System for controlling magnitude and phase of terminal voltage for adjustable speed synchronous motor
Abstract
Abstract A SYSTEM FOR GENERATING A CONTROL SIGNAL FOR AN ADJUSTABLE SPEED SYNCHRONOUS MOTOR WHICH IS A REPLICA OF THE DESIRED TERMINAL VOLTAGE TO BE APPLIED TO THE MOTOR IN FREQUENCY, MAGNITUDE AND PHASE. IT INCLUDES TACHOMETER MEANS FOR DERIVING A SPEED SIGNAL WHICH IS A FUNCTION OF MOTOR SPEED, MEANS RESPONSIVE TO THE SPEED SIGNAL FOR GENERATING FIRST AND SECOND ALTERNATING SIGNALS IN ACCORDANCE WITH THE RECTANGULAR COORDINATES OF A CURVE WHOSE VARIABLE PARAMETER IS MOTOR SPEED AND WHOSE POLAR COORDINATES ARE DESIRED MAGNITUDE AND PHASE ANGLE OF MOTOR TERMINAL VOLTAGE, AND ROTARY INDUCTOR, VECTOR ADDED MEANS WHICH CONVERTS THE ALTERNATING SIGNALS INTO AN OUTPUT SIGNAL WHOSE MAGNITUDE IS THE VECTOR SUM AND WHOSE PHASE ANGLE IS THE TANGENT OF THE QUOTIENT OF THE ALTERNATING SIGNALS. THE OUTPUT SIGNAL MAY CONTROL A FREQUENCY CHANGER WHICH ENERGIZES THE SYNCHRONOUS MOTOR.
Inventors
- 👤 Thomas P Gilmore
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |