Variable speed induction motors including photoelectric position sensing

Claim 1

A VARIABLE SPEED INDUCTION MOTOR COMPRISING: (A) A BASE, A COIL, A SUPPORT FOR SAID COIL MOUNTED ON SAID BASE AND SAID COIL MOUNTED THEREON, A ROTOR ROTATABLE ABOUT A FIRST AXIS, BEARINGS FOR SAID ROTOR, AT LEAST ONE OF WHICH BEARINGS IS SUPPORTED ON SAID BASE, A SHAFT ATTACHED TO SAID ROTOR, AND A CYLINDRICAL BEARING WHEEL SUPPORTED ON SAID SHAFT EXTERIOR TO SAID ROTOR; THE CYLINDRICAL AXIS OF SAID CYLINDER COAXIAL WITH THE CENTER OF SAID SHAFT; (B) A CIRCULAR DISC ROTATABLE ABOUT AN AXIS, THE EDGE OF SAID DISC CONTACTING THE EDGE OF SAID BEARING WHEEL AND IN DRIVING RELATIONSHIP THERETO, AN OPAQUE AND A TRANSPARENT PORTION ON AT LEAST ONE SURFACE OF SAID DISC; (C) A LUMINOUS EMISSION SOURCE, A COLLIMATOR SURROUNDING SAID LUMINOUS EMISSION SOURCE, AND A SUPPORT THEREFOR; A PHOTOSENSITIVE ELECTRIC MEANS AND A SUPPORT THEREFOR, A COLLIMATOR FOR SAID PHOTOSENSITIVE ELECTRICAL MEANS, SAID COLLIMATORS HAVING A COMMON OPTICAL AXIS;