If the PID cycled fast enough, couldn't you do that with one loop and DAC?
> >    Olin Lathrop proposed to me that I should change
> > the PID focus and use an scheme based on look up
> > tables because the magnetic fields isn4t as linear as
> > the position.
>
> What I suggested was adding a layer beneath the PID that
> provides a linear
> force interface.  The PID output signal would drive the
> desired force on
> the ball.
>
>
>

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