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A 8250 w shunt DC motor has a terminal voltage of 300 V. A field resistance...
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) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field c...
a) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field circuit resistance is 220 Ω; the armature resistance is 0.112, and the series-field resistance is 0.1 Ω, what is the stray power loss ? (b) Assume the input rating of the motor in Part (a) to be 66 A at 220 V with a no-load speed of 1000 rpm. If the stray power loss varies as the counter-electromotive force and...
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...
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...
Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating...
Show all working 1. A 4 pole, 220 V, 10 H.P, d.c. shunt motor is rotating at a speed of 320 rpm. Then the developed useful torque is 2. A 4 pole, lap wound d.c. motor drawing an armature current of 20 A has 360 conductors. If the flux per pole is 0.015 Wb then the gross torque developed by the armature of motor is 3. A 220 V, d.c. motor draws an armature current of 20 A. Its armature...
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...
RedID: Name: Question 3. (18 Marks) A 10-hp, 130V, series dc motor, shown here, has an armature resistance of 0.1 Ω and a series field resistance of also 0.1. The number of turns of series coil N...
RedID: Name: Question 3. (18 Marks) A 10-hp, 130V, series dc motor, shown here, has an armature resistance of 0.1 Ω and a series field resistance of also 0.1. The number of turns of series coil N,-500. At the load 60 A, the speed is 850 r/min. Its magnetization curve is shown below. The core losses are 220 W and the mechanical losses are 230 W at this load. Assume that the mechanical losses vary as the cube of the...
Q2. (10 points) A 10 kW, 100 V, 1000 rpm dc shunt generator has armature resistance...
Q2. (10 points) A 10 kW, 100 V, 1000 rpm dc shunt generator has armature resistance Ra = 0.1.2. The field current generating 100 V at no-load is 1.0 A. The magnetization characteristic at 1000 rpm is shown in figure below. The machine is operated as a separately excited dc generator at 1000 rpm with rated field current. Neglecting the armature reaction effect; (a) Determine full load armature current, la (b) Determine the terminal voltage at full load, with ly...
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.
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) The input current to a 220 V, short-shunt compound motor at no load is 6 A. The shunt- field circuit resistance is 220 Ω; the armature resistance is 0.112, and the series-field resistance is 0.1 Ω, what is the stray power loss ? (b) Assume the input rating of the motor in Part (a) to be 66 A at 220 V with a no-load speed of 1000 rpm. If the stray power loss varies as the counter-electromotive force and...
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...
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...
RedID: Name: Question 3. (18 Marks) A 10-hp, 130V, series dc motor, shown here, has an armature resistance of 0.1 Ω and a series field resistance of also 0.1. The number of turns of series coil N,-500. At the load 60 A, the speed is 850 r/min. Its magnetization curve is shown below. The core losses are 220 W and the mechanical losses are 230 W at this load. Assume that the mechanical losses vary as the cube of the...
Q2. (10 points) A 10 kW, 100 V, 1000 rpm dc shunt generator has armature resistance Ra = 0.1.2. The field current generating 100 V at no-load is 1.0 A. The magnetization characteristic at 1000 rpm is shown in figure below. The machine is operated as a separately excited dc generator at 1000 rpm with rated field current. Neglecting the armature reaction effect; (a) Determine full load armature current, la (b) Determine the terminal voltage at full load, with ly...
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