Patent
Motor speed control system
TLDR
In this article, a motor speed control system for reducing instantaneous speed variations as a result of hunting in hysteresis synchronous motors utilized to drive optical scanners by controlling the frequency of the drive signal applied to the motor is presented.Abstract:
A motor speed control system for reducing instantaneous speed variations as a result of hunting in hysteresis synchronous motors utilized to drive optical scanners by controlling the frequency of the drive signal applied to the motor. A laser beam is reflected from the facets of the optical scanner and scans a surface along a scan line, a signal being generated at the start and end of each scan line. A counter is driven by an accurate clock which is started and stopped in accordance with the start and end of scan signals. The resulting count of the counter is thus inversely proportional to the speed of the motor and is converted to an analog input signal and coupled to a voltage controlled oscillator whose frequency is controlled for driving the motor such that undesirable oscillations of the motor are damped out. Additional embodiments for controlling the motor speed are disclosed which utilize only the start of scan signal to both start and stop the counter.read more
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TL;DR: In this article, the authors present a circuit for controlling the amplitude of a self-resonant scanner including a first means for measuring the time to complete a number of full cycle scanner movements, and a second means to complete the number of movements between a first fixed point and another fixed point in the scan path and logic means using such time measurements to determine whether the scanner amplitude is greater or less than a desired amplitude.
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Patent
Non-contacting measuring probe
TL;DR: In this paper, a non-contacting optical probe capable of giving a continuous reading of the distance from a given reference to a contoured surface is presented, where a collimated beam is projected on a first optical axis to the surface to be measured.
Patent
Speed control for a synchronous motor
John B Sampson,Hadyn L Smith +1 more
TL;DR: In this paper, a motor control means to accomplish frequency changing which in turn achieves a speed change in a synchronous motor comprising a voltage controlled oscillator which responds to a discriminator circuit which either increases or decreases the frequency output of the oscillator in accordance with whether a synchronizing pulse is early or late with respect to an enabling pulse.