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# A 230V DC shunt motor has the following parameters Ra 05 Q Rf 75 Q Prot 500 W at 1120 rmin When loaded the motor draws 46 A from the line Find a The speed

A 230-V DC shunt motor has the following parameters:

Ra  = 0.Q      Rf   = 75 Q

Prot  = 500 W        at 1,120 r/min

When loaded, the motor draws 46 A from the line. Find

a.    The speed, Pdev, and Tsh.

b.    If L= 25 H, L= 0.008 H, and the terminal voltage has a 115-V change, find ia(t)

and ωm(t).

14.21      A 200-V DC shunt motor with an armature resistance of 0.1 and a field resistance of 100 draws a line current of 5 A when running with no load at 955 r/min. Determine the motor speed, the motor efficiency, the total losses (i.e., rotational and 2R losses), and the load torque Tsh that will result when the motor draws 40 A from the line.  Assume rotational power losses are proportional to the square of shaft speed.

Jun 18 2020 View more View Less