[PSUBS-MAILIST] speed controllers

[hank pronk via Personal_Submersibles]

Alan,I am going back to switches for now and will get proper controllers over the winter.  Lucky for me I have back up travel motors that saved the day.Also my inflatable is an absolute dream!  can bump into the sub all you want.  Now I just hit the brakes and Gamma drifts off untethered off the trailer. Then I park the truck and hop in the inflatable to retrieve Gamma.  Nice!Hank

On Friday, August 25, 2017, 5:45:29 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

They should have DC brushless controllers down to a fine art.There are so many electric bikes & rickshaws over there.Also they are so dominant in the electric RC market that requires reliable DC controllers.Maybe Hank got some backyard manufacturer using parts fromold TVs.I was told to over size my controller by about double.Buy a 3000W controller for a 1500W motor.Also the manufacturers get nervous when you talk about longwire runs from your battery bank to controller. I am not totallyclued up on this, but have heard it said to add capacitors alongthe wire run & twist the wires together to avoid inrush currentfrom the break down of the electric field in the wiring. The PWMwould cause a constant building up & breaking down of the magneticfield & a  consequent surging of electricity into the input capacitors.I guess a way around this would be to place the controller as closeas possible to the battery source & run long runs of wire to the speedcontrol potentiometer & on switch.These days the controllers have all sorts of parameters you have toprogram in to them when they arrive. Gets very confusing!Alan

Sent from my iPad
On 26/08/2017, at 11:15 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



I read a book about manufacturing in China which I found quite interesting:

"Poorly Made in China" by Paul Midler.

Gives some of the background explanation behind the lack of quality control.

Sean



On August 25, 2017 4:23:28 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
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!  Hank


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