thebes Posted June 30, 2005 Share Posted June 30, 2005 Ran across this listing in the local craigslist and was curious as to what the heck he's talking about. "Dynamotor, a big one! 28VDC input, 600VDC out (if I remember correctly). Mounted on original base and in very nice condition. 1940's. No sensitive transistors to fail in this thing :-) $10" Quote Link to comment Share on other sites More sharing options...
Deang Posted June 30, 2005 Share Posted June 30, 2005 "A rotating electric machine with two armatures, used to convert alternating current to direct current." Everything I can find has to do with WW II radios -- link below is to a pic of one. http://members.cox.net/aafradio/garajmahal/TBX-2arm.html Quote Link to comment Share on other sites More sharing options...
DRBILL Posted June 30, 2005 Share Posted June 30, 2005 Please pass the "hash"! (Hint: You need to be a HAM from the 40's to know this one.) DR BILL Quote Link to comment Share on other sites More sharing options...
boom3 Posted June 30, 2005 Share Posted June 30, 2005 Besides the DC to AC mentioned, before solid state frequency changers were available, dynamotors, sometimes called motor-generators, were used to convert 60 Hz to 400 Hz for aircraft and ship use. These were still in use in the 80s because they were pretty reliable. Yes DRBILL, some of us got the hash remark! In-line inductors were often used to control the noise placed on the AC line by the dynamotor, hence called hash filters. Quote Link to comment Share on other sites More sharing options...
BEC Posted June 30, 2005 Share Posted June 30, 2005 Also motor-generators are still used on some plants where power to something is so important that even a brief power failure while a separate power source is brought on line cannot be tolerated. In one case I am very familiar with at a Nuclear Plant, a motor-generator is used to provide power to the reactor control rod mechanisms. The motor-generator has a flywheel weighing several tons. Even with loss of drive power, the flywheel keeps the generator going for long enough to get alternate power on line. Bob Quote Link to comment Share on other sites More sharing options...
seti Posted June 30, 2005 Share Posted June 30, 2005 ---------------- On 6/30/2005 3:04:12 PM BEC wrote: Also motor-generators are still used on some plants where power to something is so important that even a brief power failure while a separate power source is brought on line cannot be tolerated. In one case I am very familiar with at a Nuclear Plant, a motor-generator is used to provide power to the reactor control rod mechanisms. The motor-generator has a flywheel weighing several tons. Even with loss of drive power, the flywheel keeps the generator going for long enough to get alternate power on line. Bob ---------------- Like the Nuke plant in your backyard that gives me the creeps whenever I go past it for some reason that song duck and cover goes through my head everytime I see it. Nice to know about the safeguards. Quote Link to comment Share on other sites More sharing options...
thebes Posted June 30, 2005 Author Share Posted June 30, 2005 Wow, that was fast! Sounds like a pretty interesting gizmo, but given my penchant for electrifying myself, I'd better stay away. The main reason I asked is for some reason that term, dynamotor (not dynamo) seemed very familiar to me. Thanks guys. Quote Link to comment Share on other sites More sharing options...
BEC Posted June 30, 2005 Share Posted June 30, 2005 ---------------- On 6/30/2005 3:58:38 PM seti wrote: ---------------- On 6/30/2005 3:04:12 PM BEC wrote: Also motor-generators are still used on some plants where power to something is so important that even a brief power failure while a separate power source is brought on line cannot be tolerated. In one case I am very familiar with at a Nuclear Plant, a motor-generator is used to provide power to the reactor control rod mechanisms. The motor-generator has a flywheel weighing several tons. Even with loss of drive power, the flywheel keeps the generator going for long enough to get alternate power on line. Bob ---------------- Like the Nuke plant in your backyard that gives me the creeps whenever I go past it for some reason that song duck and cover goes through my head everytime I see it. Nice to know about the safeguards. ---------------- seti, Don't worry about that nuclear plant in my backyard. I have laid my hands on almost every part of it and tested it all over and over. Now some of my younger kin-folks are keeping it in shape for us. I wonder if they are still using the procedure I wrote for freeing a stuck reactor control rod by "vibrating the rod casing with a 2000 gram mass" (rapping the sucker with a 5 pound hammer). Bob Quote Link to comment Share on other sites More sharing options...
scriven Posted June 30, 2005 Share Posted June 30, 2005 Bob, 2000 grams would be a 4.4 pound hammer. Quote Link to comment Share on other sites More sharing options...
Marvel Posted June 30, 2005 Share Posted June 30, 2005 There are only 10 kinds of people in the world. Those who understand binary and those who don't. Quote Link to comment Share on other sites More sharing options...
BEC Posted June 30, 2005 Share Posted June 30, 2005 ---------------- On 6/30/2005 8:17:06 PM scriven wrote: Bob, 2000 grams would be a 4.4 pound hammer. ---------------- Mis-typed. Should have been rounded off to a 5 pound hammer. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted June 30, 2005 Share Posted June 30, 2005 Uh, one would think that at a Nuclear Power Facility, that kind of thing would be critical. God help us if someone uses the 4.4 LB hammer instead of the 5 LB one. Quote Link to comment Share on other sites More sharing options...
BEC Posted June 30, 2005 Share Posted June 30, 2005 Dean, It is bad form to use the word "critical" to a guy on top of the reactor head trying to get a control rod un-stuck with a hammer. Bob Quote Link to comment Share on other sites More sharing options...
scriven Posted July 1, 2005 Share Posted July 1, 2005 Ok, I think I understand. Dont force it, get a bigger hammer! Quote Link to comment Share on other sites More sharing options...
djk Posted July 1, 2005 Share Posted July 1, 2005 "There are only 10 kinds of people in the world. Those who understand binary and those who don't." Somebody hand me that delicate front panel adjustment tool (hammer)! Quote Link to comment Share on other sites More sharing options...
seti Posted July 1, 2005 Share Posted July 1, 2005 ---------------- On 6/30/2005 10:57:24 PM BEC wrote: Dean, It is bad form to use the word "critical" to a guy on top of the reactor head trying to get a control rod un-stuck with a hammer. Bob ---------------- ROFL critical or oops Well I feel better about it already~! As long as they have the hammer situation straight. Quote Link to comment Share on other sites More sharing options...
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