3 phase from func.gen. IC
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From: Paul Hovnanian P.E. on 16 Mar 2010 22:39 Kevin Lang wrote: > > What would be the simplest way to derive a simultaneous three phase > output from a sine wave produced by a single function generator IC ... > that does not change as the frequency is varied? > > Specifically, two additional sinewaves remaining 120 and 240 degrees > out of phase with the original as the frequency is varied between > 100Hz and 1KHz. > > Kevin Lang Google "Scott Tee Transformer" and then figure out how to generate a sine wave in quadrature to the reference. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ definition: recursion; see recursion.
From: Don Lancaster on 17 Mar 2010 00:01 Paul Hovnanian P.E. wrote: > Kevin Lang wrote: >> What would be the simplest way to derive a simultaneous three phase >> output from a sine wave produced by a single function generator IC ... >> that does not change as the frequency is varied? >> >> Specifically, two additional sinewaves remaining 120 and 240 degrees >> out of phase with the original as the frequency is varied between >> 100Hz and 1KHz. >> >> Kevin Lang > > Google "Scott Tee Transformer" and then figure out how to generate a > sine wave in quadrature to the reference. > http://www.tinaja.com/magsn01.asp -- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don(a)tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
From: VWWall on 17 Mar 2010 01:10 Paul Hovnanian P.E. wrote: > Kevin Lang wrote: >> What would be the simplest way to derive a simultaneous three phase >> output from a sine wave produced by a single function generator IC ... >> that does not change as the frequency is varied? >> >> Specifically, two additional sinewaves remaining 120 and 240 degrees >> out of phase with the original as the frequency is varied between >> 100Hz and 1KHz. >> >> Kevin Lang > > Google "Scott Tee Transformer" and then figure out how to generate a > sine wave in quadrature to the reference. > From my reply in the same thread,3/11/2010 03:03PM: "Once you've got two sine waves in quadrature, getting three phase is simple. Just use a Scott-T transformer. These were once used for power applications, but since two phase power is almost extinct, they are now used for connecting servos that use synchros to those with resolvers." http://en.wikipedia.org/wiki/Scott-T_transformer Glad to see another old time power guy! :-) -- VWWall, P.E.
From: John Fields on 17 Mar 2010 17:13 On Mon, 15 Mar 2010 19:48:19 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Mon, 15 Mar 2010 22:33:27 -0500, Jamie ><jamie_ka1lpa_not_valid_after_ka1lpa_(a)charter.net> wrote:>>> >>My my, what vulgarity out of a prestige young man, like yourself. --- 72 and counting...;) --- >Yes, he and JT are unusually vulgar today. I figure they were cuddling >for warmth and the shawl fell off their knees. --- Typical kinda response from Larkin. He says something dopey, I correct him, he calls me a PITA for being a whistle-blower, Jim calls him prissy, and then he likens us to old hens/women/whatever, in order to buy time, hoping everyone will forget the mistake and buy the accusations which falsely discredit his criticizers. What a schlemiel! JF
From: John Fields on 17 Mar 2010 17:37
>Yes, he and JT are unusually vulgar today. I figure they were cuddling >for warmth and the shawl fell off their knees. --- Geez, John, one of us finding you wrong and the other agreeing with that finding doesn't represent "cuddling" in my book, just statement of, and agreement on, objective fact. Of course being found wrong is "mea maxima culpa" when viewed through your deranged set of values and can't be allowed to coexist with what you hold precious; your infallibility, Mr. "Infinity only means something very large.", so you'll try to do whatever you can to fool all of the people all of the time even though all you do is fool yourself since you think you've gotten everyone to goose-step along with you. JF |