Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1979-03-19
1980-09-16
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318601, 318621, G05B 1128
Patent
active
042232589
ABSTRACT:
A servo system wherein a servo motor is continuously controlled in response to a pulse width modulated digital command signal is disclosed. A servo motor having a variable output is controlled in response to a variable amplitude error signal. A pulse code converter converts a pulse code modulated digital command signal to provide a pulse width modulated digital command signal for controlling the variable output of the servo motor. The digital command signal is provided at a predetermined frame rate in response to a frame pulse signal. A feedback transducer and network senses the variable output of the servo motor and provides a variable amplitude feedback signal that is indicative of the variable output. A synchronous pulse forming network converts the variable amplitude feedback signal to a proportional pulse width modulated digital feedback signal. The digital feedback signal is provided at the predetermined frame rate and in synchronization with the digital command signal. The digital command signal is summed with the digital feedback signal to provide a digital error signal; and a pulse width-to-amplitude demodulator converts the digital error signal to a continuous variable ampliude error signal for continuously controlling the variable output of the servo motor. The pulse width-to-amplitude demodulator includes an integrator for integrating the digital error signal to provide an integrated error signal; and a zero order hold sampler for sampling the amplitude of the integrated error signal to provide the continuous variable amplitude output signal. The sampled amplitude is held for a full frame period as defined by the frame pulse signal.
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Callan Edward W.
Dobeck B.
General Dynamics Corporation
Johnson Edward B.
Martin Neil F.
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