(19)
(11)EP 3 021 333 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
16.10.2019 Bulletin 2019/42

(21)Application number: 13888967.0

(22)Date of filing:  11.07.2013
(51)International Patent Classification (IPC): 
H01F 7/08(2006.01)
H01H 3/22(2006.01)
H01H 33/666(2006.01)
H01H 50/42(2006.01)
H01F 7/16(2006.01)
H01H 3/28(2006.01)
H01H 50/18(2006.01)
H01H 50/64(2006.01)
(86)International application number:
PCT/CN2013/079236
(87)International publication number:
WO 2015/003370 (15.01.2015 Gazette  2015/02)

(54)

MAGNETIC ACTUATOR

MAGNETISCHER AKTUATOR

ACTIONNEUR MAGNÉTIQUE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(43)Date of publication of application:
18.05.2016 Bulletin 2016/20

(73)Proprietor: Siemens Aktiengesellschaft
80333 München (DE)

(72)Inventors:
  • YAO, Jilong
    Beijing 100012 (CN)
  • YANG, Chao
    Beijing 100200 (CN)
  • SONG, Yinghua
    Beijing 100012 (CN)
  • ZHAO, Yanfeng
    Beijing 100012 (CN)
  • WANG, Lanjin
    Beijing 102208 (CN)
  • CHENG, Jian
    Beijing 100039 (CN)

(74)Representative: Patentanwaltskanzlei WILHELM & BECK 
Prinzenstraße 13
80639 München
80639 München (DE)


(56)References cited: : 
WO-A1-2008/139250
CN-A- 101 315 836
CN-Y- 2 840 291
US-A- 4 272 661
WO-A1-2008/139250
CN-A- 102 881 493
CN-Y- 2 840 291
US-A1- 2013 027 158
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Technical Field



    [0001] The present invention relates to an actuator, and particularly to a magnetic actuator of a circuit breaker or a high-speed reversing switch.

    Background Art



    [0002] Actuators are important components of the circuit breaker and the high-speed reversing switch. At present, there are spring actuators, electromagnetic actuators, and permanent magnetic actuators, etc. The spring actuators have the advantage that there is no need for a high-power direct-current power supply and have the defects of relatively complicated structure, more parts, and poor reliability. The electromagnetic actuators have a cumbersome structure and a relatively long switching-off and switching-on time. The permanent magnetic actuators use a permanent magnet as a component for keeping the switching-off and switching-on positions. When the permanent magnetic actuators work, only one main moving component is provided, the switching-off and switching-on current is small, the mechanical service life is long, but the movement inertia of the moving component when in a switching-off state is relatively large, and a higher action speed cannot be achieved. A typical actuator of a vacuum circuit breaker is disclosed in China patent CN 101315836 A (published on February 13, 2008), the actuator mainly comprising an eddy-current disc, a switching-off coil, a switching-on coil and a charging circuit. When the charging circuit is excited, the rapidly-increased current would flow through the switching-off coil or the switching-on coil, and the switching-off coil or the switching-on coil will induce an eddy current in the eddy-current disc. In this way, a relatively large electromagnetic repulsive force can drive the eddy-current disc to leave the corresponding coil. The actuator further comprises a spring mechanism for keeping the switching-off state and the switching-on state. Although the switching-off operation can be rapidly realized by virtue of the electromagnetic repulsive force, the actuator has a large energy consumption and poor controllability.

    [0003] WO2008139250A1 discloses a magnetic actuator with the features of the first part of claim 1.

    Summary Of The Invention



    [0004] The present invention aims at simplifying the actuator, reducing the size thereof, reducing the energy consumption and improving the stability.

    [0005] A magnetic actuator according to the present invention is defined in claim 1.

    [0006] Preferably, the first magnetic yoke component is provided with a groove, and the eddy-current component is arranged in the groove.

    [0007] Preferably, the eddy-current component and the first magnetic yoke component together form a cone or a truncated cone. The electromagnetic coil and the eddy-current coil are both located in a framework formed by the eddy-current component and the first magnet yoke component.

    [0008] Preferably, the electromagnetic coil and the eddy-current coil share one power supply or one power supply capacitor, or respectively utilize different power supplies or different power supply capacitors.

    [0009] Preferably, the actuator is applied to a circuit breaker, the actuator further comprises a drive rod, the drive rod is connected to the movable unit, and one end of the drive rod is connected to a contact terminal of the circuit breaker.

    [0010] Preferably, the other end of said drive rod is connected to a spring, the spring is used for holding said movable unit in either a switching-off position or a switching-on position of the circuit breaker, and said permanent magnetic holding component comprising the permanent magnet is used for holding the circuit breaker in the other of the switching-off and switching-on positions.

    [0011] Preferably, two groups of actuators are symmetrically arranged relative to the drive rod.

    [0012] According to the embodiment of the present invention, the eddy-current component and the first magnetic yoke component are integrally designed, so that compared with the existing actuators, this actuator is small in size and compact in structure; meanwhile, this actuator has fewer components, so that the reliability thereof is better, and the control mode is more flexible. Due to the compact structure,

    [0013] a plurality of circuit breakers with such an actuator can be connected in series in a high-voltage application. For example, if the rated voltage of a circuit breaker with the actuator is 20 KV, and the rated voltage of a power transmission line is 50 KV, then three circuit breakers of this type can be connected in series to protect the power transmission line. In addition, in a preferable embodiment, the switching-on and switching-off operations can be realized by means of a combination of the electromagnetic coil and the eddy-current coil, such that the current value loaded on the eddy-current coil can be greatly reduced when the movable unit is separated from the second magnet yoke by a certain gap, and the energy consumption can be reduced.

    Description of the Drawings



    [0014] 

    FIG. 1 is a structural schematic diagram of the present invention, which is used for illustrating the basic working principle of the present invention;

    FIG. 2 is a structural schematic diagram of an electrical control circuit of the present invention;

    FIG. 3 is a structural schematic diagram of one embodiment of the present invention;

    FIGS. 4 and 5 are structural schematic diagrams of another embodiment of the present invention, which can be applied to a circuit breaker and comprises two groups of actuators. FIG. 4 shows one state of the circuit breaker, and FIG. 5 shows another state of the circuit breaker.


    Particular Embodiments



    [0015] In order to make the technical solution and advantages of the present invention clearer, the present invention is further illustrated in detail in conjunction with the attached drawings and the embodiments. It should be understood that the particular embodiments described herein are only used for illustratively describing the present invention, and are not intended to limit the scope of protection of the present invention.

    [0016] A magnetic actuator in the embodiment of the present invention comprises a movable unit capable of moving between a first position and a second position. The movable unit comprises an eddy-current component and a first magnet yoke component, i.e. first magnetic yoke component, which are formed integrally; a second magnet yoke component, i.e. second magnetic yoke component, for forming a magnetic circuit with the first magnet yoke component; an electromagnetic coil capable of generating a magnetic field when being energized, with magnetic lines generated by the energized electromagnetic coil penetrating the magnetic circuit formed by the second magnet yoke component and the first magnet yoke component;
    an eddy-current coil arranged opposite to the eddy-current component and enabling an eddy current to be generated in the eddy-current component, so as to produce an electromagnetic repulsive force to the movable unit; and a permanent magnetic holding component for holding the movable unit in the first position or the second position.

    [0017] The basic working principle of the present invention is explained in conjunction with FIGS. 1 and 2. FIG. 1 is a structural schematic diagram for illustrating the basic working principle of the present invention; and FIG. 2 is a structural schematic diagram of an electrical control circuit of the present invention. As shown in FIG. 1, the actuator comprises the movable unit 1, just as its name implies, the movable unit 1 is movable, and here is movable between two positions, for example, a switching-off position and a switching-on position of the circuit breaker, so that the on-off operations of a circuit breaker or a high-speed reversing switch can be realized. The movable unit 1 comprises an eddy-current component 2 and a first magnet yoke component 3, which are formed integrally. The eddy-current component 2 is a disc-shaped component made of metal such as copper. It shall be noted that the eddy-current component 2 and the first magnet yoke component 3 being "formed integrally" does not mean that the eddy-current component 2 and the first magnet yoke component 3 must be made into one component, as long as the two are not separated in space and can move together under the effect of a force by virtue of interaction without the transmission of other components. For example, the eddy-current component 2 and the first magnet yoke component 3 may be strip-shaped or plate-shaped components which are stacked in a vertical direction, and the eddy-current component and the first magnet yoke component can be fixed together by utilizing components such as a bolt or an adhesive material. Possibly, as shown in FIG. 1, the first magnet yoke component 3 may be groove-shaped, and the eddy-current component 2 may be in a strip shape which can be embedded into a groove of the first magnet yoke component 3. The eddy-current component 2 and the first magnet yoke component 3 can together form a truncated cone or a cone, so that when the mechanical strength of the moving unit 1 is maintained, the weight of the movable unit 1 can be reduced, and the air resistance against the movable unit 1 during moving can be reduced. The eddy-current component 2 and the first magnet yoke component 3 are made as a whole, so that compared with the existing actuators, this actuator is small in size and compact in structure; meanwhile, this actuator has fewer components, so that the reliability thereof is better.

    [0018] The actuator shown in FIG. 1 further comprises an eddy-current coil 5 arranged opposite to the eddy-current component 2. One end of the eddy-current coil 5 is connected to a power supply capacitor or a power supply. The power supply capacitor or the power supply can be connected to a control device, so that the power supply capacitor or the power supply is controlled by the control device to charge the eddy-current coil 5, a high-frequency current and magnetic field will be generated in the eddy-current coil 5, under the action of the high-frequency magnetic field, an eddy current in the opposite direction of the current in the eddy-current coil 5 can be induced in the eddy-current component 2, a magnetic field generated by the current in the eddy-current coil 5 and a magnetic field generated by the eddy current in the eddy-current component 2 are opposite in direction, the eddy-current coil and the eddy-current interact with each other to generate a repulsive electromagnetic force, and the electromagnetic force moves the movable unit 1 quickly to execute the on or off operation. Since the eddy-current coil 5 has a small inductance, the current passing through the energized eddy-current coil 5 can be rapidly increased, and the energized eddy-current coil 5 can rapidly excite the eddy current in the eddy-current component 2, so as to generate the electromagnetic repulsive force, so that the movable unit 1 leaves the second magnet yoke component 7, and the on and off operation can be rapidly realized.

    [0019] As shown in FIG. 1, the actuator further comprises a second magnet yoke component 7, and the second magnet yoke component 7 and the first magnet yoke component 3 form a magnetic circuit. As shown in FIG. 1, the first magnet yoke component 3 and the second magnet yoke component 7 can form a square framework. In addition, it shall be noted that the first magnet yoke component 3 and the second magnet yoke component 7 refer to components which are made of a magnet yoke material. The magnet yoke material refers to a soft magnetic material which does not generate a magnetic field itself and only plays a role of transmitting magnetic lines in a magnetic circuit. Magnet yoke is generally made of a soft iron with a higher magnetic permeability, A3 steel, a soft magnetic alloy, etc.

    [0020] The actuator further comprises a permanent magnetic holding component 6, and the holding component is used for holding the movable unit 1 in the first position (for example, the switching-off position of the circuit breaker) or the second position (for example, the switching-on position of the circuit breaker). The holding component comprises the permanent magnet shown in FIG. 1, the permanent magnetic holding component 6 provides a holding force in both the first position and the second position, namely, when the position of the movable unit 1 is to be changed, the permanent magnetic holding component 6 always applies a resistance to the movable unit.

    [0021] The actuator further comprises an electromagnetic coil 4. The electromagnetic coil 4 can be connected to the power supply capacitor or the power supply, the electromagnetic coil 4 can excite the magnetic field under the effect of the exciting current, and the magnetic lines of the magnetic field penetrate the magnetic circuit formed by the first magnet yoke component 3 and the second magnet yoke component 7. By selecting and controlling the direction of the current flowing through the electromagnetic coil 4, the direction of the magnetic lines of the exciting magnetic field is opposite to the direction of the magnetic lines generated by the permanent magnetic holding component 6, such that the magnetic force generated by the exciting magnetic field of the electromagnetic coil 4 can counteract the magnetic field of the permanent magnetic holding component 6,
    and the movable unit 1 can be assisted to realize the switching-off (or switching-on) operation. A straight-line current can be introduced into the electromagnetic coil 4, for the electromagnetic coil 4 shown in FIG. 1, for example, the straight-line current perpendicular to the paper surface and facing inwards can be loaded onto the left-hand part of the electromagnetic coil 4, and the direction of the straight-line current on the right-hand part of the electromagnetic coil 4 may be perpendicular to the paper surface and face outwards. In this case, the electromagnetic coil 4 is preferably arranged in an area (as shown in FIG. 1) in the square framework formed by the first magnet yoke component 3 and the second magnet yoke component 7, and thus the magnetic lines generated by the straight-line current can penetrate the square magnetic circuit. In addition, an annular current further can also be introduced into the electromagnetic coil 4, and in this case, what is shown in FIG. 1 may be two individual electromagnetic coils 4 rather than a left part and a right part of one electromagnetic coil. Each electromagnetic coil 4 can be provided as one section of the square framework (i.e. the electromagnetic coil 4 being part of the magnetic circuit), such that the magnetic lines generated in the two electromagnetic coils 4 can respectively penetrate the first magnet yoke 3 on the left side and the second magnet yoke 7 on the right side of the FIG. 1. The above-mentioned form of the electromagnetic coil 4 and direction of the introduced current are exemplary, a person skilled in the art can design the forms of the current and electromagnetic coil 4 suitable for the present invention according to the right-hand screw rule, and there is no need to list all forms one by one herein.

    [0022] Preferably, the electromagnetic coil 4 and the eddy-current coil 5 of one actuator are both located in the framework formed by the first magnet yoke component 3 and the second magnet yoke component 7 (as shown in FIG. 1), and thus the actuator has a smaller size and a more compact structure. As shown in FIG. 2, when the electromagnetic coil 4 and the eddy-current coil 5 are both located in the framework formed by the first magnet yoke component 3 and the second magnet yoke component 7, the electromagnetic coil and the eddy-current coil share one shell (i.e. the framework formed by the first magnet yoke component 3 and the second magnet yoke component 7), so that the electromagnetic coil 4 and the eddy-current coil 5 can share one power supply or one power supply capacitor 10. Therefore, the structure of the actuator is more compact. Of course, the electromagnetic coil 4 and the eddy-current coil 5 can also each utilize an individual power supply or power supply capacitor 10.

    [0023] The working principle of the actuator of the present invention is illustrated hereinabove. Two particular applications of the actuator in the circuit breaker are illustrated hereinbelow in conjunction with FIGS. 3-5. FIG. 3 shows the structure of one embodiment of the present invention. This embodiment comprises a group of actuators shown in FIG. 1, which is used for realizing the rapid switching-off (or rapid switching-on) operation of the circuit breaker. This embodiment further comprises a drive rod 8, the drive rod 8 is connected to the movable unit 1, for example, the drive rod 8 may be connected to the first magnet yoke 3, so that the drive rod 8 can move along with the movable unit 1. One end of the drive rod 8 is connected to a contact terminal of the circuit breaker, and the drive rod 8 moves the contact terminal so as to realize the switching-off and switching-on operations of the circuit breaker. The other end of the drive rod 8 is further connected to a spring 9, the spring 9 can provide a motive power for the downward movement of the movable unit 1 and is used for realizing the other operation which cannot be actuated by the actuator, which is the switching-off action if following the above-mentioned description. The inductance of the eddy-current coil 5 is relatively small, the current passing through the electrified eddy-current coil 5 can be rapidly increased, the electrified eddy-current coil 5 can rapidly generate the electromagnetic repulsive force to move the movable unit 1, and the action speed of the spring 9 is much slower than that of the above-mentioned actuator, so that the embodiment shown in FIG. 3 is only suitable for the occasion where only one action of the switching-off operation and the switching-on operation needs to be fast. When the switching-off operation is required, the power supply or the power supply capacitor 10 supplies an instantaneous pulse current to the eddy-current coil 5 and generates a magnetic field, and the magnetic field generates the electromagnetic repulsive force to the eddy-current component 2, so that the movable unit 1 can rapidly leave the second magnet yoke component 7.

    [0024] Meanwhile, the power supply or the power supply capacitor further can be used for powering the electromagnetic coil 4, such that the electromagnetic coil 4 generates a magnetic field, the magnetic lines of the magnetic field penetrate the magnetic circuit formed by the first magnet yoke component 3 and the second magnet yoke component 7, thereby counteracting the magnet lines of the permanent magnetic holding component 6, so that the repulsive force to the eddy-current coil 5 is reduced, and the eddy-current coil 5 can be assisted to implement the switching-off operation. When the movable unit 1 leaves the second magnet yoke 7 by a certain gap, the pulse current in the eddy-current coil 5 needs to be increased, and a large enough electromagnetic repulsive force can be generated to continuously push the movable unit 1 downwards to reach the switching-off position. The spring 9 produces a holding force to enable the movable unit 1 to be maintained in the switching-off state. When the switching-on operation is required, the power supply or the power supply capacitor 10 is controlled to charge the electromagnetic coil 4, the magnetic field generated by the charging can produce a large-enough attractive force to the movable unit 1, the attractive force can counteract the holding force produced by the switching-off spring 9, and the movable unit 1 moves to the switching-on position.

    [0025] FIGS. 4 and 5 are structural schematic diagrams of another embodiment of the present invention, this embodiment comprises two groups of actuators shown in FIG. 3, and the two groups of actuators are symmetrically arranged relative to the drive rod 8. FIG. 4 shows one state of the embodiment, and FIG. 5 shows another state of the embodiment.
    It assumes that FIG. 4 shows the switching-on state of the circuit breaker, and FIG. 5 shows the switching-off state of the circuit breaker (actually, vice versa, i.e. FIG. 4 shows the switching-off state, and FIG. 5 shows the switching-on state), so as to describe the switching-off and switching-on process of the embodiment.

    [0026] When the switching-off operation is required, as shown in FIG. 5, the upper eddy-current coil 5 is energized to produce a downward electromagnetic repulsive force to the eddy-current component 2. Meanwhile, the upper electromagnetic coil 4 is energized to generate the magnetic field, and the direction of the magnetic lines of the magnetic field is opposite to the direction of the magnetic lines of the permanent magnet which is used as the holding component 6, so that the magnet lines of the permanent magnetic holding component 6 can be counteracted. In addition, the current in an appropriate direction may be loaded onto the lower electromagnetic coil 4, so that the lower electromagnetic coil 4 produces the attractive force to the movable unit 1, and the eddy-current coil 2 is assisted to move the movable unit 1 downwards to reach the switching-off position. Possibly, after the eddy-current component 2 leaves the second magnet yoke component 7 by a certain gap, the current in an appropriate direction and size is loaded onto the lower electromagnetic coil 4 in FIGS. 4 and 5, the power supply is controlled to stop the charging of the eddy-current coil 5, the lower electromagnetic coil 4 produces the large-enough attractive force to the movable unit 1, and the movable unit 1 is driven to continuously move downwards to reach the switching-off position. After the movable unit 1 (including the eddy-current component 2) leaves the second magnet yoke component 7 by a certain gap, if the current of a size identical to that at the beginning of the switching-off operation is still loaded onto the eddy-current coil 5, the eddy current generated in the eddy-current component 2 can be greatly reduced due to the existence of a gap between the first magnet yoke component 3 and the second magnet yoke component 7, namely, the electromagnetic repulsive force applied by the eddy-current coil 5 on the movable unit 1 can be greatly reduced. Now, if the electromagnetic repulsive force needs to be maintained constant, the current in the eddy-current coil 5 needs to be greatly increased. For example, when the distance between the movable unit 1 and the second magnet yoke component 7 is 1 mm, the large-enough electromagnetic repulsive force can be generated by loading a current of 100 A onto the eddy-current coil 5, when the distance between the movable unit 1 and the second magnet yoke component 7 is 3 mm, the same electromagnetic repulsive force can be generated by loading a current of 1000 A onto the eddy-current coil 5 (this example is only used for illustrating the general relationship between the gap of the movable unit 1 and the second magnet yoke component 7 and the current loaded onto the eddy-current coil 5.) In order to reduce the current required to be loaded onto the eddy-current coil 5 after the movable unit 1 is separated from the second magnet yoke component 7 by a certain gap, as mentioned above, the lower electromagnetic coil 4 in FIGS. 4 and 5 can be powered on,
    the lower electromagnetic coil 4 will produce a downward attractive force to the movable unit 1, and the movable unit 1 further moves downwardly to reach the switching-off position shown in FIG. 5. If there is no need to consider energy conservation, the eddy-current coil 5 can also be continuously powered to increase the current value after the movable unit 1 leaves the second magnet yoke component 7 by a certain gap, so that the large-enough electromagnetic repulsive force is generated to push the movable unit 1 downwards, and there is no need to load the current onto the lower electromagnetic coil 4.

    [0027] When the switching-on operation is required, as shown in FIG. 4, the lower eddy-current coil 5 is energized, and the lower eddy-current coil 5 produces an upward electromagnetic repulsive force to the eddy-current component 2. After the movable unit 1 leaves the lower second magnet yoke component 7 by a certain gap, the power supplying for the lower eddy-current coil 5 can be stopped, and the current in an appropriate direction can be loaded onto the upper electromagnetic coil 4, such that the upper electromagnetic coil 4 produces an attractive force to the movable unit 1. Meanwhile, the current in an appropriate direction can also be loaded onto the lower electromagnetic coil 4, such that the lower electromagnetic coil 4 generates a magnetic field, and ensures that the direction of magnetic lines of the magnetic field is opposite to the direction of the magnetic lines of the permanent magnetic holding component 6, so as to counteract the magnetic lines of the permanent magnetic holding component 6. The upper electromagnetic coil 4 and the lower electromagnetic coil 4 can together assist the lower eddy-current component 6 to continuously move the movable unit 1 upwardly to reach the switching-on position. The current in the appropriate direction further can be loaded onto the upper electromagnetic coil 4 and the lower electromagnetic coil 4 at the beginning of the switching-on operation, and the eddy-current coil 5 is assisted to move the movable unit 1 upwardly. Possibly, only the lower eddy-current coil 5 is energized. After the movable unit 1 leaves the lower second magnet yoke component 7 by a certain gap, the current value in the lower eddy-current coil 5 is increased, such that the lower eddy-current coil produces a large-enough electromagnetic repulsive force so as to continuously push the movable unit 1 upwardly, and the current is not loaded onto the two electromagnetic coils 4.

    [0028] Therefore, the upper electromagnetic coil 4 and the lower electromagnetic coil 4 in the upper and the lower groups of actuators in FIGS. 4 and 5 have different functions. When in the switching-off operation, the upper electromagnetic coil 4 only can generate the magnetic field to counteract the magnetic lines of the permanent magnetic holding component 6 and cannot produce the repulsive force to the movable unit 1, and the lower electromagnetic coil 4 can produce the downward attractive force to the movable unit 1. When in the switching-on operation, the lower electromagnetic coil 4 only can generate the magnetic field to counteract the magnetic lines of the permanent magnetic holding component 6, and the upper electromagnetic coil 4 can produce the upward attractive force to the movable unit 1. If the energy-saving factor is not considered, either the switching-off operation or the switching-on operation can be realized by only powering the eddy-current coil 5.

    [0029] The above-mentioned embodiment shown in FIGS. 4 and 5 is provided with two groups of actuators, so that not only rapid switching-off operation can be realized, but also rapid switching-on operation can be realized. The switching-off speed and the switching-on speed are both very high, and the average action time can reach 5 m/s. In the occasion where the circuit needs to be rapidly protected and the circuit needs to rapidly return to work, this embodiment can be utilized.

    [0030] It can be seen from the above that according to the embodiment of the present invention, the eddy-current component 2 and the first magnet yoke component 3 are made as a whole, so that compared with the existing actuators, this actuator is small in size and compact in structure; meanwhile, this actuator has fewer components, so that the reliability thereof is better, and the control mode is more flexible. In addition, due to the compact structure, a plurality of circuit breakers with such an actuator can be connected in series in a high-voltage application. For example, if the rated voltage of a circuit breaker with the actuator is 20 KV, and the rated voltage of a power transmission line is 50 KV, then three circuit breakers of this type can be connected in series to protect the power transmission line. In addition, by utilizing the eddy-current coil 5, the switching-off and/or switching-on operation can be rapidly realized. This is because the eddy-current coil 5 has a small inductance, the current passing through the energized eddy-current coil 5 can be rapidly increased, and the energized eddy-current coil 5 can rapidly excite the eddy current in the eddy-current component 2, so as to generate the electromagnetic repulsive force to make the movable unit 1 leave the second magnet yoke component 7. Meanwhile, the electromagnetic coil 4 can also assist the eddy-current coil 5 to complete the switching-off operation. The current in the appropriate direction can be introduced into the electromagnetic coil 4, the magnetic field excited by the electromagnetic coil 4 and the magnetic field of the permanent magnet are opposite in direction, thus the magnetic lines of the magnetic field of the permanent magnet can be counteracted. By combining the eddy-current coil 5 and the electromagnetic coil 4 in FIGS. 4 and 5, the current value loaded onto the eddy-current coil 5 when the movable unit 1 is separated from the second magnet yoke 7 by a certain distance can be greatly reduced, so that the energy consumption can be greatly reduced.

    [0031] The above-mentioned embodiments are preferable embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.


    Claims

    1. A magnetic actuator, comprising:

    a movable unit (1) capable of moving between a first position and a second position, the movable unit (1) comprising an eddy-current component (2) and a first magnetic yoke component (3) which are formed integrally;

    a second magnetic yoke component (7) for forming a magnetic circuit with said first magnetic yoke component (3), wherein the first magnetic yoke component (3) and the second magnetic yoke component (7) form a square framework, the second magnetic yoke component (7) further comprising;

    an electromagnetic coil (4) capable of generating an exciting magnetic field when being energized, with magnetic lines generated by said electromagnetic coil (4) being energized penetrating the magnetic circuit formed by said second magnetic yoke component (7) and said first magnetic yoke component (3), and

    an eddy-current coil (5) arranged opposite to said eddy-current component (2) and enabling an eddy current to be generated in said eddy-current component (2), so as to produce an electromagnetic repulsive force to said movable unit (1), and a permanent magnetic holding component (6) comprising a permanent magnet for holding said movable unit (1) in the first position or the second position, whereby the electromagnetic coil (4) and the eddy-current coil (5) are both located in the framework formed by the first magnetic yoke component (3) and the second magnetic yoke component (7), and the movable unit (1) being movable relative to the second magnetic yoke component(7).


     
    2. The actuator as claimed in claim 1, wherein said first magnetic yoke component (3) is provided with a groove, and said eddy-current component (2) is located in the groove.
     
    3. The actuator as claimed in claim 1, wherein said eddy-current component (2) and the first magnetic yoke component (3) together form a cone or a truncated cone.
     
    4. The actuator as claimed in claim 3, wherein said electromagnetic coil (4) and the eddy-current coil (5) share a power supply or a power supply capacitor, or each utilize an individual power supply or power supply capacitor.
     
    5. The actuator as claimed in claim 1, wherein said actuator is used for a circuit breaker, the actuator further comprises a drive rod (8), said drive rod (8) is connected to said movable unit (1), and one end of the drive rod (8) is connected to a contact terminal of the circuit breaker.
     
    6. The actuator as claimed in claim 5, wherein the other end of said drive rod (8) is connected to a spring (9), the spring (9) is used for holding said movable unit (1) in either a switching-off position or a switching-on position of the circuit breaker, and said permanent magnetic holding component (6) is used for holding the circuit breaker in the other of the switching-off and switching-on positions.
     
    7. The actuator as claimed in any one of claims 5 and 6, wherein two groups of actuators are symmetrically arranged relative to said drive rod (8).
     


    Ansprüche

    1. Magnetischer Stellantrieb, umfassend:

    eine bewegliche Einheit (1), die sich zwischen einer ersten Stellung und einer zweiten Stellung bewegen kann, wobei die bewegliche Einheit (1) eine Wirbelstromkomponente (2) und eine erste Magnetjochkomponente (3) umfasst, die einstückig ausgebildet sind;

    eine zweite Magnetjochkomponente (7) zum Bilden eines Magnetkreises mit der ersten Magnetjochkomponente (3), wobei die erste Magnetjochkomponente (3) und die zweite Magnetjochkomponente (7) einen quadratischen Rahmen bilden, und die zweite Magnetjochkomponente (7) ferner umfasst:

    eine elektromagnetische Spule (4), die bei Erregung zum Erzeugen eines magnetischen Erregerfeldes imstande ist, wobei die Magnetlinien, die durch die elektromagnetische Spule (4) erzeugt werden, die erregt wird, den durch die zweite Magnetjochkomponente (7) und die erste Magnetjochkomponente (3) gebildeten Magnetkreis durchdringen, und

    eine Wirbelstromspule (5), die gegenüber der Wirbelstromkomponente (2) angeordnet ist und die Erzeugung eines Wirbelstroms in der Wirbelstromkomponente (2) ermöglicht, um eine elektromagnetische Abstoßungskraft für die bewegliche Einheit (1) zu erzeugen, und

    eine Dauermagnet-Haltekomponente (6), die einen Dauermagneten zum Halten der beweglichen Einheit (1) in der ersten Stellung oder der zweiten Stellung umfasst,

    wobei

    die elektromagnetische Spule (4) und die Wirbelstromspule (5) beide im Rahmen angeordnet sind, der durch die erste Magnetjochkomponente (3) und die zweite Magnetjochkomponente (7) gebildet wird, und die bewegliche Einheit (1) in Bezug auf die zweite Magnetjochkomponente (7) bewegt werden kann.


     
    2. Stellantrieb nach Anspruch 1, wobei die erste Magnetjochkomponente (3) mit einer Nut versehen ist, und die Wirbelstromkomponente (2) in der Nut angeordnet ist.
     
    3. Stellantrieb nach Anspruch 1, wobei die Wirbelstromkomponente (2) und die erste Magnetjochkomponente (3) zusammen einen Kegel oder Kegelstumpf bilden.
     
    4. Stellantrieb nach Anspruch 3, wobei die elektromagnetische Spule (4) und die Wirbelstromspule (5) sich eine Stromversorgung oder einen Stromversorgungskondensator teilen oder jeweils eine individuelle Stromversorgung oder einen individuellen Stromversorgungskondensator verwenden.
     
    5. Stellantrieb nach Anspruch 1, wobei der Stellantrieb für einen Leistungsschalter verwendet wird, der Stellantrieb ferner eine Antriebsstange (8) umfasst, die Antriebsstange (8) mit der beweglichen Einheit (1) verbunden ist, und eines der Enden der Antriebsstange (8) mit einer Kontaktklemme des Leistungsschalters verbunden ist.
     
    6. Stellantrieb nach Anspruch 5, wobei das andere Ende der Antriebsstange (8) mit einer Feder (9) verbunden ist, die Feder (9) zum Halten der beweglichen Einheit (1) entweder in einer Ausschaltstellung oder einer Einschaltstellung des Leistungsschalters verwendet wird, und die Dauermagnet-Haltekomponente (6) zum Halten des Leistungsschalters in der anderen der Ausschalt- und der Einschaltstellung verwendet wird.
     
    7. Stellantrieb nach einem der Ansprüche 5 und 6, wobei zwei Gruppen von Stellantrieben symmetrisch in Bezug auf die Antriebsstange (8) angeordnet sind.
     


    Revendications

    1. Actionneur magnétique, comportant :

    une unité mobile (1) capable de se déplacer entre une première position et une deuxième position, l'unité mobile (1) comportant un composant (2) à courant de Foucault et un premier composant (3) de culasse magnétique qui sont formés de manière intégrée ;

    un deuxième composant (7) de culasse magnétique servant à former un circuit magnétique avec ledit premier composant (3) de culasse magnétique, le premier composant (3) de culasse magnétique et le deuxième composant (7) de culasse magnétique formant une armature carrée, le deuxième composant (7) de culasse magnétique comportant en outre :
    une bobine électromagnétique (4) capable de générer un champ magnétique d'excitation lorsqu'elle est alimentée, des lignes magnétiques générées par ladite bobine électromagnétique (4) lorsqu'elle est alimentée pénétrant dans le circuit magnétique formé par ledit deuxième composant (7) de culasse magnétique et ledit premier composant (3) de culasse magnétique, et une bobine (5) à courant de Foucault disposée face audit composant (2) à courant de Foucault et permettant à un courant de Foucault d'être généré dans ledit composant (2) à courant de Foucault, de façon à produire une force électromagnétique de répulsion sur ladite unité mobile (1), et un composant (6) de maintien magnétique permanent comportant un aimant permanent servant à maintenir ladite unité mobile (1) dans la première position ou la deuxième position, la bobine électromagnétique (4) et la bobine (5) à courant de Foucault étant toutes deux situées dans l'armature formée par le premier composant (3) de culasse magnétique et le deuxième composant (7) de culasse magnétique, et l'unité mobile (1) étant mobile par rapport au deuxième composant (7) de culasse magnétique.


     
    2. Actionneur selon la revendication 1, ledit premier composant (3) de culasse magnétique étant muni d'une rainure, et ledit composant (2) à courant de Foucault étant situé dans la rainure.
     
    3. Actionneur selon la revendication 1, ledit composant (2) à courant de Foucault et le premier composant (3) de culasse magnétique formant ensemble un cône ou un cône tronqué.
     
    4. Actionneur selon la revendication 3, ladite bobine électromagnétique (4) et la bobine (5) à courant de Foucault partageant une alimentation électrique ou un condensateur d'alimentation, ou utilisant chacune une alimentation électrique ou un condensateur d'alimentation individuels.
     
    5. Actionneur selon la revendication 1, ledit actionneur étant utilisé pour un disjoncteur, l'actionneur comportant en outre une tige (8) d'entraînement, ladite tige (8) d'entraînement étant reliée à ladite unité mobile (1), et une extrémité de la tige (8) d'entraînement étant reliée à une borne de contact du disjoncteur.
     
    6. Actionneur selon la revendication 5, l'autre extrémité de ladite tige (8) d'entraînement étant reliée à un ressort (9), le ressort (9) étant utilisé pour maintenir ladite unité mobile (1) soit dans une position de mise hors tension, soit dans une position de mise sous tension du disjoncteur, et ledit composant (6) de maintien magnétique permanent étant utilisé pour maintenir le disjoncteur dans l'autre des positions de mise hors tension et sous tension.
     
    7. Actionneur selon l'une quelconque des revendications 5 et 6, deux groupes d'actionneurs étant disposés symétriquement par rapport à ladite tige (8) d'entraînement.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description