Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!cs.utexas.edu!utnut!cannon.ecf!chengb
From: chengb@ecf.toronto.edu (CHENG  BENJAMIN)
Subject: help...battery power
Message-ID: <CLE7A0.FIB@ecf.toronto.edu>
Sender: news@ecf.toronto.edu (News Administrator)
Organization: University of Toronto, Engineering Computing Facility
Date: Thu, 17 Feb 1994 23:44:23 GMT
Lines: 23

Hello,

      I am building a self-contained robotic biped and I confront a
      problem of not enough power from the battery to drive the
      motors. The dc gear-motors that I use are 12.8V, and I need
      to use dry cells to drive four motors.         My question
      is: How many batteries do I need in order to drive the motors
      half an hour? Of course the main consideration is the weight
      because I don't want to put too much weight on my robot.
      I am thinking to use DC-DC converter or voltage regulator to
      step down the voltage by connecting several 9V batteries
      together and increase the current, but I am not really sure
      whether it is a suitable way to do or not.

      If you have any suggestions, please post here or email to me
      and I will very appreciate that. Thank you.

						 Benjamin Cheng
					   University of Toronto
					   (chengb@ecf.toronto.ca)
      N.B. The current of a motor can run is 0.55., 20 oz.in. at
      120 RPM, and the weight of my biped is about 800g.

