Brushless d.c. motor

Claim 1

A DEVICE OF THE CLASS DESCRIBED COMPRISING A D.C. SUPPLY, A TORQUE PRODUCING UNIT, A STATIC SWITCHING MEANS; SAID UNIT INCLUDING A ROTOR AND A STATOR; SAID SWITCHING MEANS OPERATIVELY CONNECTED TO SAID STATOR FOR CONTROLLING ENERGIZATION THEREOF- SAID STATOR HAVING A MAIN WINDING MEANS INCLUDING A PLURALITY OF COIL PORTIONS JOINED TO SAID SWITCHING MEANS AT A PLURALITY OF JUNCTURE POINTS IN A CLOSED LOOP CIRCUIT; SAID D.C. SUPPLY HAVING A POSITIVE AND A NEGATIVE TERMINAL; SAID SWITCHING MEANS INCLUDING A FIRST AND A SECOND GROUP OF SECTIONS; EACH OF SAID JUNCTURE POINTS CONNECTED TO SAID POSITIVE TERMINAL BY AN INDIVIDUAL SECTION OF SAID FIRST GROUP; EACH OF SAID JUNCTURE POINTS CONNECTED TO SAID NEGATIVE TERMINAL BY AN INDIVIDUAL SECTION OF SAID SECOND GROUP; SAID CONTROL MEANS INCLUDING A RADIATION PRODUCING SOURCE AND DIRECTING MEANS FOR CONTROLLING RADIATION EMANATING FROM SAID SOURCE; EACH OF SAID SECTIONS INCLUDING AN ELEMENT SENSITIVE TO SAID RADIATION EMANATING FROM SAID SOURCE; SAID DIRECTING MEANS INCLUDING A PORTION MOUNTED FOR ROTATION BY SAID ROTOR AND CONSTRUCTED TO CONTROL IMPINGEMENT OF SAID RADIATION FROM SAID SOURCE UPON SELECTED ONES OF SAID ELEMENTS AS A FUNCTION OF ROTOR POSITION; EACH OF SAID SECTIONS PRESENTING A RELATIVELY LOW IMPEDANCE TO CURRENT FLOW FROM SAID D.C. SUPPLY THROUGH SAID STATOR UPON IMPINGEMENT OF SAID RADIATION ON ITS RESPECTIVE ELEMENT AND ESSENTIALLY BLOCKING SAID CURRENT FLOW UNDER OTHER CONDITIONS; SAID PORTION BEING PHYSICALLY SPACED FROM SAID SWITCHING MEANS AND OPERATIVELY POSITIONED TO CONTROL OPERATION THEREOF WHEREBY FOR ANY GIVEN POSITION OF SAID ROTOR PREDETERMINED ONES OF SAID JUNCTURE POINTS ARE PROVIDED WITH LOW IMPEDANCE CONNECTIONS TO SAID TERMINALS AND ALL OF SAID COIL SECTIONS ARE ENERGIZED WITH DIRECTIONS OF RESPECTIVE CURRENTS IN SAID COIL SECTIONS BEING A FUNCTION OF ROTOR POSITION; SAID PORTION CONSTRUCTED TO SUBJECT AT LEAST TWO OF SAID ELEMENTS TO SAID RADIATION FROM SAID RADIATION PRODUCING SOURCE FOR ALL POSITIONS OF SAID ROTOR; SAID ELEMENTS POSITIONED SO THAT FOR ANY GIVEN POSITION OF SAID ROTOR SAID SWITCHING MEANS PROVIDES A COMPLETE LOW IMPENDANCE CONNECTION FOR D.C. CURRENT FLOW FROM SAID D.C. SUPPLY THROUGH SAID MAIN WINDING MEANS; SAID PLURALITY OF JUNCTURE POINTS BEING AN ODD NUMBER NO LESS THAN THREE; SAID ELEMENTS POSITIONED SO THAT FOR ANY GIVEN POSITION OF SAID ROTOR A SECTION FROM EACH OF SAID GROUPS PRESENTS A LOW IMPEDANCE CONNECTION BETWEEN SAID MAIN WINDING MEANS AND SAID D.C. SUPPLY; FOR A FIRST ZONE OF ANGULAR POSITIONS OF SAID ROTOR SAID PLURALITY OF COIL PORTIONS PROVIDING FIRST AND SECOND PARALLEL PARTS OF LOW IMPEDANCE CURRENT PATHS BETWEEN SAID TERMINALS OF SAID D.C. SUPPLY; SAID FIRST PART HAVING AN IMPEDANCE GREATER THAN THE IMPEDANCE OF SAID SECOND PART.

Claim 2

A DEVICE OF THE CLASS DESCRIBED COMPRISING A D.C. SUPPLY, A TORQUE PRODUCING UNIT, A STATIC SWITCHING MEANS; SAID UNIT INCLUDING A ROTOR AND A STATOR; SAID SWITCHING MEANS OPERATIVELY CONNECTED TO SAID STATOR FOR CONTROLLING ENERGIZATION THEREOF- SAID STATOR HAVING A MAIN WINDING MEANS INCLUDING A PLURALITY OF COIL PORTIONS JOINED TO SAID SWITCHING MEANS AT A PLURALITY OF JUNCTURE POINTS IN A CLOSED LOOP CIRCUIT; SAID D.C. SUPPLY HAVING A POSITIVE AND A NEGATIVE TERMINAL; SAID SWITCHING MEANS INCLUDING A FIRST AND A SECOND GROUP OF SECTIONS; EACH OF SAID JUNCTURE POINTS CONNECTED TO SAID POSITIVE TERMINAL BY AN INDIVIDUAL SECTION OF SAID FIRST GROUP; EACH OF SAID JUNCTURE POINTS CONNECTED TO SAID NEGATIVE TERMINAL BY AN INDIVIDUAL SECTION OF SAID SECOND GROUP; SAID CONTROL MEANS INCLUDING A RADIATION PRODUCING SOURCE AND DIRECTING MEANS FOR CONTROLLING RADIATION EMANATING FROM SAID SOURCE; EACH OF SAID SECTIONS INCLUDING AN ELEMENT SENSITIVE TO SAID RADIATION EMANATING FROM SAID SOURCE; SAID DIRECTING MEANS INCLUDING A PORTION MOUNTED FOR ROTATION BY SAID ROTOR AND CONSTRUCTED TO CONTROL IMPINGEMENT OF SAID RADIATION FROM SAID SOURCE UPON SELECTED ONES OF SAID ELEMENTS AS A FUNCTION OF ROTOR POSITION; EACH OF SAID SECTIONS PRESENTING A RELATIVELY LOW IMPEDANCE TO CURRENT FLOW FROM SAID D.C. SUPPLY THROUGH SAID STATOR UPON IMPINGEMENT OF SAID RADIATION ON ITS RESPECTIVE ELEMENT AND ESSENTIALLY BLOCKING SAID CURRENT FLOW UNDER OTHER CONDITIONS; SAID PORTION BEING PHYSICALLY SPACED FROM SAID SWITCHING MEANS AND OPERATIVELY POSITIONED TO CONTROL OPERATION THEREOF WHEREBY FOR ANY GIVEN POSITION OF SAID ROTOR PREDETERMINED ONES OF SAID JUNCTURE POINTS ARE PROVIDED WITH LOW IMPEDANCE CONNECTIONS TO SAID TERMINALS AND ALL OF SAID COIL SECTIONS ARE ENERGIZED WITH DIRECTIONS OF RESPECTIVE CURRENTS IN SAID COIL SECTIONS BEING A FUNCTION OF ROTOR POSITION; SAID PORTION CONSTRUCTED TO SUBJECT AT LEAST TWO OF SAID ELEMENTS TO SAID RADIATION FROM SAID RADIATION PRODUCING SOURCE FOR ALL POSITIONS OF SAID ROTOR; SAID ELEMENTS POSITIONED SO THAT FOR ANY GIVEN POSITION OF SAID ROTOR SAID SWITCHING MEANS PROVIDES A COMPLETE LOW IMPENDANCE CONNECTION FOR D.C. CURRENT FLOW FROM SAID D.C. SUPPLY THROUGH SAID MAIN WINDING MEANS; SAID PLURALITY OF JUNCTURE POINTS BEING AN ODD NUMBER NO LESS THAN THREE; SAID ELEMENTS POSITIONED SO THAT FOR ANY GIVEN POSITION OF SAID ROTOR A SECTION FROM EACH OF SAID GROUPS PRESENTS A LOW IMPEDANCE CONNECTION BETWEEN SAID MAIN WINDING MEANS AND SAID D.C. SUPPLY; FOR A FIRST ZONE OF ANGULAR POSITIONS OF SAID ROTOR SAID PLURALITY OF COIL PORTIONS PROVIDING FIRST AND SECOND PARALLEL PARTS OF LOW IMPEDANCE CURRENT PATHS BETWEEN SAID TERMINALS OF SAID D.C. SUPPLY; SAID FIRST PART HAVING AN IMPEDANCE GREATER THAN THE IMPEDANCE OF SAID SECOND PART.