Electronics > Beginners

3 Phase Generator Circuit

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David Hess:

--- Quote from: Windows9Professional on February 20, 2020, 05:38:28 pm ---For testing of an three phase induction motor I would need a powerful three phase generator (120° phase shifted).

Is there a simple circuit for this job?

I was thinking of an SPWM sine generator with just 3 lookup-tables for sinewaves which are simply 120° out of phase, but that seems a bit of overkill.
--- End quote ---

Analog and digital logic 3 phase oscillators are pretty easy to make but output power stages are not.

Windows9Professional:

--- Quote from: Benta on February 20, 2020, 10:24:20 pm ---You still didn't reply to the questions in reply #1 (from me).

--- End quote ---

Like I said: I'm looking for an Low Voltage, three phase generator with reasonable current capability or for an DIY alternative

Windows9Professional:

--- Quote from: David Hess on February 21, 2020, 01:17:20 am ---Analog and digital logic 3 phase oscillators are pretty easy to make but output power stages are not.

--- End quote ---

I was thinking of an H-Bridge with a low pass filter on the output for every phase, would that work?

Dave:
Electric motors are inductive, they don't need any filtering of the excitation voltage.


--- Quote from: Windows9Professional on February 21, 2020, 11:11:56 am ---Like I said: I'm looking for an Low Voltage, three phase generator with reasonable current capability or for an DIY alternative

--- End quote ---
Low voltage and reasonable current. Gotcha. Now we know exactly what you need. :palm:

Zero999:

--- Quote from: Windows9Professional on February 20, 2020, 09:58:59 pm ---Yeah I didn't provide much information at first and since I'm only a hobbyist I think I will go with the SPWM method, which fits my budget better.

I don't think that ESCs for brushless DC motors will work since these are usually meant to operate with synchronous motors instead of asynchronous induction motors

--- End quote ---
I don't see why a brushless motor driver won't work. The simpler and dumber the drive, the greater chance it stands of working. Try a cheap one, they're not expensive.


--- Quote from: Dave on February 21, 2020, 12:03:02 pm ---
--- Quote from: Windows9Professional on February 21, 2020, 11:11:56 am ---Like I said: I'm looking for an Low Voltage, three phase generator with reasonable current capability or for an DIY alternative

--- End quote ---
Low voltage and reasonable current. Gotcha. Now we know exactly what you need. :palm:

--- End quote ---
Well mains is low voltage, so a standard variable frequency drive, would meet his requirements.  :-DD
https://en.wikipedia.org/wiki/Low_voltage#IEC_Definition
AC RMS voltage (V): 50 to 1 000

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