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CN-121993650-A - Electromagnetic linear actuator

CN121993650ACN 121993650 ACN121993650 ACN 121993650ACN-121993650-A

Abstract

The present invention relates to an electromagnetic linear actuator for moving a rod in an axial direction relative to a support structure. The electromagnetic actuator comprises an excitation coil wound around a circumferential direction (C) perpendicular to the axial direction (a), a fixed core located at a first axial end of the coil and fixed to the support structure, and a rod moving means comprising a rod moving core arranged at a second axial end of the coil and adapted to be attached to the rod. The rod moving core moves between an open position when the coil is not energized and a closed position when the coil is energized. The open position and the closed position are spaced apart in the axial direction (a) by a lever movement distance (d_rod). The electromagnetic actuator further includes a damper device including a damper core disposed between the fixed core and the rod moving core.

Inventors

  • H. Fangtesi
  • A. P. Duarte Silva
  • V. Moreira
  • M. CROCKER

Assignees

  • 泰科电子机电元件有限公司
  • 泰科电子连接解决方案有限责任公司

Dates

Publication Date
20260508
Application Date
20251105
Priority Date
20241108

Claims (15)

  1. 1. An electromagnetic linear actuator (10) for moving a rod (300) in an axial direction (a) relative to a support structure (600), the electromagnetic actuator comprising: an exciting coil (400) wound around a circumferential direction (C) perpendicular to the axial direction (A); A stationary core (500) located at a first axial end of the coil (400) and fixed to the support structure (600); a rod moving apparatus including a rod moving core (100) disposed at a second axial end of a coil (400) and adapted to be attached to a rod (300), The rod moving core (100) moves between an open position when the coil (400) is not energized and a closed position when the coil (400) is energized, The open position and the closed position are spaced apart in the axial direction (a) by a lever movement distance (d_rod); A shock absorbing device includes a shock absorbing core (200) disposed between a fixed core (500) and a rod moving core (100), The damper core (200) moves between a stop position, in which the damper core (200) is held by a holding force, and a release position, in which the damper core (200) enables the rod moving core (100) to move to a closed position when the coil (400) is energized, The stop position and the release position being spaced apart in the axial direction (A) by a damping distance (d_shock), and Wherein the shock absorption distance (d_shock) is less than or equal to the rod movement distance (d_rod).
  2. 2. The electromagnetic linear actuator (10) of claim 1, wherein the rod moving core (100) is spaced apart from the shock absorbing core (200) and the shock absorbing core (200) is spaced apart from the stationary core (500) when the rod moving core (100) is in the open position, and the retaining force is for preventing the rod moving core (100) from moving in the closed position when the coil (400) is not energized.
  3. 3. The electromagnetic linear actuator (10) according to any one of the preceding claims, when the lever moving core (100) is in the closed position, the lever moving core (100) contacts the shock absorbing core (200) and the shock absorbing core (200) contacts the stationary core (500).
  4. 4. The electromagnetic linear actuator (10) according to any one of the preceding claims, wherein the shock absorbing core (200) and the stationary core (500) comprise a planar surface (214,514) extending perpendicular to the axial direction (a) for mutual contact when the shock absorbing core (200) is in a released position, optionally wherein the planar surface (214,514) is arranged in a central region within the coil (400).
  5. 5. The electromagnetic linear actuator (10 ") of any one of the preceding claims, each of the shock absorbing core (200) and the rod moving core (100) comprising a tapered surface (216,116) that is chamfered in the axial direction (a) for contacting each other when the rod moving core (100) is in a closed position.
  6. 6. The electromagnetic linear actuator (10) according to any one of the preceding claims, wherein the rod moving arrangement further comprises a retaining spring (110) for pushing the rod moving core (100) with a retaining force to an open position when the coil (400) is not energized, optionally wherein the retaining spring (110) is attached to the rod moving core (100) and the stationary core (500).
  7. 7. The electromagnetic linear actuator (10 ') according to any one of the preceding claims, wherein the damping device further comprises a force adjustment element (210, 210') for pushing the damping core (200) with a force in the direction of the rod moving the core.
  8. 8. The electromagnetic linear actuator (10 ') according to claim 7, wherein the force adjustment element comprises at least one of a force adjustment spring (210), preferably attached to the shock absorbing core (200) and the stationary core (500), and a permanent magnet (210'), preferably arranged between the rod moving core (100) and the shock absorbing core (200), the shock absorbing core (200) for receiving momentum in case of shock.
  9. 9. The electromagnetic linear actuator (10') according to claims 6 to 8, wherein the force adjustment spring (210) has a different spring rate than the holding spring (110), optionally wherein the force adjustment spring (210) surrounds the holding spring (110) in a circumferential direction (C).
  10. 10. The electromagnetic linear actuator (10, 10') according to any one of the preceding claims, wherein the shock absorbing core (200) comprises a stationary core protrusion (220) extending in a radial direction (R) perpendicular to the axial direction (a), the stationary core protrusion (220) restricting movement of the shock absorbing core (200) in the direction of the stop position in a stop position, optionally wherein a force adjusting spring (210) of claim 8 is attached to the stationary core protrusion (220) and a stationary core (500) of the shock absorbing core.
  11. 11. The electromagnetic linear actuator (10) according to any one of the preceding claims, wherein the support structure (600) comprises a stationary support protrusion (620) extending in a radial direction (R) perpendicular to the axial direction (a), the stationary support protrusion (620) restricting the movement of the shock-absorbing core (200) in the direction of the stop position in the stop position such that the shock-absorbing distance (d_shock) is smaller than the rod movement distance (d_rod).
  12. 12. The electromagnetic linear actuator (10) according to any one of the preceding claims, wherein the shock absorbing core (200) is spaced apart from the rod (300), optionally wherein the shock absorbing core (200) comprises a through hole (212) and the rod (300) is guided in the through hole (212).
  13. 13. The electromagnetic linear actuator (10) according to any one of the preceding claims, wherein the support structure (600) comprises a core guiding portion (610) for guiding the rod moving core (100) to move along an axial direction (a), optionally wherein the core guiding portion (610) comprises a hole (612), and the rod moving core (100) is guided in the hole (612), optionally wherein the core guiding portion (610) of the support structure (600) comprises a ferromagnetic material and/or Wherein the stationary core (500) comprises a rod guiding portion (512) for guiding the rod (300) in the axial direction (a), optionally wherein the stationary core (500) comprises a through hole (512) and the rod (300) is guided in the through hole (512).
  14. 14. The electromagnetic linear actuator (10) according to any one of the preceding claims, further comprising a lever (300) attached to the lever moving core (100), wherein the lever (300) comprises a limiting protrusion (310) extending in a radial direction (R) perpendicular to the axial direction (a), the limiting protrusion (310) limiting movement of the lever (300) in the direction of the open position in the open position.
  15. 15. A switch for switching a circuit, the switch comprising an electromagnetic linear actuator (10) according to any one of the preceding claims.

Description

Electromagnetic linear actuator Technical Field The present invention relates to an electromagnetic linear actuator. Background For example, as shown in fig. 17, an electromagnetic actuator 1000 is a device that converts electric energy into mechanical motion by using electromagnetic principles. The linear actuator produces a linear movement, here along the axial direction a. Here, the rod 1300 is a long and thin rod designed to withstand forces and transfer loads in a mechanical system, the rod 1300 being arranged within the electromagnetic actuator 1000 and being moved by the electromagnetic actuator in the axial direction a. To move the rod 1300, the electromagnetic actuator includes an electromagnet that is generated by passing an electric current through the coil 1400. The coil 1400 is wound around the circumferential direction C, for example, so as to surround at least a portion of the rod 1300. Coil 1300 generates magnetic flux B. The magnetic flux density is generally represented by a vector field, the vector being represented by symbol B, and is a measure of the strength and direction of the magnetic field at a particular point. The magnetic flux B generated may interact with ferromagnetic materials (e.g., iron or steel) to generate forces that may move these materials. Depending on the design of the actuator, the magnetic flux B attracts or repels the movable core 1100. This movement may be used to perform mechanical work, namely moving the rod 1300. Thus, the electromagnetic actuator may move the contacts of, for example, an electrical switch. Electromagnetic actuators may also be used for purposes such as moving a valve, pressing a button, or driving a linear mechanism. In general, electromagnetic linear actuators facilitate high precision and control, fast response times, high efficiency in converting electrical energy into mechanical energy, smooth and continuous motion, low maintenance, quiet operation, and high force densities, as compared to other actuation devices. Depending on the application, the electromagnetic actuator may need to meet further requirements. For example, the requirement may relate to a lever travel distance, as shown in fig. 17, which is the distance between an open position when the coil is not energized and a closed position when the coil is energized. The lever movement distance is, for example, predetermined. Thus, it is ensured that the contacts of the switch are sufficiently spaced apart in the open position. Further, in consideration of external impact, impact resistance to maintain the open position (i.e., when the coil is not energized) may be defined. As used herein, a mechanical shock is a sudden and often extreme force or shock applied to an electromagnetic actuator. It generally involves rapid changes in speed, i.e., acceleration, in a very short time, such as by moving an actuator from an open position to a closed position, causing stress and potential damage to components of the system. For example, switches such as high voltage contactors must withstand mechanical shocks of up to 90 g. In other words, the acceleration a shock =90 g in the case of vibration. To increase the shock resistance, the holding force for holding the actuator in the open position may be increased, for example by increasing the spring rate to push the actuator into the open position. For example, an actuator having a mass m a is subjected to an impact force F shock = ma* ashock. Further, the actuator may be limited in view of weight and installation space requirements. Disclosure of Invention It is an object of the present invention to provide a solution for an actuator that is improved in terms of the parameters of the rod movement distance, the resistance, the weight and the installation space. At the same time, modifications should not significantly affect characteristics such as high precision and control, fast response time, high efficiency in converting electrical energy to mechanical energy, smooth and continuous motion, low maintenance, quiet operation, and high force density. This object is solved by the independent claims. The dependent claims address advantageous embodiments. According to a general aspect, the actuator further comprises a shock absorbing core disposed between the fixed core and the rod moving core in the coil, as described above in connection with fig. 17. The damper core and the rod moving core are used to at least partially form the armature. The damper core is movable between a stop position and a release position that are spaced apart in the axial direction by a damper distance. The damper core receives a holding force holding the damper core. The holding force is used to prevent the rod moving core from moving in the closed position when the coil is not energized, or to hold the shock absorbing cores together with a predetermined force. This arrangement of the armature comprising two separate cores helps to increase the impact resistance. For exampl