Re: Single cell boost help.

On Wed, 08 Feb 2006 20:33:37 -0800, newsrichie wrote:

I think I'm am allowed to use anything as long as i don't charge it
before the run. Would switching the voltage high before bringing it
back down hurt my efficiency? I really thought long and hard before
asking. My classmates and and I are truly stumped, next week is block
integration no one i know has anything reliable. Thanks for your reply

Look up "beam" robots... you have the same problem, which is a voltage
source which won't power your motors. They charge a cap, and then burst
the motor for a bit. The *average* power is thus decreased, and the
momentary power while the thing is going can be arbitrarily large.

You won't need supercaps for this, just normal caps. In fact, smaller caps
will allows the voltage to recover much faster, so you might be able to
keep the robot moving, thus working around the additional current required
to restart the motor if it stops.... Note that the actual power you can
pump into the motor is the same regardless of the cap size; all the size
does is select the frequency (vs pulse width) of the supply.

However, I have little johnson motors that will easily run down to 1V. A
gearbox could decrease the torque load on the motor sufficiently to allow
it to move, albeit slowly. You can get gearboxes online.

--
Regards,
Bob Monsen

There are two ways of resisting war: the legal way and the
revolutionary way. The legal way involves the offer of alternatinve
service not as a privilege for a few but as a right for all. The
revolutionary view involves an uncompromising resistance, with a view
to breaking the power of militarism in time of peace or the resources
of the state in time of war.
Albert Einstein (1879 - 1955)
.

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