Re: (ET) off topic but interesting...

["Tim Humphrey" <hump evgrin com>]

I'll agree. Further based upon the fact that the seller states that "this
device should NEVER be used to climb hills or accelerate"
-- 

Stay Charged!
Hump
"Whether you think you can or think you can't, you are right!" --Henry Ford

>
>
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of Robert 
> Adsett
> Sent: Monday, April 04, 2005 2:39 PM
> To: elec-trak cosmos phy tufts edu
> Subject: Re: (ET) off topic but interesting...
>
> At 02:17 PM 4/4/05 -0400, Chapin, Tim wrote:
>
>>This auction is on eBay currently.
>>http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=40155&item=71467
>>3
>>1105&rd=1&ssPageName=WDVW
>>
>>It talks about increasing the speed of you series wound golf cart motor.
>>It appears the kit is a solenoid some short cables, a switch to control
>>the solenoid and some wire for the switch....
>>
>>What is the guess on how this works?? Messing with the field on the
>>motor? Skipping the controller and giving a straight hook from the
>>batteries to the motor?
>
> At a guess, it's field weakening using the solenoid and power wiring as
> the
> shunt resistor.  That conclusion is reinforced by his exclusion of PM
> motors
> and the observation that MOSFET controllers get to 100% on and so don't
> benefit from a bypass contactor as SCR controllers do. Since it's not
> matched to the motor I'd expect operation to be hit and miss.  It might
> actually slow down some vehicles.
>
> Robert
>
> " 'Freedom' has no meaning of itself.  There are always restrictions,   
> be
> they legal, genetic, or physical.  If you don't believe me, try to chew a
> radio signal. "  -- Kelvin Throop, III http://www.aeolusdevelopment.com/
>
>
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