Importance

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Abstract

A cylindrically-symmetrical moving coil linear actuator utilizes axially-magnetized cylindrical magnets to provide flux-focused interleaved magnetic circuits. The moving coil linear actuator includes a cylindrical shell that has a closed end and open end. A magnetic core is disposed within the shell to define an annular air gap between the shell and the core. The core includes a first set of axially-magnetized cylindrical permanent magnets having a first direction of magnetization and disposed in proximity to the closed end of the shell. A second set of axially-magnetized cylindrically permanent magnets has a second direction of magnetization which is opposite of the first direction of magnetization and is disposed in proximity to the open end of the shell. A first ferro-magnetic pole piece is disposed between the first set of magnets and the second set of magnets. A second ferro-magnetic pole piece is disposed between the second set of magnets and the open end of the shell. A moving coil assembly is disposed within the annular air gap. The coil assembly includes a non-magnetic coil carrier disposed within the air gap. A first coil winding is formed on the coil carrier in proximity to the first set of magnets and is wound to have a first polarity. A second coil winding is formed on the coil carrier in proximity to the second set of magnets and is wound to have a second polarity opposite to the first polarity such that the first and second coil windings are wound in series opposition.

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First Claim