Re: Inpedance Protection of Ceiling Fan Motor

From: Tim Wescott (tim_at_wescottnospamdesign.com)
Date: 08/26/04 

Date: Wed, 25 Aug 2004 18:05:08 -0700

Doug Goncz wrote:

> Dear Joerg,
>
> You wrote:
>
>
>>From: Joerg notthisjoergsch@removethispacbell.net
>
>
>>If you only need 8W then a good bicycle generator plus inverter might
>>do.
>
>
> Yes, I know that. But I want to be able to put the mettle to the pedal. That
> is, I want to be able pull over while riding, extend the ESGE dual leg
> kickstand, which is braced to take the load of my weight, charge the
> ultracapacitors by pedaling at a heart rate of around 136, then fold the
> kickstand and continue.
>
> Oh. I didn't mention the ultracapacitors in this thread, did I?
>
> I have sixteen Maxwell Technologies PC 2500, 2700 F, 2.5 WVDC ultracapacitors
> rated 0.001 ohm series reistance. They can deliver 625 amps into a short.
>
> I plan to use six on the bike and have received three double boards from
> ExpressPCB.com. Each will hold a PB DPDT relay to put the caps in series or
> paralle, and an (a) LED to indicate state of charge. I have eight relays and
> six LEDs.
>
> I just haven't soldered them up yet.
>
> Google MOEPED for more. I already have a DC generator rated 30 VDC drive, 12 A
> stall as a motor. I have generated 50 W easily with it. In fact, the voltage on
> the caps rose so quickly I had to take it off line. Stopping wasn't an option,
> I was on a hill. We're talking big mobile energy here.
>
> Let's get back OT.
>
>
>>These actually live a long and
>>healthy life in such apps since they wouldn't be exposed to the huge
>>sideways pull of a belt.
>
>
> I know. I want to be able to power an abandonded house. And the vehicle has to
> be repaired in any bike shop in the world, or with standard parts like the
> ceiling fan motor, which has 17 mm bore single row sheilded ball bearings that
> can last thousands of hours, and are available easily. Just run with what I
> wrote, OK, everybody?
>
Lessee. 17mm bore single row shielded ball bearings, or an alternator
out of the nearest parked car. Hmm.

Y'know, I bet the alternator will be easier to find.
>
>>I have talked to a guy who had a few of
>>these in a river-based generator and they run day and night, since the
>>early 90's.
>
>
> Induction motors are even more reliable, and this is a military application. I
> intend to submit an unsolicited proposal to the US Army's Dual-Use Technology
> program.

For what? Bicycle shock troops?
>
> There isn't any running water on a bike to power the proposed paddlewheels.

His point was about reliability. Once you've reached sufficent
reliability, more is just waste.
>
> What is impedance protection, please, how does it work, and is it the factor
> that prevent this generator from working?

In order: we told you about one post in on this thread, we told you
about one post in on this thread, and no.
>
> Or is it not? Is there something else I need to do to get this generator
> online?

Yes, externally excite it with 60Hz, 120VAC. We told you that, too, in
your last thread. Once you get your inverter going you'll have enough
components that the MTBF of your assembly will be _much_ lower than the
alternator out of the nearest parked car.
>
> ftp://users.aol.com/DGoncz/Bicycle/ACMotorGenerator
>
> See it for yourself.
>
> It's not an electrically propelled bicycle. It's a mobile power station.

Somehow I think that the DOD is going to view gasoline for a motor as
being less expensive than C-rations for a 20-year-old. From a
watts/dollar standpoint it doesn't strike me as a winner.
>
> The motor running in the AVI files is just being used to tune the shifters and
> derailers by moving the pedals at a constant, reasonable rate while adjustments
> are made. That's a secondary benefit available wherever a plug is available.
>
>
> Yours,
> Doug Goncz ( ftp://users.aol.com/DGoncz/incoming )
> Student member SAE for one year.
> I love: Dona, Jeff, Kim, Mom, Neelix, Tasha, and Teri, alphabetically.
> I drive: A double-step Thunderbolt with 657% range. 

-- 
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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