JP4630373B2 - Electromagnet device - Google Patents

Description

【Technical field】
[0001]
The present invention relates to an electromagnet device, and is particularly suitable for application to a switch provided with an exciting coil and a permanent magnet.
[Background]
[0002]
A pair of electrodes are provided inside a switch such as a circuit breaker, and a movable rod is drawn out from one electrode, and the drawn movable rod is connected to a movable shaft to which a mover is attached. Yes. When an exciting current is applied to the exciting coil of the electromagnet device, the mover is driven to the stator side by the magnetic attractive force of the generated magnetic flux. Then, this driving force is transmitted to the movable rod via the movable shaft, and one of the electrodes is brought into contact with the other electrode, whereby the switch is shifted to the on state. As means for maintaining this input state, there are always-excited, mechanical latch and electromagnetic latch.
[0003]
The constant excitation keeps the energized state by always energizing the exciting coil even after the switch is switched to the energized state, and causes an increase in power consumption. The mechanical latch holds the input state by mechanically hooking it with an appropriate structure, etc., and generally requires a complicated form, and suppresses consumption of the drive part such as application of lubricating oil. Maintenance is required.
On the other hand, as disclosed in Japanese Patent Application Laid-Open No. 2002-8498, the electromagnetic latch holds the applied state by the electromagnetic attractive force of the permanent magnet, and is excited when the switch is shifted to the applied state. Power saving can be achieved by stopping the energization of the coil or reducing the energization current.
[0004]
However, in the electromagnetic latch, even when the power is turned off at the time of a power failure or the like, the on state is maintained by the electromagnetic attractive force of the permanent magnet, and the on state is maintained even if the power is turned off. There was a problem that it was not suitable for the field that needed to break the circuit breaker.
On the other hand, in the constant excitation, since the energized state is maintained by always energizing the exciting coil, the circuit breaker can be automatically shut off when the power is turned off at the time of power failure.
However, in the constant excitation, maintaining the input state causes an increase in power consumption, so that there is a problem that it is not suitable for a field that needs to maintain the input state when the power is turned off.
Therefore, an object of the present invention is to provide an electromagnet device that can easily switch between electromagnetic latching and constant excitation without complicating the configuration.
Disclosure of the Invention [0005]
In order to solve the above-described problem, according to an electromagnet device according to an aspect of the present invention, a movable shaft to which a mover is attached, a stator that is inserted into the movable shaft and is capable of contacting and separating from the mover, An excitation coil that is arranged to surround the mover and the stator, and generates a magnetic force that moves the mover in the direction of the stator, and a magnetic force that maintains a contact state between the mover and the stator. A permanent magnet to be generated, a frame that surrounds the excitation coil and the permanent magnet, and that forms a magnetic path for moving the mover in the direction of the stator by the magnetic flux of the excitation coil and the permanent magnet, and the permanent magnet A magnetic short-circuit plate provided to straddle and reduce the amount of magnetic flux generated from the permanent magnet, and when the movable element contacts the stator, the magnetic flux reduced by the magnetic short-circuit plate is reduced. Characterized in that it supplemented with a magnetic coil flux.
[0006]
In addition, according to the electromagnet device according to one aspect of the present invention, the first magnetic plate disposed so as to contact the inner surface of the frame and one pole of the permanent magnet, and the movable element are slidably disposed. And a second magnetic plate disposed so as to contact the other pole of the permanent magnet, and the magnetic short-circuit plate is detachably disposed between the first magnetic plate and the second magnetic plate. It is characterized by that.
Further, according to the electromagnet device according to one aspect of the present invention, the first magnet is disposed so as to contact the inner surface of the frame and to contact one pole of the permanent magnet so as not to contact the mover. A magnetic short circuit comprising: a plate; and a second magnetic plate disposed so as to be slidable with the mover so as not to contact the frame and in contact with the other pole of the permanent magnet. The plate is constructed between the first magnetic plate and the second magnetic plate.
[0007]
In the electromagnet device according to one aspect of the present invention, the permanent magnet and the exciting coil are arranged side by side along the movable shaft, and the permanent magnet includes the first magnetic plate and the second magnetic plate. It is supported in the said frame in the state pinched | interposed between.
Moreover, according to the electromagnet apparatus which concerns on 1 aspect of this invention, the amount of magnetic flux generated from the said permanent magnet is increased / decreased by increasing / decreasing the cross-sectional area of the said magnetic short circuit board.
In the electromagnet device according to an aspect of the present invention, the first magnetic plate and the second magnetic plate have a contact surface with the magnetic short-circuit plate formed in a round shape.
[Brief description of the drawings]
[0008]
FIG. 1 is a cross-sectional view showing a released state of an electromagnet device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a charged state of an electromagnet device according to an embodiment of the present invention.
FIG. 3 is a front view showing the configuration of the electromagnet device when viewed from the direction A2 in FIGS. 1 and 2;
4 is a side view showing the configuration of the electromagnet device when viewed from the direction A3 in FIG. 3; FIG.
[Explanation of symbols]
[0009]
DESCRIPTION OF SYMBOLS 1 Movable shaft 1a Movable screw 1b Movable nut 2 Movable element 2a Gap 3 Stator 3a Support groove 4a Spring groove 5 Cavity 6 Frame 6a Frame end 7 End plate 8 Excitation coil 8a Coil frame 9 Permanent magnet 10a Magnetic path 11, 12 Magnetic Plate 13 Space portion 14 Clamping bolt 15 Clamping nut 16 Magnetic short-circuit plate [Best Mode for Carrying Out the Invention]
[0010]
Hereinafter, an electromagnet device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a released state of an electromagnet device according to an embodiment of the present invention along the line A1-A1 of FIG. 3, and FIG. 2 is a diagram of the electromagnet device according to an embodiment of the present invention. FIG. 3 is a front view showing the configuration of the electromagnet device when viewed from the direction A2 of FIGS. 1 and 2, and FIG. 4 is a front view of the electromagnet device when viewed from the direction A3 of FIG. It is a side view which shows a structure.
[0011]
1 to 4, the electromagnet device is provided with a movable element 2 and a stationary element 3 that can be brought into contact with and separated from each other, and a cutoff spring 4 that is biased so as to separate the movable element 2 and the stationary element 3. Is provided. In addition, the electromagnet device is provided with an exciting coil 8 for bringing the mover 2 into contact with the stator 3 and a permanent magnet 9 for generating a magnetic force for maintaining the contact state between the mover 2 and the stator 3. It has been. Here, the mover 2 and the stator 3 are formed in a cylindrical shape, and the mover 2 is fixed to the movable shaft 1 penetrating through the central portion of the electromagnet device, and the stator 3 is formed therein. The movable shaft 1 is inserted through the through hole. The mover 2 and the stator 3 are arranged so that a gap 5 is formed in which the mover 2 can be separated from the stator 3 when released. Here, a movable screw 1 a is formed at one end of the movable shaft 1. The movable element 2 can be fixed to the movable shaft 1 by attaching the movable nut 1b to the movable screw 1a and tightening the movable nut 1b.
[0012]
A spring groove 4 a is formed along the movable shaft 1 on the opposing surface side of the movable element 2 and the stator 3. And the interruption | blocking spring 4 is arrange | positioned so that it may straddle the space | gap part 5 in the spring groove | channel 4a. A cylindrical frame 6 surrounding the mover 2 and the stator 3 is provided outside the mover 2 and the stator 3. Here, a frame end 6 a orthogonal to the movable shaft 1 is formed at one end of the frame 6, and an end plate 7 disposed to face the frame end 6 a is attached to the other end of the frame 6.
[0013]
A through hole for inserting the stator 3 is formed in the frame end 6a, and a support groove 3a into which the tip of the frame end 6a is inserted is formed in the stator 3. The stator 3 and the frame 6 are fixed by inserting the tip of the frame end 6a into the support groove 3a. An excitation coil 8 and a permanent magnet 9 housed in the frame 6 are disposed on the outer peripheral side of the mover 2 and the stator 3. Here, the exciting coil 8 and the permanent magnet 9 can be arranged side by side along the movable shaft 1.
[0014]
The exciting coil 8 can be configured in a cylindrical shape so that a part of the stator 3 and the mover 2 is surrounded. The exciting coil 8 can be formed by winding an electric wire around the coil frame 8 a having a hollow portion, and the mover 2 and the stator 3 can be inserted into the hollow of the exciting coil 8. Here, a gap 2 a can be formed along the movable shaft 1 between the mover 2 and the coil frame 8 a.
Moreover, the permanent magnet 9 can be configured in a ring shape so that, for example, a part of the mover 2 is surrounded. In addition to the ring shape, the permanent magnet 9 may be formed in, for example, a bar shape and arranged vertically via the mover 2.
[0015]
The permanent magnet 9 is sandwiched between the magnetic plates 11 and 12 and is fixed to the frame 6 via the magnetic plates 11 and 12. Here, the magnetic plate 11 is disposed so as to be in contact with the inner surface of the frame 6 so as not to contact the movable element 2 and to be in contact with one pole of the coil frame 8 a and the permanent magnet 9. The magnetic plate 11 and the permanent magnet 9 form a space 13 that communicates with the gap 2a. Further, the magnetic plate 12 is disposed so as to be slidable with the mover 2 so as not to contact the frame 6, and is disposed so as to be in contact with the other pole of the permanent magnet 9.
[0016]
Further, a fastening bolt 14 is disposed between the magnetic plate 12 and the end plate 7, and the fastening bolt 14 is inserted into a through hole formed in the end plate 7. Then, a tightening nut 15 is attached to the thread groove of the tightening bolt 14, and the tightening nut 15 is tightened, whereby the tightening bolt 14 is pressed against the magnetic plate 12, and between the tightening bolt 14 and the frame end 6a. The excitation coil 8 and the permanent magnet 9 can be supported.
[0017]
A magnetic shorting plate 16 is detachably provided between the magnetic plates 11 and 12 so as to straddle the permanent magnet 9. Here, the magnetic short-circuit plate 16 can be installed between the magnetic plates 11 and 12 so that the magnetic plates 11 and 12 are magnetically short-circuited, and the amount of magnetic flux generated from the permanent magnet 9 can be reduced. . In addition, the magnetic short circuit board 16 can be formed with a steel plate, for example. Then, the magnetic short-circuit plate 16 can be mounted between the magnetic plates 11 and 12 or the magnetic short-circuit plate 16 can be removed by the magnetic attractive force of the permanent magnet 9. Further, the amount of magnetic flux generated from the permanent magnet 9 can be increased or decreased by increasing or decreasing the cross-sectional area of the magnetic short-circuit plate 16.
In addition, as shown in FIG. 4, you may make it form the round surface 17 in the contact surface with the magnetic short circuit board 16 in the edge parts 11a and 12a of each magnetic board 11 and 12. As shown in FIG.
[0018]
Hereinafter, the operation of the electromagnet device of FIGS. 1 to 4 will be described.
In this electromagnet device, the magnetic short-circuit plate 16 can be attached to operate as a constant excitation, and the magnetic short-circuit plate 16 can be removed to operate as an electromagnetic latch.
In FIG. 1, when the electromagnet device is released, the movable element 2 and the stator 3 are separated by the cutoff spring 4. A gap 5 is formed between the mover 2 and the stator 3, and the end of the mover 2 is held in contact with the end plate 7.
[0019]
Here, when the end of the mover 2 comes into contact with the end plate 7, the magnetic flux φ ₂ generated by the permanent magnet 9 is permanent magnet 9 ⇒ magnetic plate 12 ⇒ mover 2 ⇒ end plate as shown by the dotted line. 7⇒Frame 6⇒Magnetic plate 11⇒Permanent magnet 9 is mainly circulated to form the magnetic path 10b. When the electromagnet device is released, the state in which the mover 2 is always in contact with the end plate 7 can be maintained by the magnetic attractive force of the magnetic passage 10b. For this reason, the moving distance by which the mover 2 moves from the blocking position to the closing position can be made uniform, and the contact time in which the mover 2 can contact the stator 3 can be made uniform. The quality of the apparatus can be improved.
[0020]
When the exciting coil 8 is energized in this state and the exciting coil 8 is excited, the magnetic flux φ ₁ generated by the exciting coil 8 is, as shown by the dotted line in FIG. 2, the permanent magnet 9 → the magnetic plate 12 → the movable element 2. ⇒ Stator 3 ⇒ Frame 6 ⇒ Magnetic plate 11 ⇒ Permanent magnet 9 is mainly circulated, so that magnetic path 10 a is formed and magnetic flux φ ₂ of permanent magnet 9 also joins magnetic path 10 a.
Then, the mover 2 is attracted to the stator 3 by the magnetic attractive force of the magnetic fluxes φ ₁ and φ ₂ flowing through the magnetic flux passage 10a, and the mover 2 is blocked while moving in the direction of the stator 3 as shown in FIG. While compressing the spring 4, the movable element 2 comes into contact with the stator 3 and enters the loaded state.
[0021]
Here, the magnetic short-circuit plate 16 and the magnetic plates 11 and 12 are mounted, the magnetic flux phi ₂ of the permanent magnet 9 also flows through the magnetic short-circuit plate 16 so as to short-circuit between the magnetic plates 11 and 12 magnetically . For this reason, the amount of magnetic flux from the permanent magnet 9 is reduced by the magnetic loss of the magnetic short-circuit plate 16, and the magnetic attractive force of the permanent magnet 9 is reduced. Therefore, by replenishing the decrease in the magnetic attractive force by the magnetic attraction force of the magnetic flux phi ₁ from the exciting coil 8, it is possible to maintain the closed state, it can be operated as an excitation always.
[0022]
On the other hand, when the magnetic short-circuit plate 16 is removed, the movable element 2 comes into contact with the stator 3 by the magnetic attraction force from the permanent magnet 9 in the magnetic flux path 10a, and the inserted state is maintained, and can be operated as an electromagnetic latch. . For this reason, after shifting to the on state, the energization of the exciting coil 8 is stopped, or the energization current is reduced, so that the energy can be saved.
[0023]
Thus, by removing the magnetic short-circuit plate 16, it can be operated as an electromagnetic latch, and the energized state can be maintained without energizing the exciting coil 8. In addition, it is possible to maintain the input state by the electromagnetic attractive force of the permanent magnet 9 even when the power is cut off at the time of a power failure or the like. In addition, by attaching the magnetic shorting plate 16 between the magnetic plates 11 and 12, it can be operated as always excited, and when the power is cut off at the time of a power failure or the like, it is possible to automatically shift to the shut-off state. .
[0024]
For this reason, the electromagnetic latch and the constant excitation can be used in one electromagnetic device, and the electromagnetic latch and the constant excitation can be easily switched without complicating the configuration. It is possible to improve the usability of the electromagnet device while suppressing the increase in size and cost of the electromagnet device.
In the electromagnet device of the present invention, the magnetic shorting plate 16 can be removed in order to switch from the regular excitation to the electromagnetic latch, and even the existing electromagnet device can be easily shifted from the regular excitation to the electromagnetic latch. Can do.
[0025]
In the above-described embodiment, the method of separating the mover 2 from the stator 3 by the release force of the stored energy of the cutoff spring 4 has been described. However, the reverse magnetic attraction force of the excitation coil 8 alone can be moved from the stator 3. Since the child 2 can be separated, the blocking spring 4 is not necessarily required.
Further, the magnetic short-circuit plate 16 disposed between the magnetic plates 11 and 12 can be observed from the outside of the electromagnet device, and a manufacturing error or imitation by a third party can be easily found.
[0026]
Further, the amount of magnetic flux generated from the permanent magnet 9 can be increased / decreased by increasing / decreasing the cross-sectional area of the magnetic short-circuit plate 16, and the exciting current supplied to the exciting coil 8 can be adjusted to an arbitrary value.
Further, in each of the magnetic plates 11 and 12, by forming the rounded surface 17 on the contact surface with the magnetic short-circuit plate 16, the magnetic flux can be concentrated on the rounded surface 17. Therefore, magnetic loss can be reduced and magnetic efficiency can be improved.
[Possibility of industrial use]
[0027]
The electromagnet device of the present invention can be used for, for example, a switch such as a circuit breaker or a leakage breaker, or an electromagnetic actuator used for a breaker, and it is necessary to break the breaker when the power is turned off. It is possible to apply the present invention to any field and any field where it is necessary to keep the power-on state when the power is turned off.

Claims (6)

A movable shaft with a mover attached,
A stator that is inserted into the movable shaft and is movable toward and away from the movable element;
An excitation coil that is arranged to surround the mover and the stator and generates a magnetic force that moves the mover in the direction of the stator;
A permanent magnet that generates a magnetic force to maintain a contact state between the mover and the stator;
A frame that surrounds the exciting coil and the permanent magnet, and that forms a magnetic path for moving the mover toward the stator by the magnetic flux of the exciting coil and the permanent magnet;
A magnetic short-circuit plate provided so as to straddle the permanent magnet and reducing the amount of magnetic flux generated from the permanent magnet;
An electromagnet apparatus, wherein a magnetic flux reduced by the magnetic short-circuit plate is supplemented with a magnetic flux of an exciting coil when the movable element and the stator are in contact with each other. A first magnetic plate disposed in contact with the inner surface of the frame and one pole of the permanent magnet;
A second magnetic plate disposed slidably with the mover and disposed so as to contact the other pole of the permanent magnet;
2. The electromagnet device according to claim 1, wherein the magnetic short-circuit plate is detachably disposed between the first magnetic plate and the second magnetic plate. A first magnetic plate disposed so as to be in contact with the inner surface of the frame and in contact with one pole of the permanent magnet so as not to contact the mover;
A second magnetic plate disposed so as to be slidable with the movable element so as not to contact the frame and in contact with the other pole of the permanent magnet;
The electromagnet device according to claim 1, wherein the magnetic short-circuit plate is installed between the first magnetic plate and the second magnetic plate.   The permanent magnet and the exciting coil are arranged side by side along the movable shaft, and the permanent magnet is supported in the frame while being sandwiched between the first magnetic plate and the second magnetic plate. The electromagnet device according to claim 2, wherein the electromagnet device is provided.   5. The electromagnet device according to claim 1, wherein the amount of magnetic flux generated from the permanent magnet is increased or decreased by increasing or decreasing the cross-sectional area of the magnetic short-circuit plate.   6. The electromagnet device according to claim 1, wherein the first magnetic plate and the second magnetic plate have a rounded contact surface with the magnetic short-circuit plate.

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