[Prev][Next][Index][Thread]

Re: Beating Solved


I second that.
Barry

 ----------
|From: "tesla-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|To: Benson Barry; "Tesla-list-subscribers-at-poodle.pupman-dot-com"-at-PMDF-at-PAXMB1
|Subject: Re: Beating Solved
|Date: Friday, September 27, 1996 4:20AM
|
|<<File Attachment: 00000000.TXT>>
|> > Subject: Re: Beating Solved
|> Subject: Re: Beating Solved
|> > Subject: Re: Beating Solved
|
|From sgreiner-at-mail.wwnet-dot-comThu Sep 26 21:44:38 1996
|Date: Thu, 26 Sep 1996 09:21:25 -0700
|From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
|To: tesla-at-pupman-dot-com
|Subject: Re: Beating Solved
|
|Tesla List wrote:
|>
|> > Subject: Re: Beating Solved
|>
|> >From bturner-at-apc-dot-netMon Sep 23 22:18:46 1996
|> Date: Mon, 23 Sep 1996 12:02:09 -0700
|> From: open_minded <bturner-at-apc-dot-net>
|> To: tesla-at-pupman-dot-com
|> Subject: Re: Beating Solved
|>
|> Tesla List wrote:
|> >
|> > >From sgreiner-at-mail.wwnet-dot-comSat Sep 21 12:10:53 1996
|> > Date: Fri, 20 Sep 1996 16:46:09 -0700
|> > From: Skip Greiner <sgreiner-at-mail.wwnet-dot-com>
|> > To: tesla-at-pupman-dot-com
|> > Subject: Re: Beating Solved
|> >
|> > Tesla List wrote:
|> > <SNIP>
|> > > Bert (and the gang) -
|>
|> <SNIP>
|>
|> >
|> > Beautiful pics Brent. One question...How many breaks per each half 
cycle
|> > of the mains does your synchronous break do.
|> >
|> > Thanks
|> > Skip
|>
|> It's an 8-electrode, 1800-RPM sync. gap. I get 240 BPS out of it as it
|> sits, so that's 4 breaks per single AC cycle, or 2 per half cycle. BTW -
|> I just calculated out the dwell time, and I get about 40 uS, which
|> is a bit too long. Details from the Corum Brothers suggest that I will
|> do better with about a 20uS dwell, which I will get when I switch over
|> to a 3600-RPM sync. motor. Will boost the BPS to 480 as well. Hopefully
|> I'll get a bit hotter spark out of it!
|>
|> - Brent (...tuning for maximum smoke...)
|
|Brent
|Several questions which I hope don't bore you and others
|
|1. Have you ever tried to use only 1 break per half cycle?
|
|2. Do you phase the break points with the AC, ie., do you adjust the
|break rotor with respect to the rotor shaft to place the break points at
|a particular point in the AC cycle?
|
|I have found at the 1 and 2 kva levels that I run that a single break
|per half cycle at synchronous speed placed just before the peak is
|extremely efficient. At my lower powers dwell time is not an issue since
|the capacitor is pretty well discharged during its one chance. I have
|tried 1, 2, 3, and 4 breaks per half cycle and have achieved the best
|efficiency at 1 break per half cycle. I have varied the dwell time by
|using smaller and larger contacts and both 1800 and 3600 rpm motors with
|little change when set up as above.
|
|Please publish your results at reduced dwell times and larger number of
|breaks. It should help to better define the problems of runnung at
|synchronous motor speeds.
|
|Thanks
|
|Skip
|