Re: Problem with Synchronous Motor and Timing Light

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bigfoo39-at-telocity-dot-com>

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>Thanks.  So i guess i need to tune my SRSG everytime before i use my coil???
>I thought a salient pole motor would start up in the same position every
>time i powered it up.
>
>Dan
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snipperzz...

Hi Dan ...

salient pole motors will lock up onto the rotor "in the same place" each 
time it is turned on ( well at least in 90 degree increments). 
hysterisis types can lock up at  (360 degrees/ number of rods in 
rotor/2) degree intervals ( i think I have my math correct :) ) 

modified 1725 rpm induction motors will lock in at 90 degree intervals 
3600 rpms lock in at 180 degree intervals

BTW...   I have noticed that when running a 1725 modified motor, if you 
"reverse" the plug ( plug it in upside down) it will throw the rotor 45 
degrees out of phase...  havent figured this one out yet....


see if Dr. Res will exchange the motor for a salient pole....

hang in there ...   it could be worse   you could be learning about 
lasers instead ;)

Scot D