Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
DC motor question, help needed?
A 230V, 1KW , 4.34A motor with an armature resistance of 1 ohm. When supplied at 230V the unloaded motor runs at 900RPM, drawing a current of 0.6A. If the motor is run at 120V, calculate the approx no load speed and the accurate no load speed with bearing losses.
Thanks!
1 Answer
- Anonymous9 years agoFavorite Answer
The speed of a DC motor is dependant on voltage.
At roughly half the voltage it will run at roughly half the speed. It will be proportional.
No load speed, taking losses into account will depend on the % loss, Friction, windage and copper.