Re: Salient Pole Motor Modifications Questions

["R.E.Burnett" <R.E.Burnett-at-xxxxxxxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Adam,

This 1/4 hp 1725 rpm motor should be ideal for the salient pole
modification.  Don't worry about the aluminium strip that is visible
in the photo.  This is just one of many aluminium "shorting bars" which
run diagonally through the laminated iron rotor.

When you machine the 4 flats,  you will automatically grind into several
of these channels of Aluminium as well as the iron.

I would say that you cannot predict the "right" position to grind the
flats in advance.  It depends on the motor torque, depth of flats, disk
windage, tank capacitor,  power supply rating etc.. etc..  Best make the
phase adjustable,  then you can dial up the sweet spot.

							Cheers,

							-Richie,

On Fri, 10 Nov 2000, Tesla list wrote:

> Original poster: "Yurtle Turtle" <yurtle_t-at-yahoo-dot-com> 
> 
> I recently obtained a 1/4 hp 120 volt 1725 rpm motor,
> I'm planning on modifying for salient pole sync
> operation. My motor has run windings and no run or
> start cap. I have downloaded and read all of the info
> available, but ran across something I'm not 100% sure
> of. My motor rotor has a single shallow diagonal
> groove, which appears to be partially filled with
> aluminum. Please see
> http://www.geocities-dot-com/yurtle_t/rotor.jpg.
> 
> My question is whether this should be in a flat,
> between a flat, or does it matter at all.
> 
> Also, is there any way to predetermine where the motor
> rotor will sync, relative to the mains? My motor rotor
> shaft has a flatspot, originally for attaching a
> pulley. I'd like the flat spot on the shaft to be more
> or less straight up when my gaps should fire. That
> would assist in attaching a hub to my gap rotor.
> 
> thanks again
> 
> Adam
> 
> =====
> Adam Minchey
> yurtle_t-at-yahoo-dot-com
> www.geocities-dot-com/yurtle_t/index.htm
> 
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