[PSUBS-MAILIST] speed controllers

[via Personal_Submersibles]

Any pictures or video?


Cliff Redus

> On Aug 25, 2017, at 6:52 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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 from
> old 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 long
> wire runs from your battery bank to controller. I am not totally
> clued up on this, but have heard it said to add capacitors along
> the wire run & twist the wires together to avoid inrush current
> from the break down of the electric field in the wiring. The PWM
> would cause a constant building up & breaking down of the magnetic
> field & a  consequent surging of electricity into the input capacitors.
> I guess a way around this would be to place the controller as close
> as possible to the battery source & run long runs of wire to the speed
> control potentiometer & on switch.
> These days the controllers have all sorts of parameters you have to
> program 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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> 
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