<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Met Troy when he was in Auckland a few years back, </div><div>as did Hugh. Nice guy, let me hop in his Triton 3000.</div><div>As said, motor magnets can loose their magnetism over time & </div><div>especially if they get too hot; which is more of a prospect when </div><div>you are enclosing it in a can as we do. This could make it under perform.</div><div>You are not diving in Florida so you have the cold water on your side.</div><div><br></div><div><br>Sent from my iPad</div><div><br>On 28/04/2016, at 9:23 am, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div><span>Alan,</span></div><div dir="ltr"><span>Troy at Triton Submarines told me it should be 1750 rpm. If I put 48v to it I get about 1400 rpm. Maybe I should take one to the lake and try it.</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1461792038990_6159"><span>Hank</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Wednesday, April 27, 2016 1:53 PM, Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv9647400897"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4175"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4176">Hank,</span></div><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4170"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4169">where are you getting the 1750 rpm figure from?</span></div><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4172"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4173">If the 1750 is the name plate rpm on the motor, that would be the no load rpm</span></div><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4168"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4179">without the prop. If you are getting 1050 rpm off 36V, that is a kv value (rpm per Volt)</span></div><div dir="ltr"><span>of 30. If you divide 1750 rpm by 30 you get 58V as the motor voltage, but that was when the</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4279"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4278">motor was new; various things like bearings & de-magnetizing of the magnets will effect that.</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4252"><span id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4280">I would say (if 1750 is the rated motor rpm) that 36V would be in the ball park.</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4277"><span>Alan</span></div><div class="yiv9647400897qtdSeparateBR" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4160"><br clear="none"><br clear="none"></div><div class="yiv9647400897yahoo_quoted" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4159" style="display:block;"> <div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4158" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4157" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9647400897yqt3775479681" id="yiv9647400897yqt77569"><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4156"> <font id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4162" face="Arial" size="2"> </font><hr id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4161" size="1"> <b><span style="font-weight:bold;">From:</span></b> hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none"> <b><span style="font-weight:bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br clear="none"> <b><span style="font-weight:bold;">Sent:</span></b> Thursday, April 28, 2016 5:28 AM<br clear="none"> <b><span style="font-weight:bold;">Subject:</span></b> Re: [PSUBS-MAILIST] power converter<br clear="none"> </div> <div class="yiv9647400897y_msg_container" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4281"><br clear="none"><div id="yiv9647400897"><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4288"><div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4287" style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div id="yiv9647400897yui_3_16_0_ym19_1_1461777926970_3188"><span>Hi Kieth,</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461777926970_3187"><span id="yiv9647400897yui_3_16_0_ym19_1_1461777926970_3186">I just tested the motor with 36v and I am only getting 1050 rpm instead of 1750 rpm. This make me think the motors are not original to the 14 series Perry. I might be right back where I started. What is a voltage doubler circuit? sounds interesting.</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461777926970_3187"><span>Hank</span></div> <div class="yiv9647400897qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv9647400897yahoo_quoted" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4286" style="display:block;"> <div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4285" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4284" style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div class="yiv9647400897yqt3986072968" id="yiv9647400897yqt21975"><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4283"><font id="yiv9647400897yui_3_16_0_ym19_1_1461785156640_4282" face="Arial" size="2"> On Wednesday, April 27, 2016 11:06 AM, k6fee via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv9647400897y_msg_container"><div id="yiv9647400897"><div><div>Hank,</div><div><br clear="none"></div><div>You would still need to turn the AC back to DC with a rectifier and remove the DC ripple with a capacitor. I had a thought about trying a voltage doubler circuit instead of an inverter, but it sounds like you have come up with a solution with the replacement motors.</div><div><br clear="none"></div><div>Keith T.</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="yiv9647400897composer_signature"><div style="color:rgb(87, 87, 87);font-size:85%;">Sent from my Verizon, Samsung Galaxy smartphone</div></div><div><br clear="none"></div><div class="yiv9647400897yqt1667406935" id="yiv9647400897yqt91433"><div style="color:rgb(0, 0, 0);font-size:100%;"><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Date: 4/27/16 5:24 AM (GMT-08:00) </div><div>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] power converter </div><div><br clear="none"></div></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div id="yiv9647400897yui_3_16_0_ym19_1_1461759558384_3436"><span>Hi Kieth,</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461759558384_3290"><span id="yiv9647400897yui_3_16_0_ym19_1_1461759558384_3502">If I use my 3,000W inverter do I not need a rectifier? could I still reverse them? </span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461759558384_3290"><span>Thank you</span></div><div dir="ltr" id="yiv9647400897yui_3_16_0_ym19_1_1461759558384_3290"><span>Hank</span></div> <div class="yiv9647400897qtdSeparateBR"><br clear="none"><br clear="none"></div><div class="yiv9647400897yahoo_quoted" style="display:block;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"> <div dir="ltr"><font face="Arial" size="2"> On Tuesday, April 26, 2016 9:48 PM, k6fee via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> <div class="yiv9647400897y_msg_container"><div id="yiv9647400897"><div><div>Most inverters these days are 90 - 98% efficient at converting </div><div>DC to AC. You would only need a 100,000 mfd cap to handle smoothing the DC ripple to acceptable levels to 50 amps and they rarely go south (fingers crossed) in my experience.</div><div><br clear="none"></div><div>With that said having 120vdc direct from a battery bank is the preferred option.</div><div><br clear="none"></div><div>Keith T.</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div id="yiv9647400897composer_signature"><div style="color:rgb(87, 87, 87);font-size:85%;">Sent from my Verizon, Samsung Galaxy smartphone</div></div><div><br clear="none"></div><div class="yiv9647400897yqt1287797875" id="yiv9647400897yqt69508"><div style="color:rgb(0, 0, 0);font-size:100%;"><div>-------- Original message --------</div><div>From: Stephen Fordyce via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Date: 4/26/16 7:45 PM (GMT-08:00) </div><div>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] power converter </div><div><br clear="none"></div></div><div dir="ltr"><div>Hi guys,</div><div>Getting it to AC should be more straightforward in terms of being able to get a standard product, but still needs a pretty big/expensive inverter. The DC rectifier could work but again for the currents involved the capacitors required for a smooth output would have to be huge, and it's another significant exercise/stuff to go wrong. Plus it's probably all quite inefficient (I wouldn't be surprised if you lost 20% of the electrical energy just through the conversion).</div><div><br clear="none"></div><div>Cheers,</div><div>Steve</div><div><br clear="none"></div><div><br clear="none"></div></div><div class="yiv9647400897gmail_extra"><br clear="none"><div class="yiv9647400897gmail_quote">On Wed, Apr 27, 2016 at 12:18 PM, k6fee via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv9647400897gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204, 204, 204);border-left-width:1px;border-left-style:solid;"><div><div>Another option is to use an off the shelf 48v to 120v ac inverter then use a bridge rectifier to take it back to DC. To get away from a cooling fan the heat sink could be mounted to the hull to dissipate the heat and make it quiet.</div><span></span><div><br clear="none"></div><div>Keith T.</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><div style="color:rgb(87, 87, 87);font-size:85%;">Sent from my Verizon, Samsung Galaxy smartphone</div></div><div><br clear="none"></div><div style="color:rgb(0, 0, 0);font-size:100%;"><span></span><div>-------- Original message --------</div><div>From: Stephen Fordyce via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div><div class="yiv9647400897h5"><div>Date: 4/26/16 6:30 PM (GMT-08:00) </div><div>To: Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: Re: [PSUBS-MAILIST] power converter </div><div><br clear="none"></div></div></div></div><div><div class="yiv9647400897h5"><div dir="ltr"><div>Hi Hank,</div><div>I've dabbled a little bit in (small!) DC converters and my guess is that a converter that will do the current you're after will be expensive/large/complex and probably generate a significant amount of heat. Also seems like an obscure set of operating conditions that will be hard to find off the shelf. </div><div><br clear="none"></div><div>You've probably thought about it, but splitting the battery bank and rewiring part of it to supply 120VDC is probably the easiest low-tech solution if you have enough cells to put in series and achieve the higher voltage. You would get some nice redundancy there too if you have 2 battery banks controlling different thruster sets.</div><div><br clear="none"></div><div>As an aside, I suspect 48VDC is pretty lethal, but 120VDC even more so.</div><div><br clear="none"></div><div>I just saw Alan's email come through - running it off lower voltage is definitely an option, but depends on the sort of motor. Ie. a brushed motor speed is proportional to the voltage applied (so running at 48VDC would give you less than half speed) - no idea what the Perry ones would be, but being older they may well be brushed. Brushless motor speed is proportional to frequency applied by the controller. In both cases torque is proportional to current which is proportional to heat generated. So the greater the current in your wires, the more heat needs to be dissipated, and if it's not then something will burn out - probably the thin layer of insulation on the motor windings. The trouble is dissipating the heat from the inner windings (it has to pass through the outer windings, which are producing their own heat) - but like Alan said, if you've got it oil compensated that will help a lot with heat dissipation. The thermal conductivity of oil is ~6x that of air (and water ~24x air), although the heat transfer is not quite as simple as that.</div><div><br clear="none"></div><div>I'm also pretty sure that the motor will have an inherent resistance that will be designed into it appropriate to the nominal voltage and current, and related to the size of the wires (ie. as Hank pointed out, thinner wires for high voltage as less current is required). So if you apply less voltage to the same resistance, it will draw less current - ie. I don't think you will be able to get extra current into the motor at lower voltage. Not quite that simple, but you get the idea.</div><div><br clear="none"></div><div>(that was mostly dredged up from memories of a university subject I did on electric motors a long time ago, feel free to correct me!)<br clear="none"><br clear="none"></div><div>Cheers,</div><div>Steve</div></div><div class="yiv9647400897gmail_extra"><br clear="none"><div class="yiv9647400897gmail_quote">On Wed, Apr 27, 2016 at 10:18 AM, hank pronk via Personal_Submersibles <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>></span> wrote:<br clear="none"><blockquote class="yiv9647400897gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204, 204, 204);border-left-width:1px;border-left-style:solid;"><div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div><span>Thanks" Kieth,</span></div><div dir="ltr"><span>I started to that but I have no idea if one system is better than another.</span></div><div dir="ltr"><span>Hank</span></div> <div><br clear="none"><br clear="none"></div><div style="display:block;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;"> <div style="font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px;"><div><div> <div dir="ltr"><font face="Arial" size="2"> On Tuesday, April 26, 2016 6:11 PM, k6fee via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></font></div> <br clear="none"><br clear="none"> </div></div><div><div><div><div><div><div>Hank,</div><div><br clear="none"></div><div>You want a dc-dc converter, just Google it.</div><div><br clear="none"></div><div>Keith T.</div><div><br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div><div style="color:rgb(87, 87, 87);font-size:85%;">Sent from my Verizon, Samsung Galaxy smartphone</div></div><div><br clear="none"></div><div><div style="color:rgb(0, 0, 0);font-size:100%;"><div>-------- Original message --------</div><div>From: hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Date: 4/26/16 4:53 PM (GMT-08:00) </div><div>To: Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> </div><div>Subject: [PSUBS-MAILIST] power converter </div><div><br clear="none"></div></div><div style="color:rgb(0, 0, 0);font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px;background-color:rgb(255, 255, 255);"><div>HELP,,,</div><div>Turns out my Perry thrusters are not 36V but 120 Vdc. I can only manage 48V dc from Gamma's battery bank. Can I step the voltage up with something.</div><div>Hank</div></div></div></div></div><br clear="none"></div></div><div>_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div><br clear="none"><br clear="none"></div> </div> </div> </div></div></div><br clear="none">_______________________________________________<br clear="none">
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