Discontinuous Thrust Actuator and Stirling Engine

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This invention describes a thrust actuator mechanism that uses magnetic forces to transform continuous rotational motion into abrupt, discontinuous linear thrusts. At its core, the device relies on the periodic switching of magnetic polarity to generate a sudden push or pull on a moving magnet (the rotor magnet), creating bursts of thrust. The design is particularly suited to driving components of a Stirling engine, such as flexible membranes, in a way that optimizes engine efficiency and minimizes wear and tear due to the lack of mechanical contact between elements.

Use CasesContent extracted from patent full text and abstract with AI.

• Improving mechanical efficiency and lifespan in Stirling engines by reducing friction and wear in the actuator mechanism.
• Providing precise, discontinuous actuation for industrial machines that require periodic application of force (e.g., in textile machinery, pumps, or electric hammers).
• Enhancing energy conversion systems where abrupt, high-force movements are desirable but traditional mechanical setups are prone to failure or excessive maintenance.
• Precision actuation of membranes or pistons in scientific instruments or sensors where long-term reliability is important.
• Applications in hand-held power tools (like electric hammers or hedge trimmers) where sudden impetus is functionally advantageous and safety is improved by reducing possible kickback risks.

BenefitsContent extracted from patent full text and abstract with AI.

• Minimized mechanical wear and maintenance due to contactless (magnetic) operation, increasing device longevity.
• Reduced noise compared to traditional actuators that rely on mechanical impact or gear systems.
• Enhanced efficiency in Stirling engines by better control of the compression/expansion phases, leading to greater power output.
• Improved safety since forces are inherently limited by magnetic field strengths, lowering the risk of sudden, uncontrolled movements or blockages.
• Compact and simple design allows for easier assembly and potential cost savings in manufacturing.
• Greater precision and control over discontinuous actuation, enabling more adaptable machine and engine designs.

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Patent Abstract

The invention relates to a thrust actuator for converting a continuous, that is, cyclically recurring, rotational movement to a discontinuous thrust movement of a permanent-magnet rotor magnet, and to a Stirling engine which particularly benefits therefrom. According to the invention, the rotor magnet is movably mounted such that it can be displaced toward a drive magnet, wherein the polarity of the drive magnet relative to the rotor magnet can be varied by the rotational movement. The rotor magnet can be connected in particular to a rotor which participates in the thrust movement of the rotor magnet. It was recognized that the continuous rotational movement modulates the magnetic interaction between the rotor magnet and the drive magnet periodically between attraction and repulsion in said arrangement. The rotor magnet can thus be moved periodically but abruptly away from and back toward the drive magnet. A discontinuous, periodic thrust movement of the rotor magnet and of a rotor that may be coupled thereto can thus be achieved. The invention further relates to a Stirling engine as a primary application for the thrust actuator.