Christian Corti wrote:
The simplest solution: Buy a UPS and tell it to
output 230V/50Hz...
All common inexpensive UPSes will not output a substantially
different
voltage or frequency than the input, because they are really SPSes
(Standby Power Supply), and the load only runs on the inverter when the
mains power fails. A true UPS (also known as an "online UPS") that runs
the load on the inverter is much more expensive. Most of the price
difference is probably due to the much lower production volume of the
UPS, but it is the case that the AC-DC front end of an SPS will be less
expensive to manufacture since it only has to supply enough current to
charge the battery, not to simultaneously charge the battery and power
the load.
The small/cheap UPSes I've had to repair seem to contain one trasnformer
which is used as a step-down transformer when the mains input is present
(to charge the battery) and as a step-up transformer (driven by the power
transitors/mosfets from said battery) when the mains fails. So no way can
it change mains of one freqeuncy into another without a second
transformer, etc.
I wonder if the output waveform of such UPSes (and indeed the inverters
you an get to run mains-powered stuff off the car battery) is good enough
to run things like RK05 spindle motors.
-tony