Richard Heming is an RF and analog design engineer with the Institute for Analytical Sciences, Dortmund, Germany. He holds a diplom (FH) degree in electrical engineering from the University of Applied Sciences, Dusseldorf, Germany, and a diplom II from the University of Hagen, Germany. Email address: heming@isas.de Web site: http://www.isas.de
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May 22, 2008[Ideas For Design] Use PWM To Maintain Motor Speed And Phase While Eliminating Loop Filter
In designing a simple spectroscopy setup, we needed to synchronize the speed of a small, inexpensive dc motor precisely to 6000 rpm (100 Hz). Our first idea was to take a phase-frequency detector type of phase-locked loop (PLL), the CMOS 4046, to maintain not only the speed, but also the phase to the reference signal. 1 In the classical approach, the motor’s speed is modeled as a firstorder time delay over time. Some math is done to obtain a good ...
