Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1977-02-02
1980-06-03
Truhe, J. V.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318331, 318332, 318341, 318357, 318432, H02P 500, H02P 700
Patent
active
042063892
ABSTRACT:
A variable speed direct current shunt motor control system is disclosed for regulating the strength of the field to achieve and maintain a desired motor speed. The control system comprises a comparator circuit operable to compare a control voltage that is dependent on the armature voltage with a reference voltage that varies with torque demand. When the control voltage differs from the reference voltage, the comparator circuit develops a field demand or command signal that provides for the strengthening of the field to return the motor to the desired speed. A sensing circuit is incorporated into the control system to sense motor plugging and provide for field weakening.
REFERENCES:
patent: 3373331 (1968-03-01), Dow
patent: 3518518 (1970-06-01), Ford, Jr. et al.
patent: 3569809 (1971-03-01), Comer
patent: 3599064 (1971-08-01), Friedman
patent: 3845368 (1974-10-01), Elco
patent: 3855512 (1974-12-01), Konrad
patent: 3944898 (1976-03-01), Wright
patent: 3962612 (1976-06-01), Kawasaki
patent: 4019107 (1977-04-01), Dixon et al.
Millman et al., "Pulse, Digital and Switching Waveforms," 1965, pp. 389-394.
Clark Equipment Company
Indyk Eugene S.
Truhe J. V.
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