Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-01-31
1987-06-16
Smith, Jr, David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318811, H02P 540
Patent
active
046738592
ABSTRACT:
An arrangement of interconnected timers is provided for operation with a microprocessor programmed to determine time delay counts that are fed out to these timers such that the timers can take care of the actual task of firing GTO inverter switches or not firing GTO inverter switches coupled with an AC traction motor for a vehicle. It is necessary to have correct transitions between the minus GTO switch and the plus GTO switch being ON for providing the desired motor voltage conditions with minimum electromagnetic interference in relation to the power supply. In addition the use of timer queues in complicated synthesis modes like the PWM and the quasi six-step operates to give the microprocessor adequate operating time for reasonable control signal time duration calculations. The timers are synchronized in hardware by a single crystal frequency, and they are synchronized in software such that the three phase independent waveforms stay 120.degree. apart.
REFERENCES:
patent: 3899725 (1975-08-01), Plunkett
patent: 4028599 (1977-06-01), Zankl et al.
patent: 4466052 (1984-08-01), Thrap
Varnovitsky, M., "A Microcomputer-Based Control Signal Generator For A Three-Phase Switching Power Inverter", IEEE Transactions on Industry Applications, vol. IA-19, No. 2, Mar.-Apr. 1983, pp. 228-234.
LE-Huy et al, "Microprocessor Control of a Current-Fed Synchronous Drive" Conference Industry Applications Society IEEE-IAS Annual Meeting, Cleveland OH. USA, (Sep. 30-OCt. 4, 1979), pp. 873-880.
Dadpey Habib
Magee C. Scott
Shero David J.
Brzuszek J. L.
Smith, Jr David
Westinghouse Electric Corp.
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