JP4770640B2 - Electromagnetic actuator - Google Patents

Description

  The present invention relates to an electromagnetic operating device for a switchgear.

  Switching devices such as circuit breakers, disconnectors, switches, etc. are equipped with an operating device for performing a breaking or closing operation, and there are various types of operating devices such as an electric spring, a hydraulic type and a pneumatic type. .

  These operating devices have a large number of parts and a complicated link mechanism, and thus the manufacturing cost is high. For this reason, as an operation device that simplifies the link mechanism, for example, an electromagnetic operation device is proposed in which the interrupting spring accumulated at the same time as the closing operation is released by a plunger (movable iron core) that penetrates the excitation coil to disengage the contact. (Patent Document 1). In addition, a plunger type electromagnetic actuator that performs a closing operation and a blocking operation using a plunger that penetrates the closing operation coil and the blocking operation coil has been proposed (Patent Document 2). As described above, the plunger type electromagnet composed of the excitation coil and the plunger and having the principle of moving the plunger by the repulsion between the magnetic flux generated by the excitation coil and the magnetic flux generated by the eddy current in the plunger is an excitation coil. And a large magnetic force with a long gap between the plunger and the plunger.

  Furthermore, the plunger type electromagnet that generates a large magnetic force in the long gap state is used in the long gap state immediately after the start of the operation, and the plate type electromagnet that generates a large magnetic force in the short gap state is used in the short gap state immediately before the completion of the operation. An electromagnetic actuator to be used has been proposed (Patent Document 3).

  In addition, at the start of plunger operation, a delayed excitation coil is used to generate a magnetic flux that cancels the magnetic flux generated by the attractive excitation coil, and the magnetic flux is accumulated to the vicinity of the saturation magnetic flux density in the plunger arranged in the attractive excitation coil. A delay type electromagnet device for reducing the size of an exciting coil has been proposed (Patent Document 4). As shown in FIG. 1, this attraction excitation coil 101 prevents the attraction excitation coil 101 from being moved by the delay excitation coil 102 in order to generate the maximum magnetic force (magnetic force generated near the saturation magnetic flux density) of the coil 101. The attraction operation of the plunger 103 is delayed, and the plunger 103 is attracted by the maximum magnetic force of the attraction exciting coil 101.

  Furthermore, an electromagnetic actuator using an open spring 201, an open coil 202, a closed coil 203, an armature 204, and a permanent magnet 205 has been proposed (Patent Documents 5 and 6). As shown in FIG. 2, this electromagnetic actuator holds the position of the armature 204 by the open spring 201 when the circuit is opened. However, when the closing coil 203 is excited, the armature is driven by the magnetic force of the closing coil 203 and the permanent magnet 205. 204 is moved to enter a closed state, and the closed state is maintained by the permanent magnet 205.

JP-A-5-234475 Japanese National Patent Publication No. 10-505940 JP 2002-2107026 A JP 2005-353321 A JP 2002-270423 A JP 2005-79909 A

  However, electromagnetic actuators employing such conventional plunger type, flat plate type, plunger flat plate combined type electromagnets, permanent magnets, and springs are all operating devices for vacuum circuit breakers of less than 6 kV class. It has a stroke length of about 10 mm during the peeling operation. However, for example, in a gas circuit breaker or a vacuum circuit breaker having a high voltage class of 6 kV class or more, it is necessary to set the gap between the circuit breakers to 50 mm or more because of its characteristics. Therefore, when applying an electromagnetic actuator to a gas circuit breaker or a vacuum circuit breaker with a high voltage class of 6 kV or higher, it is necessary to extend the operation stroke and increase the operating force. There are the following problems.

  In order to extend the operation stroke and improve the tripping operation force, it is necessary to increase the tripping spring like a car suspension. For example, the open spring 201 shown in FIG. 2 is further enlarged. There is a need. However, such an increase in the size of the spring increases the size of the electromagnetic operating device, which increases the size of the switchgear incorporating the electromagnetic operating device.

  Further, due to such an increase in the size of the tripping spring, a large magnetic force is required for the closing operation, and a closing position holding force after the closing is required. In order to maintain such an insertion position, for example, it is necessary to increase the size of a permanent magnet as shown in FIG. To increase the size of the permanent magnet to maintain the closing position, in addition to the large tripping force required for high voltage class vacuum circuit breakers, etc., the tripping force exceeding the magnetic force of the permanent magnet is required. Become.

  Further, due to the improvement of the operation force as described above, the impact force generated upon the collision of the plunger with the stopper or the like caused by the insertion or removal breaks the permanent magnet and demagnetizes the permanent magnet.

  In addition, the spring characteristics required for the tripping operation require a large restoring force at the start of the tripping, but at the end of the tripping, characteristics such as reducing the restoring force to reduce the impact force. Such a characteristic cannot be realized by a spring having a simple linear spring coefficient.

  Increasing the size of the permanent magnet for holding the input position requires a large force for separating each component from the magnetic force of the permanent magnet during maintenance. Since such a large force is impossible with human power, maintenance cannot be easily performed.

  Therefore, an object of the present invention is to solve the above problems.

  In order to solve the above-described problems, an electromagnetic operating device according to the present invention includes a plunger connected to a shaft held so as to be movable in the direction of closing or closing the opening / closing device, a plunger arranged around the plunger, and the plunger Is moved by the electromagnetic force in the closing direction, and is moved in the blocking direction by switching the magnetic circuit of the permanent magnet which is arranged around the plunger and on the closing direction side of the closing coil and holds the plunger in the closing position. A tripping coil, a yoke that covers the outer peripheral surface of the closing and releasing coils, a nominal iron that stops the movement of the plunger in the closing direction, a restoring force in the blocking direction with respect to the plunger, and the yoke in the blocking direction A plurality of springs arranged at the end, and a permanent magnet arranged between the yoke and the nominal iron, the permanent magnet being pushed when the closing operation is completed. A permanent magnet that generates a permanent magnet magnetic flux when the closing operation is completed in the nanger, yoke, and nominal iron, and the periphery of the plunger, is arranged between the closing and releasing coils, and a gap is formed between the yoke and / or the plunger. A ring-shaped magnetic body having a tripping magnetic flux path formed by a magnetomotive force of a tripping coil together with a plunger and a yoke at the start of the tripping operation; and Provided is a ring-shaped magnetic body that configures a path of a starting permanent magnet magnetic flux changed from a permanent magnet magnetic flux when a closing operation is completed by a starting magnetic flux together with a plunger, a yoke, and a nominal iron.

  Furthermore, in the electromagnetic operating device according to the present invention, the ring-shaped magnetic body has a first magnetic flux at the start of starting that passes through the plunger, the ring-shaped magnetic body, and the yoke by the magnetomotive force of the closing coil and the permanent magnet when the closing operation is started. The path and the path of the second start-up magnetic flux passing through the plunger, the ring-shaped magnetic body, the yoke, and the nominal iron can be configured.

  Moreover, in the electromagnetic operating device according to the present invention, the plurality of springs are arranged opposite to each other around the shaft for each group of the same spring coefficient, and the spring coefficient can be two or more types.

  Further, in the electromagnetic operating device according to the present invention, the blocking direction side of the plunger is a flat plate portion, and when the closing operation is completed, the flat plate portion can come into contact with the yoke. A non-magnetic fixing plate for fixing the nominal iron and a tripping ring that can be inserted between the yoke and the nominal iron. The fixing plate and the tripping ring are permanent when the closing operation formed by the permanent magnet is completed. The magnet magnetic flux can constitute a permanent magnet magnetic flux when a tripping ring made of a yoke and a nominal iron around the fixed plate is inserted.

  In the electromagnetic operating device according to the present invention, a shock absorber for buffering the impact force generated by the plunger at the end of the closing or pulling operation can be disposed around the shaft.

  Furthermore, in the electromagnetic operating device according to the present invention, an auxiliary plunger connected to the shaft held so as to be movable in the shut-off or closing direction of the switchgear, and a return spring having a restoring force in the shut-off direction with respect to the auxiliary plunger The auxiliary plunger can be provided for moving the auxiliary plunger in the closing direction by electromagnetic force.

According to the present invention, in the electromagnetic actuator, there is provided a ring-shaped magnetic body having a gap between the yoke and / or the plunger and disposed between the input and release coils, the ring-shaped magnetic body. When the tripping operation starts, the plunger, ring-shaped magnetic body, the path of magnetic flux passing through the yoke by the magnetomotive force of the tripping coil, and the plunger, ring-shaped magnetic body, yoke by the magnetomotive force of the permanent magnet , And a ring-shaped magnetic body that constitutes the path of the permanent magnet magnetic flux at the start of tripping through the nominal iron, causing a decrease in the holding force, speeding up the shut-off operation, tripping spring, tripping coil Enables miniaturization.
In other words, at the time of tripping, the ring has the ring directly under the tripping coil, so the magnetic circuit length around the tripping coil is shortened, the rise of the current of the tripping coil is accelerated, and the magnetic circuit is removed at high speed when completed. The magnetic flux can be divided into the permanent magnet magnetic flux at the end of the tripping, and the cancellation of the magnetic flux of the permanent magnet at the plunger flat plate portion becomes efficient.

  Further, according to the present invention, the ring-shaped magnetic body is configured such that, at the start of the closing operation, the first winding start magnetic flux path passing through the plunger, the ring-shaped magnetic body, the yoke by the magnetomotive force of the closing coil and the permanent magnet, and Since it is a ring-shaped magnetic body that constitutes a second magnetic flux path at the start of insertion through the plunger, ring-shaped magnetic body, yoke, and nominal iron, the magnetic resistance formed by the magnetic flux path formed in the ring-shaped magnetic body at the start of injection This makes it possible to speed up the closing operation and reduce the size of the closing coil.

  In addition, according to the present invention, in order to improve the tripping operation force, a plurality of springs having different spring coefficients are provided, and a large restoring force is provided at the start of tripping, and an impact force is reduced at the end of tripping. It can have the characteristic of reducing the restoring force.

  Furthermore, according to the present invention, the blocking direction side of the plunger is a flat plate portion, and when the closing operation is completed, the flat plate portion comes into contact with the yoke, so that the magnetic resistance can be lowered.

  The electromagnetic actuator can further buffer the impact force to the permanent magnet by a shock absorber for buffering the impact force generated by the plunger at the end of the closing or pulling operation.

  In addition, at the end of loading, the plunger is pulled by human power by releasing each component from the magnetic force of the permanent magnet by a pulling ring that creates a magnetic circuit between the yoke and the nominal iron by the magnetomotive force of the permanent magnet. be able to.

  Furthermore, by minimizing the length in the longitudinal direction by reducing the size of the spring, by providing a spare coil in the space resulting from the shortening in the longitudinal direction, it is possible to increase the reliability of the closing or pulling operation. Is possible.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 3 shows a cross-sectional view of an electromagnetic actuator according to an embodiment of the present invention. The left side of FIG. 3 shows the electromagnetic actuator in the on state, and the right side shows the electromagnetic operator in the cutoff state.

  The electromagnetic actuator 30 according to one embodiment of the present invention includes a closing coil 6, a tripping coil 7, a bobbin 8 that houses the closing coil 6 and the tripping coil 7, and a middle between the closing coil 6 and the tripping coil 7. A magnetic ring 16 disposed; a plunger (movable iron core) 10 that moves by a magnetic force along the central axis of the bobbin 8; and a shaft 1 that is connected to the opening / closing portion on the central axis of the bobbin 8; A nominal iron 2 that penetrates around the shaft 1 and attracts the plunger 10 by magnetic force, a yoke (fixed iron core) 9 provided so as to cover the upper and lower surfaces and the outer peripheral surface of the closing coil 6 and the releasing coil 7; A tripping spring 11 arranged on the upper surface of the yoke, a spring case 12 for fixing the tripping spring 11 to the plunger, a permanent magnet 5 arranged between the nominal iron 2 and the yoke 9, and a pusher With a stopper 14 for stopping Nja 10 to the blocking position, the stopper pressing member 15 for connecting the stopper 14 and the yoke 9, a.

  Further, the electromagnetic operating device 30 includes a fixing plate 4 for fixing the nominal iron 2 and the yoke 9 and a trip ring 3 used for removing the permanent magnet 5 between the nominal iron 2 and the yoke 9. Further, the electromagnetic actuator 30 is provided with a shock absorber 13 in order to buffer an impact when the plunger 10 collides with the stopper 14 at the time of tripping (blocking).

  In the electromagnetic actuator in the input state shown on the left side of FIG. 3, the plunger 10 is placed in the input position in contact with the nominal iron 2. At this time, the plunger 10 is attracted to the nominal iron 2 by the magnetic force of the permanent magnet 5, and the tripping spring 11 is contracted.

  At the time of shut-off, the plunger 10 moves to the shut-off position as shown on the right side of FIG. 3 by the magnetic force generated in the plunger 10 by exciting the tripping coil 7 and the restoring force of the tripping spring 11.

  When returning to the closed state, in addition to the magnetic force of the permanent magnet 5, the magnetic force generated in the plunger 10 is excited by exciting the closing coil 6 wound in the opposite direction to the winding of the tripping coil 7. Return the plunger 10 to the closing position.

  The bobbin 8 is made of a material having a high magnetic permeability in order to efficiently increase the magnetic flux in the plunger 10 by the magnetic force generated in the plunger 10 by exciting the closing coil 6 and the tripping coil 7. Is preferred. For example, as such a substance, there is a plastic such as a phenol resin.

  FIG. 4 shows a top view of an electromagnetic actuator according to an embodiment of the present invention. As shown in the figure, the electromagnetic operating device 30 arranges the six tripping springs 11 and the two shock absorbers 13 in the spring case 12 so as to face each other.

  Conventionally, in order to improve the tripping force, it has been necessary to increase the tripping spring like a car suspension. However, as shown in the figure, a small spring with a small restoring force (a conventional spring is used). Compared with length: 1/4 to 1/6, diameter: 1/2 to 1/4), the length in the longitudinal direction is minimized and a large pulling operation force is generated. Is possible. As a result, it is possible to reduce the size of the electromagnetic actuator and the switchgear having a high voltage class including the electromagnetic actuator.

  The six tripping springs 11 are divided into at least two to three types of springs having different spring coefficients or free spring lengths. In this way, by providing a plurality of types of springs having a linear spring coefficient, the spring force is reduced when the plunger 10 hits the stopper 14 by relatively increasing the spring coefficient at the start of the trip or at the completion of the trip. Accordingly, it is possible to avoid demagnetization of the permanent magnet due to an impact force generated at the time of a collision with a plunger stopper, a nominal iron, or the like, which is caused by insertion or withdrawal.

  Furthermore, by disposing a plurality of springs having the same spring coefficient oppositely or evenly, it is possible to suppress displacement of the shaft in the horizontal direction due to the displacement of the spring even when springs having different spring coefficients are arranged.

  Thus, the plurality of springs 11 and the shock absorber 13 are made small and integrated (unit) with the plunger 10 by the spring case 12. Further, the tripping spring 11 can obtain a high spring coefficient with a short compression by using a plurality of heterolinear coil springs. Furthermore, by combining the number of springs, the spring length, the wire diameter, and the winding diameter individually, it is possible to easily obtain an optimal spring coefficient for several springs in total.

  FIG. 5 is a diagram showing a magnetic flux at the completion of the electromagnetic actuator input or at the start of the electromagnetic actuator input in the electromagnetic actuator according to the embodiment of the present invention. The left side of FIG. 5 shows the magnetic flux in the non-excited state when the electromagnetic actuator is turned on, and the right side of FIG. 5 shows the magnetic flux in the turned-on coil excitation state when the electromagnetic actuator is started.

  When the electromagnetic actuator is turned on on the left side of FIG. 5, since the making coil 6 is not excited, the permanent magnet magnetic flux 17 flows when the making operation is completed due to the magnetomotive force of the permanent magnet 5. In this magnetic circuit, the magnetic resistance of the flat plate portion of the plunger 10 and the yoke 9 is small, but since the ring 16 has a slight air gap with respect to the plunger 10 and the yoke 9, the magnetic resistance of the path through the ring 16 is Relatively very high. For this reason, when the closing operation is completed, the permanent magnet magnetic flux 17 does not flow through the ring 16 but flows through the flat plate portion of the plunger 10, the yoke 9 and the nominal iron 2.

  Since the closing coil 6 is energized at the start of charging the electromagnetic actuator on the right side of FIG. 5, the permanent magnet 5 and the closing coil 6 generate magnetomotive force, and the closing start magnetic flux 18 flows. In this magnetic circuit, there is no portion where the flat plate portion of the plunger 10 is in contact with the nominal iron 2 as shown in the left side of FIG. 5, so that the magnetic circuit via the ring 16 with an air gap and only the plunger 10 and the yoke 9 are used. A magnetic flux 18 flows through a circuit composed of a magnetic circuit at the start of charging. The magnetic force generated by the permanent magnet 5 and the closing coil 6 moves the plunger 10 while contracting the tripping spring 11, returns the plunger 10 to the closing position, and when the plunger 10 and the nominal iron 2 come into contact, the closing operation is completed. As shown on the left side of FIG. 5, the closing coil 6 is brought into a non-excited state.

  Conventionally, for example, as shown in FIG. 1, the path between the making coil 6 and the tripping coil 7 has been used to cancel each other's magnetic flux in order to generate the maximum magnetic force, so that the shut-off or making operation is performed. Was causing a delay. However, in the electromagnetic operating device according to the present invention, the magnetic circuit via the ring 16 is configured by the ring 16 at the start of charging, thereby reducing the magnetic resistance and generating larger magnetic flux and magnetic force with the same magnetomotive force. As a result, the input speed can be increased.

  In addition, as shown in FIG. 2, conventionally, in order to increase the operating force, speed up, and increase the stroke required for application to a switchgear with a high voltage class, it is necessary to enlarge the tripping spring. Therefore, it is necessary to improve the closing operation force. However, the ring 16 forms a magnetic circuit via the ring 16 at the start of closing, thereby reducing the magnetic resistance and increasing the magnetic flux and magnetism with the same magnetomotive force. A force can be generated, whereby the closing coil 6 can be reduced in size. Further, the reduction of the magnetic resistance also reduces the energy for the making operation by shortening the rise time of the current flowing through the making coil 6 and minimizing the magnetic flux leakage.

  FIG. 6 is a diagram showing the magnetic flux at the start of the electromagnetic actuator tripping or at the completion of the electromagnetic actuator tripping in the electromagnetic actuator according to the embodiment of the present invention. The left side in FIG. 6 shows the magnetic flux in the tripping coil excitation state at the start of the electromagnetic actuator tripping, and the right side in FIG. 6 shows the magnetic flux in the tripping coil excitation state at the completion of the electromagnetic actuator tripping.

  At the start of tripping of the electromagnetic actuator on the left side of FIG. 6, the tripping coil 7 is excited. However, since the permanent magnet 5 also generates magnetic force, the tripping coil 7 is placed in a path via the ring 16. Magnetic flux 19 is generated at the start of removal. On the other hand, as shown in the left side of FIG. 5, the permanent magnet magnetic flux 17 when the permanent magnet 5 at the time of completion of the electromagnetic actuator insertion completion by the magnetomotive force is completed is started to be released via the ring 16 by the generation of the magnetic flux 19 at the start of the separation. The permanent magnet magnetic flux 20 is changed. Since the magnetic circuit of this permanent magnet is a circuit through an air gap, the magnetic resistance is large, so that the permanent magnet magnetic flux 20 at the start of tripping has a lower magnetic flux density than the permanent magnet magnetic flux 17 at the time of closing operation. Thereby, the magnetic force for holding the closing position decreases. Therefore, the magnetic force of the tripping is generated by the excitation of the tripping coil 7, and at the same time, the magnetic force of holding position by the permanent magnet 5 is reduced, so that the magnetic force by the tripping coil 7 and the tripping spring 11 are reduced. The tripping operation starts with the restoring force of. Then, the path of the permanent magnet magnetic flux at the start becomes the permanent magnet magnetic flux 22 at the end of trip that passes through the same path even at the end of the trip operation. At this time, due to the large air gap between the nominal iron 2 and the plunger 10, Since the magnetic force of the permanent magnet 5 is sufficiently smaller than the restoring force of the tripping spring 11, the tripping position is maintained by the tripping spring 11.

  In this way, the magnetomotive force of the tripping coil 7 is generated by the magnetic flux 19 at the start of tripping via the ring 16 to generate a large tripping magnetic force by shortening the magnetic circuit and reducing the magnetic resistance. In addition, the magnetic force of the permanent magnet 5 to the yoke 9 of the plunger 10 is removed from the permanent magnet magnetic flux 17 when the closing operation is completed and changed to the permanent magnet magnetic flux 20 at the start, so Reduce.

  Thus, as shown in FIG. 2, conventionally, in order to increase the operating force, speed up, and increase the stroke required to be applied to a high-pressure switchgear, it is necessary to increase the size of the trip spring. Although it was necessary to increase the size of the magnet that holds the closing position after completion of the closing and to improve the operating force of the releasing, the permanent magnet is generated by the magnetic flux 19 generated by the excitation of the releasing coil 7 generated in the ring 16. By changing the magnetic flux path 5, the magnetic force for holding the closing position is weakened, thereby making it possible to reduce the operating force for tripping.

  Also, as shown in FIG. 1, conventionally, the path between the closing coil 6 and the tripping coil 7 has been used to cancel each other's magnetic flux in order to generate the maximum magnetic force, so that it can be blocked or Although a delay has occurred in the closing operation, in the electromagnetic operating device of the present invention, the operating force at the closing position is changed by changing the magnetic flux path of the permanent magnet 5 by the magnetic flux 19 generated by the excitation of the tripping coil 7 generated in the ring 16. It is possible to shorten the tripping operation time by instantly weakening. Further, the shortening of the operation time caused by the reduction of the magnetic force by the permanent magnet 5 reduces the leakage of magnetic flux and the like, and also reduces the energy for the tripping operation.

  As described above, the ring 16 constitutes a magnetic flux path at the start of charging and reduces the magnetic resistance, thereby enabling a quick closing operation and a reduction in the size of the closing coil 7 and at the time of starting the shut-off permanently. Changing the magnetic circuit by the magnet 5 causes a drop in the holding force, enabling a quicker shut-off operation and a reduction in the size of the tripping coil 6.

  Furthermore, these characteristics can be adjusted by the length of the air gap between the ring 16 and the yoke 9 or the plunger 10. For example, if the air gap between the ring 16 and the yoke 9 or the plunger 10 is increased, the magnetic resistance of the permanent magnet 5 at the start of tripping is increased and the required operating force is reduced in the shut-off operation. Therefore, the magnetic force generated by the tripping coil decreases. Further, in the closing operation, if the air gap between the ring 16 and the yoke 9 or the plunger 10 is increased, the effect of reducing the magnetic resistance due to the paralleling of the magnetic circuit at the start of closing becomes small.

  Therefore, the optimum air gap for downsizing the tripping spring 11, the tripping coil 7, and the closing coil 6 based on the manipulation force, manipulation speed, and stroke that the electromagnetic actuator 30 requires depending on the opening / closing device to be attached. Is selected. For example, based on the operating force required for the switchgear, the operating force of the tripping spring 11 and the tripping coil 7 is first reduced at the time of tripping due to lowering of the magnetic flux density of the permanent magnet magnetic flux path 20 at the time of tripping. An air gap to be realized is obtained, and then, it is examined whether a decrease in the magnetic resistance of the ring 16 affects the downsizing of the closing coil 6 due to the air gap. By optimizing the result of this study from the miniaturization, cost, energy consumption, etc. of the entire electromagnetic actuator, the optimum tripping spring 11, tripping coil 7, and closing coil 6 can be selected.

  Further, no matter how large the gap between the ring 16 and the yoke 9 or the plunger 10 is, the path of the magnetic flux 17 at the time of completion of the application is maintained, and the application position holding force by the permanent magnet 5 is not changed. There are features.

  FIG. 7 is a diagram showing the magnetic flux of the electromagnetic actuator during the trip ring operation according to an embodiment of the present invention. FIG. 7 shows the magnetic flux formed by the permanent magnet 5 in the electromagnetic operating device when the closing is completed. The left side of FIG. 7 represents the permanent magnet magnetic flux 17 when the closing operation by the permanent magnet 5 is completed when the trip ring 3 is detached from the electromagnetic actuator. The right side of FIG. 7 represents the magnetic flux 23 at the time of tripping by the permanent magnet 5 when the tripping ring 3 is fitted in the electromagnetic actuator.

  When the tripping coil 3 is inserted between the nominal iron 2 and the yoke 9 as shown on the right side of FIG. 7, the magnetic flux at the time of tripping with the permanent magnet 5 as the magnetomotive force around the fixed plate 4 made of a nonmagnetic material. A magnetic circuit through which 23 flows is formed. This is because the magnetic circuit around the fixed plate 4 has a lower magnetic resistance than the magnetic circuit passing through the plunger 10. As a result, the magnetic force that attracts the plunger 10 to the nominal iron 2 is eliminated, and the plunger 10 can be removed by human power.

  Conventionally, as shown in FIG. 2, it has been extremely difficult to remove the plunger by human power due to the magnetic force generated by the permanent magnet attached to the electromagnetic operating device. However, in the electromagnetic operating device according to the present invention, the permanent magnet is used. By removing the magnetic circuit 5 by the trip ring 3, the plunger 10 can be manually removed from the electromagnetic actuator.

  FIG. 8 is a cross-sectional view of an electromagnetic actuator with a subcoil according to an embodiment of the present invention. The electromagnetic operating device described above may further include an auxiliary unit including an auxiliary nominal iron 24, an auxiliary closing coil 25, a bobbin 26, an auxiliary plunger 27, and a return spring 28. This auxiliary unit can be used to assist the loading or unloading operation for dealing with anomalies in the event of a malfunction such as when the loading or unloading operation of the plunger 10 does not operate within a predetermined operation time.

  Conventionally, in order to improve the pulling operation force, it has been necessary to increase the pulling spring like a car suspension, but as shown in the figure, by having multiple springs with small restoring force, the longitudinal direction It is possible to minimize the length. By providing the above-mentioned auxiliary unit in the surplus space due to the shortening in the longitudinal direction, it is possible to improve the reliability of the loading or unloading operation.

  As described above, the electromagnetic operating device according to the present invention is smaller than the conventional one and has a fast operation speed of turning on or off, so that it can be easily applied to a switching device having a high voltage class, and the operation reliability is improved. It is something to be made. In addition, such electromagnetic actuators are expected to be applied to a wide range of electrical equipment without being limited to switching devices with a high voltage class, and thus greatly contribute to improving the reliability of electrical equipment as a whole. However, it brings great benefits in the power industry.

  The embodiments described above are merely given as typical examples, and it is obvious to those skilled in the art to combine the components of each embodiment, and variations and variations thereof. Those skilled in the art will understand the principles and claims of the present invention. It is apparent that various modifications of the above-described embodiment can be made without departing from the scope of the invention described in the above.

It is a circuit diagram of the conventional electromagnetic actuator. It is a circuit diagram of the conventional electromagnetic actuator. It is sectional drawing of the electromagnetic operating device by one Embodiment of this invention. It is a top view of the electromagnetic actuator by one Embodiment of this invention. It is a figure which shows the magnetic flux at the time of the completion of electromagnetic actuator input in the electromagnetic actuator by one Embodiment of this invention, or the electromagnetic actuator input start. It is a figure which shows the magnetic flux of the electromagnetic actuator at the time of the trip coil excitation by one Embodiment of this invention. It is a figure which shows the magnetic flux of the electromagnetic actuator at the time of the trip ring operation by one Embodiment of this invention. It is sectional drawing of the electromagnetic actuator with a subcoil by one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft 2 Nominal iron 3 Tripping ring 4 Fixing plate 5 Permanent magnet 6 Closing coil 7 Tripping coil 8 Bobbin 9 Yoke 10 Plunger 11 Tripping spring 12 Spring case 13 Shock absorber 14 Stopper 15 Stopper presser 16 Ring 17 Permanent at completion of loading operation Magnet magnetic flux 18 Magnetic flux at start of release 19 Magnetic flux at start of removal 20 Permanent magnet magnetic flux at start of removal 21 Magnetic flux at completion of removal 22 Permanent magnet magnetic flux at end of removal 23 Magnetic flux of permanent magnet at input position 24 Auxiliary nominal iron 25 Auxiliary input Coil 26 Bobbin 27 Auxiliary plunger 28 Return spring 30 Electromagnetic actuator

Claims (6)

A plunger connected to a shaft held so as to be movable in the closing or closing direction of the switchgear;
A closing coil disposed around the plunger and moving the plunger in the closing direction by electromagnetic force;
A tripping coil that is disposed around the plunger and on the side of the closing direction of the closing coil, and that moves the plunger in the blocking direction by applying an electromagnetic force in a direction that cancels the closing position holding magnetic flux;
A yoke covering the outer peripheral surface of the charging and tripping coil;
Nominal iron that sucks the plunger in the charging direction;
It has a restoring force in the blocking direction with respect to the plunger, and is arranged at the end of the yoke in the blocking direction in the same spring coefficient or oppositely arranged around the shaft, and the spring coefficient is Two or more springs, and
A permanent magnet disposed between the yoke and the nominal iron, the permanent magnet constituting a permanent magnet magnetic flux circuit when the closing operation is completed to the plunger, the yoke, and the nominal iron;
A ring-shaped magnetic body that surrounds the plunger, is disposed between the input and release coils, and has a gap between the yoke and / or the plunger, the ring-shaped magnetic body comprising: By having the gap, a permanent magnet magnetic flux circuit is not formed when the closing operation is completed when the closing operation is completed , and a path of the starting magnetic flux generated by the magnetomotive force of the tripping coil is started when the releasing operation is started. The tripping permanent magnet magnetic flux having a magnetic force smaller than the permanent magnet magnetic flux when the closing operation is completed is constituted with the plunger, the yoke, and the nominal iron. A ring-shaped magnetic material;
An electromagnetic operating device comprising:   The ring-shaped magnetic body is configured such that, at the start of a closing operation, the plunger, the ring-shaped magnetic body, a first magnetic flux path at the start of passing through the yoke by the magnetomotive force of the closing coil and the permanent magnet, and the plunger, ring-shaped The electromagnetic operating device according to claim 1, wherein the electromagnetic operating device is a ring-shaped magnetic body that constitutes a second magnetic flux path at the start of insertion through the magnetic body, the yoke, and the nominal iron. The electromagnetic operating device according to claim 1 or 2 , wherein a side of the plunger in a blocking direction is a flat plate portion, and when the closing operation is completed, the flat plate portion contacts the yoke. The electromagnetic operator further electromagnetic according to buffer for buffering the impact force plunger occurs during up or tripping operation end, in any one of claims 1 to 3, arranged around the shaft Operation device. The electromagnetic operating device further includes an auxiliary plunger connected to a shaft held so as to be movable in a cutoff or closing direction of the opening / closing device, a return spring having a restoring force in the cutoff direction with respect to the auxiliary plunger, and poured auxiliary coil for moving the electromagnetic force auxiliary plunger charging direction, the electromagnetic control device according to any one of claims 1 to 4 with. The electromagnetic operating device further includes a non-magnetic fixing plate that fixes the yoke and the nominal iron, and a trip ring that can be inserted between the yoke and the nominal iron.
2. The fixing plate and the tripping ring constitute a permanent magnet magnetic flux when the closing operation formed by the permanent magnet is completed, and a permanent magnet magnetic flux when a tripping ring made of a yoke and a nominal iron around the fixing plate is inserted. The electromagnetic actuator according to any one of to 5 .

Images