How can I calculate the efficiency of a DC motor for different torque values?

AI Thread Summary
To calculate the efficiency of a DC motor at various torque values, it is essential to understand the relationship between torque, speed, and power. The maximum efficiency typically occurs at about 20-30% of stall torque and 70-80% of no-load speed. Specific formulas for efficiency calculation may vary, but they generally involve comparing output power to input power at different operational points. Factors such as friction, temperature, and electrical losses also significantly influence efficiency. Further research and experimentation may be necessary to refine the model and obtain accurate efficiency calculations.
Timeforheroes0
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Hi,

I'm attempting to make a model of a DC motor capable of calculating the efficiency of the motor for different values for torque. I have managed to make a code to generate the torque-speed-power plots for given inputs, however I have been unable to figure out how to calculate the efficiency at different points along the graph.
I know that generally speaking there maximum efficiency is roughly 20-30% of the stall torque and 70-80% of the no load speed. But is there any specific formulae for this? I am also aware there are many different things affecting the efficiency so this may not be so simple.

Thanks for any help!
 
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