Newsgroups: comp.robotics
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From: morrow@cns8.cns.ucalgary.ca (Bill Morrow)
Subject: Re: PWM DC motor control
Message-ID: <Mar18.181352.31507@acs.ucalgary.ca>
Date: Fri, 18 Mar 1994 18:13:52 GMT
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jpeskin@bear.WPI.EDU (Jonah Peskin) writes:

]    I'm looking for ways to control the speed of a few DC motors I wanted
]to use to drive a robot.  The only thing that I am aware of that will do this
]is to use a pulse wideth modulated oscillating signal to drive some power
]transistors which drive the motors.  The idea being that a lower duty cycle
]signal will rsult in slower motor rotation.  

Is anyone trying to actually vary the driving voltage to the motor,
using some feedback from shaft encoders? You know, just like they 
taught you in that control systems course. It seems to me that this
type of control system would be more efficient, responsive and cover
a wider range of motor speed.

My life keeps getting in the way, so I haven't done it myself yet.

------------------------------------------------------------------------
Bill Morrow    Clinical Neurosciences, University of Calgary
e-mail: morrow@cns.ucalgary.ca voice: (403) 220-6275 fax: (403) 283-8770 
HMRB 105, 3330 Hospital Drive NW Calgary, Alberta, CANADA T2N 4N1
