Arrangement for generating a rotary movement at a variable speed

Claim 1

A DEVICE FOR PRODUCING A CONTROLLED VARIABLE-SPEED ROTATION COMPRISING: (A) AN ASYNCHRONOUS MOTOR COMPRISING A SQUIRREL-CAGE ROTOR, THE SPEED OF ROTATION OF WHICH IS TO BE CONTROLLED, AND A STATOR WINDING; (B) AN ALTERNATOR COMPRISING A ROTARY ARMATURE MECHANICALLY DRIVEN BY SAID SQUIRREL-CAGE ROTOR AND A FIELD-PIECE OIF THE POLYPHASE TYPE PRODUCING A ROTATING FIELD WHICH TURNS AT A RATE EQUAL TO THE SLIP FREQUENCY VOLTAGE INDUCED IN SAID SQUIRREL-CAGE ROTOR; (C) POWER AMPLIFIER MEANS HAVING INPUTS CONNECTED TO SAID ARMATURE AND OUTPUTS CONNECTED TO SAID STATOR WINDING FOR SUPPLYING EXCITATIO ENERGY TO THE LATTER; (D) A SOURCE OF POLYPHASE SIGNALS CONNECTED TO SAID ALTERNATOR FIELD-PIECE FOR SUPPLYING EXCITATION ENERGY THERETO; (E) A D.C. POWER SUPPLY CONNECTED TO THE CENTR OF EACH PHASE OF SAID FIELD-PIECE; (F) A PLURALITY OF ELECTRONICALLY CONTROLLED SWITCH MEANS CONNECTED TO EACH END OF EACH OF SAID PHASE FOR CONTROLLING THE DIRECTION OF CURRENT FLOW FROM SAID POWER SUPPLY THROUGH EACH OF SAID PHASES; (G) RELAXATION OSCILLATOR MEANS GENERATING A CONTINUOUS TRAIN OF PULSES AT A RATE EQUAL TO 2NG, WHERE N EQUALS THE NUMBER OF PHASES OF SAID FIELD-PIECE AND G EQUALS THE SLIP FREQUENCY INDUCED IN SAID SQUIRREL-CAGE ROTOR; (H) SUBDIVIDING DISTRIBUTING MEANS FED BY SAID RELAXATION OSCILLATOR MEANS; AND (I) LOGICAL DECODING CIRCUITRY FED BY SAID DISTRIBUTING MEANS AND COMPRISING ONE LOGIC UNIT FOR EACH OF SAID SWITCH MEANS FOR FEEDING THERETO PULSES AT A RATE G FOR GENERATING A ROTATING FIELD IN SAID FIELDPIECE.

Claim 2

A DEVICE FOR PRODUCING A CONTROLLED VARIABLE-SPEED ROTATION COMPRISING: (A) AN ASYNCHRONOUS MOTOR COMPRISING A SQUIRREL-CAGE ROTOR, THE SPEED OF ROTATION OF WHICH IS TO BE CONTROLLED, AND A STATOR WINDING; (B) AN ALTERNATOR COMPRISING A ROTARY ARMATURE MECHANICALLY DRIVEN BY SAID SQUIRREL-CAGE ROTOR AND A FIELD-PIECE OIF THE POLYPHASE TYPE PRODUCING A ROTATING FIELD WHICH TURNS AT A RATE EQUAL TO THE SLIP FREQUENCY VOLTAGE INDUCED IN SAID SQUIRREL-CAGE ROTOR; (C) POWER AMPLIFIER MEANS HAVING INPUTS CONNECTED TO SAID ARMATURE AND OUTPUTS CONNECTED TO SAID STATOR WINDING FOR SUPPLYING EXCITATIO ENERGY TO THE LATTER; (D) A SOURCE OF POLYPHASE SIGNALS CONNECTED TO SAID ALTERNATOR FIELD-PIECE FOR SUPPLYING EXCITATION ENERGY THERETO; (E) A D.C. POWER SUPPLY CONNECTED TO THE CENTR OF EACH PHASE OF SAID FIELD-PIECE; (F) A PLURALITY OF ELECTRONICALLY CONTROLLED SWITCH MEANS CONNECTED TO EACH END OF EACH OF SAID PHASE FOR CONTROLLING THE DIRECTION OF CURRENT FLOW FROM SAID POWER SUPPLY THROUGH EACH OF SAID PHASES; (G) RELAXATION OSCILLATOR MEANS GENERATING A CONTINUOUS TRAIN OF PULSES AT A RATE EQUAL TO 2NG, WHERE N EQUALS THE NUMBER OF PHASES OF SAID FIELD-PIECE AND G EQUALS THE SLIP FREQUENCY INDUCED IN SAID SQUIRREL-CAGE ROTOR; (H) SUBDIVIDING DISTRIBUTING MEANS FED BY SAID RELAXATION OSCILLATOR MEANS; AND (I) LOGICAL DECODING CIRCUITRY FED BY SAID DISTRIBUTING MEANS AND COMPRISING ONE LOGIC UNIT FOR EACH OF SAID SWITCH MEANS FOR FEEDING THERETO PULSES AT A RATE G FOR GENERATING A ROTATING FIELD IN SAID FIELDPIECE.