1 - Given a shunt connected dc-motor with the parameters listed in Table 1. Also shown below is another table describing

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1 Given A Shunt Connected Dc Motor With The Parameters Listed In Table 1 Also Shown Below Is Another Table Describing 1 (36.65 KiB) Viewed 68 times

1 Given A Shunt Connected Dc Motor With The Parameters Listed In Table 1 Also Shown Below Is Another Table Describing 2 (19.6 KiB) Viewed 68 times

1 Given A Shunt Connected Dc Motor With The Parameters Listed In Table 1 Also Shown Below Is Another Table Describing 3 (20.33 KiB) Viewed 68 times

1 - Given a shunt connected dc-motor with the parameters listed in Table 1. Also shown below is another table describing the back-emf as a function of field current. Note that these measurements were obtained while the rotor rotating at 1200 rpm. Table 1 : Shunt dc-machine parameters Parameter Value Terminal Voltage 240 V Rated Power 22.4 kW Rated Line Current 110 A 0.2 ohms 70 ohms 100 to 400 ohms It Ro RA Rodi Table 2 : Back-emf versus field current at rotor speed = 1200 rpm I(A) E.(V) 0 20 0.1 37.5 0.2 55 0.3 72.5 0.4 90 107.5 0.6 125 0.7 142.5 0.8 160 0.9 177.5 1 195 0.5

a- If no-load is connected to the motor, and the applied terminal voltage is equal to 240 V, and if the adjustable resistor value is chosen at 196 ohms, find the new motor speed. (10 points) 16 22.5 pm pm b- If the motor supplies rated power with the same terminal voltage of 240 V and same adjustable resistor value, what is the speed of the motor (5 points)

rpm 0434.6c- If the motor supplies rated power with the same terminal voltage of 240 V, but now the adjustable resistor is changed from 196 ohms to 400 71,93.66 ohms, find the new speed of the motor (5 points) 5 d- Find the torque for parts a- to C- (5 points) es If the terminal voltage is increased while fixing the adjustable resistance value, will the speed of the motor increase or decrease ? (5 points) 1