Low-power-consumption bistable electromagnetic actuator for valve
By using a permanent magnet structure and a composite magnetic circuit design, the electromagnetic actuator can achieve self-holding and active switching in steady-state position, solving the problems of high power consumption and easy jamming in the existing technology, and improving the output force amplitude and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-03-13
AI Technical Summary
Existing electromagnetic actuators still consume electrical energy in steady-state positions and cannot achieve active switching between steady-state positions. Furthermore, the introduction of permanent magnets cannot balance steady-state holding force and motion output force.
The design employs a permanent magnet structure, which achieves bidirectional self-holding through the residual magnetic force of the permanent magnet. Combined with the axially symmetrical arrangement of coils and permanent magnets, a composite magnetic circuit is constructed to achieve active switching between steady-state positions. Furthermore, the magnetic flux density is increased by optimizing the air gap structure.
It eliminates energy consumption in steady-state positions, reduces the overall power consumption of electromagnetic actuators, enables bidirectional active switching between steady-state positions, and reduces the probability of armature jamming in deep-sea ultra-high-pressure environments.
Smart Images
Figure CN121662545A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-pressure valve technology, and in particular to a low-power bistable electromagnetic actuator for valves. Background Technology
[0002] Solenoid directional valves are commonly used linear solenoid control valves. They control the flow direction of the medium by moving the valve core through the engagement and disengagement of an electromagnetic actuator. In hydraulic / pneumatic circuits, the basic function of a solenoid directional valve is to control the flow direction of the medium by controlling the opening / closing of the medium passage. The main working principle is to use the electromagnetic force generated by the electromagnetic coil to drive the valve core, thus switching the flow direction of the medium. The working states of a valve's electromagnetic actuator include the active phase and steady state. When a step voltage signal is input to the coil of the electromagnetic actuator, causing the armature to move, there is a functional conversion efficiency in the process of converting electrical energy input into mechanical work output. In the steady state, the armature does not move, and all electrical energy input is converted into copper losses. Therefore, under certain structural dimensions and the same output capacity, methods to reduce the power consumption (i.e., electrical energy input) of the electromagnetic actuator include: firstly, reducing / eliminating the copper losses consumed in the steady state; and secondly, improving the functional conversion efficiency.
[0003] The DG4VL series electromagnetic actuators developed by TOKIMEC of Japan are representative of low-current self-holding and low-power technology. By reducing the system current during steady-state holding, they reduce overall operating power consumption to some extent. However, they still consume electrical energy in the steady-state position, where no mechanical work output is required, and they cannot achieve power-off self-locking functionality in the steady-state position. Domestically produced FMZ-6 bistable electromagnetic actuators and electromagnetic drive valves designed by Jinho Kim of the United States are representative of permanent magnet passive holding and low-power technology. They directly provide steady-state holding force through permanent magnets, eliminating the energy consumption required for traditional electromagnets to maintain valve core position. However, neither can achieve active switching between two steady-state positions; they require hydraulic force provided by the working fluid or a mechanical spring to achieve the transition. Furthermore, previous passive holding technologies using permanent magnets were limited by structural dimensions. Introducing permanent magnets often resulted in an inability to balance steady-state holding force and motion output force, significantly restricting their application scenarios.
[0004] Therefore, the following problems exist in the existing technology: Even in a steady-state position where no mechanical work output is required, electrical energy is still consumed, and the power-off self-locking function in a steady-state position cannot be achieved. It is impossible to actively switch between two steady-state positions. After introducing permanent magnets, it is usually impossible to balance steady-state holding force and motion output force. Summary of the Invention
[0005] To address this issue, the present invention provides a low-power bistable electromagnetic actuator for valves, which overcomes the problem in the prior art that it still requires power consumption in the steady-state position and cannot achieve active switching between the two steady-state positions.
[0006] To achieve the above objectives, the present invention provides a low-power bistable electromagnetic actuator for valves, comprising: The main body of the housing is a cubic structure, used to house the other components of the electromagnetic actuator, to introduce control wiring and to allow output components to pass through; A stator assembly includes an axially symmetrically arranged annular coil device for generating armature flux to control the lateral movement of the output component, and the control wiring is used to control the timing of the armature flux generation by the coil device. The central core assembly includes a permanent magnet device capable of generating permanent magnet flux, which is located at the symmetrical center of the symmetrically arranged annular coil device, and is used to electromagnetically fix the output component after the lateral movement is completed. The armature assembly, used to drive the output component to retract into or out of the main body of the housing under the action of the armature magnetic flux, performs valve switching control actions. It is located inside the stator assembly and passes through the central core assembly.
[0007] Furthermore, the stator assembly includes: The rear stator assembly, located on the left side inside the main housing, includes a ring coil device capable of generating armature magnetic flux and a rear stator core covering the outside of the coil device. The front stator assembly, located on the right side inside the main housing, includes a ring coil device capable of generating armature magnetic flux and a front stator core covering the outside of the coil device. The rear stator assembly and the front stator assembly are arranged axially symmetrically, and the coil device is connected to the control wiring.
[0008] Furthermore, a detachable front stator end cover connected to the outside of the front stator core is provided on one side of the main body of the housing, and a rear stator end cover connected to the inside of the rear stator core is provided on one side of the rear stator assembly. The front stator end cover and the rear stator end cover form trapezoidal protrusions towards the inside of the housing body.
[0009] Furthermore, the armature assembly includes an armature kit forming the exterior of the armature assembly and a magnetic shielding copper sleeve located inside the central iron core assembly, as well as a mover armature located inside the armature kit and passing through the magnetic shielding copper sleeve, and an output shaft located at the center of the mover armature and passing through the front stator assembly. The armature assembly and the mover armature form a trapezoidal recess, the shape of which matches the shape of the trapezoidal protrusion.
[0010] Furthermore, there is an air gap between the stator assembly and the portion of the armature assembly located inside the stator assembly, and the armature assembly can be moved to a stable left position that fits against the trapezoidal protrusion of the front stator end cover or a stable right position that fits against the trapezoidal protrusion of the rear stator end cover.
[0011] Furthermore, the central iron core assembly consists of a ring-shaped permanent magnet device and two central iron cores, which are respectively located on both sides of the permanent magnet device.
[0012] Furthermore, the permanent magnet device can generate permanent magnet flux to fix the armature assembly in the left-end steady-state position or the right-end steady-state position.
[0013] Furthermore, when the armature assembly is in the left end steady position or the right end steady position, the output shaft retracts into or extends from the front stator end cover to perform valve switching control actions.
[0014] Furthermore, the center of the front stator end cover has a front through hole for the output component to pass through; The trapezoidal protrusion has a rear through hole in its center, and a plug is embedded inside the center of the rear stator end cover. The plug is located to the left of the rear through hole, and an air gap is left between the plug and the rear through hole.
[0015] Furthermore, the four corners of the front stator end cover and the core of the front stator core are provided with threaded holes, and the front stator end cover and the front stator core are fixedly connected to the main body of the housing by screws.
[0016] Compared with the prior art, the beneficial effects of the present invention are that it eliminates the energy consumption required for the traditional electromagnet to maintain the steady position of the valve core and reduces the overall operating power consumption of the electromagnetic actuator; it constructs a new composite magnetic circuit under the dual action of a constant magnetic source and an electromagnetic field to realize bidirectional active switching between steady positions; and it designs and optimizes the working air gap structure and the mover armature topology to increase the air gap magnetic flux density in a limited space and improve the dynamic output force amplitude.
[0017] The low-power technology of this device is characterized by the use of a permanent magnet structure to achieve bidirectional self-holding. After completing the opening / closing action, the residual magnetic force of the magnet locks the armature in its final working position without requiring additional excitation, thus eliminating the energy consumption required for traditional electromagnets to maintain the valve core position. The magnetically shielding copper sleeve used has a self-lubricating effect, and combined with the high-rigidity iron core structure design, it can significantly reduce the probability of structural jamming of the armature movement in the ultra-high pressure environment of the deep sea. Simultaneously, during the controlled release movement of the armature, the armature magnetic flux generated by the coil does not directly pass through the permanent magnet structure, which can prevent the permanent magnet from being irreversibly demagnetized by the armature magnetic field under high output force.
[0018] Furthermore, addressing the issues of high power consumption, low output force density, and susceptibility to jamming in miniaturized electromagnetic actuators for deep-sea ultra-high-pressure valves, this device introduces permanent magnets based on the interaction law between magnetic poles, designing a composite magnetic circuit electromagnetic actuator under the coupling of a constant magnetic source and electromagnetic field. Its low-power technology is characterized by the use of a permanent magnet structure to achieve bidirectional self-holding without external force. After completing the opening / closing action, the residual magnetic force of the permanent magnet locks the armature in its final working position without additional excitation, thus eliminating the energy consumption required for traditional electromagnets to maintain the valve core position. Simultaneously, by axially symmetrically arranging the coil and permanent magnet, active switching between two steady-state positions can be achieved without the need for mechanical structures. Finally, by designing and optimizing the variable working air gap structure, the air gap magnetic flux density is increased within a limited space, improving the starting magnetic force amplitude and effectively preventing armature jamming under ultra-high internal pressure. At the same time, the smooth electromagnetic force output characteristics reduce the impact on the valve core. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 2 This is a side cross-sectional view of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 3 This is a top view of a cross-sectional diagram of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 4 This is an exploded view of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 5 This is an exploded view of the structure of the central core assembly and armature assembly in an embodiment of the present invention; Figure 6 This is an exploded view of the rear stator assembly in an embodiment of the present invention; Figure 7 This is an exploded view of the front stator assembly and the front stator end cap in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the working principle of the bistable electromagnetic actuator in an embodiment of the present invention. Figure 9 This is a schematic diagram of the magnetic path of the bistable electromagnetic actuator in an embodiment of the present invention; In the diagram: 1-Main body of the housing, 2-Rear stator assembly, 3-Middle core assembly, 4-Armature assembly, 5-Front stator assembly, 6-Oil plug, 7-Control wiring, 8-Cylindrical pin, 9-Air gap, 10-Middle core, 11-Permanent magnet, 12-Screw, 13-Rear stator core, 14-Skeleton coil, 15-Washer, 16-Front stator core, 17-Rear stator end cover, 18-Front stator end cover, 41-Output shaft, 42-Armature assembly, 43-Magnetic shielding copper sleeve, 44-Motor armature. Detailed Implementation
[0020] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.
[0021] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0022] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.
[0023] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0024] Please see Figures 1-9 As shown, Figure 1 This is a schematic diagram of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 2 This is a side cross-sectional view of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 3 This is a top view of a cross-sectional diagram of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 4 This is an exploded view of the bistable electromagnetic actuator in an embodiment of the present invention; Figure 5 This is an exploded view of the structure of the central core assembly and armature assembly in an embodiment of the present invention; Figure 6 This is an exploded view of the rear stator assembly in an embodiment of the present invention; Figure 7 This is an exploded view of the front stator assembly and the front stator end cap in an embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the working principle of the bistable electromagnetic actuator in an embodiment of the present invention. Figure 9 This is a schematic diagram of the magnetic path of the bistable electromagnetic actuator in an embodiment of the present invention.
[0025] This invention provides a low-power bistable electromagnetic actuator for valves, comprising: The housing body 1 is a cubic structure used to house the other components of the electromagnetic actuator, and to introduce the control wiring 7 and allow the output components to pass through. The stator assembly includes an axially symmetrically arranged annular armature assembly, the armature assembly being used to generate armature flux to control the lateral movement of the output member, and the control wiring 7 being used to control the timing of the armature flux generation by the armature assembly; The central core assembly 3 includes a permanent magnet device capable of generating permanent magnet flux, which is located at the symmetrical center of the symmetrically arranged annular armature assembly and is used to electromagnetically fix the output component after the lateral movement is completed. The armature assembly 4 is used to drive the output component to retract into or out of the main body 1 of the housing under the action of the armature magnetic flux to perform valve switching control action. It is located inside the stator assembly and passes through the central iron core assembly 3.
[0026] In this embodiment, the valve electromagnetic actuator is a device that uses electromagnetic force to drive the opening and closing of a valve. It is mainly used for quickly switching fluid media and can control the flow rate or pressure of the media by adjusting the valve opening.
[0027] In this embodiment, the output component is the output shaft 41, the armature assembly is the skeleton coil 14, and the permanent magnet device is the permanent magnet 11.
[0028] The main body 1 of the casing has, from left to right, a rear stator assembly 2, a middle iron core assembly 3, an armature assembly 4, and a front stator assembly 5.
[0029] Specifically, the beneficial effects of this device are to eliminate the energy consumption required by traditional electromagnets to maintain the steady position of the valve core and reduce the overall operating power consumption of the electromagnetic actuator; to construct a new composite magnetic circuit under the dual action of a constant magnetic source and an electromagnetic field, so as to realize bidirectional active switching between steady positions; and to design and optimize the structure of the working air gap 9 and the topology of the mover armature 44, thereby increasing the magnetic flux density of the air gap 9 in a limited space and improving the dynamic output force amplitude.
[0030] The armature assembly 4 includes an armature kit 42 forming the exterior of the armature assembly 4 and a magnetic shielding copper sleeve 43 located inside the central iron core assembly 3, as well as a mover armature 44 located inside the armature kit 42 and passing through the magnetic shielding copper sleeve 43, and an output shaft 41 located at the center of the mover armature 44 and passing through the front stator assembly 5. The armature kit 42 is located on both sides of the central iron core assembly 3, and the mover armature 44 is located inside the rear stator assembly 2 and the front stator assembly 5. The armature assembly 42 and the mover armature 44 form a trapezoidal recess.
[0031] The central core assembly 3 consists of a ring-shaped permanent magnet 11 and two central cores 10. The two central cores 10 are respectively located on both sides of the permanent magnet 11 and are kept coaxial with the permanent magnet 11 by a cylindrical pin 8. The permanent magnet 11 can generate permanent magnet flux. When the armature assembly 4 is located at the left end inside the rear stator assembly 2, the permanent magnet flux generates a leftward steady-state holding force on the armature assembly 4. When the armature assembly 4 is located at the right end, the permanent magnet flux generates a rightward steady-state holding force on the armature assembly 4. Specifically, the permanent magnet 11 generates an attractive force on the armature assembly 4 through the permanent magnet flux, thereby fixing the armature assembly 4 and the permanent magnet 11 relative to each other.
[0032] The rear stator assembly 2 and the front stator assembly 5 are three-layer ring structures. The rear stator assembly 2 includes a rear stator core 13, a bobbin coil 14 and a gasket 15 from the outside to the inside. The front stator assembly 5 includes a front stator core 16, a bobbin coil 14 and a gasket 15 from the outside to the inside. The skeleton coils 14 of the rear stator assembly 2 and the front stator assembly 5 are arranged axially symmetrically. The skeleton coils 14 are connected to the control wiring 7 and can generate armature magnetic flux under the control timing of the control wiring 7.
[0033] like Figure 8 and Figure 9 As shown, the process of the armature assembly 4 moving from the left end steady-state position to the right end steady-state position is as follows: when the axially symmetrical skeleton coil 14 is simultaneously excited in the opposite direction, an armature magnetic flux is generated. Under the action of the armature magnetic flux, an electromagnetic force is generated to control the armature assembly 4 to move to the right, which cancels the electromagnetic force generated by the permanent magnet flux and releases the armature assembly 4. The armature assembly 4 begins to move to the right until it reaches the right end steady-state position. At this time, the skeleton coil 14 stops being energized, and the armature assembly 4 remains in a stable position on the right end under the action of the permanent magnet flux.
[0034] The process of the armature assembly 4 moving from the right-end steady-state position to the left-end steady-state position is as follows: The axially symmetrical skeleton coil 14 changes the direction of magnetic flux and simultaneously generates armature magnetic flux in the opposite direction. Under the action of the armature magnetic flux, an electromagnetic force is generated to control the armature assembly 4 to move to the left. The armature assembly 4 moves to the left until it reaches the left end steady position. At this time, the skeleton coil 14 stops being excited, and the armature assembly 4 remains in the left end steady position under the action of permanent magnet flux.
[0035] In the diagram, the dashed and solid lines represent the magnetic path of the permanent magnet, the dotted lines represent the electromagnetic path, and the arrows indicate the direction of the magnetic flux.
[0036] Specifically, the low-power technology of this device is characterized by the use of a permanent magnet structure to achieve bidirectional self-holding. After completing the opening / closing action, the residual magnetic force of the magnet locks the armature in its final working position without requiring additional excitation, thus eliminating the energy consumption required for traditional electromagnets to maintain the valve core position. The magnetically shielding copper sleeve 43 has a self-lubricating effect, and combined with the high-rigidity iron core structure design, it can significantly reduce the probability of structural jamming of the armature movement in the ultra-high pressure environment of the deep sea. Simultaneously, during the controlled release movement of the armature, the armature magnetic flux generated by the coil does not directly pass through the permanent magnet structure, preventing irreversible demagnetization of the permanent magnet under high output force conditions due to the armature magnetic field.
[0037] The main body 1 of the housing is provided with a detachable front stator end cover 18 connected to the outside of the front stator core 16. The front stator end cover 18 has a front through hole in the center. The four corners of the front stator end cover 18 and the core of the front stator core 16 are provided with threaded holes. The front stator end cover 18 and the front stator core 16 are fixedly connected to the main body of the housing by screws 12. The front stator end cover 18 has a trapezoidal protrusion in the middle towards the interior of the front stator assembly 5, and the shape of the trapezoidal protrusion fits the trapezoidal recess formed by the armature assembly 42 and the mover armature 44. The rear stator assembly 2 has a rear stator end cover 17 connected to the inner side of the rear stator core 13 on one side. The rear stator end cover 17 has a trapezoidal protrusion in the middle towards the interior of the rear stator assembly 2. The shape of the trapezoidal protrusion fits the trapezoidal recess formed by the armature assembly 42 and the mover armature 44. The trapezoidal protrusion has a rear through hole in the center. The rear stator end cover 17 has a plug 6 embedded in its center. The plug 6 is located on the left side of the rear through hole, and an air gap 9 is left between the plug 6 and the rear through hole. The output shaft 41 of the armature assembly 4 passes through the center of the front stator assembly 5 from the right side of the mover armature 44 and exits through the front through hole of the front stator end cover 18.
[0038] The composite magnetic circuit in this embodiment consists of a permanent magnet 11, two sets of skeleton coils 14, two sets of stator cores, and an armature assembly 4.
[0039] Specifically, this device addresses the problems of high power consumption, low output force density, and easy jamming in miniaturized electromagnetic actuators used in deep-sea ultra-high pressure valves. Based on the interaction law between magnetic poles, a permanent magnet is introduced to design a composite magnetic circuit electromagnetic actuator under the coupling effect of a constant magnetic source and electromagnetic field. Its low power consumption technology is characterized by the use of a permanent magnet structure to achieve bidirectional self-holding. That is, after completing the opening / closing action, the residual magnetic force of the permanent magnet locks the armature in the final working position without the need for additional excitation, thereby eliminating the energy consumption required by traditional electromagnets to maintain the valve core position. At the same time, by axially symmetrically arranging the coil and permanent magnet, active switching between two steady-state positions can be achieved without the need for mechanical structures. Finally, by designing and optimizing the variable working air gap 9 structure, the magnetic flux density of the air gap 9 is increased in a limited space, improving the starting magnetic force amplitude and effectively preventing the armature from jamming under ultra-high internal pressure. At the same time, the smooth electromagnetic force output characteristics reduce the impact on the valve core.
[0040] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.
[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., 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 low-power bistable electromagnetic actuator for valves, characterized in that, include: The main body of the housing is a cubic structure, which is used to introduce control wiring on one side of the cubic structure and allow output components to pass through on the other side of the cubic structure; The stator assembly includes an axially symmetrically arranged annular armature assembly, the armature assembly being used to generate armature flux to control the lateral movement of the output member, and the control wiring being used to control the timing of the armature flux generation by the armature assembly. The central core assembly includes a permanent magnet device capable of generating permanent magnet flux, which is located at the symmetrical center of the symmetrically arranged annular armature assembly, for electromagnetically fixing the output component after the lateral movement is completed. The armature assembly is used to drive the output component to retract into or out of the main body of the housing under the action of the armature magnetic flux to perform valve switching control action. It is located inside the stator assembly and passes through the central iron core assembly. The stator assembly further includes a rear stator assembly and a front stator assembly; The rear stator assembly, located on the left side inside the main housing, includes an annular armature assembly capable of generating armature flux and a rear stator core covering the outside of the armature assembly. The front stator assembly, located on the right side inside the main housing, includes a ring armature assembly capable of generating armature flux and a front stator core covering the outside of the armature assembly. The rear stator assembly and the front stator assembly are arranged axially symmetrically, and the armature assembly is connected to the control wiring.
2. The low-power bistable electromagnetic actuator for valves according to claim 1, characterized in that, The main body of the housing is provided with a detachable front stator end cover connected to the outside of the front stator core on one side, and a rear stator end cover connected to the inside of the rear stator core on one side of the rear stator assembly. The front stator end cover and the rear stator end cover form trapezoidal protrusions towards the inside of the housing body.
3. The low-power bistable electromagnetic actuator for valves according to claim 2, characterized in that, The armature assembly includes an armature kit forming the exterior of the armature assembly and a magnetic shielding copper sleeve located inside the central iron core assembly, as well as a mover armature located inside the armature kit and passing through the magnetic shielding copper sleeve and an output shaft located at the center of the mover armature and passing through the front stator assembly. The armature assembly and the mover armature form a trapezoidal recess, the shape of which matches the shape of the trapezoidal protrusion.
4. The low-power bistable electromagnetic actuator for valves according to claim 2, characterized in that, There is an air gap between the stator assembly and the portion of the armature assembly located inside the stator assembly. The armature assembly can move to a stable left position that fits against the trapezoidal protrusion of the front stator end cover or a stable right position that fits against the trapezoidal protrusion of the rear stator end cover.
5. The low-power bistable electromagnetic actuator for valves according to claim 4, characterized in that, The central core assembly consists of a ring-shaped permanent magnet device and two central cores, which are respectively located on both sides of the permanent magnet device.
6. The low-power bistable electromagnetic actuator for valves according to claim 5, characterized in that, The permanent magnet device can generate permanent magnet flux to fix the armature assembly in the left or right stable position.
7. The low-power bistable electromagnetic actuator for valves according to claim 4, characterized in that, The output shaft retracts into or extends from the front stator end cover to perform valve switching control actions when the armature assembly is in the left or right steady-state position.
8. The low-power bistable electromagnetic actuator for valves according to claim 7, characterized in that, The front stator end cover has a front through hole in the center for the output component to pass through; The trapezoidal protrusion has a rear through hole in the center, and a plug is embedded inside the center of the rear stator end cover. The plug is located to the left of the rear through hole, and an air gap is left between the plug and the rear through hole.
9. The low-power bistable electromagnetic actuator for valves according to claim 8, characterized in that, The four corners of the front stator end cover and the core of the front stator core are provided with threaded holes, and the front stator end cover and the front stator core are fixedly connected to the main body of the housing by screws.