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<DIV><FONT size=2 face=Arial>Joe,</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I have to plead ignorance on the BLDC motor.
I'm guessing it's some kind of permanent magnet field DC motor...
Correct? Typically they are smaller in diameter then a wound field
type. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>For my rear thruster I got the last of the three
horsepower motors George had. So my rear thruster in pretty much as the
plans show. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>My side thrusters are even a bit larger then the
plans since I found two 3/4 HP brush type, 36 volt motors for very cheep in a
surplus close out. I built around them but similar to the plans.
</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>To get props for them I called Michigan Wheel
and gave them my HP and RPMs and a description of my sub. They
recommended the props and sold them to me. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>When I was doing my wet testing, I put a amp meter
in the motor power line and found the side thrusters were fine but the rear
thruster was drawing a little to many amps. A little hand grinding to
reduce the area of the prop blades brought the amperage down to the max
rating for the motor. I don't know if that the best way, but it worked for
me. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Now if your thinking of building a true Kort nozzle
your definitely going to have to do some experimenting. Even the prop
guards as called out on the plans effect the prop efficiency and so also the
motor load. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>You may be better off to find your motors then
figure out what you can attach to them, open prop, shrouded prop or Kort
nozzle. Anything will move the sub. I have a total of 4.5 HP and I
don't know if I could control any more power as the sub gets squirrelly when
trying to travel fast. When submerged, the side thruster are almost all
that's needed.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Dan H.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=josephperkel@yahoo.com href="mailto:josephperkel@yahoo.com">Joe
Perkel</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, October 16, 2013 2:08
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [PSUBS-MAILIST] DC Systems
Primer</DIV>
<DIV><BR></DIV>
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<TD vAlign=top>Dan,<BR><BR>What I was hoping to find was BLDC motors
matching 36v 1800 - 3600 rpm, 1/2 to 2 hp range. They don't seem to be
out there.<BR><BR>I have matched up brushed motors with those specs at
both Baldor and Leeson with the appropriate face plates. But, then we
are back to the same large / heavy motors at least there in the $500
range.<BR><BR>You have the standard motors on Persistence, what are the
size and pitch of the respective props?<BR><BR>I'm going to just have to
suck it up and draw these up with new Kort
nozzles.<BR><BR>Thanks!<BR><BR>Joe<BR><BR>Sent from Yahoo! Mail for
iPad</TD></TR></TBODY></TABLE>
<DIV id=_origMsg_>
<DIV><BR>
<DIV>
<DIV style="FONT-SIZE: 0.9em">
<HR SIZE=1>
<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN> </B>Dan H.
<jumachine@comcast.net>; <BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN> </B>Personal Submersibles General
Discussion <personal_submersibles@psubs.org>; <BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN> </B>Re: [PSUBS-MAILIST] DC Systems
Primer <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN> </B>Wed, Oct 16,
2013 1:48:13 PM <BR></DIV><BR>
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<TD vAlign=top>
<DIV><FONT size=2 face=Arial>Those high voltage DC motors are designed
for variable speed drives where the power is first line voltage AC then
converted to DC through a motor controller for accurate motor speeds and
torque. They aren't practical for a battery powered
system.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>For battery powered systems your probably
better off to stick to the lower voltage motors. With an inverter
I guess you could convert the battery power to high voltage AC then
convert it to DC, but I'm pretty sure you'd find it
impractical with the extra equipment. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>It's hard to beat golf cart
controllers for speed regulation and there's tons of them out
there. Battery powered floor scrubbers use a variety of DC motors
too. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Dan H.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV id=yqt73347 class=yqt5283399738>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="FONT: 10pt arial; BACKGROUND: #e4e4e4"><B>From:</B> <A
title=josephperkel@yahoo.com href="javascript:return" shape=rect
rel=nofollow target=_blank ymailto="mailto:josephperkel@yahoo.com">Joe
Perkel</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=personal_submersibles@psubs.org href="javascript:return"
shape=rect rel=nofollow target=_blank
ymailto="mailto:personal_submersibles@psubs.org">Psubbers Mailist</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, October 15, 2013
11:02 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [PSUBS-MAILIST] DC
Systems Primer</DIV>
<DIV><BR clear=none></DIV>
<DIV
style="BACKGROUND-COLOR: #fff; FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: #000; FONT-SIZE: 12pt">
<DIV id=yiv7646271124>
<DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); FONT-FAMILY: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 12pt">
<DIV id=yiv7646271124yui_3_13_0_rc_1_1_1381888951465_3254>Since my
Navy "A" school is some 30+ years ago, I need a little help in trying
to understand and match up something close to Georges motors.
What I dont understand is why is there such an array of DC motors in
the 1 - 3 hp range with wildly varing input voltages?</DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_18> </DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_19>If you notice
those Tecnadyne thrusters have stupendous input voltages up to 330vdc.
I dont understand why and need a primer on DC systems for this
application. Can anyone point me to one?</DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_1_1381888951465_3278> </DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_7>What
I'm trying to do is to slim down the housing, get more
bollard thrust from the prop by adding a real kort nozzle, and
use a mag coupling instead of a shaft seal, all else remaining
essentially the same.</DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_9> </DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_10>I want to slim
down Georges T-Rex cans with similar power specs, but new and improved
components, keeping the items conducive to homebuilding, like the
housings and mountings, electrical penetrators, shaft seals if I cant
do mag couplings. </DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_15> </DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_16>What
I've found so far <A
id=yiv7646271124yui_3_13_0_rc_1_1_1381888951465_3384
href="http://www.baldor.com/support/literature_load.asp?LitNumber=FL1210"
shape=rect rel=nofollow
target=_blank>http://www.baldor.com/support/literature_load.asp?LitNumber=FL1210</A>
fractional hp and up to 3 hp @ 1800 rpm but, here again @ 320vdc
!?</DIV>
<DIV> </DIV>
<DIV>Whats attractive about this one is the dimensions, 6.5" on the
mounting flange would fit quite nicely in the 6 nom SCH40 pipe
which is 6.625"</DIV>
<DIV> </DIV>
<DIV>But I dont know what im doing with regard to the input
voltage / output power / torque relationship and how to match
this all up correctly. All Ive confirmed so far is that Georges
motors were TENV (totally enclosed non-ventilated), 36vdc @ 1800 to
3600 rpm for 1/2 and 3 hp respectively.</DIV>
<DIV> </DIV>
<DIV>Joe</DIV>
<DIV id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_12> </DIV>
<DIV
id=yiv7646271124yui_3_13_0_rc_1_7_1381888951465_13> </DIV></DIV></DIV></DIV></DIV></DIV>
<P></P>
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