Calculate what is the rated armature current

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Reference no: EM13226456

A dc machine is rated 5 hp with V_f = 240 V, V_a = 240 V, r_a = 0.63 ohms, and L_AF = 1.8 H. At rated condtions w_r = 127.7 rads/s and the total resistance of the field circuit is 240 ohms.

a) Calculate the rated armature current. The machine is to be operated in the constant-power mode beyond rated speed.

b) Calculate I_f at four times rated speed.

c) Calculate the boundary value of T_e for part b.

Reference no: EM13226456

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