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

Re: Maximum voltage of a toroid



Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:

Original poster: "Derek Woodroffe" <tesla@xxxxxxxxxxxxxxx>

 >A table listing breakdown voltages (kV) for several toroids with major
radius R and minor radius r:
r/R   0.050   0.100   0.150   0.200   0.250   0.300   0.350   0.400   0.450
V/R  639.43  998.45 1261.10 1470.00 1644.57 1795.52 1929.30 2050.02 2160.33
 >Using the geometrical mean between r and R as the effective radius of an
equivalent sphere, reasonable values are found:
r/R   0.050   0.100   0.150   0.200   0.250   0.300   0.350   0.400   0.450
V/R  670.82  948.68 1161.90 1341.64 1500.00 1643.17 1774.82 1897.37 2012.46

So from the above then (excuse my poor maths)
V(kv)=3*exp( ( log(R)+log(r) ) /2 ) where R & r are in mm, is a better
approximation?

What I used was V = 3000*sqrt(r*R). Same thing. It's easy to find a better approximation.

Antonio Carlos M. de Queiroz