I guarantee you won't build one for less than you can buy one. The 240 VAC to DC to three phase power circuit alone is going to cost you more than you can buy a complete off the shelf unit for.What Im looking for is very basic and VFD are too pricey for my what i need.
Basically I need to take 230vac from mains power supply to drive the 3 phase motor
What I need to be able to do is start the motor and when needed to stop relatively fast but without
a hard brake (ie half speed after 1sec then stop)
I guarantee you won't build one for less than you can buy one. The 240 VAC to DC to three phase power circuit alone is going to cost you more than you can buy a complete off the shelf unit for.
Especially given a good used VFD's are pretty cheap and plentiful. I've acquired many 1 - 5 HP capacity units for less than $50. Some for under $10 and a few just for removing them from their original applications because the machinery they were a part of was being scrapped.
eBay. $50 - 60 will get you choice of over a dozen that fit that power rating right now.yes ideally a 2-3 HP setup for $30 or less is perfect where to get it is the issue
I did a little googling. There is a thread on Arduino forums talking about commercial 100 USD VFD that takes 5 volt control signals. Arduino Uno, which is 5 volt system, would be well suited for such VFD. VFD does the motor operation and Uno does the control.I don't think you'll have too much success with an arduino "plug & play" solution.
In my opinion unless you really know what you are doing I'd suggest to stay away from the voltages involved......well that's the route I took. All in all I feel that in the long run a VFD with turn out to be a more cost effective, reliable & safer solution.
Arduino isn't the answer to everything, despite all the hype. Don't take that as knocking the product, as a entry level learning tool they are probably good, but I feel there's too much copy & paste going on. I'll stop with my "Old Man's" rant and go shout at some clouds.
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by Gary Elinoff