JP2012150899A - Operating device of switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive operating device having stability of quality by one drive coil with weak magnetomotive force, by obtaining suction force of a permanent magnet required during contact of a movable and stationary contacts, minimizing its mass, and stabilizing the magnetomotive force without giving inverse magnetic flux to the permanent magnet as far as possible.SOLUTION: A first movable core with a protrusion is provided on one pole face of a movable permanent magnet, and a similar second movable core is provided on the other pole face. The first and second movable cores and the permanent magnet are integrally reciprocated. A first stationary core part is made to face the first movable core, a second stationary core part is made to face the protrusion of the second movable core in the same direction as the facing direction of the first stationary core part, and a third stationary iron core part is made to face the protrusion of the first movable iron core in a direction opposite to the above direction. At a contact position in a switching device, the sum total of the ratios of gaps between the stationary cores and the movable cores to the cross sections of magnetic paths passing through the gaps are made almost equal to the ratio of the thickness of the permanent magnet to a pole area. A narrow part where saturated magnetic flux density is exceeded is provided in a magnetic circuit of the permanent magnet during closing.

Description

The present invention relates to a magnetic operating device for an opening / closing device.

In the operation device using magnetism of the switchgear, one movable iron core is reciprocated within the yoke, and the movable contact of the switchgear connected to the moveable iron core is opened and closed. In order to maintain the open position or the closed position of the movable contact, the movable iron core of the magnetic material is attracted and held by the magnetic flux of the permanent magnet to the open core or the closed core. A switchgear such as a vacuum circuit breaker requires a stable current-carrying capacity between the movable and fixed contacts in the closed position, so that the movable contact is applied so that a contact load acts during the contact between the movable and fixed contacts. The contact pressure spring device coupled to the contact pressure spring device is provided, and the permanent magnet is attracted against the spring load of the contact pressure spring device to maintain the closed position.

During the opening operation, in addition to the spring load in the opening direction, an attractive force is applied in the opening direction by the opening drive coil of the operating device, and a reverse magnetic flux is applied to the magnetic flux generated by the permanent magnet, thereby closing the permanent magnet in the closing direction. Reduce suction.

Since the spring load or the like does not act on the holding force for holding the open state at the open position, the attractive force of the permanent magnet may be smaller than the attractive force at the time of contact with the movable / fixed contact. Therefore, conventionally, an attractive force is adjusted by providing an air gap or a magnetic air gap intervening with a non-magnetic material in a magnetic circuit of a permanent magnet in an open circuit state.

During the closing operation, an attractive force is applied in the closing direction by the closing drive coil of the operating device, and a reverse magnetic flux is applied to the magnetic flux generated by the permanent magnet to reduce the attractive force in the opening direction of the permanent magnet.

Patent 4515976.

A conventional magnetic operating device of a switchgear is configured as described above, and improvements such as adjusting a suction force by providing a magnetic gap by a permanent magnet or a magnetic gap by interposition of a nonmagnetic material are made. However, in consideration of mechanical rebound due to a collision at a closed position or slow operation in manual operation, the permanent magnet's attractive force is always applied to the spring of the contact pressure spring device during the contact of the movable / fixed contact. Although it is necessary to close the circuit reliably exceeding the load, the conventional switchgear does not consider minimization of the permanent magnet in accordance with the function of the switchgear.

The magnetoresistance of the permanent magnet's magnetic circuit increases with operation both during opening and closing, and the magnetic flux of the drive coil flows as a reverse magnetic flux to the permanent magnet itself with a small internal magnetic resistance. I am worried about the deterioration. In particular, the thinner the permanent magnet is designed to reduce the internal magnetic resistance, the larger the reverse magnetic flux flows through the permanent magnet itself.

In the open circuit state, there is a large gap between the movable core and the stationary core on the closing side, and there is a magnetic gap between the movable core and the stationary core on the opening side, and the magnetic circuit of the drive coil for closing that attracts the movable core to the closing side Therefore, in order to obtain a large operating force during the closing operation, a closing drive coil having a large magnetomotive force is required.

At the time of the opening operation, the magnetic resistance of the magnetic circuit of the opening drive coil is similarly large, and thus a large magnetomotive force opening drive coil is required to obtain a large operating force.

The conventional operating device switches the energization and excitation direction of the drive coil and opens and closes with one drive coil for open circuit or close circuit, even though it can constitute an effective magnetic circuit for one operation, In the other operation, the magnetic flux of the drive coil flows as a reverse magnetic flux to the permanent magnet itself with a small internal magnetic resistance and the attractive force of the permanent magnet is reduced, but it does not flow so much to the operating side with a large magnetic resistance, and the drive is sufficient for operation. It was difficult to obtain the attractive force of the coil.

Considering the function of the switchgear, the mass of the permanent magnet is minimized, the reverse magnetic flux applied to the permanent magnet itself is minimized, the magnetomotive force is stabilized, and the magnetomotive force of the closing drive coil is minimized. An operating device is required. It is desirable to use only one drive coil and to make it cheaper. The present invention has been made to meet such demands, minimizing the mass of the permanent magnet, stabilizing the magnetomotive force of the permanent magnet without applying a reverse magnetic flux to the permanent magnet as much as possible during operation, and opening and closing the circuit. It is an object of the present invention to provide an inexpensive and quality-stable operating device that can be configured by a single drive coil having a small magnetomotive force that is also used for both.

In the operating device according to the present invention, since the two movable iron cores and the permanent magnet are reciprocated, the problem is solved by a structure different from the conventional example in which the permanent magnet is fixed.

The structure of the operating device according to the present invention is as follows. A first movable iron core having a protrusion is provided on one magnetic pole surface of the permanent magnet, and a second movable iron core having a protrusion is provided on the other magnetic pole surface. A reciprocating drive shaft mechanically connected to a drive object such as a movable contact of an opening / closing device, a first movable iron core, a second movable iron core, and the permanent magnet are integrated.

The first fixed core part, the second fixed core part, and the third fixed core part, each of which is magnetically coupled, are used as the fixed core, and the drive coil is the first fixed core part or the third fixed core. It arranges on the outer peripheral side of the part. The first fixed core is opposed to the first movable core, the second fixed core is opposed to the protruding portion of the second movable core in the same direction as the facing direction, and the third fixed core is It is made to oppose the protrusion part of a 1st movable iron core in the opposite direction to an opposing direction.

One drive coil is used for both open circuit and closed circuit. When the circuit is closed, a current is applied to the drive coil used for the open circuit to reversely excite it.

In the present invention, in view of providing the attractive force of the permanent magnet exceeding the spring load of the contact pressure spring device at the time of contact of the movable / fixed contact, which has not been conventionally considered as a function of the opening / closing device, By mathematically differentiating a simple calculation formula for the attractive force of the permanent magnet, the condition for obtaining the attractive force by the mass of the minimal permanent magnet was derived. When the movable / fixed contact is in contact, the magnetic circuit of the permanent magnet is provided with two gaps consisting of a movable iron core and a fixed iron core in series, and the cross-sectional area of the magnetic magnetic path passing through each gap and the permanent magnet thickness Optimize the pole area relationship.

That is, the first gap between the first movable iron core and the first fixed iron core portion and the second gap between the second fixed iron core portion and the second movable iron core protruding portion are substantially equal to each other, And the ratio of the cross-sectional area of the magnetic magnetic path passing through the gap and the ratio of the cross-sectional area of the second magnetic gap and the magnetic magnetic path passing through the gap to the ratio of the thickness of the permanent magnet and the magnetic pole area. Almost equal to

In addition, in order to reduce the excessive attractive force of the permanent magnet at the closed position and enable operation even when the magnetomotive force of the drive coil is small during the opening operation, the fixed iron core, the first movable iron core, or the second movable iron core A narrow part is provided in a part of the iron core. The magnetic material in the narrow portion does not exceed the saturation magnetic flux density when the movable / fixed contact is in contact, and the magnetic material in the narrow portion exceeds the saturation saturation magnetic flux density at the closed position. At the closed position, the magnetic resistance of the narrow portion is increased, the attractive force acting in the closing direction of the permanent magnet is reduced, and the load of the contact pressure spring acting in the opening direction is approached, so that the opening operation can be performed with a drive coil having a small magnetomotive force. The reverse excitation magnetic flux of the drive coil to the permanent magnet is also reduced.

In the operating device according to the present invention, at the time of the closing operation, by attracting the drive coil used for opening the circuit by flowing a current in reverse, an attractive force is obtained in the closing direction by the magnetomotive force of the driving coil, and the opening circuit is opened. The operating device can be constituted by a single drive coil that is used both for use and for closing. Further, the magnetic flux of the drive coil does not reversely excite the permanent magnet itself as much as possible during operation, and the magnetomotive force of the permanent magnet can be stabilized.

The first gap between the first movable iron core and the first fixed iron core and the second gap between the second fixed iron core and the projecting portion of the second movable iron core are substantially equal to each other, and the first gap And the ratio of the cross-sectional area of the magnetic magnetic path in the first gap and the ratio of the cross-sectional area of the magnetic magnetic path in the second gap and the second gap to the ratio of the thickness of the permanent magnet to the magnetic pole area. Therefore, the attraction force at the time of contact with the movable / fixed contact can be obtained by the volume / mass of the minimal permanent magnet.

Further, by providing a narrow portion in the fixed iron core, the first movable iron core, or the second movable iron core, the excessive attractive force by the permanent magnet can be reduced at the closed position, so that there is less from the drive coil during the opening operation. It can be operated with magnetic flux, and the magnetomotive force of the drive coil can be reduced.

By adopting the structure as described above, the present invention can minimize the mass of the permanent magnet, can be constituted by one drive coil that is used for both open circuit and closed circuit, can reduce the magnetomotive force of the drive coil, and can be operated. In some cases, the magnetomotive force of the permanent magnet can be stabilized without applying the reverse magnetic flux generated by the drive coil to the permanent magnet as much as possible. Therefore, an inexpensive and stable operation device can be provided.

It is the perspective view which notched the frame of the operating device by this invention, and showed the internal structure. It is sectional drawing of the operating device of FIG. 1 by this invention, The right side is a longitudinal cross-sectional view seen centering on the longitudinal direction of the 1st movable iron core, The left side is a longitudinal cross-section seen centering on the longitudinal direction of the 2nd movable iron core. The figure is shown. In addition, the parallel oblique line which shows a cut surface is not drawn. The top view of the movable part of the operating device which consists of the 1st movable iron core of FIG. 1 by this invention, a 2nd movable iron core, a permanent magnet, a drive shaft, etc. is shown. The longitudinal cross-sectional view of the closed position of the operating device seen similarly to FIG. 2 is shown. The longitudinal cross-sectional view of the open circuit position of the operating device seen similarly to FIG. 2 is shown. The longitudinal cross-sectional view of the contact position of the movable / fixed contact of the operating device viewed in the same manner as in FIG. 2 is shown. It is a schematic diagram which shows the magnetic flux of the position corresponding to FIG. It is a schematic diagram which shows the magnetic flux of the position corresponding to FIG. It is a schematic diagram which shows the magnetic flux of the position corresponding to FIG. It is the longitudinal cross-sectional view seen similarly to FIG. 2 of the other example of the operating device by this invention which has arrange | positioned the drive coil to the outer peripheral side of the 3rd stationary iron core part. It is a longitudinal cross-sectional view of the other example of the operating device by this invention which made the longitudinal direction of the 1st movable iron core and the longitudinal direction of the 2nd movable iron core the same direction. In addition, the parallel oblique line which shows a cut surface is not drawn. It is sectional drawing of the operating device of the application example shown similarly to FIG.

1, 2, and 3, the movable portion of the operating device is in contact with one of the magnetic pole surfaces of the permanent magnet 1 and the permanent magnet 1, and the first movable iron core 2 of the magnetic body having the protruding portion 2 a and the permanent magnet. A non-magnetic material that is in contact with the other magnetic pole surface of 1 and is in contact with the second movable iron core 3 of a magnetic material having a protrusion 3a, a non-magnetic drive shaft 4 such as stainless steel or copper alloy, and the first movable iron core 2. The movable portion of the operating device is driven through the stopper 8, the fixing member 8a such as a roll pin for fixing the drive shaft 4 and the stopper 8, the disc spring connected to the second movable iron core 3, the spring 10 such as rubber, and the washer 9. It consists of a fixing member 9a such as a roll pin that prevents the shaft 4 from coming off, a rod end 19 that is connected to a driving object of the opening / closing device, and the like. An auxiliary switch, an open / close display device, etc., not shown, are connected to the lower end of the drive shaft 4 in the figure.

The effect of the permanent magnet 1 is the same even if a plurality of permanent magnets are arranged in parallel. The shape of the permanent magnet 1 may be various such as a disk shape or a rectangular plate shape. The spring 10 prevents rattling of the permanent magnet 1 and alleviates impact during opening and closing operations. The movable iron cores 2 and 3 may be configured by stacking thin plates. Further, a tape is wound around the drive shaft 4 so that local stress is not applied to the penetrating portion of the drive shaft 4 of the permanent magnet 1 to cause damage. In order to prevent direct impact on the permanent magnet during the closing operation, the first movable iron core 2 and the protruding portion 2a are connected to the first fixed iron core portion 5 at the contact position between the stopper 8 and the first fixed iron core portion 5. A minute gap is provided between them so as not to contact the second fixed iron core portion 6.

The drive coil 7 is disposed on the outer peripheral side of the first fixed iron core portion 5, and the first fixed iron core portion 5 is fixed to an end plate 12 of a magnetic material with a bolt or the like. The drive coil 7 is sandwiched and fixed between the first fixed iron core portion 5 and the end plate 12, but a rubber sheet, a disc spring, and a wave spring (not shown) are not provided so that excessive stress is not applied. And an elastic member such as a leaf spring. The second fixed core portion 6 and the third fixed core portion 11 are fixed to an end plate 12 that is a yoke. The magnetic end plate 12 may be formed by stacking a plurality of thin plates, and may also be used as a yoke as another magnetic body structure. The end plate 12 and the end plate 14 are fixed with a screw rod or the like with the frame 13 in between, and surround the main parts such as the movable iron core, fixed iron core, permanent magnet, and drive coil of the operating device so that foreign matter does not enter the inside. is doing. The frame body 13 and the end plate 14 prevent the influence of an external magnetic body or the like as a magnetic body, but may be non-magnetic. Although dimensional accuracy is required for the frame 13 and the end plate 14, it is expensive, but the second fixed core portion 6 and the third fixed core portion 11 are fixed to the magnetic frame 13 and the magnetic end plate 14. You can also The frame 13 is a square, and the projecting portions 2a and 3a of the movable iron core are arranged toward the corners of the square frame 13 to take a distance from the frame 13 and reduce the influence of leakage magnetic flux therebetween. ing. The bearing 15 guides the drive shaft 4 and is made nonmagnetic so that minute foreign matter of the magnetic material is attracted by the magnetic force of the permanent magnet 1 and does not get caught in the bearing 15. A part of the drive shaft 4 is circular, and a seal member 15 a is provided so that minute foreign matter is not further caught in the bearing 15. When there are few foreign matters, the end plate 14 may be used as a bearing, the bearing 15 may be eliminated, and the seal member 15a is not necessary.

The first fixed core portion 5 faces the first movable core 2, the second fixed core portion 6 faces the protruding portion 2 a of the second movable core 2 in the same direction as this facing direction, and the third The fixed iron core portion 11 is disposed opposite to the protruding portion 2a of the first movable iron core 2 in a direction opposite to the facing direction.

The protruding portion 2a of the first movable iron core 2 is not mechanically interfered with the second fixed iron core portion 6 and the protruding portion 3a of the second movable iron core 3 is mechanically interfered with the third fixed iron core portion 11 during the reciprocating motion. The projecting portions 2 a of the first movable iron core 2 and the projecting portions 3 a of the second movable iron core 3 are shifted in the projecting direction. In the example of the present invention, they intersect at a substantially right angle. In FIG. 2, the projecting portions 2a and 3a of the movable iron cores 2 and 3 are distributed to two locations on both sides, and the opposing second fixed core portion 6 and third fixed core portion 11 are also distributed to two locations. However, as long as there is no mechanical interference during the reciprocating motion, the number of parts to be divided may be any number and may not be divided as one place.

As shown in FIG. 2, the drive shaft 4 is connected to the contact pressure spring device 16 and the movable contact 17 via a link mechanism (not shown). The contact pressure spring device 16 is provided with a contact pressure spring 16a formed of a compression coil spring. From the contact position of the movable contact 17 to the fixed contact 18 to the closing completion position, the initial load of the contact pressure spring 16a is terminated. A large spring force acts on the load.

4a, the first movable iron core 2 is attracted to the first fixed iron core portion 5 by the magnetomotive force of the permanent magnet 1, and the protruding portion 3a of the second movable iron core is the second fixed iron core. It is sucked by the portion 6 and sucked and held at the closed position against the final load of the contact pressure spring 16a. FIG. 5 a shows the flow of magnetic flux by the permanent magnet 1 in the direction of the solid thick arrow.

FIG. 5a shows the flow of magnetic flux by the drive coil 7 during the opening operation in the direction of the broken-line thick arrow. The drive coil 7 is excited to flow in a direction that cancels out the magnetic flux from the permanent magnet 1 to reduce the magnetic flux, and the attractive force of the first movable iron core 2 and the first fixed iron core portion 5 and the second movable iron core The suction force in the closing direction of the protrusion 3a and the second fixed iron core 6 is reduced. Due to the magnetic flux from the drive coil 7 from the projecting portion 2a of the first movable core 2 to the third fixed core portion 11, a suction force in the opening direction acts on the projecting portion 2a of the first movable core, and the suction force and The circuit opens by the spring load of the contact pressure spring.

In the open position in FIG. 4b, the projecting portion 2a of the first movable iron core is attracted to the third fixed iron core portion 11 by the magnetomotive force of the permanent magnet 1, and is attracted and held at the open position. FIG. 5b shows the flow of magnetic flux by the permanent magnet 1 in the direction of the solid thick arrow. The projecting portion 3a of the second movable iron core is attracted to the second fixed iron core portion 6 by the magnetic flux of the permanent magnet 1, but the projecting portion 3a of the second movable iron core 3 and the second fixed iron core portion 6 are attracted. The suction force is small because the distance to is large. Magnetic flux also flows from the end plate 14 to the second movable iron core 3, but since the distance between them is large, the attractive force in the opening direction is small.

FIG. 5b shows the flow of magnetic flux by the drive coil 7 during the closing operation in the direction of the broken-line thick arrow. The drive coil 7 is excited in the reverse direction of the opening operation, and the magnetic flux flowing in the direction of canceling out the magnetic flux flowing through the first movable iron core protruding portion 2a and the third fixed iron core portion 11 by the permanent magnet 1 is reduced to reduce the magnetic flux, The attractive force in the opening direction is reduced, and the magnetic flux generated by the magnetomotive force of the drive coil 7 is caused to flow from the first movable iron core 2 to the first fixed iron core portion 5 so that the movable iron core 2 is attracted in the closing direction and the closing operation is performed. To do. Since the magnetic flux generated by the drive coil 7 does not flow in the direction of demagnetizing the permanent magnet 1 itself from the beginning to the end of the closing operation, the permanent magnet 1 itself is reversely excited and the permanent magnet 1 is not deteriorated.

In the closing operation, the larger the cross-sectional area of the magnetic path in the gap between the first movable iron core 2 and the first fixed iron core portion 5, the smaller the magnetic resistance and the larger the magnetic flux from the drive coil 7. Magnetomotive force can be reduced.

At the open position, the larger the gap between the end plate 14 and the second movable iron core 3, the greater the magnetic resistance between them, and the permanent magnet flowing from the protruding portion 2 a of the first movable iron core to the third fixed iron core portion 11. The magnetic flux from 1 is reduced. In the closing operation, if the magnetic flux flowing from the permanent magnet 1 to the projecting portion 2a of the first movable core and the third fixed core portion 11 becomes small, the magnetic flux from the drive coil 7 flowing in the direction to cancel it may be small. . That is, the magnetomotive force of the drive coil 7 can be reduced. The magnetic flux flowing from the protruding portion 2a of the first movable iron core to the third fixed core portion 11 is reduced. However, if the cross-sectional area of the magnetic path therebetween is reduced, sufficient open circuit holding force by the permanent magnet 1 can be obtained. Therefore, it is desirable to increase the gap between the end plate 14 and the second movable iron core 3. Although it is one method to make the end plate 14 a non-magnetic material, it is necessary to consider not arranging a magnetic material or the like in the vicinity below the end plate 14.

In a normal closing operation, the movable / fixed contact shown in FIG. 4c does not stay at the contact position due to the inertial force of the driven object such as the movable contact of the switchgear. However, it may be possible to return to the opening direction due to a collision at the closing position and mechanical repulsion in the closing operation, and it may be possible to close the circuit slowly by a manual closing operation. It is necessary to reliably operate to the fully closed position with only the magnetic flux. Since the drive coil 7 is not energized because the auxiliary switch is turned off, it is not possible to expect a suction force in the closing direction of the first movable iron core 2 and the protruding portion 3a of the second movable iron core by the drive coil 7.

In FIG. 5c, the flow of magnetic flux by the permanent magnet 1 at the contact position is shown in the direction of the solid thick arrow. Magnetic flux flows from the first movable iron core 2 to the first fixed iron core portion 5 due to the magnetomotive force of the permanent magnet 1, and the space therebetween is attracted and the second movable iron core 6 projects from the second movable iron core 6. Magnetic flux flows to the part 3a, and the space is attracted. The contact pressure spring 16a must be attracted in the closing direction with a suction force equal to or greater than the initial load in the opening direction.

In FIG. 5c, the magnetic pole area of the permanent magnet 1 is Am, and its thickness is Lm. A first gap between the movable core 2 and the first fixed core portion 5 and Lw, the cross-sectional area of the magnetic path which faces in the gap Lw A to _1. The gap between the second and the fixed iron core portion 6 second protruding portion 3a of the movable iron core and Lw, the cross-sectional area of the magnetic path which faces in the gap Lw and A _2. When the opposing location of the 2nd fixed iron core part 6 and the protrusion part 3a of the 2nd movable iron core is divided | segmented in parallel in several places, it is set as the total area. In the example of the present invention, since it is divided in two places in parallel, it is the total area of the two places. The gap between the first movable iron core 2 and the first fixed iron core 5 and the gap between the second fixed iron core 6 and the projecting portion 3a of the second movable iron core maximize the suction force. Generally, they are almost the same.

Ignores the saturation and leakage flux of the iron core and approximates the magnetic field of the iron core to zero. The magnetic permeability of the permanent magnet 1 is set to μ ₀ equal to the magnetic permeability of the air gap. Let the residual magnetic flux density of the permanent magnet 1 be Br. The magnetomotive force Vm of the permanent magnet 1 is Lm · Br / μ ₀ . The internal magnetic resistance Rm of the permanent magnet 1 is Lm / (μ ₀ · Am), and the magnetic resistance R _{1 in} the gap between the first movable iron core 2 and the first fixed iron core portion 5 is Lw / (μ ₀ · A ₁ ), the magnetic resistance R ₂ of the gap between the second fixed iron core portion 6 and the protrusion 3 a of the second movable iron core is Lw / (μ ₀ · A ₂ ). The magnetic flux φ at this time is as follows.

The attractive force F of the permanent magnet 1 is expressed by the following equation ( ₂ ). If F is differentiated by (Lw / A ₁ + Lw / A ₂ ) and set to zero, the conditional equation of equation (3) that maximizes F is obtained. Is obtained.

When this condition is set, the suction force F is as follows.

That is, when the design is such that Lw / A ₁ + Lw / A ₂ = Lm / Am, the attractive force F is maximized, and the attractive force F at the gap of Lw is the residual magnetic flux density Br and volume Lm of the permanent magnet 1. -Am, that is, determined by mass.

As described above, the larger the first movable iron core 2 is a cross-sectional area A ₁ of the magnetic path of the gap of the first fixed core portion 5, it is possible to reduce the magnetomotive force of the drive coil 6 during closing operation. In the position of Figure 5c, the cross-sectional area A ₂ of the magnetic path is as small as possible, it is desirable to increase the A _1.

When the circuit is closed to the fully closed position, the magnetic flux generated by the permanent magnet 1 is double that of the movable / fixed contact, and the attractive force is quadrupled. In the fixed core of the magnetic magnetic path, or the first movable core 2 or the second movable core 3 is provided with a narrow portion exceeding the saturation magnetic flux density of the material at the closed position, and the length of the narrow portion is adjusted. The magnetic flux by the permanent magnet 1 in the closed position can be reduced. In order to avoid an excessive attractive force of the permanent magnet 1 at the closed position, the closed force can be secured by using the minimum required attractive force of the permanent magnet 1 against the final load of the contact pressure spring 16a at the closed position. At the time of the opening operation, it can be operated with a small magnetic flux from the drive coil, and not only the magnetomotive force of the drive coil can be reduced, but also the reverse excitation magnetic flux to the permanent magnet is reduced and it is difficult to affect the deterioration of the permanent magnet 1 itself.

As shown in FIG. 1, a narrow portion 6a is provided in the second fixed core portion 6 so that the saturation magnetic flux density is not exceeded at the contact position, but at the closed position, the saturation magnetic flux density is exceeded at the narrow portion 6a. The magnetic resistance is increased to reduce the attractive force of the permanent magnet 1, and the reverse excitation magnetic flux from the drive coil 7 to the permanent magnet 1 during the opening operation is reduced.

FIG. 6 shows another example according to the present invention. The drive coil 7 is disposed not on the outer peripheral side of the first fixed core portion as shown in FIG. 1 but on the outer peripheral side of the third fixed core portion. The principle of attraction by the magnetic flux of the permanent magnet 1, the attraction by the magnetic flux of the drive coil 7 and the reduction of the attraction force of the permanent magnet 1 are the same, and the purpose, means and effect are the same. At the time of the opening operation, the attracting force by the permanent magnet 1 in the closing direction of the projecting portion 3a cannot be reduced by the drive coil 7, but the attracting force in the closing direction by the permanent magnet 1 of the first movable core portion 2 becomes small, and the projecting portion The opening operation is performed by the suction force in the opening direction 2a and the load of the contact pressure spring 16a. In the closed position, the magnetic flux generated by the drive coil 7 does not flow to the permanent magnet 1 itself. During the closing operation, the drive coil 7 reduces the attractive force in the opening direction of the protrusion 2a by the permanent magnet 1, and the closing force is applied to the first movable iron core 2 to perform the closing operation. During the closing operation, the magnetic flux generated by the drive coil 7 also flows through the magnetic circuit via the first movable iron core 2, the permanent magnet 1, the second movable iron core 3, and the second fixed iron core portion 6. A little reverse excitation.

Further, as shown in FIG. 7, the distance between the protruding portion 2a of the first movable iron core 2 and the protruding portion 3a of the second movable iron core 3 is increased, while the second fixed iron core portion 6 and the third fixed iron core 3 are fixed. An iron core portion 11 is provided, and the protruding portion 2a of the first movable iron core 2 is the second fixed iron core portion 6 and the protruding portion 3a of the second movable iron core 3 is the third fixed iron core portion 11 during reciprocating motion. It is designed not to interfere mechanically. Moreover, the 2nd fixed iron core part 6 and the 3rd fixed iron core part 11 are integrated in the front and back. Although the structure is slightly different, the principle of operation, purpose, means and effect are the same as in FIG.

As described above, in the operating device according to the present invention, the first movable iron core having the protrusion is provided on one magnetic pole surface of the permanent magnet, and the second movable iron core having the protrusion is provided on the other magnetic pole surface. It was. A drive shaft mechanically coupled to a drive object such as a movable contact of the switchgear, a first movable iron core, a second movable iron core, and the permanent magnet are integrated. The first fixed core is opposed to the first movable core, the second fixed core is opposed to the protruding portion of the second movable core in the same direction as the opposite direction, and the third fixed core is By making the structure opposed to the projecting portion of the first movable iron core in the opposite direction to the facing direction, the closing operation can be performed by exciting the driving coil used for opening the circuit in reverse, so that one driving coil can be obtained.

The first gap between the first movable iron core and the first fixed iron core and the second gap between the second fixed iron core and the projecting portion of the second movable iron core are substantially equal, and the first gap The sum of the ratio of the cross-sectional area of the magnetic magnetic path in the first gap and the cross-sectional area of the magnetic magnetic path in the second gap and the second gap is the ratio of the thickness of the permanent magnet to the magnetic pole area. By making them substantially equal, the attractive force of the permanent magnet required when the movable / fixed contact is brought into contact can be obtained with the volume and mass of the extremely small permanent magnet.

In addition, by providing a narrow portion in the fixed iron core, the first movable iron core, or the second movable iron core, the excessive attractive force by the permanent magnet at the closed position can be reduced, so the magnetomotive force of the drive coil during the open circuit operation The reverse excitation magnetic flux to the permanent magnet can be reduced.

In addition, by accommodating the main part of the operating device in a rectangular frame in the magnetic body, the space is effectively utilized, and a measure for improving the quality stability by eliminating the influence of foreign substances and external magnetic bodies is also shown.

  An application example of the present invention is shown in FIG. 4a, 4c, 5a, 5c, and the principle of the closed position and the contact position, the third fixed core portion 11 corresponds to the second fixed core portion 6 at the open position, If the fourth fixed iron core portion 21 having the drive coil 20 for closing is provided in the periphery so as to face the second movable iron core, the same function as the closing position can be obtained even at the open position. When the distance between the open circuit and the closed circuit is large, that is, when the reciprocating distance of the movable iron core is large, the suction force between the projection 2a of the first movable iron core and the third fixed iron core 11 is small in the open circuit operation. However, the permanent magnet 1 is composed of the first movable iron core 2, the first fixed iron core portion 5, the second fixed iron core portion 6, and the projecting portion 3 a of the second movable iron core. If the attraction force due to is reduced by the drive coil 7, the energy due to the load of the contact pressure spring is mainly applied to open the circuit. Similarly, if the spring 22 corresponding to the contact pressure spring 16a is provided even in the closed position and the attractive force in the opening direction of the permanent magnet 1 is reduced by the closing drive coil 20, the spring 22 corresponding to the contact pressure spring is reduced. The closing operation can be performed by the load, the operation is performed close to the closing by the inertial force of the driving body, and the closing operation is performed by the attractive force of the permanent magnet 1 in the closing direction. Two coils of the opening drive coil 7 and the closing drive coil 20 are required, and the spring 22 corresponding to the contact pressure spring is required at the open position, but even if the distance between the open circuit and the close circuit is large, the contact pressure spring 16a or a spring 22 corresponding to a contact pressure spring mainly acts to open and close by the inertial force of the driving body during the operation, and when it is close to the open position and the closed position, the complete open position by the attractive force of the permanent magnet 1; It is sucked up to the closed position, and the holding force of the open position and the closed position can be obtained.

  For example, even if there is no contact pressure spring that acts in the opening direction at the closed position, such as a disconnector, if a spring corresponding to the contact pressure spring is attached and a spring corresponding to the contact pressure spring is attached even at the open position During the operation, the load such as contact friction for energizing the movable contact can be reduced, so that it can be operated by the inertial force of the driving body operated by the spring corresponding to the contact pressure spring. Holding force can be obtained by suction force. If the present invention is applied, two drive coils, that is, an open-circuit drive coil and a close-circuit drive coil are required for opening and closing operations, but two small magnetomotive force drive coils and one small mass start-up coil are required. It is possible to provide an inexpensive operation device for a disconnector that can be operated with a permanent magnet.

Although the operation device of the switchgear according to the present invention has been shown as an example used for opening and closing a power switchgear, if there is a spring corresponding to the contact pressure spring of the switchgear or if it is attached, it can be used for the operation of other devices. Widely applicable.

1 Permanent magnet
2 First movable iron core
2a Projection part 3 of the first movable iron core Second movable iron core
3a Projection part of second movable iron core
4 Drive shaft
5 First fixed iron core
6 Second fixed core
6a Narrow part 7 Drive coil
11 Third fixed iron core part 16 Contact pressure spring device
17 Movable contact
18 Fixed contact

Claims (3)

An operating device having a drive coil and a permanent magnet, wherein the operating device has a fixed core composed of a first fixed core, a second fixed core, and a third fixed core, and each fixed An iron core is magnetically coupled, and a first movable iron core having a protruding portion protruding from the magnetic pole surface of the permanent magnet on one magnetic pole surface of the permanent magnet, and the other magnetic pole of the permanent magnet A second movable iron core having a protrusion protruding from the magnetic pole surface of the permanent magnet on the surface, the first fixed iron core portion facing the first movable iron core, The fixed core portion faces the protruding portion of the second movable core in the same direction as the facing direction, and the third fixed core portion faces the protruding portion of the first movable core in the opposite direction to the facing direction. The drive shaft connected to the drive object of the switchgear and the first movable Mechanically operated device of the switchgear, characterized in that an integral mind and the second movable iron core and the permanent magnet. From the permanent magnet, the first movable iron core, the first gap between the first movable iron core and the first fixed iron core, the first fixed iron core, the second fixed iron core, the above The second gap between the second fixed iron core and the projecting portion of the second movable iron core, the second movable iron core, the magnetic flux generated by the permanent magnet in the magnetic circuit up to the permanent magnet, and the first gap. 2. The operating device according to claim 1, wherein the attraction force and the attraction force in the second gap obtain the attraction force of the permanent magnet necessary for the operation of the drive object of the opening / closing device. At the contact position of the fixed contact, the ratio between the first gap and the cross-sectional area of the magnetic magnetic path in the first gap, and the cross-sectional area of the magnetic magnetic path in the second gap and the second gap Of the ratio between the thickness of the permanent magnet and the permanent magnet. Operating system of the switchgear, characterized in that it has substantially equal to the ratio of the area of magnetic pole of. From the permanent magnet, the first movable iron core, the first gap between the first movable iron core and the first fixed iron core, the first fixed iron core, the second fixed iron core, the above The second gap between the second fixed iron core and the projecting portion of the second movable iron core, the second movable iron core, the magnetic flux generated by the permanent magnet in the magnetic circuit up to the permanent magnet, and the first gap. 2. The operating device according to claim 1, wherein the attraction force and the attraction force in the second gap obtain the attraction force of the permanent magnet necessary for the operation of the drive target body of the opening / closing device. Alternatively, an operating device for a switchgear characterized in that a narrow portion exceeding a saturation magnetic flux density is provided in a part of the first movable iron core or the second movable iron core at a closed position of the switchgear.

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