Electromagnetic coupling apparatus

Claim 1

IN ELECTROMAGNETIC COUPLING APPARATUS OF THE KIND HAVING MAGNETIC CIRCUIT MEANS INCLUDING AN ANNULAR SERIES OF ROTATABLE POLE MEMBERS COMPRISING GROUPS OF INTERDIGITATED POLE MEMBERS, AND ROTATABLE ANNULAR INDUCATOR MEANS IN A CO-OPERATIVE AIR-GAP RELATION TO SAID POLE MEMBERS; ROTATABLE POWER INPUT AND POWER OUTPUT SAHFT MEMBERS HAVING A COMMON ROTATION AXIS; ONE OF SAID SHAFT MEMBERS HAVING SAID POLE MEMBERS CONNECTED THEREWITH AND DISTRIBUTED THEREAROUND, AND THE OTHER SHAFT MEMBER HAVING SAID INDUCTOR MEANS CONNECTED THEREWITH; AND FIELD MEANS COMPRISING A STATIONARY FIELD MEMBER IN THE MAGNETIC CIRCUIT OF SAID CIRCUIT MEANS, AND ANNULAR COIL MEANS ON SAID FIELD MEMBER AND ENERGIZABLE TO CAUSE FLUX TO TRAVERSE SAID MAGNETIC CIRCUIT; SAID MAGNETIC CIRCUIT MEANS ALSO COMPRISING A ROTATABLE FIRST ANNULAR POLE RING MEANS CONNECTED WITH ONE GROUP OF SAID POLE MEMBERS AND EXTENDING IN AN AXIAL DIRECTION AWAY FROM SAID ANNULAR SERIES; SAID FIELD MEMEBR COMPRISING A SECOND ANNULAR POLE RING MEANS LOCATED RADIALLY OUTWARD OF SAID COIL MEANS AND SAID FIRST POLE RING MEANS AND EXTENDING AT LEAST PART WAY ACROSS SAID COIL MEANS AND IN A SURROUNDING RELATION TO SAID FIRST POLE RING MEANS AND IN AN AXIAL DIRECTION TOWARD SAID ANNULAR SERIES; SAID FIRST AND SECOND ANNULAR POLE RING MEANS HAVING ANNULARLY COEXTENSIVE ADJACENT END PORTIONS IN AN OPPOSED CO-OPERATIE AIR-GAP RELATION IN SAID MAGNETIC CIRCUIT.