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Re: [TCML] homebrew VFD?
I assume you're trying to make a single phase VFD. I ran a single phase motor from a 3 phase vfd by disabling it's phase imbalance monitoring. It worked OK up to a point. If I ran it too slow, the motor's internal centrifugal switch started disengaging. I considered adjusting the weights, so it would engage at a lower speed, but ended up buying a 3 phase motor. My smaller sync motor doesn't have this switch, so I'm sure it would have worked just fine.
Adam
--- On Mon, 5/10/10, Scott Bogard <sdbogard@xxxxxxxxx> wrote:
> From: Scott Bogard <sdbogard@xxxxxxxxx>
> Subject: [TCML] homebrew VFD?
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Date: Monday, May 10, 2010, 1:34 PM
> Greetings all,
> While my intentions with this are
> completely off topic, the information could be extremely
> helpful for those running asynchronous rotaries, and I know
> of nobody else to ask this question, thus I fell no guilt
> putting it here. I want to know if it is possible to
> essentially build a variable frequency drive, this is what I
> had in mind. Get a mot, remove the windings then make
> your own to take 36V to 120V. Drive the primary with a
> variable flyback type inverter, designed for 1-120 Hz.
> So we have a DC square wave entering the primary. On
> the secondary put a capacitor sized to take a square wave
> and make it nearly sinusoidal (so perhaps a cap resonate
> with about 90 Hz?). And then feed your secondary into
> your induction motor winding. It seems to make sense
> in my head but it seems a bit too simple, perhaps the square
> wave will not really drive the mot core correctly because of
> saturation in which case I don't know what to do. Any
> thoughts or should I just abandon this.
>
> Scott Bogard.
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