Magnomatics Limited

Petr Chmelicek

David James Powell

Stuart David Calverley

An electrical machine comprising: a first rotor, the first rotor producing a first magnetic field having a first number of pole pairs; a second rotor comprising a plurality of pole pieces, the plurality of pole pieces being arranged to modulate the first magnetic field to produce a second magnetic field having a second number of pole pairs; a stator Comprising one or more windings arranged to produce a third magnetic field arranged to interact with the first number of pole pairs and the second number of pole pairs; wherein the interaction of the third magnetic field with the first number of pole pairs and the second number of pole pairs changes a torque ratio between the first rotor and the second rotor.

Electrical machine and a method of operating an electrical machine

A magnetically geared apparatus (), a pole piece component () and a plurality of pole pieces () for such apparatus are disclosed. The magnetically geared apparatus () comprises the pole piece component () and the pole piece component () comprises the plurality of pole pieces () mounted to a carrier (), wherein at least one of the pole pieces () comprises at least two axially-spaced portions spaced apart by a portion of a higher magnetic reluctance () than that of each of the two axially-spaced portions.

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Sheffield, United Kingdom

Petr Chmelicek