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Problem 2: A series connected DC motor needs to provide an output torque of 70 Nm to a load with negligible rotational losses. The motor has resistance values of RA=3 ? and RF=9 ? while the magnetization curve for the motor is shown below where M = 60 V/A and ?m = 100 rad/sec. The voltage applied to the motor, VT, is 200 V. Magnetization Curve EA EA = M ? IF ?m = Speed when Curve Generated IF a) What is the power delivered to the load? (5 points) b) What is the efficiency of the system? (5 points) c) Now a gear box is connected between the 70 Nm load and the motor. The gear box has a ratio of 7 (i.e., torque at load = 7x torque from motor). What is the new power delivered to the load? (5 points)

          Problem 2: A series connected DC motor needs to provide an output torque of 70 Nm to a load with negligible rotational losses. The motor has resistance values of RA=3 ? and RF=9 ? while the magnetization curve for the motor is shown below where M = 60 V/A and ?m = 100 rad/sec. The voltage applied to the motor, VT, is 200 V. Magnetization Curve EA EA = M ? IF ?m = Speed when Curve Generated IF a) What is the power delivered to the load? (5 points) b) What is the efficiency of the system? (5 points) c) Now a gear box is connected between the 70 Nm load and the motor. The gear box has a ratio of 7 (i.e., torque at load = 7x torque from motor). What is the new power delivered to the load? (5 points)

Problem 2: A series connected DC motor needs to provide an output torque of 70 Nm to a load with negligible rotational losses. The motor has resistance values of RA=3 ? and RF=9 ? while the magnetization curve for the motor is shown below where M = 60 V/A and ?m = 100 rad/sec. The voltage applied to the motor, VT, is 200 V. Magnetization Curve EA EA = M ? IF ?m = Speed when Curve Generated IF a) What is the power delivered to the load? (5 points) b) What is the efficiency of the system? (5 points) c) Now a gear box is connected between the 70 Nm load and the motor. The gear box has a ratio of 7 (i.e., torque at load = 7x torque from motor). What is the new power delivered to the load? (5 points)

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