Re: Rotary GAP
Glad the strobe light is working for you. I see you have quickly found in
A non salient pole motor will lock in a synchronous position but it can be
anywhere. 10, 45, 123, 321... degrees. you always have to adjust it. A
salient pole motor always locks onto the poles of the motor. So my four
rotor electrodes are always where they should be. It will always lock at
12 - 3 - 6 - 9 o'clock as you observe. Perhaps a minor difference
somewhere makes it favor on over the other.
Of course, you suspicion is correct, with 10 electrodes, the 3 and 9
positions are a problem. There is no magic solution. Either go to 12
electrodes (which is probably not easy at this point). Or you may have to
"bump" the power switch once in a while if it locks in the 3 - 9 position.
I have modified my motor for sync duty and used your little 'sync tester'
design to check that it was in fact 'in sync'. some observations:
- the motor is a 1 hp 1450,(was, now is 1500), rpm unit keyed shaft, four
cut in by milling machine.
a) using your 'tester' I see that the 'key' is 'frozen' at two points 180 deg
apart, for example 12 and 6 oclock. if I repeatedly stop and start the motor it
'almost' always syncs back into the same 12 - 6 oclock positions BUTTT,
it 'syncs' at the 9 - 3 oclock position. why? There is no argument that the
is syncing, I tested the tester,( watching the watcher?), using my CRO and
working exactly the same as your cro image.
The reason I may have a problem with this as the rotor disk is 10 pole - it
appear that perhaps I should have gone 12 pole to ensure the same operation for
'both' sync positions, i.e. 1 gap at 12 - 3 - 6 - 9 oclock positions.
Robin in OZ
p.s. Adelaide SA is DEFINITELY the end of the earth yuri!! any further
you get to walk on ice bergs from antarctica!!
Tesla List wrote:
> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
> Hi Travis,
> A picture is worth a thousand words... See the files at:
> The first is a bunch of pics of my gap and the second is on motor
> conversion to a sync motor. These will get you started...