Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1983-04-20
1984-10-09
Weldon, Ulysses
Electricity: motive power systems
Induction motor systems
Primary circuit control
361 29, 318782, H02H 708
Patent
active
044764235
ABSTRACT:
A microprocessor controlled motor starter is utilized in which an operator can preprogram within limits the number of starts which a motor can be subjected to in a programmed period of time to thus prevent destruction of the motor by accumulated overheating. Significantly more heat is generated during a start of a motor than during the run mode. The foregoing is accomplished by utilizing memory locations in which accumulated times from a first start are sequentially stored in order. If the time found in the latest memory location is larger than the predetermined maximum allowable time then the start is allowed to take place. If it is less than that time then the start is prevented from taking place and a readout alerts the operator as to how much time must expire before the next allowable start may take place. Once the maximum number of starts has been reached and the time increment has been determined to be allowable, the microprocessor will down shift the information into lower memory locations for subsequent utilization at the next attempted start.
REFERENCES:
patent: 3875487 (1975-04-01), White
patent: 4044288 (1977-08-01), Godfrey
"A Quantative Analysis of Grouped Single-Phase Induction Motor", by J. R. Dunki, Jacob et al., p. 125, Mar./Apr., 1981, vol. 1a-17, No. 2, of the IEEE Transactions on Industry App.
"Thermal Tracking--A Rational Approach to Motor Projection", by D. R. Boothman et al., p. 274029-5, of the IEE Transaction, Jan. 17-Feb. 1, 1974, at the IEEE PES Winter Meeting, New York, N.Y.
"Microprocessor-Based Universal Motor Protection System", by E. B. Turner et al., of the IEEE Transactions on Industry Application, vol. 1a-17, No. 1, Jan./Feb., 1981.
Motogard for Motor Protection by the Westinghouse Canada Switchgear and Control Division, issued Jan. 1980.
Mallick, Jr. George T.
Maynard Pamela M.
Evans A.
Moran M. J.
Weldon Ulysses
Westinghouse Electric Corp.
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