Re: December build of EMC

"Harrison, Doug" wrote:

> From: "Harrison, Doug" <dharrison@...>
>
> Matt;
>
> What drivers and motors are you using? I found that the large motors (like
> those on the Boss 5) tend to have significantly more resonance problems with
> bipolar chopper drivers than with the old L/R saturable reactor amplifiers.
> I had to use microstepping amplifiers at 5 substeps minimum to get rid of
> the resonance. The chopper drivers output a very harsh pulse which leads to
> noisy movement.

Yup, I was just thinking about the same thing. The hideous L-R drivers tend
to benefit from the AC losses from the big resistors damping the generated
voltages when the motor is moving. You might be able to add some electrical
damping across the motor windings, applying a few Ohms of resistor in parallel
with the motor windings.

Jon