Re: [CAD_CAM_EDM_DRO] 3 Phase drive

Both Analog devices and TI have DSPs that will do what you want and they
aren't that expensive. I have been staring at this problem for years now,
and
it keeps getting easier and easier. At a very minimum, the motor control
section
of those two companies' web sites would be a good start.
The TI '240x in particular are some very attractive chips. In fact they
almost have
too much stuff on them. But in particular, they have a lot of PWM outputs.

Also the AD DASH series is a 28 pin dip that can do 3phase pwm, and it may
be easier to develop for.
Eric

> Quite impressive for an apparently 'amateur' design, meaning one guy did
> it in his basement! But, what I'm looking for is an inverter that can

handle

> greater than 10:1 speed changes, and frequencies up to 1500 Hz or so.
> The PWM patterns pre-programmed for discrete voltage levels into an
> EPROM just doesn't cut it, unless you use an awfully big EPROM.
> I guess that is certainly an option, now, as 1 MBit EPROMS are pretty
> standard devices. I'll have to think about that.
>
> The neat thing about the ML4423 chip is that is would generate CLOSED-LOOP
> output voltages 'on the fly', corrcting for any distortions caused by

motor

> currents, etc. It would also run 1, 2 or 3-phase motors by selecting the
> right jumper connection. (Well, a different EPROM pattern would fix that
> problem.)
>
> Jon