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Re: Rotary GAP
Hi Robin,
Glad the strobe light is working for you. I see you have quickly found in
interesting problem...
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.
Cheers,
Terry
-------------
Terry,
I have modified my motor for sync duty and used your little 'sync tester'
circuit
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
flats
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,
sometimes
it 'syncs' at the 9 - 3 oclock position. why? There is no argument that the
motor
is syncing, I tested the tester,( watching the watcher?), using my CRO and
it is
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
would
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.
Regards,
Robin in OZ
p.s. Adelaide SA is DEFINITELY the end of the earth yuri!! any further
south and
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:
>
> http://www.peakpeak-dot-com/~terryf/tesla/misc/RGAP.ZIP
>
> http://www.peakpeak-dot-com/~terryf/tesla/misc/syncmot.zip
>
> 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...
> <snips>