LINEAR ACTUATOR

摘要

A linear actuator, wherein a permanent magnet is reliably prevented from being damaged.  In a first linear actuator, the width of a radial gap between a first contact section and a second contact section or the width of a circumferential gap between the first contact section and the second contact section is less than the width of a gap between a permanent magnet and a magnetic pole section.  In a second linear actuator, a flat plate-like permanent magnet is provided to one of a movable section or a fixed section to which a coil for generating a magnetic flux for reciprocating the movable section is provided, and among portions of the other, a portion facing the permanent magnet and functioning as a magnetic pole surface is formed flat.  In a third linear actuator, each of an engaging projection and a cutout is provided so as to be oriented in the direction in which the magnetic force of the permanent magnet acts on the magnetic pole section.  At least a portion of the cutout is cut out toward the direction in which the magnetic force of the permanent magnet acts on the magnetic pole section.