MOVING MAGNET TYPE LINEAR ACTUATOR

摘要

There is provided a moving magnet type linear actuator having a long service life in which a linear guide is not affected even when a highly-frequent acceleration/deceleration operation is performed. The moving magnet type linear actuator (10) includes: a stator unit (30) having a stator base (31), a magnetic core (33), and an armature unit (32); and a movable unit (20) having a field permanent magnet (21) arranged to face the magnetic core (33) via a magnetic first gap (ga) and a magnet holder (22) made of a non-magnetic substance, supporting the field permanent magnet (21), and movably arranged on the stator base (31). A magnetic back yoke (39) is arranged via a magnetic second gap (gb) from the field permanent magnet (21) at the anti-armature side of the field permanent magnet (21). The magnetic second gap (gb) is set longer than the magnetic first gap (ga).