Hey there Sign in to join this conversationNew here? Join for free

DC motors. Any electircal engineers or physics guys that can help?

Announcements Posted on
Study Help needs new mods! 14-04-2014
Post on TSR and win a prize! Find out more... 10-04-2014
    • Thread Starter

    Anyone know how to start this one off. Lost all my notes on dc motors.

    Q) A 240V dc shunt motor has an armature and field resistance of 0.2 ohms and 320 ohms respectively. The motor drives a load at a speed of 950 rev/min and the armature current is 50A. Assuming that the flux is directly proportional to the field current, calculate the additional resistance necessary in the field circuit to increase the speed to 1100 rev/min while maintaining the armature current constant.
    • Thread Starter

    Really, no one in the whole of tsr know?


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?

    this is what you'll be called on TSR

  2. this can't be left blank
    this email is already registered. Forgotten your password?

    never shared and never spammed

  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By completing the slider below you agree to The Student Room's terms & conditions and site rules

  2. Slide the button to the right to create your account

    Slide to join now Processing…

    You don't slide that way? No problem.

Updated: April 4, 2012
Article updates
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.