On Sun, 11 Oct 2009 10:16:46 -0400, you wrote:

>So in short, it should be called a VSD, not a VFD.  A 
>VFD would need a 3 phase motor, and made to run synchronous if it is to have 
>usable torque at low speeds.  Minor nit picking to be sure but there is a 
>world of difference in the actual hardware.

As I said, there are several different boards, the latest designs use 3
phase motors, with an encoder on the motor shaft, giving feedback to a
VFD.

Steve Blackmore
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