Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1980-03-10
1985-08-27
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318803, H02P 540
Patent
active
045381003
ABSTRACT:
This relates to a low cost reliable controller which may be used in conjunction with induction motors or, more generally, to generate AC power from a DC source. The system utilizes a microprocessor in combination with low cost parallel transistors to provide the control function. A feedback module monitors the actual rotor speed and conveys this information back to the microprocessor. A voltage boost module may be used in combination with the microprocessor and switching circuits to optimize the overall efficiency of the system. The microprocessor computes slip and controls the voltage drive in order to further optimize efficiency of the system as a function of motor speed. Both the footfeed voltage and boosted voltage are analog voltages and are applied to an A/D converter. The output of the A/D converter presents a digital representation of the footfeed voltage or boost voltage to the microprocessor.
REFERENCES:
patent: 3675699 (1972-07-01), Johnston
patent: 4090115 (1978-05-01), Franz, Jr.
patent: 4091294 (1978-05-01), Zankl et al.
patent: 4217527 (1980-08-01), Bourke et al.
patent: 4282465 (1981-08-01), Acker et al.
Le-Huy et al., "Microprocessor Control of a Current-Fed Synchronous Motor Drive," Conference: Industry Applications Society IEEE-IAS Annual Meeting, Cleveland Oh., (Sep. 30-Oct. 4, 1979), p. 873.
Eisenhaure et al., "High Efficiency Controlled Slip Induction Motor Drive for Electric Vehicles," Conference: Proceedings of the 14th Intersociety Energy Conversion Engineering, Boston, Ma. Aug. 5-10, 1979.
Lukas, "Microprocessor Control of a AC Drive," Conference: Industry Applications Society IEEE-IAS Annual Meeting, Cleveland, (Sep. 30-Oct. 4, 1979), pp. 881-885.
Bergquist Bertil R.
Crosby Kennith D.
Tuten William J.
Creative Technology Inc.
Smith Jr. David
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