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Two pole motors are actually Re:Phase converte

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benny2

03-10-2006 19:34:49

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Two pole motors are actually 3 pole motors one extra pole is offset said to cause what is known as a heavy north. With 2 pole motors they may start very hard on a dead center lock without it. All 60 Hz motors that are rated at 3450 or so, the RPMs varies slightly from make to make, are considered 2 pole. So if your motor is 3450 it has or is considered to have 2 poles. The flux tear or generator slip as it known, is only the difference of the actual run speed and the natural ("Synchronous") speed of 3600 which is only 150 rpm. When this speed fluctuates the power output fluctuates and causes cycling.
Now you just happen to have what I consider the best motor, the Baldor, for use in phase converters. To make your system run at optimum performance, there are a few things that will make this a great system. The first thing is to make sure is that the "generator motor" is running in the same direction as the air compressor motor. That the leads meaning the 1 2 3 are in parallel to each other in their respective connections. Now I am not any smarter than most any average guy I just took an interest in these units as I did accumulate many motors that I needed to find a market for. I have been at these things "converters" for nearly 35 years. And was very curious in more than just putting them together I wanted to know how they worked. There are no books out there on the theory at least not when I started with them. But I got very lucky on having a teacher about Induction generators. He may have been the originator to the whole home brew 3 phase power thing. His first one he built was in about 1951. He was an electrical engineer that worked for BPA that was on loan to the Bureau of Reclamation that was on a quest to develop inexpensive micro generating plants for farms and rural areas using the water power that fed the farms in the Columbia Basin Wa & Or. When looking into this they developed mini Hydro Plants on the farms using induction motors as generators (mostly 12 pole). Most wind towers now use this same plan and concept developed then. This was mainly before the Power was installed in much of this area. While not much came of this then, as it was scraped in 55 or so, what he learned there was put to use in the phase converters. At first he just showed me how to make them, but I wanted to know how they worked. Well the rest is just history. You now know the most basic of what I know about them. There is more tech stuff that dont really help much. But if you know the basics you can figure out systems on your own. This info is meant to be shared and not to show how clever I am. I am sure you are aware of the dangers of high value caps so not much to be said here except that one got me once and blew a large chunk out of the end of my thumb.

PS I t doesnt seem to matter how much we know about these things sometimes we get lucky with them and sometimes we dont, that the way it is with unengineered surplus parts ;((

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scott#2

03-11-2006 10:30:53

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Re: Two pole motors are actually Re:Phase converte in reply to benny2, 03-10-2006 19:34:49

Very interesting Benny, you've had quite a run at these things, I am still learning. I grew up in an electronics whirlwind. Dad was a ham since he was 12, needless to say we had our share of projects over the years. I was building tv's, tube testers, transmitters, receivers, radios, qrp rigs, you name it when I was 8. Dad used to give me small caps to play with back then and I would charge them up, take them to school and let my classmates play with them. Got thrown out of school a few times for that. I remember one day he gave me a schematic and told me to go get the parts out of the junk drawer and rob some old chassis pieces. I put the thing together and hooked a 6v battery to it and a meter long piece of wire for an antenna and he worked a guy in so. africa, morse code. I think I was about 6 then and I was hooked, totaly astounded me. He was quite a guy. Bomber sqardran commander, test pilot, saturn 5 project team leader. I sat on Dr. Werner Von Brauns knee as a kid after he defected from Germany. Knew all the astronauts, even the 3 that burned in Apollo 11. Its tough to live up to or even try to compete with the fine people of thet era, they just dont make them like that anymore. Ive always been a jack and never a master as dad was. Thank God for these forums and the Highly Intelligent and Compentent People that come visit, at times I would be lost without them.

Thanks for the info Benny, Ive printed it out and put in in the converter info file for future reference, I never knew all that about motors.

scott#2

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