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‏The speed of a 11 KW, 150 V, 1300 rev/min separately excited DC motor is controlled...

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Electrical Engineering

‏The speed of a 11 KW, 150 V, 1300 rev/min separately excitedDC motor is controlled by a
‏single-phase fully-controlled thyristor converter. The ratedmotor current is 25 A, and the
‏armature resistance is Ra = 0.5 Ohm. The ac supply is 160 V.The motor voltage constant KE =
‏0.182 V/rev/min. Assume that sufficient inductance is presentin the armature circuit to make
‏the armature current continuous and ripple free.
‏For a firing angle of alpha = 20 degree and rated motorcurrent, calculate:
‏(a) The motor torque
‏(b) The supply power factor

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