From: oj@invalid.invalid
wrote in message
news:2a944446-a40a-4af6-b158-bf30371928b2@googlegroups.com...
>I found a Hunter DSP 9000 wheel balancer I would like to have for my home
>shop. The problem is it is 230 volt three phase. I only have single phase
>available to me.
>
> Can anyone tell me if a static converter would work for this application
> or what is the cheapest esiest way to make something like this work?
>
> I appreciate it!
VFDs were mentioned, and yes in general that can be done. Normally, one
sizes the VFD at double the rating of the load if using it in this fashion
(single phase in, and three phase load on the VFD output). E.g., if the
load is rated 10A, 230V, 3 phase, then the VFD should be rated 20A, 230V.
The VFD will pull in a lot more than 10A on each of the two energized input
phases, in order to deliver 10A out on each of the three energized output
phases, and therefore needs to be rated higher than 10A to handle that
higher input current.
The VFD input current distortion will be very high. If this load is a fair
portion of your total load then this can become problematic.
VFD output voltages are kind of tough on motor insulation. The VFD output
is a PWM waveform with pulses that have a very fast rise time, which travel
down the wire and reflect, leaving the motor insulation subject to voltage
transients up to about 3x the nominal motor voltage. Over time this can
break down the winding insulation and cause the motor to fail. Where I am,
it is madatory that a motor that is connected to a VFD be rated and labeled
as 'inverter duty rated' (NEMA MG part 31) for this reason. I do not know
whether that is the case where you are. I have heard it said that motors
with Class F insulation and SF 1.15 are generally able to handle being
powered by VFDs fairly well. But, caveat emptor.
j
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