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January 3rd 04, 07:06 AM
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Bill wrote in message ...
wrote: In sci.electronics.basics Rob Paisley wrote: | For larger horsepower motors, Three Phases means that they will | start with no external mechanical assistance. And, as I understand it, they can then "stand on one leg" although they will be a bit "shaky". You can also reverse the rotation by swapping two of the phases. If one phase is blown you can start it by giving it a spin in the right direction, 'without' getting your hand caught Bill Baka I am not sure if a 3 phase motor would even rotate unloaded on 2 phases but it certainly would not develop a usable amount of horsepower. I would suspect that running on 1 phase would be out of the question. I do know that if a loaded 3 phase motor blows a fuse it will almost always blow a fuse in one of the other lines due to an overload. Due to the way the control power for the motor is connected the starter will then open the circuit if it did not already do so when the first fuse failed. Also, there is a number of 1.57 being bandied about in this thread for the relative horse power of a 3 phase versus single motor for a given current. This number should be 1.73 (The square root of 3. Rob. |
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