Electro-magnetic drive unit comprising a pivotable armature

摘要

An electromagnetic drive unit comprises a stator (2) and an armature (4) which is pivotable about a pivotal axis (5) and which cooperates with the stator via an air gap. In order to minimize the volume and to obtain a maximum efficiency, the armature is arranged coaxially around the stator, the stator comprising at least two polepieces (6A) which are interconnected by a stator member (6B) carrying a coil (8). The armature comprises a plurality of radially magnetized poles (28A, 28B) which correspond in number to at least the number of polepieces, which poles are tangentially juxtaposed with alternately opposite polarities.