I have had many problems with USB communications with motors and plasma. 
You can overcome these by putting an electrically isolated barrier in 
the usb line. There are some chips from Linear (LTM2448) that will do 
just that. The equipment on either end cannot be connected to the same 
ground or supply if you go this route.

On 2014-11-26 19:07, Karlsson & Wang wrote:
> PWM is great for efficient motor but unfortunately it is also very good at 
> disturbing digital communication. Do anybody had any problems with the 
> communication errors then motor start?
>
> Nicklas Karlsson
>
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-- 

Regards /Groete

Marius D. Liebenberg
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+27 12 743 6064
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