Re: [CAD_CAM_EDM_DRO] 3 Phase drive

Spehro Pefhany wrote:

> At 07:12 PM 8/28/01 +0000, you wrote:
>
> >Gee, I just looked at their web site, and can't find any mention of the
> >44xx series of parts at all. I wonder if they sold this product line to
> >another company.
>
> I think you are right, it was sold to another company (Fairchild?) and
> then discontinued. I wasted a bit of time ($$$$) on that one 8-(
>
> Most everyone is going with microcontrollers these days. Not very
> hobby friendly, but that's the way it is.

Yup, having to write 4000 lines of very tight (both time and memory)
code in a new flavor of micro that requires a $9995 development
kit just to get signals out of the chip is definitely an impediment
to a home shop project! That sure is a disappointment, because the
ML4423 looked like the only sane way to make a high frequency
inverter for high speed drill spindles. I need to go to about 1500
Hz, and I don't think any of the inverter drive chips based on a
CPU and some special logic will do it worth a darn. They are all
designed for 60 hz nominal. Well, now that I'm getting pretty good at
FPGA designs, maybe I could come up with something using them.

Jon