Hello,(adsbygoogle = window.adsbygoogle || []).push({});

I would like to know if the motor efficiency is changing with respect to applied voltage or it doesn't change. What I do mean. The efficiency=(V*I)/(Torque*velocity) and the power losses= I^2*R. Can I say that

mechanical power ( Torque*speed)=V*I-I^2*R

If so, can I say that the efficiency is not constant with torque and current changing?

Also, the torque is function in current

T=(motor constant*current)=km*I

What about the efficiency? Does the efficiency effect on the motor performance? Can I say

T=efficiency*motor constant*current

Many thanks

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# DC motor efficiency

Loading...

Similar Threads for motor efficiency | Date |
---|---|

How to calculate large DC motor efficiency? | May 10, 2017 |

If you put a noisy motor in a vacuum is it more efficient? | Dec 19, 2016 |

What would be the most efficient 1kw motor to use at low RPM | May 29, 2016 |

Is it Possible to get over 90% efficiency from a servo motor | May 29, 2016 |

Why efficiency of induction motor is low for low HP? | Mar 5, 2016 |

**Physics Forums - The Fusion of Science and Community**