On Wed, Jun 16, 2010 at 4:32 PM, Andy Pugh <[email protected]>wrote:
> Though I have rather forgotten why I started this, I think it was the
> three servos I got off eBay for a bargain price.
>
>
All my best ideas seem to start out that way. Now I have two nice Moog BLDC
motors I bought on eBay, and am thinking of a project to put them in. The
Mesa board is sized just right to drive the two of them, and with your
driver I could control them via EMC2.
I did try one of them with Jon Elson's 3 phase amp, but because they have
Iron in the stators, there's just too much torque ripple at low speeds. At
high speeds, they seemed fine. Perhaps the rotational inertia helped
overcome the cogging.
Presumably you would be able to see a difference in following error (between
trapezoidal and sinusoidal) if you find the appropriate test. With
trapezoidal, and the motor moving very slowly, I noticed periodic excursions
in the FE that corresponded to transitions on the Hall sensors.
Neil
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