. It is a figure which shows the structure of the other electromagnetic operating mechanism concerning Embodiment 3 of this invention. It is a figure which shows the structure of the electromagnetic operating mechanism concerning Embodiment 4 of this invention. It is explanatory drawing for demonstrating operation | movement of the electromagnetic operating mechanism concerning Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Electromagnetic operation mechanism, 2 Movable element, 3, 4 Permanent magnet 5, 6 Movable shaft, 7 Forward drive coil, 8 Reverse drive coil, 9, 10 Magnetic pole, 11 yoke, 11a yoke body, 11b lower part of yoke , 11c Upper yoke, 12 Bearing, 13 Housing, 14 Resistor, 15 Drive power source, 20 Power switchgear, 21 Rotation center shaft, 22 Lever part, 23 Contact spring, 24 Vacuum valve, 25 Movable contact, 26 Fixed Contact, 27, 28 Clearance, 30 Spring, 33 Diode, 35 Zener diode.

Claims (6)

A mover having an axis and capable of reciprocating in the axial direction;
A yoke having side surfaces of the mover parallel to the axial direction and surfaces facing both end surfaces of the mover in the axial direction;
A permanent magnet disposed in a closed magnetic circuit composed of the yoke and the mover;
Two or more drive coils arranged around the yoke or the mover;
A power supply for passing an excitation current through the drive coil;
With
A first magnetic circuit from the permanent magnet via the yoke to the mover via one end face of the mover, and the other end face of the mover from the permanent magnet via the yoke In the electromagnetic operating mechanism in which the second magnetic circuit reaching the mover via
The drive coil is
At least one forward drive coil that is excited to move the mover forward;
An electromagnetic operating mechanism comprising: at least one reverse drive coil in which both terminals are electrically connected and an induced current is induced when the forward drive coil is excited.   2. The electromagnetic operating mechanism according to claim 1, wherein both terminals of the return driving coil are connected via at least one of a resistor and a diode.   3. The electromagnetic operating mechanism according to claim 1, wherein both terminals of the return driving coil are connected via a Zener diode.   3. The electromagnetic operating mechanism according to claim 1, wherein both terminals of the return driving coil are connected via a resistance change element. A mover having an axis and capable of reciprocating in the axial direction;
A yoke having side surfaces of the mover parallel to the axial direction and surfaces facing both end surfaces of the mover in the axial direction;
A permanent magnet disposed between the yoke and the mover;
A forward drive coil and a backward drive coil fixed to the surface of the yoke located on both sides of the axial direction of the permanent magnet, relative to the side surface of the mover;
A power source for supplying an exciting current to one of the forward drive coil or the backward drive coil;
With
The first magnetic circuit from the permanent magnet through the yoke, through one end face of the mover, through the center of the return drive coil to the mover, and the yoke from the permanent magnet. Through an electromagnetic operating mechanism in which a second magnetic circuit that passes through the center of the forward drive coil via the other end face of the mover and reaches the mover is configured,
The permanent magnet generates a magnetic flux in a direction opposite to the magnetic flux generated in the second magnetic circuit, and the permanent magnet generates a magnetic flux in the same direction as the magnetic flux generated in the first magnetic circuit. An electromagnetic operating mechanism for controlling an exciting current of the return drive coil so that a sum of magnetic fluxes in a magnetic circuit becomes a magnetic flux exceeding a saturation magnetic flux of the yoke.   A power switch or a power switch using the electromagnetic operating mechanism according to any one of claims 1 to 5.

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