Patent ID: 6833639
Filing Date: 2004-12-21
Classification: A61C,H02K

Abstract:
An electric actuator for providing an angular reciprocating drive, comprising:a casing; a stator housed in the casing; and an armature extending co-axially through the stator; the stator having an annular arrangement of poles and a coil for energization by an alternating current to magnetise the poles in opposite polarities as between adjacent poles; the armature having a shaft supported by the casing for angular movement and a plurality of permanent magnets mounted fast on and around the shaft, wherein each magnet has opposite ends and extends substantially parallel to the shaft, and the magnets are secured on the shaft by a pair of mounting members surrounding respective opposite ends of the magnets; the magnets having proximal sides as between adjacent magnets of opposite polarities, wherein upon repeated reversals of said alternating current the magnets interact magnetically with the poles to cause the shaft to oscillate thereby providing said drive.