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I was looking through my schools junkyard and I found a large mill this mill had a very large motor in it. I took it out and cleaned it then tested the speed. It ran at 1796 RPM and is a Westinghouse motor it is really nice. It is very well constructed and is 5A 120V 1 phase. designed for continuous operation. I can run it at 50% power from a variac and it is silent bit when I have it at 100% it is rather noisy . Here are some pics of it tell me what you think if I can use this for a synchronous SG.
Registered Member #697
Joined: Thu May 10 2007, 12:28PM
Location: Australia
Posts: 22
I've not designed or built a SGTC before however I dont think you need such a large motor. Assuming its RPM is enough for the task though, I dont see why it couldn't be used.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Synchronous implies that it follows the AC waveform exactly. The AC current induces a magnetic field in the coils and the rotor precisely follows the rotating field. This insures that your gap is firing exactly at the same spot relative to the AC waveform. If it is off by any amount the gap will move down the curve and start firing at progressively farther points from the peak.
Ill see if I can either modify it or use another I found one that is synchronous but it is 10 RPM I need to change the gears. thanks for the help last question scenes it isn't synchronous if I use this in a asynchronous SG then how will it be advantages rather than a normal static SG?
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
If you are interested there is someone on Ebay who is selling true synchronous motors.
He is only asking $48 so why would you want to take a motor apart and monkey around? Your time isn't worth the $48+s/h it will cost you to just buy a working one.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Wow, what a mark up! I used to buy those motors for 10 dollars from either american science and surplus, or herbach and rademan (do a search, i think H and R had them last i checked). They arent super strong motors, so either do a propeller gap, or a small disk as the ebay auction shows.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Steve Conner wrote ...
If you want it to be synchronous, you'll need to grind four flats on the rotor. This is best done by a machine shop.
Why? My understanding is that a SM has permanent magnets instead of relying on induction, and therefore there is zero slip
IamSmooth wrote ...
He is only asking $48 so why would you want to take a motor apart and monkey around? Your time isn't worth the $48+s/h it will cost you to just buy a working one.
Whoa, I think $50 is quite a lot of money for most hobbyists, and if you would not want to "monkey around" with a motor, why would you "monkey around" with a Tesla coil? It serves no useful purpose after all.
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New synchronous motor?
