Question

A DC motor, when supplied from a 211 V power supply is observed to rotate under no-load conditions at 1,700 rpm. A stall test shows that the winding resistance is 1.65 ? The motor is connected to a load whose torque-speed characteristic is given by ? = ?×0.178. Find the speed (in rpm) at which the motor will drive this load. rpm (Give your answer in rpm to 3 s.f.)

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The supply voltage is, V 211 V. And, winding resistance is, R, 1.65 Q No load conditions are, N, no-load1700 rpm The equationAt stalling condition, E 0. Thus V E,+I,R S a 211 0 1(1.65) a I(1.65) 211 211 I 1.65 a - 127.88 A The torque equation is, T K

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