inverter generators
in [Design]
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From: Tim Williams on 23 Jun 2010 11:34 "Josepi" <J.R.M.(a)invaliid.con> wrote in message news:5DeUn.64970$h57.17630(a)newsfe22.iad... > ooops > Electrostatic charges are DC! And magnetic charges aren't? Tell me, can you make a continuous (i.e. DC) electrostatic charge without oscillating components? Can you make a continuous electromagnetic charge without parts oscillating (homopolar aside)? I thought not :) > When they discharge the electron "inertia" usually makes them overshoot the > equalibrium and then over shoot back giving an AC with high frequencies and > lots of RFI. > > ready for the RFI coming? No, RFI has nothing to do with it. All electrostatic generators require charge transfer, e.g. brushes, spark gaps, etc. These act in the same manner as a commutator. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Tim Williams on 23 Jun 2010 11:37 "Jim Wilkins" <kb1dal(a)gmail.com> wrote in message news:a8ad1edc-dc87-468c-b6a5-2b843b255597(a)y13g2000yqa.googlegroups.com... > A Wimshurst machine generates DC from a rotor without a commutator. Ah, but it has brushes. If it didn't need commutation, it wouldn't need a segmented rotor either -- same purpose. As far as I know, the homopolar generator is the ONLY generator with a rotating construction, contiguous rotor and DC output. It's trivial to make DC from a linear motor (cf. railgun), of course, but reality doesn't allow you infinite rails or magnets. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Josepi on 23 Jun 2010 12:09 RFI count: 1 "Tim Williams" <tmoranwms(a)charter.net> wrote in message news:jQpUn.108468$_84.75845(a)newsfe18.iad... And magnetic charges aren't? Tell me, can you make a continuous (i.e. DC) electrostatic charge without oscillating components? Can you make a continuous electromagnetic charge without parts oscillating (homopolar aside)? I thought not :) No, RFI has nothing to do with it. All electrostatic generators require charge transfer, e.g. brushes, spark gaps, etc. These act in the same manner as a commutator. Tim
From: Josepi on 23 Jun 2010 12:23 There is **no** commutation (as Jim stated) and no polarity change. Brushes do not make commutation. It generates a DC charge. Here, I'll make it a little easier for you to look it up. http://en.wikipedia.org/wiki/Wimshurst_machine "Tim Williams" <tmoranwms(a)charter.net> wrote in message news:mTpUn.108469$_84.92116(a)newsfe18.iad... Ah, but it has brushes. If it didn't need commutation, it wouldn't need a segmented rotor either -- same purpose. As far as I know, the homopolar generator is the ONLY generator with a rotating construction, contiguous rotor and DC output. It's trivial to make DC from a linear motor (cf. railgun), of course, but reality doesn't allow you infinite rails or magnets. Tim -- "Jim Wilkins" <kb1dal(a)gmail.com> wrote in message news:a8ad1edc-dc87-468c-b6a5-2b843b255597(a)y13g2000yqa.googlegroups.com... > A Wimshurst machine generates DC from a rotor without a commutator.
From: JosephKK on 24 Jun 2010 08:04
On Tue, 22 Jun 2010 14:03:05 -0500, "Tim Williams" <tmoranwms(a)charter.net> wrote: >"Joel Koltner" <zapwireDASHgroups(a)yahoo.com> wrote in message news:mI6Un.465228$Vq1.178539(a)en-nntp-03.dc1.easynews.com... >> And I'd like him to find me the transformer in a ceiling fan ... or find >> a PC that doesn't use a "power transformer" in its power supply: >> >> "If you have equipment that can deal with these pseudo-sine waves, that's >> the way to go as they are very efficient. Most electronics have no problem >> with this, as they take the line and make it into DC right away anyway. >> Like a compact fluorescent bulb, or a PC. But some appliances have a >> problem with this, in particular anything with a power transformer in it, >> like an older microwave oven or stereo amp or fluorescent tube fixture or >> ceiling fan." > >Transformer, as in, line voltage goes to a winding around a core. SMPS don't have a transformer at the input, >they have a bunch of stuff inbetween. Physically, motors are just as transformery as transformers, though it's >certainly a misnomer to be calling them such! No Tim; only induction motors are transformers, synchronous motors and brush motors are not like a transformer at all. > >Someone should make incredibly cheap VFDs suitable for running shaded pole type motors and legacy transformerized >equipment, then convert the entire house to DC. Way better power factor for all those SMPS's... How about redesigning refrigerators and household AC and heat pumps around VFDs? Let's start where there is some efficiency reward for the extra design work > >...Of course, then your 120/240V switchable supplies all croak, which is still most computers. > >Tim |