19 Jun
2014
19 Jun
'14
10:36 a.m.
On 06/19/2014 07:13 AM, Paul Koning wrote:
Those are rotary converters, and when built correctly
they have
excellent phase balance. Some of the articles discuss in detail how
to achieve that. Basicallly, those are rotary transformers, very
similar to the old ?dynamotor? power supplies found in WW2 era
military radio gear. Think of it as a motor and generator, merged
together.
As others have noted, a dynamotor is a different animal.
It's my understanding (and experience) that RPCs are fine for driving
3-phase motors. In fact, the more motors on the load, the better the
phase balance.
However, if you're using non-motor equipment, where any phase does not
carry the same load as any other phase, RPCs suffer badly, unless WAY
overspec-ed for the load.
A good place to pick up a cheap 3-phase motor is a rewinding service.
They often have spares that they'll sell for very reasonable prices.
--Chuck