Brushless rotary inverter

Claim 1

A ROTARY MACHINE COMPRISING (A) A GENERALLY CYLINDRICAL CASING OF MAGNETIC MATERIAL HAVING OPPOSITE ED PLATES OF MAGNETIC MATERIAL AND HAVING A CENTRAL RADIALLY EXTENDING PARTITION FLANGE OF MAGNETIC MATERIAL, SAID END PLATES AND SAID CENTRAL PARTITION FLANGE TERMINATING IN END PLATE RADIALLY INWARDLY DIRECTED ANNULAR POLAR FACES AND A CENTRAL PARTITION RADIALLY INWARDLY DIRECTED ANNULAR POLAR FACE, RESPECTIVELY (B) A ROTOR ASSEMBLY MOUNTED FOR ROTATION WITHIN SAID CASING AND COMPRISING OUTER ROTOR ELEMENTS OF MAGNETIC MATERIAL HAVING CYLINDRICAL RADIALLY OUTWARDLY DIRECTED FACES DISPOSED IN CLOSELY SPACED CONFRONTING RELATION TO THE RESPECTIVE END PLATE POLAR FACES AND AN INTERMEDIATE ROTOR ELEMENT OF MAGNETIC MATERIAL HAVING A CYLINDRICAL RADIALLY OUTWARDLY DIRECTED FACE IN CLOSELY SPACED CONFRONTING RELATION TO THE CENTRAL PARTITION ANNULAR POLAR FACE, SAID OUTER ROTOR ELEMENTS HAVING AXIALLY EXTENDING POLE FACE, SAID OUTER ROTOR SAID INTERMEDIATE ROTOR ELEMENT HAVING INTEGRAL POLE PORTIONS EXTENDING AXIALLY THEREFROM IN OPPOSITE DIRECTIONS AND INTERDIGITATED WITH THE POLE PORTIONS OF THEO UTER ROTOR ELEMENTS TO PROVIDE RESPECTIVE FIRST AND SECOND SERIES OF ROTOR POLES, (C) MEANS SECURING SAID OUTER AND INTERMEDIATE ROTOR ELEMENTS TOGETHER AS A UNIT FOR JOINT ROTATION, (D) FIRST AND SECOND EXCITATION MEANS ADJACENT SAID CASING BETWEEN THE RESPECTIVE END PLATES AND THE CENTRAL PARTITION FLANGE FOR PRODUCING EXCITING MAGNETIC FLUXES EXTENDING AXIALLY IN THE CASING, RADIALLY INWARDLY IN THE END PLATES TO THE ROTOR ELEMENT CYLINDRICAL FACES, EXTENDING FROM THE OUTER ROTOR ELEMENT POLE PORTIONS TO THE RESPECTIVE INTERDIGITATED INTERMEDIATE ROTOR ELEMENT POLE PORTIONS AND FROM THE INTERMEDIATE ROTOR ELEMENT CYLINDRICAL FACE TO THE CENTRAL PARTITION FLANGE, SAID (E) FIRST AND SECOND STATOR MEAN RADIALLY INWARDLY OF THE FIRST AND SECOND EXCITION MEANS RESPECTIVELY AND HAVING FIRST AND SECOND SERIES OF CIRCUMFERENTIALLY SPACED POLES RESPECTIVELY COOPERATING WITH THE FIRST AND SECOND SERIES OF ROTOR POLES OF THE ROTOR ASSEMBLY,