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It is required to design a low-voltage, high-current, shunt-excited DC motor for hoisting drive in industrial overhead crane system. The output power of the machine is expected to be between (20+X) hp. The copper losses in the machine should be between 4% and 7% of the output power. The brush losses in the machine should be between 2% and 5% of the copper losses. The no load power should not exceed 6% of the output power. The motor speed is available between 900 and 1200 rpm. The supply voltage is 240V. The brush voltage drop is 2V each. The magnetization curve is linear and given as ? (Wb) =0.025x (A). The flux per pole should not exceed 25 mWb. The number of poles is up to 8 poles. The armature resistance is between (0.05 to 0.12) ?.
Explain all your design steps and give all the machine parameters and variables (speed, armature current, armature voltage).
Assume any missing data and tabulate them in your report. (Note that "X" is your serial number, e.g., 01, 02, 10, 12, 20, ..etc.)
A 1m-long metal cylinder of 25cm radius is heated such that the axial temperature distribution at a certain instant of time is T(z)=a+bz+cz2 where a=900K, b=-500K/m and c=150K/m2 . What is the rate of energy change of the cylinder at this instant if ..
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