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| Re: R156 Locomotives (1154318) | |||
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Re: R156 Locomotives |
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Posted by Rockparkman on Wed May 2 20:08:22 2012, in response to Re: R156 Locomotives, posted by Jace on Wed May 2 09:07:16 2012. The R77Es are very interesting machines. Since they have GE763 motors which operate on a maximum of 300 volts, the 650 volt third rail current has to be reduced in voltage. This is accomplished by using two GE752 (road unit) motors mechanically coupled to form a rotary converter. voltage is easily controlled by modulating the excitation voltage applied to the field (connections F and FF) of the driven 752 and taking the output from the Armature of that motor (A,AA) This current is used to operate thwe locomotive. |
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