Once you have to voltage amplify may aswell forget the behringer and build 3 class B push pull valve amps with a choke load on the output delivering direct to the three phases of the motor at 400v per phase.
Whichever way you look at it chokes / autoformers are involved.
Might be better to buy a rotary inverter.
60Hz oscillator for turntables (also produces three phase)
- Paul Barker
- Loony Bin!
- Posts: 9254
- Joined: Mon May 21, 2007 9:42 pm
#16 Re: 60Hz oscillator for turntables (also produces three phase)
"Two things are infinite, the universe and human stupidity, and I am not yet completely sure about the universe." – Albert Einstein
#17 Re: 60Hz oscillator for turntables (also produces three phase)
Even better just replace motor with single phase one, but I was just pointing out that 3kW for £500 is hard to match with any valve solution, even before we look at the efficiency question.
Whenever an honest man discovers that he's mistaken, he will either cease to be mistaken or he will cease to be honest.
-
- Old Hand
- Posts: 249
- Joined: Fri Mar 25, 2016 10:58 am
#18 Re: 60Hz oscillator for turntables (also produces three phase)
Actually, it's better to keep the three phase motor and use either a static converter or a rotary converter. For best finish, you need smooth rotation, and single-phase motors produce far more vibration than three phase. I chose a static converter over the (cheaper) VFD solution not just because I didn't want the RF hash but also because it enables you to plug a choice of three phase machines into one box, whereas a VFD has to be matched to its motor, so you need one per motor.
In the end, it's all physics...