Calculate the force exerted by each conductor, 6 in long, on the armature of a DC motor when it carries a current of 90 A and lies in a field the density of which is 5.2 × 10?4 Wb/in2.

Find:
The motor speed, the motor efficiency, total losses, and the load torque when the motor draws from the line.
Assumptions:
Rotational power losses are proportional to the square of shaft speed.


Analysis:

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