Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1986-10-14
1988-05-10
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318561, 318567, 400124, 101 93, G05B 1128
Patent
active
047438215
ABSTRACT:
The trajectory of an electromagnetic actuator is adjusted by pulse-width-modulating feedback control of the waveform which energizes the coil. As applied to actuators for impact printing, the objectives of the control scheme are to regulate the armature's time of flight and its velocity at impact, in spite of disturbances, thereby to provide higher-quality printing at increased speed. Each actuation is produced by energizing the coil with a series of pulses. Regulation is accomplished under microprocessor control by measuring the state variables of the system--armature position, armature velocity, and coil current--at the beginning of each pulse, comparing these measurements to ideal values, and modulating the width of the pulse as a function of the errors. In general, the appropriate functional relationship between the measured errors and the pulse-width modulation is nonlinear, and is different for each pulse in the series. Systematic means for determining these relationships are given.
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Feig Philip J.
International Business Machines - Corporation
Kling Carl C.
Martin D.
Shoop Jr. William M.
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