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*To*: tesla@xxxxxxxxxx*Subject*: RE: 3 phase converting*From*: "Tesla list" <tesla@xxxxxxxxxx>*Date*: Sat, 22 Jan 2005 10:13:55 -0700*Delivered-to*: testla@pupman.com*Delivered-to*: tesla@pupman.com*Old-return-path*: <teslalist@twfpowerelectronics.com>*Resent-date*: Sat, 22 Jan 2005 10:17:38 -0700 (MST)*Resent-from*: tesla@xxxxxxxxxx*Resent-message-id*: <xO-7UD.A.KpF.yqo8BB@poodle>*Resent-sender*: tesla-request@xxxxxxxxxx

Original poster: Harvey Norris <harvich@xxxxxxxxx>

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

> However, say you have two coils and you want the > phase of the current > through one to be 90 degrees away from the phase of > the other. Could you > not just put an appropriate capacitor in series with > the one coil. Say > that the coils have an impedance of R+jX.. > > Make sure that R = X... > > You'd put a capacitor of impedance -j2X in series, > so one leg would have > impedance R+jX and the other would have impedance > R-jX. Since R=X, the > current through one coil will be lagging the voltage > by 45 deg, and the > current through the coil with the capacitor will be > leading by 45 deg, > hence 90 degrees apart. > > If the inductance is large compared to the > resistance, then a capacitor of > just -jX should work. If R<<X, then current through > one coil is 90 degrees > lagging, and the current through the other coil will > be in phase. > > If you want balanced currents, you might need to > fiddle a bit with Ls and > Cs to get the phases and amplitudes right. In the case where the reactance is cancelled by -jX, there will be a voltage rise given by the acting q factor. To obtain equal currents on both coils it would be necessary for the reactive side to be inputed from a transformer that delivered a voltage equivalent to that made by the resonant side. Hence the reactive side becomes very innefficient compared to the resonant, as it takes q times more amperage on that branch to accomplish the same amount of magnetic flux. HDN

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