A.-c. switch speed control system for a.-c. motors

• US 3,307,094 A
• Filed: 12/30/1963
• Issued: 02/28/1967
• Est. Priority Date: 12/30/1963
• Status: Expired due to Term

• Current Assignee: Malcolm Ogle Hugh
• Original Assignee: Malcolm Ogle Hugh
• Inventors: MALCOLM OGLE HUGH
• Application Number:
  US04/334,247
• Time in Patent Office: 1,156 Days
• US Class Current: 318/810
• CPC Class Codes: H02P 25/10 Commutator motors, e.g. repulsion motors
• CPC Class Codes: Y10S 388/917 Thyristor or scr

Claims

1. IN A DEVICE FOR CONTROLLING THE SPEED OF MOTORS OF THE INDUCTION AND SYNCHRONOUS TYPES, THE COMBINATION OF:

A SOURCE OF AN A.-C. POTENTIAL;

A PAIR OF INPUT TERMINALS TO WHICH SAID A.-C. POTENTIAL IS APPLIED;

A FIRST SILICON CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE, AND A GATE ELECTRODE;

A SECOND SILICON CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE, AND A GATE ELECTRODE;

MEANS CONNECTING THE FIRST SILICON CONTROLLED RECTIFIER ANODE AND THE SECOND SILICON CONTROLLED RECTIFIER CATHODE TO ONE OF THE A.-C. INPUT TERMINALS;

MEANS CONNECTING THE FIRST SILICON CONTROLLED RECTIFIER CATHODE AND THE SECOND SILICON CONTROLLED RECTIFIER ANODE TO THE MOTOR;

A FIRST TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING;

MEANS CONNECTING THE FIRST TRANSFORMER PRIMARY WINDING ACROSS THE SOURCE OF A.-C. POTENTIAL;

A FIRST POTENTIOMETER HAVING AN OUTPUT TERMINAL;

MEANS CONNECTING THE POTENTIOMETER IN PARALLEL WITH THE FIRST TRANSFORMER SECONDARY WINDING;

MEANS CONNECTING THE FIRST POTENTIOMETER OUTPUT TERMINAL TO THE FIRST SILICON CONTROLLED RECTIFIER GATE ELECTRODE;

A SECOND TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING;

MEANS CONNECTING THE SECOND TRANSFORMER PRIMARY WINDING ACROSS THE MOTOR BETWEEN THE A.-C. POTENTIAL SOURCE AND THE FIRST SILICON CONTROLLED RECTIFIER CATHODE;

A SECOND POTENTIOMETER HAVING AN OUTPUT ARM;

MEANS CONNECTING THE SECOND POTENTIOMETER ACROSS THE SECOND TRANSFORMER SECONDARY WINDING AND TO THE SECOND SILICON CONTROLLED RECTIFIER CATHODE;

MEANS CONNECTING THE SECOND POTENTIOMETER OUTPUT ARM TO THE SECOND SILICON CONTROLLED RECTIFIER GATE ELECTRODE;

A SATURABLE REACTOR HAVING A REACTANCE WINDING AND A CONTROL WINDING;

MEANS CONNECTING THE SATURABLE REACTOR REACTANCE WINDING ACROSS THE FIRST TRANSFORMER SECONDARY WINDING;

AND MEANS FOR PERIODICALLY PASSING A CONTROL CURRENT THROUGH THE SATURABLE REACTOR CONTROL WINDING TO CYCLICALLY SATURATE FOR A SELECTED VARIABLE PERIOD SAID SATURABLE REACTOR.