Electromagnetic brakes and clutches

Claim 1

AN ELECTROMAGNETIC DEVICE SUITED FOR A SYSTEM INCLUDING MOTOR MEANS AND A LOAD ELEMENT POSITIONED THEREBY COMPRISING AT LEAST ONE PAIR OF RELATIVELY ROTATABLE MAGNETIC STRUCTURES, EACH HAVING SPACED POLE TEETH SEPARATED BY AN AIR GAP FROM POLE TEETH OF THE OTHER STRUCTURE, MEANS FOR MECHANICALLY COUPLING ONE OF SAID STRUCTURES TO THE MOTOR MEANS FOR ROTATION RELATIVE TO THE OTHER OF SAID STRUCTURES, MEANS FOR PRODUCING A MAGNETIC FIELD LINKING SAID RELATIVELY ROTATABLE STRUCTURES BY MAGNETIC FLUX TRANSVERSING SAID AIR GAP BETWEEN THE POLE TEETH OF SAID STRUCTURES TO PROVIDE A NON-FRICTIONAL STATIC-BRAKING TORQUE ALTERNATELY RESISTING AND ASSISTING RELATIVE ROTATION OF SAID STRUCTURES FROM ONE TO THE NEXT POSITION OF ALIGNMENT OF THEIR POLE TEETH FOR MINIMUM AIR-GAP RELUCTANCE, COIL MEANS ENERGIZABLE TO BUCK OUT SAID MAGNETIC FIELD TO PERMIT RELATIVE ROTATION OF SAID STRUCTURES, AND NON-MAGNETIC CONDUCTIVE MEANS DISPOSED ON ONE OF SAID STRUCTURES AND PROVIDING A WINDING FOR COOPERATION WITH SAID MAGNETIC FIELD WHEN SAID COIL MEANS IS DEENERGIZED TO PROVIDE A NON-FRICTIONAL DYNAMICBRAKING TORQUE REDUCING THE RELATIVE SPEED OF SAID STRUCTURES DURING THEIR RELATIVE ROTATION.