Motor control system for a direct current traction motor
Abstract
Abstract A MOTOR POWER SUPPLY SYSTEM FOR A DIRECT CURRENT TRACTION MOTOR WHICH IS UTILIZED TO PROPEL A MOTOR VEHICLE. THE TRACTION MOTOR AND A SOURCE OF DIRECT CURRENT ARE CONNECTED BY A SWITCHING DEVICE WHICH TAKES THR FORM OF A SILICON CONTROLLED RECTIFIER. THE "ON" AND "OFF" TIMES OF THE CONTROLLED RECTIFIER ARE PROGRAMMED SUCH THAT THE "ON" TIME IS CONTROLLED AS A FUNCTION OF MOTOR SPEED AND INCREASES AS MOTOR SPEED INCREASES. THE "OFF" TIME FOR THE CONTROLLED RECTIFIER IS CONTROLLED AS A FUNCTION OF THE SETTING OF AN ACCELERATOR PEDAL FOR CONTROLLING THE VEHICLE AND AS THE ACCELERATOR PEDAL IS DEPRESSED THE "OFF" TIME OF THE CONTROLLED RECTIFIER DECREASES. THE SYSTEM, IN ADDITION TO THE CONTROL CIRCUIT THAT HAS BEEN DESCRIBED, INCLUDES A TORQUE LIMIT CIRCUIT, A SPEED LIMIT CIRCUIT, A FAULT SENSING CIRCUIT AND AN ARRANGEMENT FOR PREVENTING THE VEHICLE FROM BEING SHIFTED FROM A FORWARD CONDITION OF MOVEMENT TO A REVERSE CONDITION OF MOVEMENT OF VICE VERSA WHENEVER THE PROPULSION MOTOR HAS A SPEED WHICH IS HIGHER THAN A PREDETERMINED VALUE.
Inventors
- 👤 William D Worrell
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |