Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Plural – diverse motor controls
Patent
1978-02-21
1980-10-07
Smith, Jr., David
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Plural, diverse motor controls
318 78, 318625, H02P 546, G05D 1362, G03B 3104
Patent
active
042271266
ABSTRACT:
There is disclosed apparatus suitable for use in conjunction with film editing tables or other devices requiring precise control over shaft rotation speed, that is, apparatus for interlocking two or more shaft rotating systems to rotate one or more slave shafts in precise speed synchronism with one remote master shaft. For each slave shaft to be controlled, there is provided a differential amplifier connected in a velocity servo loop designed to force the slave shaft to rotate in precise speed synchronism with a remote or line master shaft. The primary feedback loop comprises means for generating trains of pulses having a characteristic representative of each of the rotational speeds and for deriving from these pulse trains analog voltages which are applied to a differential amplifier to produce an error signal to be driven to zero for controlling the speed of the slave shaft. In addition to the primary feedback loop thus maintaining the basic speed synchronism, there is also provided a secondary feedback loop which includes means for deriving a third analog voltage proportional to the digitally measured difference between the representative characteristics of the first and second trains of digital pulses. This third analog voltage is combined with one of the first or second analog voltages to form a composite input to the differential amplifier. The third analog voltage is derived through a secondary feedback loop parallel to the primary loop and serves to maintain the shaft speed in precisely interlocked synchronism.
REFERENCES:
patent: 3118097 (1964-01-01), Hettler
patent: 3543112 (1970-11-01), Richmond
patent: 3906327 (1975-09-01), O'Callaghan et al.
patent: 3932794 (1976-01-01), Iwako
Kessler, G., "Digitale Regelung der Relation Zweier Drehzahlen", Elektrotechnisce Zeitschrift, Ausgabe A, vol. 82, 8-28-61, pp. 576-578.
Fritzsche, W., "Digitale Regelung Von Drehzahlverhaltnissen", AEG Mitteilungen, vol. 51, Mar./Apr. 1961, p. 144.
Dessner et al., "Digital Control Applications", Iron & Steel Engineer, vol. 48, No. 10, pp. 72-80.
Drucker I. Morley
Mutter Michael K.
Smith Jr. David
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