Three phase, pole-changing rotary electric machine

Claim 1

A POLE-CHANGING 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) POLE-PAIRS, WHERE M IS THE NU-MBER OF CYCLES OF A MODULATION WAVE AROUND THE WINDING CIRCUMFERENCE, HAVING THREE PHASE-WINDINGS SEQUENTIALLY ARRANGED AROUND AND 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-BANDS 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 RELATION, EACH POLE-AMPLITUDE MODULATION WAVE COMPRISING M CYCLES OF ALTERNATE POSITIVE AND NEGATIVE PORTS FOLLOWING SEQUENTIALLY FROM AN ORIGIN, SAID POSITIVE AND NEGATIVE PARTS BEIND 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 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 NEITHER SAID FIRST POLE-NUMBER NOR SAID SECOND POLE-NUMBER IS A NUMBER DIVISIBLE BY THREE, WHEREIN 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 PHASE-WINDING IS REDUCED IN THE ALTERNATIVE, THAT IS TO SAY MODULATED, CONNECTION, SAID POLEAMPLITUDE REDUCTION BEING EFFECTED BY REVERSAL IN CURRENTCARRYING SENSE OF SELECTED COILS RELATIVELY TO ALL THE REMAINING COILS OF THE COIL-GROUPS PROVIDING SAID POLES OF REDUCED AMPLITUDE, WHEREBY ALL COILS OF ALL PHASE-BANDS ARE INCLINED IN CIRCUIT FOR BOTY THE FIRST AND THE ALTERNATIVE CONNECTIONS.