| 摘要 |
<p>A motor roller (1) for transferring articles or materials comprising a hollow cylindrical drum (2) of a material of high magnetic permeability, rotably supported on a structure and a driving motor housed inside the drum (2), has a substantially cylindrical tubular sintered body (3) of a material permanently magnetized per longitudinal stripes defining a plurality of magnetic poles of alternate sign uniformly arranged around the circumference of the tubular body (3) installed inside the drum (2) of material of high magnetic permeability and mechanically connected to it with minimum gap between the outer surface of said permanently magnetized tubular body (3) and the inner surface of the drum (2). The cylindrical surface of the drum (2) has thickness sufficient to provide for the closing of the plurality of magnetic flux circuits between poles of opposites sign defined one adjacent to the other in the tubular body (3) permanently magnetized per longitudinal stripes without reaching saturation conditions. An axle-stator (4) is held on an axle (5) and is fixed to said supporting structure and by means of at least a bearing mounted on said axle rotably sustains the hollow drum. A driving system of phase windings of said axle-stator (4) in synchronism with the angular position of the outer rotor constituted by said drum (2) and by the stripwise permanently magnethized tubular body (3) actuates the closed loop regulation of the rotating speed of the motor in a certain motion direction of rotation.</p> |
