Conservation of Power in the armature circuit of a DC motor

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Homework Help Overview

The discussion revolves around the conservation of power in the armature circuit of a DC motor, specifically in the context of a lab report. The original poster is exploring the concept of power conservation and the factors affecting energy loss in the motor, particularly focusing on Armature Copper Loss.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the sources of energy loss in a DC motor and questions whether there are additional factors beyond Armature Copper Loss. They seek clarification on the relationship between power conservation and the armature circuit.
  • Some participants inquire about the specifics of the motor used and the method of increasing load, suggesting that further details are necessary for a comprehensive analysis.
  • Others note the linear relationship observed between motor speed and load torque in the simulation, questioning the validity of the results given the absence of losses.

Discussion Status

The discussion is ongoing, with participants seeking additional information to clarify the context of the original poster's data. There is an acknowledgment of the simulation nature of the results, and some guidance has been offered regarding the need for more detailed parameters such as motor voltage and current measurements.

Contextual Notes

The original poster mentions that the data comes from simulations conducted in Matlab, where the load was increased incrementally. There is a lack of specification regarding the motor model, which may affect the interpretation of the results.

Cocoleia
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Homework Statement


I am asked in a lab report to explain the conservation of power in the armature circuit of the DC motor.

Homework Equations


This is the data I have acquired:
upload_2017-10-15_14-58-33.png


The Attempt at a Solution


I have been reading around, and I have learned somewhat about the Armature Copper Loss. I am saying that this is one part of the energy that is lost in a DC motor. Is there any other source ? Is there a power conservation relation or equation for the armature circuit of a DC motor ? I mean, from looking at the data you can only see that as expected with a higher load you need more power. I don't know how to study the conservation of power of the armature circuit with this data ...

Thanks
 
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You need to provide more information.

From the data you've obtained, it appears that the speed of your motor is increasing linearly with increase in load torque.
Which motor is it? How are you increasing the speed?
 
cnh1995 said:
You need to provide more information.

From the data you've obtained, it appears that the speed of your motor is increasing linearly with increase in load torque.
Which motor is it? How are you increasing the speed?
This was all simulations done on Matlab. I just increased the load by 50 each time. It's a DC motor, I don't think they specified any type of model or anything
 
This surely is a simulation result, because the speed increases very linearly with the load and the losses are zero. Did you set the value(s) for motor voltage and record the current?
 

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