[PSUBS-MAILIST] speed controllers

[Alan via Personal_Submersibles]

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
>> 
>> Personal_Submersibles mailing list
>> Personal_Submersibles at psubs.org
>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
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