Linear Actuator Thrust Force and Resonance Control

The patent employs nested configuration where the coil is wound around a coil bobbin, the permanent magnet is positioned inside the coil, and the first core and second core are stacked in the axial direction with the permanent magnet between them. This nesting arrangement maximizes the magnetic circuit efficiency and thrust force generation while maintaining a compact structure, resolving the contradiction between structural simplicity and thrust force magnitude.

The patent merges multiple magnetic elements into a single integrated permanent magnet assembly positioned between the first core and second core. Instead of using multiple separate permanent magnets that would increase part count, the design combines the magnetic function into one unified component that works with the stacked core structure to generate sufficient thrust force, thereby reducing the number of constituent parts while maintaining force output.

The patent extracts and eliminates the supporting shaft from the system by implementing a magnetic bearingless drive mechanism. The movable element is supported through magnetic forces and mechanical constraints provided by the core structures and coil bobbin, rather than requiring a physical supporting shaft to pass through the movable element. This extraction of the supporting shaft reduces the number of constituent parts while maintaining reliable support for the movable element.

The patent changes the manufacturing parameter of the end plate part from being formed by a drawing process (which limits thickness) to being formed by a stacking process where multiple magnetic plates are stacked in the axial direction. This parameter change in the manufacturing method allows the end plate part to achieve sufficient thickness while maintaining ease of manufacture through standard stacking and bonding processes.