<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>They should have DC brushless controllers down to a fine art.</div><div id="AppleMailSignature">There are so many electric bikes & rickshaws over there.</div><div id="AppleMailSignature">Also they are so dominant in the electric RC market that requires </div><div id="AppleMailSignature">reliable DC controllers.</div><div id="AppleMailSignature">Maybe Hank got some backyard manufacturer using parts from</div><div id="AppleMailSignature">old TVs.</div><div id="AppleMailSignature">I was told to over size my controller by about double.</div><div id="AppleMailSignature">Buy a 3000W controller for a 1500W motor.</div><div id="AppleMailSignature">Also the manufacturers get nervous when you talk about long</div><div id="AppleMailSignature">wire runs from your battery bank to controller. I am not totally</div><div id="AppleMailSignature">clued up on this, but have heard it said to add capacitors along</div><div id="AppleMailSignature">the wire run & twist the wires together to avoid inrush current</div><div id="AppleMailSignature">from the break down of the electric field in the wiring. The PWM</div><div id="AppleMailSignature">would cause a constant building up & breaking down of the magnetic</div><div id="AppleMailSignature">field & a consequent surging of electricity into the input capacitors.</div><div id="AppleMailSignature">I guess a way around this would be to place the controller as close</div><div id="AppleMailSignature">as possible to the battery source & run long runs of wire to the speed</div><div id="AppleMailSignature">control potentiometer & on switch.</div><div id="AppleMailSignature">These days the controllers have all sorts of parameters you have to</div><div id="AppleMailSignature">program in to them when they arrive. Gets very confusing!</div><div id="AppleMailSignature">Alan</div><div id="AppleMailSignature"><br><br>Sent from my iPad</div><div><br>On 26/08/2017, at 11:15 AM, Sean T. Stevenson via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><p dir="ltr">I read a book about manufacturing in China which I found quite interesting:</p>
<p dir="ltr">"Poorly Made in China" by Paul Midler.</p>
<p dir="ltr">Gives some of the background explanation behind the lack of quality control.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">On August 25, 2017 4:23:28 PM MDT, hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Well I learned another lesson today. I went for a very unexpected dive in Gamma today and both new speed controllers quit. Don't buy electronic parts from China ! Ever! </div><div>Hank</div></div><p style="margin-top: 2.5em; margin-bottom: 1em; border-bottom: 1px solid #000"></p><pre class="k9mail"><hr><br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br></pre></blockquote></div>
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