Motor Efficiency: Understand Why 0.85 Matters

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SUMMARY

The discussion centers on the calculation of motor power efficiency, specifically addressing the formula P=F*v, where P represents motor output. The confusion arises from the efficiency of sprockets, which is 85%. The correct approach is to divide the final output power by 0.85 to determine the motor's input power, rather than multiplying by 0.85. This method accurately reflects the relationship between input and output power in systems with efficiency losses.

PREREQUISITES
  • Understanding of basic physics principles, particularly power calculations.
  • Familiarity with mechanical efficiency concepts.
  • Knowledge of motor performance metrics.
  • Experience with formulas involving force and velocity.
NEXT STEPS
  • Research the concept of mechanical efficiency and its impact on power calculations.
  • Learn about the relationship between input and output power in motor systems.
  • Explore the implications of efficiency ratings in mechanical systems.
  • Study the effects of sprocket systems on overall motor performance.
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Engineers, mechanical designers, and students studying motor efficiency and power calculations will benefit from this discussion.

TSN79
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In an assigment I'm using the general formula P=F*v, where P is the effect of a motor. The motor drives something through a series of sprockets, who's efficiency is 85 %, and so it seems intuitive to me to multiply the resulting P with 0,85 to get true effect, but apparently the solution divides by 0,85 which results in a higher P than to begin with. I don't get the logic in this, so if someone can explain why this is correct I would like to hear it.
 
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What's the question?
Could it be that you're given the final output power (that is, after the sprockets), and asked the power of the motor?
 

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