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As shown in the figure, a DC motor is driven by a voltage source Vs through a resistor R = 2 N. The rotor of the motor comprises five wire turns with dimensions of x = 60 cm and y = 30 cm. The magnetic flux density B exerted on the rotor is assumed to be constant at 40 mT with a uniform direction, as marked in the figure. Although the torque that B imposes on the rotor varies with the angle 0 between the rotor and B, for simplicity, a constant equivalent torque is considered which is assumed to be 64% of the peak torque value. This equivalent torque balances the mechanical load torque, giving a constant speed n of the rotor. In the beginning, I = 5 A and n = 2000 rpm. The energy-conversion efficiency of the motor is 70%. After running for some time, the mechanical load torque increases by 10%. What would the value of n be after the increase of the load? Assume that the voltage across the motor is VM = kw, where k, is a constant. Choose the value that is closest to the answer. B S + VM R Vs I

As shown in the figure, a DC motor is driven by a voltage source Vs through a resistor R = 2 N. The rotor of the motor comprises five wire turns with dimensions of x = 60 cm and y = 30 cm. The magnetic flux density B exerted on the rotor is assumed to be constant at 40 mT with a uniform direction, as marked in the figure. Although the torque that B imposes on the rotor varies with the angle 0 between the rotor and B, for simplicity, a constant equivalent torque is considered which is assumed to be 64% of the peak torque value. This equivalent torque balances the mechanical load torque, giving a constant speed n of the rotor. In the beginning, I = 5 A and n = 2000 rpm. The energy-conversion efficiency of the motor is 70%. After running for some time, the mechanical load torque increases by 10%. What would the value of n be after the increase of the load? Assume that the voltage across the motor is VM = kw, where k, is a constant. Choose the value that is closest to the answer. B S + VM R Vs I

Introductory Circuit Analysis (13th Edition)
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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As shown in the figure, a DC motor is driven by a voltage source Vs through a resistor R = 2 N. The rotor of the motor comprises five wire turns with dimensions of x = 60 cm and y = 30 cm. The magnetic flux density B exerted on the rotor is assumed to be constant at 40 mT with a uniform direction, as marked in the figure. Although the torque that B imposes on the rotor varies with the angle 0 between the rotor and B, for simplicity, a constant equivalent torque is considered which is assumed to be 64% of the peak torque value. This equivalent torque balances the mechanical load torque, giving a constant speed n of the rotor. In the beginning, I = 5 A and n = 2000 rpm. The energy-conversion efficiency of the motor is 70%. After running for some time, the mechanical load torque increases by 10%. What would the value of n be after the increase of the load? Assume that the voltage across the motor is VM = kw, where k, is a constant. Choose the value that is closest to the answer. B S + VM R Vs I
Transcribed Image Text:As shown in the figure, a DC motor is driven by a voltage source Vs through a resistor R = 2 N. The rotor of the motor comprises five wire turns with dimensions of x = 60 cm and y = 30 cm. The magnetic flux density B exerted on the rotor is assumed to be constant at 40 mT with a uniform direction, as marked in the figure. Although the torque that B imposes on the rotor varies with the angle 0 between the rotor and B, for simplicity, a constant equivalent torque is considered which is assumed to be 64% of the peak torque value. This equivalent torque balances the mechanical load torque, giving a constant speed n of the rotor. In the beginning, I = 5 A and n = 2000 rpm. The energy-conversion efficiency of the motor is 70%. After running for some time, the mechanical load torque increases by 10%. What would the value of n be after the increase of the load? Assume that the voltage across the motor is VM = kw, where k, is a constant. Choose the value that is closest to the answer. B S + VM R Vs I
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