Brushless dc motor

Claim 1

A COMMUTATORLESS DIRECT CURRENT MOTOR COMPRISING IN COMBINATION: A ROTATING FIELD STRUCTURE; A STATIONARY ARMATURE HAVING A PLURALITY OF ARMATURE WINDINGS; MEANS FOR DETECTING THE ANGULAR POSITION OF SAID ROTATING FIELD AND CREATING A SIGNALS REPRESENTATIVE THEREOF; MEANS FOR SWITCHING POWER TO SAID ARMATURE WINDINGS; A SELECTOR NETWORK FOR RECEIVING SAID SIGNAL AND ACTIVATING SAID ARMATURE WINDING SWITCHING MEANS IN ACCORDANCE THEREWITH; SAID ARMATURE WINDING SWITCHING MEANS INCLUDING A PLURALITY OF SCR''S OPERATING IN A SWITCHING MODE, EACH SCR HAVING A GATE, CATHODE AND ANODE ELECTRODES, THE GATE ELECTRODE BEING CONNECTED SO AS TO RECEIVE SAID SIGNAL IN ACCORDANCE WITH THE ANGULAR POSITION OF SAID ROTATING FIELD, THEREBY TO TURN ON SAID SCR; AND A PLURALITY OF COUPLING CAPCITORS EACH CONNECTED SO AS TO IMPOSE A NEGATIVE VOLTAGE UPON THE ANODE OF A FIRST SCR TO TURN OFF SAID SCR WHEN THE GATE ELECTRODE OF A SECOND SCR RECEIVES SAID SIGNAL; WHEREBY SAID SCR''S ARE SUCCESSIVELY TURNED ON SAID OFF IN RESPONSE TO THE ANGULAR POSITION OF SAID ROTATING FIELD TO PERMIT POWER TO BE APPLIED TO SAID ARMATURE WINDINGS; SAID ANGULAR POSITION DETECTING MEANS COMPRISES A FIRST COIL AND A SERIES OF STATIONARY COILS EQUAL IN NUMBER TO THE NUMBER OF SCR''S AND A ROTARY INDUCTIVE COUPLING MEMBER MOUNTED TO ROTATE WITH SAID FIELD STRUCTURE AND ADAPTED TO SEQUENTIALLY INDUCTIVELY COUPLED SAID FIRST COIL TO EACH OF SAID STATIONARY COIL, AND SAID STATIONARY COILS BEING EACH CONNECTED TO THE GATE ELECTRODE OF AN SCR, WHEREBY SUCCESSIVE PULSED SIGNALS ARE CREATED; AN OSCILLATOR CONNECTED TO DRIVE SAID FIRST COIL, EACH SCR HAVING ASSOCIATED THEREWITH A PAIR OF TRANSISTORS HAVING THEIR EMITTER-COLLECTOR PATH IN SERIES WITH THE ARMATURE WINDINGS AND THEIR BASE ELECTRODES IN CURCUIT WITH THE ANODE OF THEIR ASSOCIATED SCR, WHEREBY WHEN AN SCR IS TURNED ON IT WILL SERVE TO IMMEDIATELY TURN ON ITS ASSOCIATED PAIR OF TRANISTORS AND PERMIT POWER TO SAID WINDINGS.