Three phase, pole-changing rotary electric machines

Claim 1

A ROTARY ELECTRIC MACHINE HAVING A THREE-PHASE WINDING PROVIDING A FIRST POLE-NUMBER OF P POLE-PAIRS AND A SECOND POLE-NUMBER SELECTED FROM THE POLE-NUMBERS (P+M) AND (P-M) POLE-PAIRS, WHERE M IS THE NUMBER OF CYCLES OF A MODULATION WAVE AROUND THE CIRCUMFERENCE OF THE WINDING AND, HAVING THREE PHASE-WINDINGS SEQUENTIALLY ARRANGED AROUND AN AXIS, THE ELECTRICAL PHASESEQUENCE A, B, C AND PHASE-BAND SEQUENCE +A -C +B -A +C -B DEFINING A REFERENCE SENSE OF ROTATION AROUND SAID AXIS, SAID PHASE-WINDING COMPRISING COILS CONNECTED TOGETHER IN EACH PHASE-WINDING TO PROVIDE 2P POLES, SWITCH MEANS FOR CONNECTING SELECTED ONES OF SAID COILS IN AN ALTERNATIVE MANNER TO MODULATE THE RELATIVE AMPLITUDES OF SAID 2P POLES ACCORDING TO THREE POLE-AMPLITUDE MODULATION WAVES APPLIED ONE TO EACH PHASE-WINDING IN SPACED RELATIONSHIP, EACH POLE-AMPLITUDE MODULATION WAVE COMPRISING M CYCLES OF ALTERNATE POSITIVE AND NEGATIVE PARTS BEIND INDENTIFIED 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 POINTS SPACED APART SUBSTANTIALLY ONE-THIRD OF A REVOLUTION AROUND SAID AXIS, THE SEQUENCE OF SAID POLEAMPLITUDE MODULATION WAVES AT SAID THREE SPACED POINTS BEING IN THE PHASE-SEQUENCE A, B, C IN THE SAID REFERENCE SENSE OF ROTATION WHEN SAID SECOND POLE-NUMBER IS (P+M) POLE-PAIRS AND BEING IN THE PHASE SEQUENCE A, C, B WHEN SAID SECOND POLE-NUMBER IS (P-M) POLE-PAIRS, WHEREIN ONE OF SAID FIRST AND SECOND POLE-NUMBERS IS A NUMBER DIVISIBLE BY THREE, WHEREIN AND THE SAID THREE-PHASE WINDING IS AN INTEGRAL-SLOT WINDING AND WHEREIN THE POLE-AMPLITUDE OF THE POLE AT AT LEAST ONE END OF EACH HALF OF EACH PHASEWINDING IS REDUCED IN THE ALTERNATIVE, THAT IS TO SAY MODULATED, CONNECTING, SAID POLE-AMPLITUDE REDUCTION BEING EFFECTED BY REVERSAL IN CURRENT-CARRYING SENSE OF SELECTED COILS RELATIVELY TO ALL THE REMAINING COILS OF THE COIL-GROUPS PROVIDING SAID POLES OF REDUCES AMPLITUDE, WHEREBY ALL THE COILS OF ALL PHASE-BANDS ARE INCLUDED IN CIRCUIT FOR BOTH THE FIRST AND THE ALTERNATIVE CONNECTIONS.