Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-04-20
1984-08-21
Dobeck, B.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318783, 318434, 318473, 361 24, 361 23, 364474, H02H 708
Patent
active
044672608
ABSTRACT:
A microprocessor controlled motor starter is utilized in which the short term temperature differential between the rotor bars and the rotor end bells is accounted for by the microprocessor-based system as a function of operator programmed stall time and locked rotor current for the particular rotor in question. The latter information is supplied to the operator by the manufacturer of the motor. The foregoing takes into account a slight deviation between the shutdown temperature, which should be predicted as a function of the manufacturer's data, and the actual shutdown temperature as expressed by an exponential. In the event that the short term temperature differential is exceeded, the microprocessor will enter a TRIP routine causing the motor controller to shut the motor down, thus preventing serious damage to the motor.
REFERENCES:
patent: 3899726 (1975-08-01), Ellmore
patent: 3965396 (1976-01-01), Tyler et al.
patent: 4041540 (1977-08-01), Kampf et al.
patent: 4168456 (1979-09-01), Esobe
patent: 4281358 (1981-07-01), Plouffe et al.
patent: 4386305 (1983-05-01), Kohzai et al.
Thermal Tracking by Boothman et al., IEEE PES Winter Meeting, Jan. 1974, pp. 1335-1343.
A Quantitative Analysis by Dunki-Jacobs et al., pp. 125-132, Transactions on Industry Applications, Apr. 1981, vol. 1A-17, No. 2.
Microprocessor-Based Universal Motor Protection, by Turner et al., Jan. 1981, pp. 58-62, IEEE Transaction on Ind. Appl., vol. 1A 17, No. 1.
SMP for Motor Protection by Switchgear and Control Div., pp. 1-8, 41-560(E), Nov. 1981.
Mallick, Jr. George T.
Maynard Pamela M.
Dobeck B.
Evans Arthur G.
Moran M. J.
Westinghouse Electric Corp.
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