On 4/24/2013 10:27 AM, David Robbins wrote:
Apr 24, 2013 01:11:57 PM, jim@audiosystemsgroup.com wrote:
The single most critical thing that must be done to contain the trash
produced by a VFD is to locate both the 3-phase transformer and the
motor controller AT THE MOTOR, so that the wiring between these three
elements has "zero length."
that could be REALLY hard if the motor is at the bottom of a well!
Yes. BUT -- there's a great solution -- make every current path twisted
pair, with pairs for the three phases bundled tightly together! Now the
field is small because the loop area is small, and radiation is also
minimized.
73, Jim K9YC
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