Electric motor for limited rotation

Claim 1

A MOTOR COMPRISING, IN COMBINATION, A ROTOR MOUNTED FOR ROTATION ABOUT AN AXIS, FIRST AND SECOND POLES EACH OF WHICH HAS A POLE FACE DESCRIBING IN SECTION AN ARC OF A CIRCLE HAVING ITS CENTER ON SAID AXIS, SAID ROTOR HAVING A FIRST SURFACE CLOSELY RADIALLY SPACED FROM SAID FACE OF SAID FIRST POLE BY A FIRST GAP AND A SECOND SURFACE CLOSELY RADIALLY SPACED FROM SAID FACE TO SAID SECOND POLE BY A SECOND GAP, EACH OF SAID FIRST AND SECOND SURFACES OF SAID ROTOR DESCRIBING IN SECTION AN ARC OF A CIRCLE WHOSE CENTER IS ON SAID AXIS, MEANS FORMING A THIRD GAP AXIALLY EXTENDING IN SAID FACE OF SAID FIRST POLE TO DIVIDE IT INTO FIRST AND SECOND POLE PIECES, SAID FIRST SURFACE OF SAID ROTOR EXTENDING ACROSS SAID THIRD GAP TO BE OPPOSITE BOTH SAID FIRST AND SECOND POLE PIECES, A FIRST MAGNETIC CONNECTED BETWEEN SAID FIRST AND SECOND POLES SO AS TO PASS A FIRST MAGNETIC FIELD THROUGH SAID ROTOR BY WAY OF SAID FIRST AND SECOND POLES AND SAID FIRST ANS SECOND GAPS, A COIL ARRANGED TO DEVELOP A SECOND MAGNETIC FIELD PASSING BETWEEN SAID FIRST AND SECOND POLE PIECES BY WAY OF SAID FIRST GAP AND SAID ROTOR, THE RELUCTANCE OF THE PATH OF SAID FIRST MAGNETIC FIELD BEING SUBSTANTIALLY GREATER THAN THAT OF SAID SEOCOND FIELD.