> Now.  Why is it not available?  Two reasons.  The key thing about the
> STMBL for 3 phase AC servos was that it used single driver for all three
> windings.  Probably originally designed for washing machines.  It was
> discontinued.  A different one with slightly lower power was available.
> There are others but different pinout so board change.
>

Yes, the same style driver chip found in all the chinese drives too. A
27pin PDIP
I opened a Chinese drive up and it looked to be a text-book implementation
of one of these drivers. With very little noise suppression though.

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