Patent ID: 8810097

Claim:
A magnetic gear arrangement comprising: a first gear member for generating a first magnetic field, a second gear member for generating a second magnetic field, and a plurality of interpoles disposed between the first gear member and the second gear member for coupling said first magnetic field and said second magnetic field to control a gear ratio between said first gear member and said second gear member, wherein at least one interpole comprises wiring and a switch to activate said wiring, such that activation of said wiring alters the magnetic flux at said interpole so as to vary the coupling between said first magnetic field and said second magnetic field, said wiring is electrically connected to an electronic filter, which modifies the current passing through said wiring, so as to modify the influence of said wiring on the magnetic flux at said interpole, said electronic filter is a variable filter, and the magnetic gear arrangement further comprises a control system for controlling the operation of the electronic filter, the control system comprising at least one magnetic field sensor to monitor the magnetic field in the magnetic gear arrangement, and the control system is configured to provide feedback from the at least one magnetic field sensor to the electronic filter.