Axial airgap electric rotary machines

Claim 1

AN AXIAL AIRGAP ELECTRIC ROTARY MACHINE COMPRISING A DISC-SHAPED PRINTED-CIRCUIT WINDING MADE OF CONDUCTORS INTIMATELY ADHERING ON ONE FACE AT LEAST OF AN INSULATING ANNULAR CARRIER ON THE AIRGAP FACE THEREOF, SAID WINDING HAVING AN ACTIVE PART FORMED OF SUBSTANTIALLY RADIAL CONDUCTOR PORTIONS COOPERATING WITH AT LEAST ONE MAGNETIC POLE RING, SAID POLE RING BEING FORMED OF COERCIVE MAGNETIC MATERIAL PERMANENTLY MAGNETIZED TO PRESENT MAGNETIC POLES OF OPPOSITE POLARITIES IN ALTERNATE AREAS OF THE AIR-GAP FACE OF SAID RING, SAID POLE RING HAVING A RADIAL HEIGHT GREATER THAN THAT OF THE ACTIVE PART OF THE WINDING, AND MAGNETIC POLAR PIECES OF MAGNETICALLY SOFT MATERIAL MOUNTED ON THE MAGNETIZED AREAS OF SAID POLE RING, THE FACES OF SAID POLES PIECES WHICH ENGAGE SAID RING HAVING A RADIAL HEIGHT SUBSTANTIALLY EQUAL TO THAT OF THE PERMANENT MAGNET RING, AND SAID POLAR PIECES HAVING AIRGAP FACES ADJACENT SAID WINDING OF A RADIAL HEIGHT SUBSTANTIALLY EQUAL TO THE RADIAL HEIGHT OF THE ACTIVE PART OF SAID WINDING.