For a 18600W 2400rpm DC motor, the following values are given: Ra=0.089 Q (value at room temperature (250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance values at 1000C.) (Take the rated field winding losses as Wf = 210W.) f the motor speed is reduced to 50% of the rated speed (1200rpm), if the reduction to 50% of the motor speed is achieved by connecting a series resistor (RS) to the inductor, find the serial resistance value, which should be added at the rated inductor voltage, the inductive current, the motor efficiency and the motor speed at no load. When calculating the efficiency, include the losses in RS into the calculations. Rs Ω %3D I A Eff- % ONL- rpm

For a 18600W 2400rpm DC motor, the following values are given: Ra=0.089 Q (value at room temperature (250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance values at 1000C.) (Take the rated field winding losses as Wf = 210W.) f the motor speed is reduced to 50% of the rated speed (1200rpm), if the reduction to 50% of the motor speed is achieved by connecting a series resistor (RS) to the inductor, find the serial resistance value, which should be added at the rated inductor voltage, the inductive current, the motor efficiency and the motor speed at no load. When calculating the efficiency, include the losses in RS into the calculations. Rs Ω %3D I A Eff- % ONL- rpm

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Subject Electrical Machines 2
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For a 18600W 2400rpm DC motor, the following values are given: Ra = 0.089 2 (value at room temperature (250C)), La = 0.00144 H, KT = 0.85 Nm / A and KV = 0.851 V / (rad / s)), (In calculations Use the hot resistance values at 1000C.) (Take the rated field winding losses as Wf= 210W.) If the motor speed is reduced to 50% of the rated speed (1200rpm), find the inductive voltage, the induced current, the motor efficiency and the motor speed at no load to obtain the rated torque at this speed. (Field supply current will be considered constant). I A V V Eff % ONL rpm
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