The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: jmuchow@SPAMMENOTcamlight.com (John Muchow)
Subject: Re: Reducing contact resistance for low volt use?
Date: Wed, 08 Jan 2003 07:56:22 GMT
Organization: MindSpring Enterprises
References: <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org> <email@example.com> <firstname.lastname@example.org>
X-Server-Date: 8 Jan 2003 07:58:26 GMT
X-Newsreader: Forte Free Agent 1.21/32.243
>>> I have since shifted to a motor as a dyno as a solution. :-]
>>>You get high current situation, and real power data at the motor end.
>>>You could even hook up the exact same voltage rails as are in the
>>>chassis of the bot, and get real data at the presumed motor connection
>>>site. Any motor. The dyno, overkill motor, or the actual motors you
>>>will be using. Probably more repeatable, controlled data. Your
>>>dynamic load IS your real world load, and with a calibrated brake
>>>pressure monitoring method, you get dynamic as well as stall data.
>>>Allowing for cool downs between "burst runs" will extend the motor's
>>>life. The dyno motor could be one that you simply cannot blow, but is
>>>too big for the bot chassis. Perfect for a dyno chassis. :-]
The motor-as-load would be a better (or exact) match to the
application for the cells, but we need the constant-current discharge
curve to compare with the manufacturer's claimed specs for the cells.
With all of the possible variables affecting the results of our data,
the constant-current curves are a nice starting point for comparisons.
We will be hooking up one of our BASIC Stamps to adjust the MOSFET
gate voltage to simulate a varying (and perfectly repeatable) load.
Not a perfect solution, but a good one to compare cells against each
other. The repeatability is very important as all sorts of different
cells are made by the manufacturers in the future. We'll also need
that repeatability to re-test cells that have been used for varying
periods of time.
-- Remove "SPAMMENOT" to reply via e-mail --
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup