Re: Twin coils - PSpice model development

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz <teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

Tesla list wrote:

 > Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz 
<teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>

 > The circuit described above oscillates at 4 frequencies if the
 > secondaries
 > are disconnected (no spark) and at 3 frequencies when they are
 > interconnected by a short-circuit (ideal spark). If the system is tuned,
 > cancellations shall reduce the oscillation frequencies to 2 and 1,
 > respectively.

Correction: 3 frequencies without spark, 2 with spark. If the tuning
is perfect and the primary gap doesn't quench, 2 frequencies with
sparks,
one with spark.

Example:

Perfect tuning:
Primary capacitor: 10 nF
Primary inductors: 45 uH
Secondary inductances: 30 mH
Secondary capacitances: 30 pF
k=0.10497 in both transformers. Mode 9:10.

Without spark: resonances in 159.6 kHz and 177.3 kHz.
With spark: resonance in 168.7 kHz (Primary voltage only.
The secondary voltages are null).

Mistuned: One of the coupling coefficients changed to 0.2, and the
corresponding capacitance changed to 20 pF:
Without spark: 160.1 kHz, 172.4 kHz, 211.5 kHz
The voltage over the changed capacitor looks all wrong, and the
energy transfer is incomplete.
With spark: resonances in 168.7 kHz and 185.1 kHz.

Antonio Carlos M. de Queiroz