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<DIV><FONT face=Arial size=2>Bob:</FONT></DIV>
<DIV><FONT face=Arial size=2>The faster the prop turns in a freewheeling mode,
the more braking effect, so the less load on it from expending energy into a
load, the faster it will turn. When you have an electrical generator being
propelled by some force and the voltage generated from the windings is not
connected to an external load, then no current other than eddy currents is going
to flow in the motor, which ought to be fairly insignificant. So there is
an EMF, but no significant power generated by the motor windings when being
driven by an external mechanical force when there is an incomplete
circuit from the windings into any external electrical load. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=bob@toprudder.com href="mailto:bob@toprudder.com">Bob Richards</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, February 19, 2006 9:29
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Electric
vs. Glow</DIV>
<DIV><BR></DIV>
<DIV>Maybe I'm not understanding what you are saying. Regenerative braking
would cause less downline braking than a freewheeling motor?</DIV>
<DIV> </DIV>
<DIV>If you are comparing regenerative braking with non-regenerative braking,
I would think the motor would heat less, since with non-regenerative braking
the motor windings ARE the load, are they not?</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>Ed Alt <ed_alt@hotmail.com></I></B> wrote:</DIV>
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<DIV><FONT face=Arial size=2>Also, though it's a great thing if it can be
implemented well, regenerative braking will contribute to heating of
the motor and it may actually reduce the downline braking effect
somewhat. If you don't dissipate the energy into a load, the motor
will spin at a higher RPM while windmilling, effectively incr! easing the
disc area and allowing it to cool a little bit on downlines. Re
heating, when a load is applied (the battery under charge in this
case), the voltage generated by the motor windings now results in a fairly
significant current flow (no, or very little flow happens without the
charge path closed). This will result in electrical power being
dissipated in the windings, therefore heating will occur on a downline, not
cooling. Also, since the battery is already running warm, it may not
be very good for it to get these brief and relatively large charging
currents. Not sure how bad that effect may be, but it's got to get
evaluated by a battey expert. Sure would be good to solve the problem
and keep everything within safe parameters though.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
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