Re: no-man's-land genset trailer

["Peter VanDerWal" <peterv@peoplepc.com>]

A bridge rectifier on single phase AC creates a pulsating DC.  Current only
flows when the voltage rises above the battery voltage.  (warning crude
ASCII art)

Voltage wave form

    ^        ^
---/-\------/-\----------------------------  Battery Voltage
  /   \    /   \
 /     \  /     \
/       \/       \


Current wave form

    ^       ^
   / \     / \
   | |     | |
___| |_____| |__


The spiky current wave form doesn't match the voltage waveform (hence poor
power factor).

With three phase, because of the way the phases interact, when you rectify
it with a 6 diode bridge you get pure DC out.  Pure DC voltage, pure DC
current and both current and voltage are perfectly in phase.


> Who says there are no power factor control problems with
> three phase?   Tell us more about that.
>
> Tom Shay
>
> ----- Original Message -----
> From: "VanDerWal, Peter MSgt" <vanderwp@fhu.disa.mil>
> To: "'EV List'" <ev@listproc.sjsu.edu>
> Sent: Friday, July 26, 2002 2:26 PM
> Subject: Re: no-man's-land genset trailer
>
>
> (stuff snipped out)
>
> > Or save the cost of the PFC charge and buy a three phase 10kw generator
> for
> > $3700 and just use a 6way bridge (no PFC problems with three phase).
10kw
> > (approx 80 amps) will almost let you drive continuously. 350lbs and it
> says
> > it's "Super Quite".
> > http://www.electricpowergenerator.com/threephase.html
> >
> >
>
>