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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Dean,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> The Castle Creations brushless
speed controllers can be programmed to function in an “RPM control”
mode. The programming was pretty complex to get there, but the way I
understand the instruction sheet, it controls the juice to the motor to give
you a linear RPM based on throttle position. . . <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoAutoSig><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Keith L. Hoard<o:p></o:p></span></font></p>
<p class=MsoAutoSig><st1:place w:st="on"><st1:City w:st="on"><font size=2
color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Cordova</span></font></st1:City><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>, <st1:State
w:st="on">TN</st1:State></span></font></st1:place><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>khoard@midsouth.rr.com<o:p></o:p></span></font></p>
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style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Dean Pappas<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, September 20, 2004
11:52 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">discussion@nsrca.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Motor Costs
Comparison (more pro-electric)</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi John<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>No fuzzy logic! When the stick moves. something
deterministic should happen!<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I suspect that the existing ESC makers already have all the
hardware needed, as brushless brakes only require an intentionally retarded
commutation timing, while brushed motors require the additional shorting
transistors. But you can never have enough projects going at once ... eh?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We'll talk later,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dean<o:p></o:p></span></font></p>
</div>
</div>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <o:p></o:p></span></font></p>
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<p><font size=2 face="Times New Roman"><span style='font-size:10.0pt'>Dean
Pappas</span></font><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>Sr. Design Engineer</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>Kodeos Communications</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>111 Corporate Blvd.</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><st1:place w:st="on"><st1:City w:st="on"><font size=2><span
style='font-size:10.0pt'>South Plainfield</span></font></st1:City><font
size=2><span style='font-size:10.0pt'>, <st1:State w:st="on">N.J.</st1:State> <st1:PostalCode
w:st="on">07080</st1:PostalCode></span></font></st1:place><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>(908) 222-7817 phone</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>(908) 222-2392 fax</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <br>
</span></font><font size=2><span style='font-size:10.0pt'>d.pappas@kodeos.com</span></font><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <o:p></o:p></span></font></p>
<blockquote style='margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org]<b><span style='font-weight:bold'>On
Behalf Of </span></b>John Pavlick<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, September 17, 2004
9:19 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">discussion@nsrca.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Motor Costs
Comparison (more pro-electric)</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Dean & Matt,<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> Yes. I forgot to mention the the "programmability"
factor of an electric motor. Whereas a glow motor's characteristics come from
mechanical things (bore, stroke, port timing, etc.), an electric motor and
speed controller can work together to alter the torque curve. Some speed
controls take advantage of this now, but most people don't realize it. The
better speed controls use a non linear type of output (I'm oversimplifying
here) to make the electric motor "feel" more like a glow motor. I
haven't worked much with the brushless motors but I have a bit of experience
with the can motors (from R/C car racing). It seems like what we need is a
speed controller with a P.I.D. control loop. The currently available ones are
one dimensional / open loop. The throttle stick simply increases or decreases the
output of the motor. The speed controller just changes the PWM duty cycle in
direct response to the stick position. We need some feedback and Fuzzy Logic to
do this right. Dean: If you design the hardware, I'll work on the code...<o:p></o:p></span></font></p>
</div>
<div>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>John
Pavlick<o:p></o:p></span></font></p>
</div>
</blockquote>
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