Variable-reluctance electric machines

Claim 1

A VARIABLE-RELUCTANCE ELECTRICAL MACHINE COMPRISING A STATOR LONGITUDINALLY DIVIDED INTO A FIRST PART AND A SECOND PART, AT LEAST TWO PAIRS OF POLES RESPECTIVELY ON EACH PART OF SAID STATOR, SAID POLES HAVING AN EQUAL ANGULAR EXTENT AS MEASURED AROUND THE ROTOR AXIS AND EACH POLE BEING PROVIDED WITH A MAGNETIZING WINDING ONE TERMINAL OF WHICH IS CONNECTED TO THE WINDING OF THE POLE OF THE SAME PAIR AND THE OTHER TERMINAL OF WHICH IS CONNECTED TO THE WINDING OF A POLE OF THE OTHER OF SAID STATOR PARTS, A ROTOR AXIALLY DIVIDED INTO A FIRST HALF-ROTOR AND A SECOND HALF-ROTOR, BOTH OF SAID HALF-ROTORS BEING INTEGRAL WITH EACH OTHER, AND AT LEAST TWO PAIRS OF MAGNETIC TEETH WHICH PROJECT RESPECTIVELY FROM SAID FIRST AND SECOND HALFROTORS IN CLOSE PROXIMITY WITH THE POLES OF THE FIRST AND SECOND PARTS OF SAID STATOR TO COACT WITH THE FIELD CREATED BY SAID WINDINGS, EACH OF SAID HALF-ROTORS HAVING A NUMBER OF PAIRS OF TEETH EQUAL TO THE NUMBER OF PAIRS OF POLES OF EACH OF SAID STATOR PARTS AND EACH TOOTH HAVING AN ANGULAR EXTENT SUBSTANTIALLY EQUAL TO THE ANGULAR EXTENT OF SAID POLES, THE SUM OF THE ANGULAR EXTENT OF THE PORTION OF A FIRST HALF-ROTOR TOOTH UNDER A GIVEN POLE AND OF THE PORTION OF A SECOND HALF-ROTOR TOOTH UNDER A POLE THE WINDING OF WHICH IS CONNECTED TO ONE TERMINAL OF THE WINDING OF SAID GIVEN POLE BEING SUBSTANTIALLY EQUAL TO THE ANGULAR EXTENT OF A POLE, THE AVERAGE DENSITY OF MAGNETIC MATERIAL INCLUDED IN A HALF-ROTOR TOOTH DECREASING FROM THE CENTRAL AXIS OF THE TOOTH ON BOTH SIDES OF THE LAST SAID AXIS, EACH OF SAID HALF-ROTOR COMPRISING A STACK OF A FIRST PLURALITY AND A SECOND PLURALITY OF STRIPS OF MAGNETIC MATERIAL IN A PLANE NORMAL TO THE ROTOR AXIS, EACH STRIP OF SAID FIRST PLURALITY BEING SHAPED TO PROVIDE SUBSTANTIALLY RECTANGULAR PROJECTING PORTIONS HAVING AN ANGULAR EXTENT LESS THAN THE ANGULAR EXTENT OF SAID POLE AND GREATER THAN HALF OF THE SAME AND EACH STRIP OF SAID SECOND PLURALITY BEING CIRCULAR AND UTILIZED AS A SPACER BETWEEN GROUPS OF STRIPS OF SAID FIRST PLURALITY, AND WHEREIN EACH TOOTH IS FORMED BY THE COMBINATION OF AT LEAST ONE GROUP OF SAID PROJECTING PORTIONS BEING ANGULARLY DISPLACED IN A FAN-LIKE ASSEMBLY SO AS TO TAKE UP TOGETHER AN ANGULAR EXTENT SUBSTANTIALLY EQUAL TO THE ANGULAR EXTENT OF SAID POLES AND TO PROVIDE THE AVERAGE MAGNETIC MATERIAL DENSITY PER VOLUME UNIT OF THE TOOTH DECREASING FROM ABOUT 80% NEAR THE CENTRAL AXIS OF THE TOOTH TO ABOUT 20% AT BOTH LATERAL PARTS OF THE SAME.