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3-phase "equalisation" transformer?
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Circlotron:

--- Quote from: Kleinstein on August 02, 2019, 06:23:53 pm ---The zig-zag transformer might improve the balance a little, but it is not 100% coupling.

Anyway the problem with the motor should have nothing todo with imbalance, more with insufficient voltage. Usually one needs to increase the voltage if a higher frequency is used - often a voltage about proportional to frequency is used.

If a higher speed is wanted, I would not start with a rare 1000 U/min motor, but with a more normal 2900 U/min (at 50Hz) motor, so already 3 times the speed. A US motor for the lower 208 V and 60 Hz could also be a good idea. There are also special motors for higher frequencies: something like 200 V at 300 Hz is sometimes used.

--- End quote ---
Two things - I’m just messing around with a junk motor I pulled out of the rubbish at work. Trying to see how fast I can make it go, not actually trying to do anything useful with it. I know that it isn’t being fed enough voltage, especially at high speed. Second, I know a zig zag transformer won’t make the motor run any better with my particular test setup. I was simply thinking about 3-phase stuff and I wondered if there was a transformer of sorts that would oppose any unbalanced voltages applied to it. Similar in principle to a transformer that has two 120v windings and you connect each winding to a separate 120vac source, both sources in phase. The transformer will draw current from the source that is slightly higher in voltage and supply current to the source that is slightly lower in voltage. Just wondering if there was a transformer that could do the same thing with 3 different sources of approximately the same voltage but this time separated by 120 degrees.
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