Linear actuator and high-voltage circuit breaker using same

Abstract

The present invention relates to a linear actuator and a high-voltage circuit breaker using same. The linear actuator according to the present invention comprises: a stator including a coil to which a current is applied; a permanent magnet fixed to the stator; a spring fixed to the stator; a mover extending through the stator and formed to be movable along the axial direction of the stator by the current applied to the coil, the permanent magnet, and the spring; and a shaft extending through the mover and moving together with the mover, wherein at least one of the elastic force of the spring and the magnetic force of the permanent magnet is formed to be adjustable.

Description

Linear actuator and high-voltage circuit breaker using the same

[0001] The present invention relates to a linear actuator, and more specifically, to a linear actuator capable of adjusting operating conditions as needed and a high-voltage circuit breaker using the same.

[0002] Permanent magnet actuators are components used to operate movers in electrical control systems, particularly in high-voltage circuit breakers, and are devices that require high reliability and responsiveness. These actuators regulate the speed and force of the mover through the interaction of magnets, springs, and coils, playing a key role in determining the performance of the circuit breaker.

[0003] Conventional permanent magnet actuators are primarily designed with internal springs and magnets secured using adhesive. While this design is suitable for meeting basic operating principles, it has limitations in terms of maintenance and design flexibility.

[0004] In other words, existing actuators are designed to meet the requirements of specific circuit breakers, and in most cases, such designs cannot be applied to other circuit breakers. For instance, a design that satisfies the opening and breaking speeds of a specific breaker often fails to meet the requirements of other breakers, necessitating new design and manufacturing.

[0005] [Prior Art Literature]

[0006] [Patent Literature]

[0007] (Patent Document 1) KR10-2017-0009348 A

[0008] Accordingly, the objective of the present invention is to solve such conventional problems by providing a linear actuator and a high-voltage circuit breaker utilizing the same, which can be applied to various high-voltage circuit breakers by enabling adjustment of operating conditions.

[0009] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below.

[0010] The above objective is achieved by a linear actuator according to the present invention, comprising: a stator having a coil to which current is applied; a permanent magnet fixed to the stator; a spring fixed to the stator; a mover disposed through the stator and formed to be movable along the axial direction of the stator by the current applied to the coil, the permanent magnet, and the spring; and a shaft disposed through the mover and moving together with the mover; wherein at least one of the elastic force of the spring and the magnetic force of the permanent magnet is formed to be adjustable.

[0011] The above spring can be formed to be replaceable.

[0012] The linear actuator according to the present invention further comprises: a base fixed to the lower end of the stator; a movable plate fixed to the upper end of the movable member; and a spring support shaft connecting the base and the movable plate, wherein the spring is fitted therein and its length is adjusted according to the change in length of the spring, and the spring support shaft may be formed to be detachably attached to at least one of the base and the movable plate.

[0013] The above spring support shaft may have its lower end hinged to the base and its upper end detachably formed to the movable plate.

[0014] The above spring support shaft may be provided with a spring release prevention cap at the upper end to prevent the spring from coming off.

[0015] The number of the above permanent magnets can be adjusted.

[0016] The above stator may have a plurality of permanent magnet mounting spaces on the outer surface of the core where the permanent magnet can be mounted.

[0017] The linear actuator according to the present invention may further include a permanent magnet fixing frame inserted into the permanent magnet mounting space.

[0018] The above permanent magnet fixing frame is provided with a plurality of permanent magnet mounting grooves into which one permanent magnet is inserted, and the permanent magnet may be formed to be detachably attached to the permanent magnet mounting groove.

[0019] According to another embodiment of the present invention, a high-voltage circuit breaker including the linear actuator described above is provided.

[0020] The high-voltage circuit breaker according to the present invention may have a plurality of the linear actuators arranged in series or in parallel.

[0021] The high-voltage circuit breaker according to the present invention may further include a control unit that controls whether and in what direction current is applied to the coil.

[0022] According to the linear actuator of the present invention, since at least one of the elastic force of the spring and the magnetic force of the permanent magnet is formed to be adjustable, it is possible to adjust the performance of the linear actuator.

[0023] Accordingly, the linear actuator of the present invention can have the flexibility to respond to various operating conditions.

[0024] The performance of the linear actuator according to the present invention can be easily adjusted by replacing the spring or adjusting the number of permanent magnets.

[0025] In addition, various effects according to the present invention may be mentioned together with the descriptions of the embodiments.

[0026] FIG. 1 is a cross-sectional view of a linear actuator according to the present invention.

[0027] FIG. 2 is a plan view of a linear actuator according to the present invention.

[0028] FIG. 3 is an explanatory diagram of the replacement of a spring in a linear actuator according to the present invention.

[0029] FIG. 4 is an explanatory diagram of a spring support shaft constituting a linear actuator according to the present invention.

[0030] FIG. 5 is an explanatory diagram of controlling the number of permanent magnets in a linear actuator according to the present invention.

[0031] FIG. 6 is an explanatory diagram of a permanent magnet fixing frame of a linear actuator according to the present invention.

[0032] FIG. 7 is a schematic diagram of a high-voltage circuit breaker equipped with a linear actuator according to the present invention.

[0033] In order to clarify the features and advantages of the means for solving the problem of the present invention, the present invention will be described in more detail with reference to specific embodiments of the present invention illustrated in the attached drawings.

[0034] However, detailed descriptions of known functions or configurations that may obscure the essence of the invention are omitted in the following description and the attached drawings. Additionally, it should be noted that identical components throughout the drawings are indicated by the same reference numerals whenever possible.

[0035] Terms and words used in the following description and drawings should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the invention and do not represent all aspects of the technical spirit of the invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0036] Furthermore, the terms used in this specification are used merely to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. Additionally, terms such as “comprising” or “having” described in this specification are intended to indicate the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0037] Additionally, “one (a or an),” “one,” “the,” and similar related terms may be used in the context describing the present invention (particularly in the context of the following claims) in a sense including both singular and plural, unless otherwise indicated in this specification or clearly contradicted by the context.

[0038] In addition to the terms described above, specific terms used in the following description are provided to aid in understanding the present invention, and the use of such specific terms may be modified in other forms without departing from the technical spirit of the present invention.

[0039]

[0040] Hereinafter, a linear actuator (10) according to the present invention and a high-voltage circuit breaker (1) using the same will be described.

[0041]

[0042] FIG. 1 shows a cross-sectional view of a linear actuator (10) according to the present invention, and FIG. 2 shows a plan view of a linear actuator (10) according to the present invention.

[0043] The linear actuator (10) according to the present invention basically comprises a stator (100), a permanent magnet (200), a spring (300), a mover (400), and a shaft (500).

[0044] The stator (100) includes a coil (110) to which current is applied, and when current flows through the coil (110), a magnetic force is generated to drive the mover (400). The stator (100) provides a structural base for fixing the permanent magnet (200) and the spring (300) and supports the stable movement of the mover (400). The stator (100) also induces axial movement of the mover (400) and the shaft (500).

[0045] The permanent magnet (200) is fixed to the stator (100) and provides a holding force for the mover (400). Specifically, the permanent magnet (200) can be fixed to the lower part of the stator (100) core.

[0046] The spring (300) supports the return movement of the mover (400) and provides elastic force to allow the mover (400) to return to its initial position after moving by the magnetic force of the stator (100). The spring (300) is fixed to the stator (100) but is fixed in a retractable state.

[0047] The mover (400) is positioned through the interior of the stator (100) and moves along the axial direction of the stator (100) by the interaction of the current applied to the coil (110), the magnetic force of the permanent magnet (200), and the elastic force of the spring (300). The mover (400) is coupled to the shaft (500) and serves to transmit physical operating force to an external system of the linear actuator (10) (e.g., a high-voltage circuit breaker).

[0048] The shaft (500) is positioned through the mover (400) and moves along the axial direction of the stator (100) together with the mover (400). The shaft (500) is connected to the mover (400) and serves to transmit physical force to an external system of the linear actuator (10).

[0049] In the linear actuator (10) according to the present invention, at least one of the elastic force of the spring (300) and the magnetic force of the permanent magnet (200) is formed to be adjustable. For example, the elastic force of the spring (300) can be adjusted by replacing the spring (300) or adjusting its strength, and the magnetic force of the permanent magnet (200) can be adjusted by adjusting its size, shape, or quantity.

[0050] It is desirable that the elastic force of the spring (300) and the magnetic force of the permanent magnet (200) be formed to be adjustable together.

[0051]

[0052] According to the linear actuator (10) of the present invention, at least one of the elastic force of the spring (300) and the magnetic force of the permanent magnet (200) is formed to be adjustable, so it is possible to adjust the performance of the linear actuator (10).

[0053] Accordingly, the linear actuator (10) of the present invention can have the flexibility to respond to various operating conditions.

[0054] For example, when the linear actuator (10) according to the present invention is applied to a high-voltage circuit breaker, the breaking speed, opening speed, and holding force can be optimized to meet the user's requirements. In other words, a single linear actuator (10) can be applied to various high-voltage circuit breakers.

[0055]

[0056] The elastic force of the spring (300) can be adjusted by forming the spring (300) replaceably in the linear actuator (10) according to the present invention.

[0057] As the spring (300) is formed to be replaceable, various springs (300) that provide elasticity suitable for the purpose can be selected and mounted on the actuator (10). For example, if a faster blocking speed is required, a spring (300) with stronger elasticity can be used, and conversely, if a smooth operation is required, a spring (300) with lower elasticity can be mounted.

[0058] In addition, by replacing the spring (300), the damaged spring (300) can be easily and quickly replaced when the spring (300) is damaged.

[0059]

[0060] In order to form a replaceable spring (300), specifically, the linear actuator (10) according to the present invention may further include a base (610), a moving plate (620), and a spring support shaft (630).

[0061] The base (610) is fixed to the bottom of the stator (100) and is formed in the shape of a plate that supports the stator (100). A hole may be formed in the center of the base (610) so that the base (610) and the shaft (500) do not interfere with each other.

[0062] The movable plate (620) is positioned spaced apart from the upper part of the base (610) and is fixed to the upper part of the movable member (400) so as to be able to move together with the movable member (400). The movable plate (620) is also formed in a plate shape, similar to the base (610). Additionally, a through hole may be formed in the center of the movable plate (620) so that the shaft (500) can pass through it.

[0063] The spring support shaft (630) is positioned between the base (610) and the movable plate (620) to connect the base (610) and the movable plate (620). For example, the spring support shaft (630) may be formed at the four corner portions of the base (610) and the movable plate (620) on the outside of the stator (100). The spring support shaft (630) is formed so that a spring (300) can be fitted into it, and its length can be adjusted as the spring (300) extends and retracts.

[0064] Specifically, the spring support shaft (630) may be equipped with a reference tube (631) and an adjustment rod (632). The reference tube (631) forms the lower end of the spring support shaft (630) and has a space in the center of the cross section into which the adjustment rod (632) can be inserted. The adjustment rod (632) forms the upper end of the spring support shaft (630) and is inserted into the reference tube (631) so as to be able to move along the reference tube (631) in the axial direction of the reference tube (631). The length of the spring support shaft (630) can be adjusted according to the length of the adjustment rod (632) inserted into the reference tube (631).

[0065] The spring (300) can be fitted to wrap around the adjustment member (632) of the spring support shaft (630). The spring (300) is formed such that its inner diameter is larger than the outer diameter of the adjustment member (632) and smaller than the outer diameter of the reference tube (631), so that its lower end can be supported by the upper end of the reference tube (631). The upper end of the spring (300) can support the movable plate (620). Accordingly, when the movable plate (620) moves downward together with the mover (400), the adjustment member (632) is further inserted into the reference tube (631) and the spring (300) can be compressed; and when the holding force on the mover (400) (movable plate (620)) is removed and the spring (300) is extended, the adjustment member (632) protrudes from the reference tube (631) and the movable plate (620) and the mover (400) can move upward.

[0066] The spring support shaft (630) can be formed to be detachably attached to at least one of the base (610) and the movable plate (620). Accordingly, it is possible to easily replace the spring (300) fitted onto the spring support shaft (630).

[0067] Meanwhile, since the spring support shaft (630) is located outside the stator (100), it is possible to facilitate the replacement of the spring (300), and unlike a linear actuator in which the spring is located inside the existing stator, a large space can be secured for the coil (110).

[0068] Since multiple spring support shafts (630) are provided, it is also possible to adjust the elasticity of the entire spring (300) by adjusting whether a spring (300) is inserted into each spring support shaft (630).

[0069]

[0070] The spring support shaft (630) may be formed such that its lower end is hinged to the base (610) and its upper end is detachably attached to the movable plate (620).

[0071] In this case, by adjusting the angle of the spring support shaft (630) relative to the base (610), the spring support shaft (630) can be made into a state where the spring (300) can be replaced or where it supports the movable plate (620). That is, as shown in FIG. 1, when the spring support shaft (630) is positioned vertically and its upper end is coupled to the movable plate (620), the spring (300) can support the movable plate (620), allowing the linear actuator (10) according to the present invention to operate, and as shown in FIG. 3, when the spring support shaft (630) is tilted and its upper end is detached from the movable plate (620), it is possible to perform the operation of replacing the spring (300).

[0072] Even when the upper end of the spring support shaft (630) is detached from the movable plate (620), the lower end is connected to the base (610), so it is possible to easily reconnect the spring support shaft (630) to the movable plate (620).

[0073] The lower surface of the movable plate (620) may be provided with a coupling groove (not shown) into which the upper end of the spring support shaft (630) is inserted. In this case, the angle can be prevented from easily changing due to external force while the spring support shaft (630) is coupled to the movable plate (620). Accordingly, the linear actuator (10) according to the present invention can operate stably. When the upper end of the spring support shaft (630) is detached from or inserted into the coupling groove, the adjustment rod (632) is pressed in the direction of the reference tube (631) to shorten the length of the spring support shaft (630), thereby allowing the operation to proceed easily.

[0074]

[0075] The spring support shaft (630) may be provided with a spring release prevention cap (633) that prevents the spring (300) from coming off at the upper end. An explanatory diagram of such a case is shown in FIG. 4.

[0076] The spring detachment prevention cap (633) is formed to have an outer diameter larger than the inner diameter of the spring (300), so as to prevent the spring (300) fitted onto the spring support shaft (630) from detaching from the spring support shaft (630).

[0077] This spring detachment prevention cap (633) is formed to be detachably attached to the spring support shaft (630), so that it can be removed from the spring support shaft (630) during the operation of replacing the spring (300), and fixed to the spring support shaft (630) after the operation of replacing the spring (300) is completed.

[0078] The spring support shaft (630) may also be equipped with a stop ring (634). The stop ring (634) can securely fix the spring anti-detachment cap (633) to the spring support shaft (630). For example, a thread may be formed on the upper outer surface of the spring support shaft (630), and the stop ring (634) may be screwed onto the upper end of the spring support shaft (630) to secure the spring anti-detachment cap (633) to the spring support shaft (630).

[0079]

[0080] In the linear actuator (10) according to the present invention, the number of permanent magnets (200) is adjustable so that the magnitude of the overall magnetic force can be adjusted. Fig. 5 illustrates an explanatory diagram for such a case.

[0081] That is, the stator (100) is formed to be able to fix a plurality of permanent magnets (200), and by adjusting the number of permanent magnets (200) fixed to the stator (100), the linear actuator (10) according to the present invention can be used in various operating environments.

[0082] Accordingly, the magnitude of the magnetic force can be easily adjusted by removing or adding a permanent magnet (200) to the stator (100).

[0083] When adjusting the number of permanent magnets (200) for the stator (100), it is preferable to arrange the permanent magnets (200) so that they are uniformly positioned on the circumference or axial direction of the stator (100) so that the magnetic force distribution in the linear actuator (10) according to the present invention can be uniform.

[0084]

[0085] The stator (100) may have a plurality of permanent magnet mounting spaces (120) on the outer surface of the core where permanent magnets (200) can be mounted.

[0086] In this case, the number of permanent magnets (200) can be adjusted by selecting whether to place permanent magnets (200) in each permanent magnet mounting space (120). And since the permanent magnet mounting space (120) is formed on the outer surface of the stator (100), it is possible to facilitate the installation and removal of permanent magnets (200).

[0087] It is desirable that each permanent magnet mounting space (120) be standardized to match the size and shape of the permanent magnet (200) so that the permanent magnet (200) can be stably fixed in the correct position of the stator (100).

[0088] The permanent magnet mounting space (120) can be standardized so that one or more permanent magnets (200) can be placed inside each.

[0089] It is preferable that the permanent magnet mounting space (120) be formed so as not to interfere with the stator core coupling bolt (130). The stator core coupling bolt (130) is used for structural coupling of the stator (100) core, and by alternately arranging the stator core coupling bolt (130) and the permanent magnet mounting space (120) on the circumference of the stator (100) core, physical interference between the stator (100) core coupling bolt and the permanent magnet (200) can be prevented. Accordingly, it is possible to stably mount the permanent magnet (200) to the stator (100) while maintaining structural stability of the stator (100) core.

[0090]

[0091] The linear actuator (10) according to the present invention may further include a permanent magnet fixing frame (700).

[0092] The permanent magnet fixing frame (700) is formed to allow a permanent magnet (200) to be mounted therein and is inserted into the permanent magnet mounting space (120). That is, the permanent magnet (200) can be placed in the permanent magnet mounting space (120) while mounted on the permanent magnet fixing frame (700).

[0093] The permanent magnet (200) can be more stably fixed in the permanent magnet mounting space (120) by means of such a permanent magnet fixing frame (700). The permanent magnet fixing frame (700) fixes the magnet so that it does not move or detach due to vibration, and can ensure uniformity of magnetic force distribution by accurately maintaining the position of the permanent magnet (200).

[0094] It is preferable that the permanent magnet fixing frame (700) be designed with a structure that makes it easy to insert or remove the permanent magnet (200), so that the user can simply replace the permanent magnet (200) using a tool.

[0095]

[0096] The permanent magnet fixing frame (700) is provided with a plurality of permanent magnet mounting grooves (710) into which one permanent magnet (200) is inserted, and the permanent magnet (200) can be formed to be detachably attached to the permanent magnet mounting grooves (710).

[0097] These permanent magnet fixing frames (700) allow the permanent magnets (200) to be positioned in the correct location simply by placing the permanent magnets (200) in each permanent magnet mounting groove (710), and allow the number of permanent magnets (200) to be easily adjusted. Also, since it is possible to insert one permanent magnet (200) into the permanent magnet mounting groove (710), even if the permanent magnets (200) are mounted in only some of the permanent magnet mounting grooves (710) and there are empty permanent magnet mounting grooves (710), each permanent magnet (200) can be stably fixed in the correct location.

[0098] The permanent magnet fixing frame (700) may be made modularly separable for each permanent magnet mounting groove (710), as shown in FIG. 6. This separable structure facilitates the mounting or removal of the permanent magnet (200) to the stator (100) and provides flexibility to replace the entire permanent magnet fixing frame (700) or to perform work only on specific permanent magnet mounting grooves (710).

[0099]

[0100] Hereinafter, a high-voltage circuit breaker (1) including a linear actuator (10) according to the present invention will be described. While describing the high-voltage circuit breaker (1) according to the present invention, detailed descriptions of matters mentioned during the description of the linear actuator (10) according to the present invention may be omitted.

[0101] FIG. 7 shows a schematic diagram of a high-voltage circuit breaker (1) according to the present invention.

[0102] The high-voltage circuit breaker (1) according to the present invention may comprise a linear actuator (10), a high-voltage box (20), a vacuum circuit breaker (30), a movable contact part (40), and a fixed contact part (50).

[0103] In FIG. 7, a three-phase high-voltage circuit breaker is illustrated as an example, and accordingly, a linear actuator (10), a vacuum circuit breaker (30), a movable contact part (40), and a fixed contact part (50) are formed for each phase (U phase, V phase, W phase).

[0104] The high-voltage box (20) serves as a housing, and a vacuum circuit breaker (30), a movable contact part (40), and a fixed contact part (50) are arranged within the high-voltage box (20). High-voltage gas may be filled within the high-voltage box (20) to extinguish the electrical arc generated when the high-voltage circuit breaker (1) operates and to enhance insulation performance, and the high-voltage box (20) is formed to maintain this high-voltage gas.

[0105] The vacuum circuit breaker (30) enables the contacts of the high-voltage circuit breaker (1) to operate in a vacuum state, and its interior is formed in a vacuum state. The ends of the movable contact portion (40) and the fixed contact portion (50) are located inside the vacuum circuit breaker (30) so that the contacts can operate in a vacuum state. Since the interior of the vacuum circuit breaker (30) is in a vacuum state, the arc generated when interrupting the current can be quickly extinguished.

[0106] The movable contact part (40) is connected to the shaft (500) of the linear actuator (10) according to the present invention and can move together as the mover (400) moves. That is, when the movable contact part (40) moves upward by the linear actuator (10), the contact is separated and the system connection is cut off, and when the movable contact part (40) moves downward and returns to its original position, the system connection is established and the linear actuator (10) is positioned in a standby state.

[0107]

[0108] The high-voltage circuit breaker (1) of the present invention can be applied to various operating conditions because the linear actuator (10) is formed such that at least one of the elastic force of the spring (300) and the magnetic force of the permanent magnet (200) is adjustable.

[0109] Specifically, the operating conditions can be easily adjusted by replacing the spring (300) or adjusting the number of permanent magnets (200).

[0110]

[0111] The high-voltage circuit breaker (1) according to the present invention may be equipped with a plurality of linear actuators (10) arranged in series or in parallel.

[0112] A plurality of linear actuators (10) connected in series operate individually but are connected along a single axis, allowing for greater operating force to be provided inside the high-voltage circuit breaker (1). That is, through the series configuration, the force generated by each actuator (10) is accumulated, so that it can operate effectively even under high voltage or large load conditions that a single actuator (10) cannot handle.

[0113] Linear actuators (10) arranged in parallel allow multiple actuators (10) to control the same contact or control independent contact groups. This configuration allows for simultaneous interruption and return operations in a multi-contact system, or enables the parallel management of multiple circuits within a high-voltage circuit breaker (1).

[0114] Multiple linear actuators (10) may be used in combination with series and parallel configurations to enhance the overall performance of the system. For example, in a high-voltage circuit breaker (1), some actuators (10) may be connected in series to provide high breaking power, while others may be connected in parallel to manage multiple circuits simultaneously. In this case, the performance of the high-voltage circuit breaker (1) can be maximized, and flexibility suitable for the various requirements of a large-scale power grid can be provided.

[0115]

[0116] The high-voltage circuit breaker (1) according to the present invention may include a control unit (20).

[0117] The control unit (20) can control whether and in what direction current is applied to the coil (110). That is, the control unit (20) has the role of applying or stopping current to the coil (110) of the stator (100), and can finely adjust the magnitude and direction of the current.

[0118] The control unit (20) is composed of components such as power electronic devices, microcontrollers, and sensors, and can control the operating state of the linear actuator (10) in real time according to external commands or sensor inputs.

[0119] This control unit (20) can accurately adjust the movement speed, driving force, and holding force of the mover (400) according to the operating conditions required by the linear actuator (10), thereby making the operation of the high-voltage circuit breaker (1) more precise.

[0120] Through this, the response speed of the high-voltage circuit breaker (1) is improved, and it can contribute to maintaining power grid stability.

[0121] The control unit (20) can reverse the direction of the current flowing through the coil (110) of the stator (100). Accordingly, the mover (400) can move between the two ends of the stator (100) according to the direction of the current, and the coil (110) can perform a cut-off and return operation by interacting with the force of the spring (300) and the permanent magnet (200). In addition, the movement speed and force of the mover (400) can be finely controlled by adjusting the magnitude of the current.

[0122] Additionally, the control unit (20) receives input from an internal sensor of the high-voltage circuit breaker (1) to detect a fault condition, and accordingly, can stop the operation of the linear actuator (10) or perform a cutoff operation. When a condition such as an overload or short circuit is detected, the control unit (20) can transmit an immediate cutoff signal to prevent damage to the power grid.

[0123]

[0124] Below, the operation process of the high-voltage circuit breaker (1) according to the present invention will be explained in detail.

[0125] First, in a normal standby state, the permanent magnet (200) provides a holding force to maintain the position of the mover (400). At this time, the permanent magnet (200) ensures that the position of the mover (400) is fixed at the bottom relative to the stator (100), and stably fixes the position of the mover (400) even when no external current is applied. The spring (300) is positioned in a compressed state in the standby state. In the standby state, the high-voltage circuit breaker (1) is positioned in a state of transmitting voltage.

[0126] In the present invention, the holding force can be adjusted by controlling the number of permanent magnets (200) and replacing the spring (300).

[0127] When high voltage interruption is required, current is applied to the coil (110). The direction and magnitude of the current are controlled by the control unit (20), and the magnetic force of the coil (110) of the stator (100) counteracts the magnetic force of the permanent magnet (200), causing the spring (300) to extend and move the mover (400) to the upper part. Due to the movement of the mover (400), the high voltage circuit breaker (1) performs the operation of disconnecting the electrical connection.

[0128] In the present invention, the speed (opening speed) of the high-voltage circuit breaker (1) can be adjusted by replacing the spring (300).

[0129] When restoring the high-voltage circuit breaker (1), the control unit (20) reverses the current direction of the coil (110). Due to the magnetic force generated by the coil (110) and the magnetic force of the permanent magnet (200), the mover (400) returns to its original position (lower position relative to the stator (100)), and the spring (300) is compressed again. Even if the current to the coil (110) is cut off, the mover (400) can be held in its original position by the magnetic force of the permanent magnet (200).

[0130]

[0131] The scope of the present invention is not limited to the embodiments described above but may be implemented in various forms of embodiments within the scope of the appended claims. It is deemed that the scope of the claims of the present invention includes various modifications that are possible by anyone with ordinary knowledge in the technical field to which the invention pertains, without departing from the essence of the invention claimed in the claims.

[0132] [Explanation of the symbol]

[0133] 1 : High voltage circuit breaker

[0134] 10: Linear actuator

[0135] 20 : Control unit

[0136] 100 : Stator

[0137] 110 : Coil

[0138] 120: Permanent magnet mounting space

[0139] 200 : Permanent magnet

[0140] 300 : Spring

[0141] 400 : Mover

[0142] 500 : Shaft

[0143] 610 : Base

[0144] 620 : Moving plate

[0145] 630: Spring-supported shaft

[0146] 633 : Spring anti-slip cap

[0147] 700 : Permanent magnet fixing frame

[0148] 710 : Permanent magnet mounting groove

Claims

1. A stator having a coil to which current is applied; A permanent magnet fixed to the above stator; A spring fixed to the above stator; A mover disposed through the stator and formed to be movable along the axial direction of the stator by a current applied to the coil, the permanent magnet, and the spring; and A shaft that is positioned through the aforementioned mover and moves together with the said mover; comprising A linear actuator characterized in that at least one of the elastic force of the spring and the magnetic force of the permanent magnet is formed to be adjustable.

2. In Paragraph 1, A linear actuator characterized in that the above spring is formed to be replaceable.

3. In Paragraph 2, A base fixed to the bottom of the above-mentioned stator; A movable plate fixed to the top of the above-mentioned movable member; It further includes a spring support shaft that connects the base and the movable plate, and into which the spring is fitted so that its length is adjusted according to the change in length of the spring. The above spring-supported shaft is, A linear actuator characterized by being formed to be detachably attached to at least one of the base and the movable plate.

4. In Paragraph 3, The above spring-supported shaft is, The bottom is hinged to the above base, and A linear actuator characterized in that the upper portion is formed to be detachably attached to the above-mentioned movable plate.

5. In Paragraph 4, The above spring-supported shaft is, A linear actuator characterized by having a spring release prevention cap at the upper portion that prevents the spring from coming off.

6. In Paragraph 1, A linear actuator characterized by the number of permanent magnets being adjustable.

7. In Paragraph 6, The above stator is, A linear actuator characterized by having a plurality of permanent magnet mounting spaces on the outer surface of the core in which the permanent magnet can be mounted.

8. In Paragraph 7, A linear actuator characterized by further including a permanent magnet fixing frame inserted into the above-mentioned permanent magnet mounting space.

9. In Paragraph 8, The above permanent magnet fixing frame is, The above-mentioned permanent magnet is provided with a plurality of permanent magnet mounting grooves into which one permanent magnet is inserted, and The above permanent magnet is, A linear actuator characterized by being formed to be detachably attachable to the above-mentioned permanent magnet mounting groove.

10. A high-voltage circuit breaker comprising a linear actuator according to any one of claims 1 to 9.

11. In Paragraph 10, A high-voltage circuit breaker having a plurality of the above linear actuators arranged in series or parallel.

12. In Paragraph 10, A high-voltage circuit breaker characterized by further including a control unit that controls whether and in what direction current is applied to the above-mentioned coil.

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