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Problem 6: A 230-V shunt motor has an armature resistance of 0.05 Ohms and a field resistance of 75 Ohms. The motor draws 7 A of line current while running light at 1120 rpm. The line current at a...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
1. A shunt machine, while running as a generator, has an induced voltage of 260 V...
1. A shunt machine, while running as a generator, has an induced voltage of 260 V at 1200 rpm. Its armature and field resistances are 0.2 2 and 110 Q, respectively. If the machine is run as a shunt motor, it takes 4 A at 220 V (i) Draw the schematic diagram of the machine as a generator. (ii) Draw the schematic diagram of the machine as a motor (iii)At a certain load the motor takes 30 A at 220...
220 v dc shunt motor has Ra= 0.25 ohms and Rf=120 ohms . At no-load the...
220 v dc shunt motor has Ra= 0.25 ohms and Rf=120 ohms . At no-load the motor draws a current It=6A. And runs at 1500 rpm. At full-load the motor draws 62 A. the armature reaction at full load reduces the flux by 10%. Determine the rotational losses , motor speed at full-load, the shaft torque and efficiency.
A 250 V DC shunt motor has an armature resistance of 0.25 ohms and a variable...
A 250 V DC shunt motor has an armature resistance of 0.25 ohms and a variable field resistance. At a certain loading condition, the motor’s generated (induced) voltage is 245 V. Find what will be the motor’s new armature current when there is 1% decrease in the flux value?
A d.c shunt motor has armature and field resistance of 0.2 Ω and 110 Ω respectively....
A d.c shunt motor has armature and field resistance of 0.2 Ω and 110 Ω respectively. The motor is running at 1200 rpm and drawing 15 A from 110 V supply. If the field resistance is decreased by 10%, calculate the new steady state armature current and speed of the motor. Assume the load torque to be constant
A d.c shunt motor has armature and field resistance of 0.2 Ω and 110 Ω respectively....
A d.c shunt motor has armature and field resistance of 0.2 Ω and 110 Ω respectively. The motor is running at 1200 rpm and drawing 15 A from 110 V supply. If the field resistance is decreased by 10%, calculate the new steady state armature current and speed of the motor. Assume the load torque to be constant.
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor h...
A 6 hp, 180 V shunt dc motor draws a full-load current of 30 A from the power supply. The motor has a field (shunt) resistance of 150 Ω. The armature resistance of the motor is 0.1 Ω. When the motor speed is 1800 rpm (this is not the full-load speed), the relationship between the induced voltage
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any...
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any external load. When the motor is connected to an external load, it draws a line current of 40A. The motor has an armature resistance of 1 ? and a field circuit resistance of 100 ?. Assume that the rotational loss torque is 2 Nm and is independent of the speed (a) Find the line current of the motor when there is no external load....
A 230 V shunt direct-current machine on no-load has a speed of 900 rpm and a supply current of 2.5 A. The machine parameters are: • Field resistance: 230 Ω • Armature resistance: 0.3 Ω • Voltage drop/...
A 230 V shunt direct-current machine on no-load has a speed of 900 rpm and a supply current of 2.5 A. The machine parameters are: • Field resistance: 230 Ω • Armature resistance: 0.3 Ω • Voltage drop/brush: 1.0 V (current independent) a) Calculate the electromagnetic torque, speed, the output power and the overall efficiency when the supply current is 35 A, assuming that the friction and wind-age torque is constant. (16 points) b) The machine operates now as generator...
3. A 25-kW, 230-V shunt motor has an armature resistance of 0.064 Ω and a field-circuit...
3. A 25-kW, 230-V shunt motor has an armature resistance of 0.064 Ω and a field-circuit resistance of 95 Ω. The motor delivers rated output power at rated voltage when its armature current is 122 A. When the motor is operating at rated voltage, the speed is observed to be 1150 r/min when the machine is loaded such that the armature current is 69.5 A a. Calculate the rated-load speed of this motor In order to protect both the motor...
03 (5pts): A 250-V shunt motor has an armature resistance of 0.25 Ohms and a field resistance of 125 Ohms. At no-load the motor takes a line current of 5.0 A while running at 1200 rpm. If the line current at full-load is 62.0 A, what is the full-load speed? When the line current is 62 A, the field resistance is increased to 200 Ohms, what is the new speed of the motor?
1. A shunt machine, while running as a generator, has an induced voltage of 260 V at 1200 rpm. Its armature and field resistances are 0.2 2 and 110 Q, respectively. If the machine is run as a shunt motor, it takes 4 A at 220 V (i) Draw the schematic diagram of the machine as a generator. (ii) Draw the schematic diagram of the machine as a motor (iii)At a certain load the motor takes 30 A at 220...
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any external load. When the motor is connected to an external load, it draws a line current of 40A. The motor has an armature resistance of 1 ? and a field circuit resistance of 100 ?. Assume that the rotational loss torque is 2 Nm and is independent of the speed (a) Find the line current of the motor when there is no external load....
3. A 25-kW, 230-V shunt motor has an armature resistance of 0.064 Ω and a field-circuit resistance of 95 Ω. The motor delivers rated output power at rated voltage when its armature current is 122 A. When the motor is operating at rated voltage, the speed is observed to be 1150 r/min when the machine is loaded such that the armature current is 69.5 A a. Calculate the rated-load speed of this motor In order to protect both the motor...
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