Rotating, single-phase electromagnetic actuator

摘要

A constant-torque single-phase electromagnetic actuator comprising a stationary device consisting of a first magnetic stator circuit made of a high-permeability material and excited by at least one field coil (10), and a movable device (1) consisting of an axially magnetized disc (3) having 2N pairs of magnetic poles magnetized in alternate directions, wherein the magnetization is substantially uniform. Said magnetized disc (3) is attached to a second magnetic circuit (6) made of a high-permeability material, and said movable device is provided with a coupling shaft (7). The connection between the stationary device (1) and the movable device (2) allows at least axial play of the coupling shaft (7) away from the stationary stator device (2), and the diameter of the magnetized disc (3) is substantially identical to that of the poles of the stator circuits. Play between the stationary (2) and movable (1) devices is compensated by the magnetic attraction exerted by the stationary device on the movable one.