I have used a step up transformer with an inverter to feed a 3hp VFD
works fine. Cheep Triac type router controls don't work well with
Modified sine wave inverters (no control). If I had obtained a 220v
inverter and could have avoided the step up transformer, I would have
bypassed the inverter stage and run lines from the inverter DC bus
straight to the DC bus of the VFD avoiding the losses involved with the
rectifier bridge of the VFD, and H bridge of the inverter.
Kevin Pemberton
hardy71uk wrote:
>
>
> Thats extremely interesting Ron. Do the DC motors work fine on the
> rectified quasi sine wave? has anyone tried rectified quasi sine to
> power an AC drive ? ( usually above 2KW these are fed from rectified
> three phase sine)
>
> Chris S
>
> --- In electricboats@
> <mailto:electricboa
> >
> >
> >
> > Hi George,
> > The motors I made mention of, are in fact PM brush motors, they are
> rated 130V DC and 18.5 amps, 6750 rpm. Using a router speed control
> and a full wave bridge rectifier I can use batteries or grid power.
> >
> > The inverters give a one step increase 12vdc up to 120vac modified
> sine wave, 5,000watt cont. and a peak of 10,000watts for a few seconds.
> >
> > I have used a stepup transformer, 5000 watt, to deliver 240vac with
> about 21 amps to drive a Delta 2HP planer motor. (220vac 18amps 3450rpm).
> > I dabble and tinker quite a bit so I tend to mix and match things a
> lot, moving parts and pieces around I seem to never keep any one
> project in a complete and functioning group.
>
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