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| Re: GM10B (Re: Early Conrail) (678126) | |||
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Re: GM10B (Re: Early Conrail) |
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Posted by WillD on Sun Sep 7 23:16:07 2008, in response to GM10B (Re: Early Conrail), posted by timz2 on Sun Sep 7 22:37:26 2008. I am actually not certain now, other folks here have stated that the GM10B was an AC traction locomotive, but I'm not sure that was correct. First of all I believe I am muddling up the term induction motor with something else. Wikipedia says the GM10B had ASEA LJH108-3. According to this forum posting the RC series of locomotives and their export models (other than the AEM7 and ALP44) used ASEA LJH108-1, -2, and -6 through -10. Since the RC1,2,3,4, etc, locomotives used thyristors to rectify AC into DC for their traction motors the LJH108 would have to be a DC motor. According to the same posting the LJH108-3 and -4 were larger motors with bigger cores, presumably for applications like the GM10B. It seems somewhat unlikely that the same basic designation would be used for an AC version of an otherwise DC motor, but then I think the GG1's GEA-627-A1 motors were essentially universal motors. Given that the GM10B was designed to work on a variety of power sources between 12.5 and 50kv, and with frequencies between 25 and 60hz it seems likely that there was a full rectification system in it and that it was DC traction, not the older "PRR-style" AC traction system.But in reference to what you said: no, the AC motors of the GG1 and perhaps the GM10B bear no resemblance to those used on current AC motors. The motors in the GG1, P5, and other PRR electrics used a series of commutators or slip rings to power the motor's rotor while the permanent magnets remained fixed on the housing. Today's AC traction locomotives rectify AC power from the wire into DC, then invert it again into AC power with a square or sine wave of a variable frequency. The permanent magnets are attached to the rotor and thus the rotor does not need to be powered and there's no need for a commutator, slip rings, or any other rotary power transmission system. More on modern AC traction systems: http://www.railway-technical.com/tract-02.shtml A discussion of the GG1's motors: http://railroad.net/forums/viewtopic.php?f=96&t=49987 More on the GG1's motors: http://members.localnet.com/~docsteve/railroad/gg1.htm And if anyone else has some better info then please, please correct me. |
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