Modulator for variable speed motor

Claim 1

IN COMBINATION: A MOTOR HAVING AT LEAST TWO WINDINGS HAVING SPACED AXES; A SWITCH FOR EACH WINDING FOR CONNECTING THE CORRESPONDING WINDING TO A SOURCE OF ALTERNATING CURRENT; MEANS FOR PRODUCING MULTIPHASE CYCLIC PILOT SIGNALS CORRESPONDING TO THE NUMBER OF MOTOR WINDINGS AND HAVING A FIXED RELATIVE FREQUENCY RELATIONSHIP; SAID PILOT SIGNALS HAVING A DEGREE OF SYMMETRY RELATIVE TO THEIR AXES TO DEFINE SUCCESSIVE HALF CYCLES OF THE CORRESPONDING PHASES; AND A MODULATOR FOR EACH SWITCH AND COOPERABLE WITH THE RESPECTIVE PILOT SIGNAL PRODUCING MEANS, EACH COMPRISING FIRST CIRCUIT MEANS OPERATIVE DURING PERIODS CORRESPONDING TO FIRST HALVES OF THE CORRESPONDING PILOT SIGNAL CYCLE AND FIRST HALVES OF THE SOURCE CYCLE FOR OPERATING THE CORRESPONDING SWITCHING MEANS THROUGHOUT A PHASE ANGLE OF THE SOURCE CYCLE CORRESPONDING SUBSTANTIALLY TO THE INSTANTANEOUS AMPLITUDE OF THE PILOT SIGNAL, AND SECOND CIRCUIT MEANS OPERATIVE DURING PERIODS CORRESPONDING TO SECOND HALVES OF THE PILOT SIGNAL CYCLE AND FIRST HALVES OF THE SOURCE CYCLE FOR OPERATING THE CORRE-