Abstract: Disclosed is a linear actuator which includes a core, a coil, a magnet assembly, and a housing. The coil that is shaped to be positioned about the core for movement along a longitudinal axis of the core. The housing is supported by core flanges and positioned about the coil and the core. The magnet assembly includes magnets of the same polarity facing the coil and shaped to be positioned inside or outside of the coil, and supported by the core or by the housing, respectively. The core includes first and second portions, each having an end face, and the first and second portions are positioned along the longitudinal axis so that the end faces oppose each other and are separated by a gap. A cavity is formed in each of the end faces along the longitudinal axis.

Abstract: Disclosed is a linear coil actuator having field sub-assemblies, and a coil assembly, in which the field sub-assemblies each have a field blank, and at least one of the field sub-assemblies also includes groups of magnets. Each group of magnets employs magnets having the same or different sizes and arranged to provide a magnetic polarity and a magnetic flux density distribution in the air gap in correspondence to specified load characteristics, such as a spring having a spring constant K. The field sub-assemblies are positioned with respect to one another to form a gap between the field assembly which includes the magnets, and another of the field assemblies, and the coil assembly is moveable in the gap.