Homework Answers
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...
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...
Q1 [35] DC shunt motor has the following parameters: 10,1 kW, 150 V, 805 rpm, R=0.212,...
Q1 [35] DC shunt motor has the following parameters: 10,1 kW, 150 V, 805 rpm, R=0.212, R=200 2. When the motor is not loaded it draws 10 A from the voltage source of 150 V. a) [10]Calculate the efficiency at full load, rotating at 805 rpm. b) [10] Calculate the torque when there is no load on the rotor. c) [15] If total torque on the rotor is 91 Nm, calculate the control resistance of the armature to set the...
Please, consider this as a single question, and answer it if possible. Any help will be...
Please, consider this as a single question, and
answer it if possible. Any help will be rated for
sure.
The DC machine, which has the armature resistance Ra=0.12, shunt field winding resistance Rfw=8022 and control rheostat (Rfc), is connected to a 100V DC power supply and operated at a DC shunt motor. At no-load condition, the motor runs at 1000rpm and armature takes 6A. The magnetization curve of the machine at 1000rpm is shown in the Fig. 1. 120 ,...
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) 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...
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
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...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
Q1: (30 points) A shunt DC generator, running at a constant speed of 1400 rpm, has...
Q1: (30 points) A shunt DC generator, running at a constant speed of 1400 rpm, has a field resistance of 200 22 and armature resistance of 0.5 12. Ignore armature reaction and assume a 400 W rotational loss. a) [15] While supplying no load, the induced armature voltage is 280 V. Calculate the input power. b) [15] When the generator is loaded, the developed power is found to be 4.1 kW at the same magnetic flux of the field found...
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...
Q1 [35] DC shunt motor has the following parameters: 10,1 kW, 150 V, 805 rpm, R=0.212, R=200 2. When the motor is not loaded it draws 10 A from the voltage source of 150 V. a) [10]Calculate the efficiency at full load, rotating at 805 rpm. b) [10] Calculate the torque when there is no load on the rotor. c) [15] If total torque on the rotor is 91 Nm, calculate the control resistance of the armature to set the...
Please, consider this as a single question, and
answer it if possible. Any help will be rated for
sure.
The DC machine, which has the armature resistance Ra=0.12, shunt field winding resistance Rfw=8022 and control rheostat (Rfc), is connected to a 100V DC power supply and operated at a DC shunt motor. At no-load condition, the motor runs at 1000rpm and armature takes 6A. The magnetization curve of the machine at 1000rpm is shown in the Fig. 1. 120 ,...
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...
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...
3) The armature of a permanent-magnet dc motor has a resistance of 0.72 and draws a current of 50 A when the speed is 1500 r/min when the armature is connected to a source of 48 V, calculate the following: a) The induced emf, EA, and the torque, T, produced at this speed. b) The motor speed, n (in rpm), when the torque is 2 Nm. c) The armature current at 1600 r/min. d) The torque at 1600 r/min. e)...
Q1: (30 points) A shunt DC generator, running at a constant speed of 1400 rpm, has a field resistance of 200 22 and armature resistance of 0.5 12. Ignore armature reaction and assume a 400 W rotational loss. a) [15] While supplying no load, the induced armature voltage is 280 V. Calculate the input power. b) [15] When the generator is loaded, the developed power is found to be 4.1 kW at the same magnetic flux of the field found...
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