Electromagnet actuating control element, in particular, for medium voltage breaker

FIELD: electricity.

SUBSTANCE: invention relates to the field of electric engineering, namely, to electromagnet actuator control element, in particular, for medium voltage breaker. Device comprises magnetic circuit, including movable magnetic rectangular core with control coil and movable circular yoke complying with magnetic circuit. Technical result is achieved by the fact that yoke (3) is fixed on driving axis (4), which on one side movably passes through centre of magnetic core, and on the other side is connected to switched traction rod of contact closure, side of driving axis passing through magnetic conductor, protrudes outside with lower end and is connected to the second yoke (7), smaller in side size.

EFFECT: improved compactness and increased capacity.

14 cl, 2 dwg

 

The invention relates to electromagnetic Executive control, in particular for a circuit breaker medium voltage having a coil mounted on the core, and a movable yoke according to the restrictive part of paragraph 1 of the claims, as well as to a method of manufacturing such Executive control according to the restrictive part of paragraph 15 of the claims.

Electromagnetic actuating controls of this kind are widely used. Along with use in switches medium voltage for adjustable control movable contacts such Executive controls are also used in machines and switches.

The prior art electromagnetic actuator vacuum circuit breakers medium voltage represented by electromagnets with one or two coils. As already mentioned, the electromagnet is designed to move the movable contact of the vacuum chamber when switched to the fixed contact and the spring tension, creating contact pressure, while the excess of turn.

To begin the movement, the coil of an electromagnet is current. The engaged position is then stored using one or more permanent magnets acting against the force of the spring, creating a contact pressure is. The current in the coil that is used as a coil turn in the future is no longer required.

To open the circuit breaker to feed current to the coil off of the Executive control with two coils, which reduces the holding force of permanent magnets that spring, creating contact pressure, may not be withheld and opens the sliding contact. In the further course of the shutdown through the coil off may be generated by the opening force.

In the case of an electromagnet with a single coil, the coil can essentially only to initiate the shutdown. The further course of the outage is determined by the spring, creating contact pressure, as well as the special spring off.

Existing Executive controls with a single coil often are axisymmetric. This prevents simple coordination with other current short-circuit current, so as to change the area of the air gap must be chosen a different diameter. Each of the parts is used for only one structural size.

The purpose of this invention to provide such an electromagnetic actuator to control the above-mentioned type, in particular, are preferred for use in switch, medium voltage, blagoj the OC which is achieved a compact design with simultaneous high power Executive control.

To solve this problem of electromagnetic Executive control, in particular for a circuit breaker medium voltage, comprising a magnetic circuit including a movable rectangular magnetic core with a coil of control and moving round the yoke corresponding to the magnetic circuit, supplied with the drive axis passing through the magnetic core, which on the one hand fixed top round yoke, and the other side is out, and its lower end connected with the lower lower yoke. Thanks to this performance in the off position holding force is generated.

Other preferred variants are listed in the dependent claims.

By combining the rectangular core is not rectangular yoke, and with a circular, axisymmetric yoke is not necessary to protect the axisymmetric yoke from turning: it performs its function the same in any position, which is especially important when using circuit breakers medium voltage.

So, come to design a rectangular magnetic core fixed-length and variable width. Because the core is made of layers of sheet metal by changing the number of metal sheets, you can change its width. Lateral strengthening, the bearing and the axis of the can is about to save. You only need to adjust the permanent magnets and the armatures of the coils under the constructive core size using modifications of different length.

Compared with the Executive control with two coils of the present invention, as the existing Executive controls with a single coil, has the advantage of reducing structural size and weight reduction. This is mainly due to the fact that you need only one coil and one magnetic circuit.

Compared with the existing Executive controls with one coil of the present invention allows for easy adjustment of the size of the magnet to the calculated short-circuit current circuit breakers medium voltage grid of 2,5-16-20-25-31,5-40 and 50 kA. First of all, you need to change the holding force of the Executive control by changing the area of the air gap.

Another advantage of the invention is that the yoke can rotate on the threads on the axle, allowing you to smoothly adjust the speed of the magnetic element management. There is also a benefit from the use of a separate Executive control for a wide range of applications, varying the stroke length of the opening.

Fully compact instrument can be is implemented, if the actuator is located directly beneath the driven switching pole without using the levers and elbows. Direct coupling improves the quality characteristics of the path/time drive free from distorting influences the stiffness of the spring and gaps in more complex systems drives.

Of course, you might need adjusting drive existing structures. Thus it becomes possible to connect the magnetic actuating element, for example through systems of levers with multiple driven switching poles and set them in motion at the same time. The advantages in this case are that by using the relationship of the shoulders of the lever can be selectively adjusted effort and progress.

Further distinction of the present invention is the use of high concentration of magnetic energy. When given constructive volume, particularly with the limited area of the magnetic air gap can be made small magnetic forces due to the fact that:

1) the area of the permanent magnets is not limited to a given area of the air gap, and due to the fact that

2) the magnetic flux then is centered in the air gap.

In a preferred embodiment provides that the Executive element of the control without arms and elbows is located directly below the vacuum chamber of the circuit breaker medium voltage and acts directly on the contact rod.

This provides a good and fast effect of the force.

In a preferred embodiment provides that the Executive control simultaneously disables multiple cameras switch with clutch elements.

In addition, the advantage of this variant is that Executive control actuates the camera switch camera switch using levers. This may be necessary in certain embodiments of the switches. It is also quite possibly achieved by using this significant advantages of actuation forces.

Further, in a preferred embodiment indicates that the course may change due to structural changes of the yoke on the drive axis.

Further, in a preferred embodiment, indicated that permanent magnets arranged in the magnetic core, and the direction of magnetization is parallel to the plane of the air gap.

When this magnetic circuit constructively aligned so that the air gap creates a magnetic induction of more than 2 T.

In a preferred embodiment, it is specified that the yoke is fixed to the drive axis, which on the one hand movably passes through the center of the magnetic core, and on the other article the Rhone connected to the public switched thrust the contact is closed. Thus, the implemented design, which guarantees a compact direct hinged connection for actuation of the contact elements.

When opened further embodiment of the structural form in which the lower yoke and the upper yoke are spaced from each other at a distance using a rigid bond and placed on the drive axle so that when the upper yoke in a given course rises above the magnetic core, the bottom yoke bottom adjacent to the magnetic core is formed as a lock off position of the contact element.

To fully repay the move into the end stopper movement between the lower yoke and the bottom side of the magnetic yoke is the damping strip.

To ensure off is provided by at least one spring to the impact on the drive axle, while the preferred plate spring.

Since the magnetic core is assembled from metal sheets, are sufficiently reduced eddy currents, inductive changes in the flow. The addition of silicon to metal can be waived.

In General also disclosed a method of manufacturing a number of different electromagnetic actuators control design under paragraphs 1 through 14 of the formula image is etenia, the series-produced by varying the width of the rectangular magnetic core and the diameter of the circular yoke. Thus, it is possible serial production with consideration of various sizes.

The invention represented in the drawings and then more detail is revealed.

Figure 1 is a - perspective view on the magnetic Executive control with a round yoke.

Figure 2 - representation of flow lines.

Figure 1 in perspective shows the Executive control of the electromagnet 1, the coil 5, a rectangular magnetic core 2 and a circular yoke 3. When this yoke is fixed to the drive axis 4 which slidably passes through the center of the magnetic core 2.

Figure 2 shows the lines of the threads in this electromagnetic actuator control. Magnetic core 2 shows the characteristics of the lines of flux in a closed system, i.e. when the round yoke 3 is attached to the magnetic core 2. Inside the magnetic core integrated permanent magnets 6, the direction of magnetization which is parallel to the plane of the air gap.

Drive axle not depicted here, but it kept all the yoke 2 and the lower lower yoke 7 at a distance, as described above. Between the lower yoke 7 and the magnetic core 2 can be located damping gasket 8.

Ispolnitelnitsam control can also be placed inside of a switching device. Drive axle Executive control associated with a movable contact of the vacuum chamber and respectively act on it, causing the on/off control. This connection can be implemented in a straight line or via the lever on the hinges.

In General, there are also the following dependencies.

Available practice materials for permanent magnets with high magnetic energy (for example, neodymium-iron-boron, samarium-cobalt) have a residual magnetic induction in the range from 1 to 1.4 Tesla. This is much less that can be installed in a metal core with a valid magnetic leakage. Therefore, in accordance with the invention are mounted permanent magnets with horizontal polarity. When flow is in the horizontal direction in the core rod, it concentrates. Given the length of the core rod can generate a greater flow than at the location of the permanent magnets in the core rod and the vertical polarization.

Further concentration of the magnetic flux occurs at the transition from the core rod to the yoke through an air gap. To maximize the holding force magnetic discussed Executive control is calculated so that the achieved magnetic induction of more than 2 T.

If permanent magnets in the held, as shown here, in such a way that their ends are visible on the underside of the magnet and, in addition, forming the lower end of a metal chain, smooth surface, with a second smaller yoke is possible to generate the second lower holding force in the deactivated state of the magnet. This provides a lock off of the provisions of the movable contact of the vacuum chamber, protected from inadvertent inclusion, for example, because of the concussion.

Between the magnetic core Executive control and the second yoke may be placed damping lining, shock absorbing mechanical shock of the second yoke of the core during shutdown. It provides as preventing vibrations at impact and promotes greater durability just switching device.

Here is used for the magnetic core metal sheets with a low silicon content, in order to reduce eddy currents induced by changes in flow. However, the use of silicon reduces the magnetic polarizability of the material. To achieve the greatest forces in discussing magnetic Executive control can be applied to metal sheets without the addition of silicon.

If necessary, the variation width of the magnetic core for the implementation of the magnets of varying strength, as described above, rugina off can not be placed in the middle of the magnet, because this violates the magnetic symmetry, which can be compensated for only one structural size. Instead accommodated springs off outside the magnet.

In addition, the proposed plate spring fixed within the Executive control and based on the Cabinet side switching device. Along with very simple design advantages here are a small number of elements, low costs and opportunities through the length of the PCB to adjust the tension force of the spring.

1. Electromagnetic Executive control, in particular for a circuit breaker medium voltage, comprising a magnetic circuit including a movable rectangular magnetic core with a coil of control and moving round the yoke corresponding to the magnetic circuit, characterized in that it is equipped with a drive shaft (4)passing through the magnetic core (2), which on the one hand fixed top round yoke (3)and the other side is out, and its lower end connected with the lower lower yoke (7).

2. Electromagnetic Executive control according to claim 1, characterized in that the Executive control without arms and elbows is located directly below the vacuum chamber of the circuit breaker medium voltage the Oia and acts directly on the contact rod.

3. Electromagnetic Executive control according to claim 1 or 2, characterized in that Executive control is made with the possibility of simultaneously switching multiple cameras switch with clutch elements.

4. Electromagnetic Executive control according to claim 1, characterized in that the actuating element is designed with the ability to move the camera switch camera switch using levers.

5. Electromagnetic Executive control according to claim 1, characterized in that due to the offset arrangement of the yoke (3) to the drive axis (4) can change the course.

6. Electromagnetic Executive control according to claim 1, characterized in that the permanent magnets (6) arranged in the magnetic core (2), and their direction of magnetization is parallel to the plane of the air gap.

7. Electromagnetic Executive control according to claim 1, characterized in that the magnetic circuit is structurally aligned so that the air gap creates a magnetic induction of more than 2 T.

8. Electromagnetic Executive control according to claim 1, characterized in that the other side of the drive axis is connected to the public switched thrust the contact is closed.

9. Electromagnetic Executive control according to claim 1, featuring the the action scene, the bottom yoke (7) and the upper yoke (3) are spaced from each other at a distance using a rigid bond and placed on the drive axle (4), so that, when the upper yoke in a given course rises above the magnetic core, the bottom yoke bottom adjacent to the magnetic core.

10. Electromagnetic Executive control according to claim 9, characterized in that between the lower yoke (7) and a magnetic core (2) is the damping strip (8).

11. Electromagnetic Executive control according to any one of claims 1 or 2, characterized in that to ensure off on the drive axis is provided by at least one spring.

12. Electromagnetic Executive control in claim 11, wherein the spring is a plate spring.

13. Electromagnetic Executive control according to claim 1, characterized in that the magnetic core is assembled from metal sheets, without the addition of silicon.

14. A method of manufacturing an electromagnetic actuator according to one of claims 1 to 11, characterized in that serially produced a number of different Executive control by varying the width of the rectangular magnetic core and the diameter of the circular yoke.



 

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EFFECT: increase of response speed.

9 cl, 5 dwg

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