Rotary electric machine providing pole-changing by pole-amplitude modulation

Claim 1

A POLE-CHANGING ROTARY ELECTRIC MACHINE HAVING A THREE-PHASE WINDING PROVIDING A FIRST POLE-NUMBER OF P POLE-PAIRS AND A SEDCOND POLE-NUMBER SELECTED FROM THE POLE-NUMBERS (P+M) POLE-PAIRS AND (P-M) POLE-PAIRS, WHERE M IS THE NUMBER OF CYCLES OF A MODULATION WAVE AROUND THE WINDING CIRCUMFERENCE, ONE OF SAID FIRST AND SECOND POLE-NUMBERS BEING AN EVEN MULTIPLE OF THREE, THE SAID WINDING COMPRISING THREE PHASE-WINDING SEQUENTIALLY ARRANGED AROUND AND AXIS, THE ELECTRICAL PHASE-SEQUENCE A, B, C AND PHASE-BAND SEQUENCE +A -C+DB -A +C -B DEFINING A REFERENCE SENSE OF ROTATION AROUND SAID AXIS, SAID PHASE-BANDS COMPRISING COILS CONNECTED TOGETHER TO PROVIDE P POLE-PAIRS OF A FIRST, THAT IS TO SAY UNMODULATED, MANNER OF CONNECTION, SWITCH MEANS FOR CONNECTING SELECTED COILS IN A ALTERNATIVE, THAT IS TO SAY UNMODULATED, MANNER OF CONNECTION TO MODULATE THE RELATIVE AMPLITUDES OF SAID P POLE-PAIRS ACCORDING TO THREE POLE-AMPLITUDE MODULATION WAVES APPLIED ONE TO EACH OT THE THREE PHASE-WINDINGS IN SPACED RELATIONSHIP, EACH POLE-AMPLITUDE MODULATION WAVE COMPRISING M CYCLES OF ALTERNATRE POSITIVE AND NEGATIVE PARTS FOLLOWING SEQUENTIALLY FROM AN ORIGIN, SAID POSITIVE AND NEGATIVE PARTS BEING IDENTIFIED BY REVERSAL OF POLARITY OF THE POLES OF SAID NEGATIVE PART RELATIVE TO THE POLES OF SAID POSITIVE PART, THE SPACED RELATIONSHIP OF SAID POLE-AMPLITUDE MODULATION WAVES BEING SUCH AS TO SPACE THE ORIGINS THEREOF AT THREE ORIGINAL POINTS SPACED APART SUBSTANTIALLY ONE-THIRD OF A REVOLUTION AROUND SAID AXIS, THE SEQUENCE OF THE POLE-AMPLITUDE MODULATION WAVES AT SAID THREE ORIGINAL POINTS BEING IN THE PHASE SEQUENCE A, B, C, IN THE SAID REFERENCE SENSE OF ROTA-