Load distribution of DC motors.
Load distribution of DC motors.
(OP)
This may be for another forum but it would be interesting to hear from someone that frequents the gear & pulley forum.
I'm in the middle of conducting a load analysis of a gear pair for a customer and am attempting to figure out the torque the gears are 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 mechanism. 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.
I'm in the middle of conducting a load analysis of a gear pair for a customer and am attempting to figure out the torque the gears are 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 mechanism. 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





RE: Load distribution of DC motors.
Don
Kansas City
RE: Load distribution of DC motors.
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RE: Load distribution of DC motors.
D.C. motors are great for variable speed drives because current increases rapidly when load increases and tries to slow the motor. Thus the motor speed stays fairly constant with constant supply voltage. But two motors are not identical enough to share load when in parallel electrically.
RE: Load distribution of DC motors.