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| Re: The LIRR President Speaks (245222) | |||
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Re: The LIRR President Speaks |
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Posted by Train Dude on Mon Apr 24 09:55:31 2006, in response to Re: The LIRR President Speaks, posted by RonInBayside on Mon Apr 24 01:32:00 2006. In the first two points of power all 4 traction motors are in series with varying amounts of resistance in the circuit to control motor speed. These are known as "switching" & "series". At the end of series, when all resistance has been 'stepped' out of the circuit, the controller reconfigures the motors so that the 2 traction motors on each truck remain in series, both trucks are now in a parallel configuration. Simply put, with a 600 VDC 3rd rail, in series, the most any traction motor will see is 150 VDC. When in parallel, that obviously becomes 300VDC. The results should be obvious.BTW: This is moot when dealing with AC traction since each truck has its' own inverter on NYCT cars. the configuration never changes. LIRR DE/DM30AC locos have one inverter per traction motor. I am not aware of the configuration of the M-7s as yet. |
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