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Problem 3: DC machine A shunt DC motor rated at V,'. 300 V, with field resistance...
Problem 3: DC machine A shunt DC motor rated at V,'. 300 V, with field resistance of Rf 600 0, armature 0.2 , resistance of R, 30.5 A (total current) when rated-load at n, consumes 916.8 rpm. Armature rotational loss (consisting of fan, friction and core loss (consisting of field resistance, armature a) Find Prot (rotational load), Pshaft and efficiency at rated load. - Assume that the rotational loss is constant and P,aft is now 50% in the case of...
A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance...
A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance Rf of 40 Ω, and an armature resistance Ra of 250 mm2. The field winding has 1500 turns. An adjustable resistance Rad is connected in series to the field winding. Rad is set at 20 Ω, but it can vary from 0 to 80 Ω. The magnetization curve is shown in Figure.1 and it is taken at a speed of 1200 rpm. (Armature reaction...
T u resistance in a DC is decreased while the motor is driving a ii. A...
T u resistance in a DC is decreased while the motor is driving a ii. A 100-hp, 250-V DC shunt motor with compensating winding has an am 0.04 12 and a variable shunt field resistance R; 92. The magn ompensating winding has an armature resistance of shunt field resistance R, 12. The magnetization curve of this motor is shown in Fig. 1. At no load, the field resistor has been a . At no load, the field resistor has been...
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.
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an...
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an armature resistance of 0.1 ohm, is delivering 80 % of rated power to the mains at rated voltage when being run at 1000 r.p.m. (revolutions per minute). The field circuit resistance is 220 ohms. The brush contact drop is 0.5 V and rotational (mechanical) losses are 750 W Calculate The induced voltage The electromagnetic torque developed The shaft torque The overall efficiency B) (15...
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω...
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω and shunt field resistance 100 Ω. The rotational losses are 200 W. On full load the line current is 25 A and the motor runs at 1800 rpm. Determine: (i) the developed mechanical power (ii) the output power (iii) the output torque (iv) the efficiency at full load 2. A 120 V series motor has 0.2 Ω field resistance. On full load, the line...
1. Name the various parts of a DC machine and give their function. 2. A four-pole...
1. Name the various parts of a DC machine and give their function. 2. A four-pole de machine with a lap wound armature has a total of 652 armature conductors with an armature resistance of 0.1502. When run as a generator on open circuit at a speed of 400rpm, the armature terminal voltage is 262V. Each pole shoe arc has a diameter of 42cm, subtends an angle of 60° and has an axial length of 20cm. 2.1.Calculate the useful flux...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve as shown in Figure 1. The armature resistance is 0.189 and the field resistance is 2002 with and adjustable field resistance of 0 to 4002. The shunt de motor has rated line current of 50A when supplying rated voltage. (a) Determine the value of the adjustable field resistance so that the motor operates at no- load speed of 1200 r/min. [5 marks] (b) Assuming...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor with an armature resistance of 0.04 Q and a field resistance of 50 Q. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The moter is driving a load toque that is proportional with speed, Ti a (n). The motor is driving a load with a line current of 80 A and an initial...
Problem 3: DC machine A shunt DC motor rated at V,'. 300 V, with field resistance of Rf 600 0, armature 0.2 , resistance of R, 30.5 A (total current) when rated-load at n, consumes 916.8 rpm. Armature rotational loss (consisting of fan, friction and core loss (consisting of field resistance, armature a) Find Prot (rotational load), Pshaft and efficiency at rated load. - Assume that the rotational loss is constant and P,aft is now 50% in the case of...
A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance Rf of 40 Ω, and an armature resistance Ra of 250 mm2. The field winding has 1500 turns. An adjustable resistance Rad is connected in series to the field winding. Rad is set at 20 Ω, but it can vary from 0 to 80 Ω. The magnetization curve is shown in Figure.1 and it is taken at a speed of 1200 rpm. (Armature reaction...
T u resistance in a DC is decreased while the motor is driving a ii. A 100-hp, 250-V DC shunt motor with compensating winding has an am 0.04 12 and a variable shunt field resistance R; 92. The magn ompensating winding has an armature resistance of shunt field resistance R, 12. The magnetization curve of this motor is shown in Fig. 1. At no load, the field resistor has been a . At no load, the field resistor has been...
QUESTION 1 A) (10 marks) A 10 kW, 250 V DC self-excited shunt generator, with an armature resistance of 0.1 ohm, is delivering 80 % of rated power to the mains at rated voltage when being run at 1000 r.p.m. (revolutions per minute). The field circuit resistance is 220 ohms. The brush contact drop is 0.5 V and rotational (mechanical) losses are 750 W Calculate The induced voltage The electromagnetic torque developed The shaft torque The overall efficiency B) (15...
1. Name the various parts of a DC machine and give their function. 2. A four-pole de machine with a lap wound armature has a total of 652 armature conductors with an armature resistance of 0.1502. When run as a generator on open circuit at a speed of 400rpm, the armature terminal voltage is 262V. Each pole shoe arc has a diameter of 42cm, subtends an angle of 60° and has an axial length of 20cm. 2.1.Calculate the useful flux...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve as shown in Figure 1. The armature resistance is 0.189 and the field resistance is 2002 with and adjustable field resistance of 0 to 4002. The shunt de motor has rated line current of 50A when supplying rated voltage. (a) Determine the value of the adjustable field resistance so that the motor operates at no- load speed of 1200 r/min. [5 marks] (b) Assuming...
Question (3) Speed Control [10 Marks A 50 hp, 220 V, 1500 rpm DC shunt motor with an armature resistance of 0.04 Q and a field resistance of 50 Q. The motor has compensating windings, so armature reactance can be ignored. Mechanical and core losses may be ignored also. The moter is driving a load toque that is proportional with speed, Ti a (n). The motor is driving a load with a line current of 80 A and an initial...
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