-----Original Message-----
From: Michel Jullian
(should be _Harry_ Paul Sprain according to the US 6954019 patent
document, not
Henry, I have corrected the subject line and added "overunity disputed"
to make
the thread look more appealing to our fellow Vorts)
TB: Ackshully "Hairy" would be more apropos. BTW, "overunity disputed"
is somewhat redundant as this is always the case. :-)
MJ: Thanks Terry for your objective introduction of my position, in
spite of your
not agreing with it and of the big dollars at stake. The documents I
will refer
to are in the public file folders you gave us a link to:
http://mysite.verizon.net/vzesfls5/files/
1/ The coil's DC resistance argument you reported was inspired to me by
the
rough "sanity check" Ohm's law prediction of coil current at page 5 of
the
"Sprain Motor Early Analysis by Independent Lab" pdf document. The
damped
oscillation current trace in CH2 of the "Sprain Motor electric drive
pulse
waveform photo (BMP)" oscillogram, of which we see more than a
half-period,
clearly converges to ~2 divisions. This suggests that 2 divisions on
the
oscillogram scale to 20A (steady state current of a ~1 ohm static
resistance
coil driven by 20VDC) rather than 2A as claimed.
TB: Yes, but your cognitive dissonance is not allowing you to see that
there is a large reverse electromotive force caused by the approaching
rotor magnet which must be overcome by the power supply. You also
acknowledged that the power supply display shows a RMS current of less
than 0.06 A, from a video that is no longer publicly available.
MJ: 2/ I have a second argument pointing to the same conclusion: the
voltage drop of
the coil driving FET, which Terry told me was of the IRF250 family, is
of at
least 1V as can be seen on the oscillogram (CH1). I remember Jonfli on
this list
noted that 1V drop was a lot for the claimed low current of 2A, and
might be
improved by using a FET with a lower ON resistance. I looked up the
IRF250 ON
resistance (RDSon) and found it is in fact quite low already, 0.085
ohms max,
which requires more than 10A to yield the observed 1V voltage drop
(Ohm's law
again). This suggests that coil current is at least 5 times the claimed
value of
2A.
TB: You also refuse to accept that I have data which shows that there
is a 5 V drop between the drain and source of the gating circuit
indicating that the field effect transistor is operating in the linear
region and is unsaturated. This data is not public; but, I will get
permission to send it to anyone who cares to see it.
MJ: My conclusion from 1/ and 2/ is that the Sprain motor's COP,
claimed to be
overunity ~2, is in fact possibly 10 times and at least five times
lower than
that i.e. well below unity, due to an erroneous scaling of the input
current
waveform. I have no explanation as to the source of the error though.
TB: And I certainly understand your position regardless of your
refusal to accept the data. The inventor has actually operated the
motor on a 14.5 volt supply without the FET in the circuit. The back
EMF is at least 8 V when triggered as indicated by the referenced data,
which all refutes your position. In addition, if 20 A at 20 V were
being input to the coil, I could feel the warmth of the coil with a 400
W input even at a duty cycle of 3.7%. I feel no such warmth (from the
coil).
What you do not understand is that we repealed Ohm's law here in
Georgia in 1966. As a result we have saved a fortune on power costs.
Near the same time we rounded pi to exactly 3.0 which attracted many
students to study architecture at our universities.
Despite the s(c)eptics, we continue to try to get the motor to
self-run. The 3 phase alternator that Jones found on the web is only
50% efficient at 90 RPM. Paul has eliminated the FET from the circuit
by using it to gate a second coil which closes a magnetic reed switch
to gate the motor coil. This drops the voltage to a level near the
alternator output.
Because the potential customer is coming tomorrow, I have asked Paul to
put the torque sensor back in place (removing the alternator) for the
demonstration; however, efforts to make it self-run will continue
afterward.
Terry
