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    Shunt-wound motor: Maximum start-up torque

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    (a) A shunt-wound motor set was designed to run from a 250 V d.c. supply. It had an effective armature resistance of 3 m Ohm and when run at 3000 rev/min it drew 10 kA.

    Find:
    (i) The maximum permissible supply voltage at start-up if the motor set is not to draw more than 20 kA when started from rest.
    (ii) The maximum start-up torque available.

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    https://brainmass.com/physics/torques/shunt-wound-motor-maximum-start-up-torque-2090

    Solution Preview

    Please refer to the attached file for the solution.
    I hope it helps.

    Solution for Posting #2090
    Shunt DC Motor
    (a).
    (i). When the motor start from the rest, the speed is zero, i.e., m = 0 ...

    Solution Summary

    The solution is to be used more like guidance. It does not give numerical computation, but just formula wise computation.

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