Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1977-04-04
1979-02-06
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318341, 332 9R, G05B 1128
Patent
active
041386329
ABSTRACT:
A pulse width modulator digital servo system combines a digital feedback signal, which is developed in response to a time based signal directly indicative of a positional physical parameter of a servo actuator, and a digital command signal, which is indicative of a desired position of the servo actuator, to produce a digital resultant signal. A pulse width modulator produces a control signal output that is pulse width modulated in accordance with the digital value of the resultant signal to control operation of the servo actuator to achieve the positional relationship commanded. The pulse width modulated control signal is balanced when the combined resultant signal has a predetermined or constant value and is unbalanced in respective directions depending on whether the combined resultant signal is larger or smaller than such predetermined value.
REFERENCES:
patent: 3516331 (1970-06-01), Oelrich et al.
patent: 3950682 (1976-04-01), Dohanich, Jr.
patent: 3997855 (1976-12-01), Nash
patent: 4064443 (1977-12-01), Yamada
Pauwels Michael A.
Tew Sydney K.
Dobeck B.
Pneumo Corporation
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