| 摘要 |
<p>A magnetic gear comprises a first movable member (12) comprising a first set of magnetic elements (14) forming ph magnetic pole pairs; and a second movable member (16) comprising a number ns of pole pieces (18) in said air gap. A control member (20) comprises a second set of magnetic elements (22i) adapted to form pl magnetic poles pairs, the control member comprising at least a predetermined number of controllable magnetic elements (22 2 ) having selectable polarity. A controller (30) is configured to allow changing, in use, the polarity of the magnetic elements (22 2 ) of selectable polarity to modify the number of magnetic poles pairs on the control member (20) in such a way that the magnetic gear operates under one of the following conditions: ns=pl+ph or ns=ph-pl or ns=pl-ph.</p> |
