Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1974-04-12
1977-08-02
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318610, G05B 1128
Patent
active
040399176
ABSTRACT:
A servosystem is comprised of an energy-storing controlled system having an output variable which is to be maintained at a predetermined value. An energy-varying unit, for example a source of electrical energy, is connected to the controlled system for energizing the latter. Alternatively, the energy-varying unit could be operative for removing energy from the controlled system. A two-mode control unit is operative in the first mode thereof for causing the energy-varying unit to effect a change in the energy stored by the controlled system, and is operative in the second mode thereof for preventing the energy-varying unit from effecting such change. An error-indicating unit is operative for generating an error signal indicative of the deviation of the output variable of the controlled system from the predetermined value to be maintained. A pulse-duration-modulating circuit is connected to the error-indicating means for receiving the error signal and for applying to the two-mode control unit an error-signal-dependent pulse-duration-modulated actuating signal whose dependence upon the error signal is such that increases in the deviation indicated by the error signal result in superproportional increases in the effective value of the actuating signal. In other words, if the deviation is plotted along the horizontal axis and the effective value of the pulse-duration-modulated actuating signal is plotted along the vertical axis, the resulting curve will be of increasing slope.
REFERENCES:
patent: 3131340 (1964-04-01), Johnson et al.
patent: 3505606 (1970-04-01), Werner
patent: 3639824 (1972-02-01), Malavasi
patent: 3665500 (1972-05-01), Lewis et al.
patent: 3745420 (1973-07-01), Hafner
patent: 3874407 (1975-04-01), Griswold
Bach Bernhard
Picmaus Ernst
Dobeck B.
Klein, Schanzlin & Becker Aktiengesellschaft
Striker Michael J.
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