Converter

[lyledunn]

A single phase to three phase rotary-type converter installed on a farm to drive a compressor has assymetric voltages to earth on the load side. I understand that this is a feature of such devices. The displacement between phases remains at 120degrees. Can any one tell me why an equal phase to earth voltage cannot be easily achieved?

Regards,

Lyledunn

 

[drillz]

I think that these rotary type converters are like kind_of_motors with the three sets of windings spaced around the rotor to give the three phases.........since its a mechanical device, and since the rotor may not always spin at constant speed -also since the physical spacing of the phase windings may not be truly exactly equally spaced around the rotor periphery, then you get the discrepancy.

If you want "better" three phase.....you can go for ....
1. rectification to DC..followed by...
2. Three phase inverter (this can be an off-the-shelf module)to give you your three phase output.

.....the switching of the inverter's switches can be controlled to give exactly 3 phase oupput with exact angular "spacing" between the phases.