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Re: [PSUBS-MAILIST] PWM Controllers
FYI,
I have said for some time that the downfall of our civilization will be the
use of acronyms. It is almost getting to point where people can't
understand each other.
Is the end of communication the end of civilization??
LOL. (-: ......
I think PWM is "pulse width modulation" ??
The DC motor is turned on and off rapidly to reduce the power going to it
instead of using as resistor to run at less than full throttle. (though
electric motors don't actually have throttles)
Robin Williams does a good bit on it in Good Morning Vietnam.
MECHANICAL GUY ,
Jay.
John Rogers
<djohnndjinn@yahoo.com> To: personal_submersibles@psubs.org
Sent by: cc:
owner-personal_submersible Subject: Re: [PSUBS-MAILIST] PWM Controllers
s@psubs.org
20/01/2003 07:27 PM
Please respond to
personal_submersibles
FET = field effect transistor
SCR = silicon controlled rectifier
--John
"Dale A. Raby" <publisher@thegreenbayweb.com> wrote:
Militarese translation:
LT = Lieutenant
MRE's = Meals Rejected by Ethiopians (US soldiers and sailors eat 'em
though)
AWOL = Absent WithOut Leave
SOL = Shit Outa Luck
Now... I'd kinda like to know what FET's SCR's etc are as well!
On Mon, 2003-01-20 at 19:34, Chris Nugent wrote:
Would someone mind yelling down to the little people and
explaining what exactly FET's, SCR's, IGBT's ARE? And perhaps a nod
in the direction of where one can pick up the basics of what is
being talked about? My LT told me I had to help with the MRE's
because the cook was AWOL, and if I don't figure this out I'll be
SOL and my sub will be DOA.
Thanks,
Nuge
Subscuba@aol.com wrote:
At least, and a bridge is what I would go with. You would
probably have to parallel several in each leg of the bridge to
avoid dissipation problems.
There are a number of ICs on the market to do the drive
functions. I think ONSEMI has one. You would have to do the
power stages. Layout of the power stages are the bear.
I would suggest IXYS as a starting vendor for the FETs. I
think their site is "WWW.IXYS.com" they are not the only
vendor.
Ken Martindale
One other note on the price issue you brought up,
though. A
reversible speed controller requires a FET H bridge,
which means
twice the FETs. A forward only could be made for $5.00.
A good
reversible would easily hit $10.00.
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Dale A. Raby
Editor/Publisher
The Green Bay Web
http://www.thegreenbayweb.com
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