Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
May 17, 2011
Patent Application Number
12493711
Date Filed
June 29, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
A synchronous permanent magnet machine for at least two rotation speeds has a single stator and at least two rotors. For each rotation speed there is provided a separate rotor with a different numbers of poles. The armature windings on the stator extend across all of the rotors and the windings are subjected to a rotating field with the same frequency.
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