Subject:
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Re: Using motors without a power source.
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 26 Jan 1999 15:25:17 GMT
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Original-From:
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Jeff Jackowski <JEFFJ@RO.ihatespamCOM>
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Viewed:
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1039 times
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On Mon, 25 Jan 1999, Denny Hyde wrote:
> > In your 4 motor system was every motor being used both as a >differential and
> > as a power source? Or was there no power source involved?
> I'm not using any power source at all. Basically I was trying to build a 4WD
> car with strange wheel placement that made it very difficult to connect them
> using gears, axels, and differentials. I decided that maybe I could use a
> motor for each wheel instead and connect them with wires. I've read that some
> of the electric car designs used this method. I would then connect at least
> one of the motors to a power source (a battery pack or RCX for example).
> However, before I connected the power source I notice that when I turned one
> of the tires, all of the tires turned!!!
That makes perfect sense. If you turn any electromagnetic motor, it will
produce an electric current. I think this is the basic principle that
hydroelectric power plants use. Even old Lego motors do this (I tried when
I was a kid with many Legos).
The important question is: what gear ratio were you getting? Granted you
have no physical gear, just electrons, but at least under a load turning
one wheel will not trun the others at the same rate.
Of course, linking all the motors in parallel should allow them to be
controlled simultaneously at the same rate by the RCX. I think that was
your original plan?
Jeff Jackowski
http://ro.com/~jeff/
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Using motors without a power source.
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| (...) That's correct. (...) The main benefit is that I was able to use any design I wanted without being restricted on how and where to place the axels. I could run the wire in any manner I needed. (...) I'm not using any power source at all. (...) (25 years ago, 25-Jan-99, to lugnet.robotics)
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