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Shearer haulage drive question

Shearer haulage drive question

Shearer haulage drive question

(OP)
I'm in the middle of conducting a load analysis on a haulage pinion off a shearer and am attempting to figure out the torque the pinion is required to transmit.
Part of the information I've been given is that there are two motor & gear assemblies which both drive off a common rack. Both of the drives are attached to the same shearer. I've been told that the total amount of power available is 70Kw and that both of the motors are 35Kw and connected in series and powered by the same drive.
I don't know a great deal about DC motors or electrical circuits, but I'm having a problem understanding the information I've been given as I am under the assumption that two equal loads in series yields a total system power of half of one of the loads, or in this case 17.5Kw. For the system to be rated at 70Kw the two equal loads would have to be set up in a parallel configuration.
Would someone please explain the correct way of looking at this problem?
I have confronted the Electrical Engineer responsible for the system and he has assured me that what I'm saying is incorrect.
 

Ron Volmershausen
Brunkerville Engineering
Newcastle Australia
http://www.aussieweb.com.au/email.aspx?id=1194181
 

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