|To:||Towertalk Reflector <email@example.com>|
|Subject:||Re: [TowerTalk] Figuring Out Prop Pitch Wiring|
|From:||Jim Smith <firstname.lastname@example.org>|
|Date:||Tue, 12 Oct 2004 22:14:02 -0700|
The selsyns I used to have had 5 wires, 3 stator and 2 rotor. The
stator was a 3 phase winding and was not connected to the rotor. I
remember this clearly because once in the 60s at a UBC dance I drove the
rotor of one from an audio amp, and connected each stator wire to its
own audio amp and speaker. The speakers were appropriately distributed
around the periphery of the auditorium. Don't remember how I dealt with
the ground return. Maybe I had 3 transformers, one across each stator
Then I fed the Beatles' "Day In A Life" into the rotor while slowly turning the rotor by hand. This caused a number of people to act very strangely indeed, especially when I sped it up and slowed it down.
So, if these selsyns are like mine, there will be 5 wires. Find 2 which show some resistance between them but no connection to the other 3 wires. These are the rotor wires. The other 3 are the stator wires. The resistance between any pair of them should be the same as between any of the other 2 pairs.
As I recall, the 2 rotors were connected in series with an ac voltage source, although I suppose parallel would work just as well. Mine were 60 Hz but I think 400 Hz is more common. Don't remember the voltage. The stator wires for one were connected to the stator wires of the other. Doesn't matter which goes to which except that if you get it wrong, the indicator will turn the wrong way when you turn the sensor. Just reverse any 2 stator wires.
Hope this helps.
73 de Jim Smith VE7FO
Ward Silver wrote:
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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