Re: John Freau's Phase Controller

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Original poster: Terrell Fritz <terrellfone@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

A modified 1/4 HP motor draws about 5 amps of current.  If your motor 
only draws 0.35 amps, the capacitor values an such might be different 
by an order of magnitude.  I have no idea how to go about fixing 
that, but that might be what the problem is.

Cheers,

  Terry


At 09:19 PM 1/19/2007, you wrote:
> Original poster: westland <westland@xxxxxx>
>
> I know the application of John Freau's Phase controller has been 
> discussed previously; in particular Terry Fritz conducted some 
> rather involved tests, and ultimately was able to attain 70 degrees 
> advance with the circuit.
> I've not been as successful.  I've been trying the circuit on a .35 
> A Oriental synchronous (reaction) motor with a variety of capacitor 
> sizes, though, and at best can only achieve 15 degrees of 
> change.  My variac is a small one, with inductance tuning from 0 to 
> 400 nH ... I can generally use less than 100 nH before I lose synch 
> on the motor.   I've followed John's advice to look for the cap that 
> provides around 3-5 volt rise on the motor usage (somewhere around 
> 3-4 microF) but to no avail. And I've tried cap sizes ranging from 1 
> microF to around 50 microF.    Has anyone had a similar experience 
> with the circuit ... there don't seem to be too many parameters to 
> adjust, and with so many success stories, I wonder if it is not just 
> one of the idiosyncrasies of this particular motor.
> Chris Westland