1) A DC shunt motor has Ka = 181_m Kf = 10_WB / A Ra =...
1) A DC shunt motor has Ka = 181_m Kf = 10_WB / A Ra = 18_mOhm and Rf = 91_Ohm. For Vt = 11 and T = 3__Nm find the armature current.
A) 13.71_A
B) 15.76_A
C) 9.598_A
D) 17.82_A
2) A DC shunt motor has Ka = 184_m Kf = 9_WB / A Ra = 19_mOhm and Rf = 105_Ohm. For Vt = 12 and T = 3__Nm find output power.
A) .2485_hp
B) .3231_hp
C) .1740_hp
D) .3604_hp
3) A DC shunt motor has Ka = 169_m Kf = 10_WB / A Ra = 13_mOhm and Rf = 109_Ohm. For Vt = 11 and T = 2__Nm find motor efficiency.
A) 83.82_%
B) 69.02_%
C) 98.61_%
D) 113.4_%
Homework Answers
FOR THIRD QUESTION NONE OF THE
OPTIONS SEEMS TO BE RIGHT. I HAVE TRIED IT SEVERAL TIMES. THANK
YOU
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.
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 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100...
A 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100 12, and negligible rotational losses. Under certain load conditions, the shunt motor runs at 1600 rpm while drawing a total current, I = 100 A. Determine: a. the output power of the motor; b. the output torque in N-m; and, c. the efficiency Without making any changes to the applied voltage or the field, the motor operates with a new M mechanical load that...
The power input to a dc shunt motor during rated-load conditions is 100 W. The rotor...
The power input to a dc shunt motor during rated-load conditions
is 100 W. The rotor speed is 2000 r/min, and the armature voltage
is 100 V. The armature resistance is 2? and Rf = 200 ?. Calculate
the no-load rotor speed.
2. The power input to a dc shunt motor during rated-load conditions is 100W. The rotor speed is 2000r/min, and the armature voltage is 100V. The armature resis- tance is 2 Ω and Rf-200Ω. Calculate the no-load rotor...
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...
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be...
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the field so that the motor runs at 950rpm when taking an armature current of 20A. The field resistance is 1600 and armature resistance is 0.40. Assume that the pole flux is proportional to the field current Additional Rf=
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
5.2. (15 pt.) A shunt DC motor has the following characteristics Prated 30 hp, Vt =...
5.2. (15 pt.) A shunt DC motor has the following characteristics Prated 30 hp, Vt = 240 V; nated 1200 rpm Ra-0.19 Ω; Rs 0.02 2; Rotational losses at full load 3550 W rated= 110 A NF 2700 tums per pole NSE 12 turns per pole Radj 100 to 400 Ω 320 Speed = 1200 r/min 240 き 200 180 3 160 140 120 100 0 0. 0.2 0.3 04 0.5 0.6 0.7 0.8 0.9 1.0 1. 2 13 1.4...
A shunt connected DC motor has independent control over armature and field c The motor ratings...
A shunt connected DC motor has independent control over armature and field c The motor ratings are P watts, n RPM, Ia armature amperes, V volts on the armature, and Ir field amperes. Assuming a linear magnetic structure and ignoring all losses (resistance, windage and friction) complete the following table. Show your calculations Field Current VoltageArmatureSpeed Current Torque Power Ratings Case l Case 2 Case 3 ½la 2 1r
A DC 220V shunt motor draws a no load current of 3.5A.Its armature and shunt resistances...
A DC 220V shunt motor draws a no load current of 3.5A.Its armature and shunt resistances are: 0.25 and 440 ohms. At full load it draws a current of 65.5 A . Find the efficiency of machine at full load. pleas SHOW ALL WORK... i really need to learn it THANKS
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 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100 12, and negligible rotational losses. Under certain load conditions, the shunt motor runs at 1600 rpm while drawing a total current, I = 100 A. Determine: a. the output power of the motor; b. the output torque in N-m; and, c. the efficiency Without making any changes to the applied voltage or the field, the motor operates with a new M mechanical load that...
The power input to a dc shunt motor during rated-load conditions
is 100 W. The rotor speed is 2000 r/min, and the armature voltage
is 100 V. The armature resistance is 2? and Rf = 200 ?. Calculate
the no-load rotor speed.
2. The power input to a dc shunt motor during rated-load conditions is 100W. The rotor speed is 2000r/min, and the armature voltage is 100V. The armature resis- tance is 2 Ω and Rf-200Ω. Calculate the no-load rotor...
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...
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the field so that the motor runs at 950rpm when taking an armature current of 20A. The field resistance is 1600 and armature resistance is 0.40. Assume that the pole flux is proportional to the field current Additional Rf=
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the...
MESB443, Semester 1 2018/19 QUESTION 3 [10 marks) A 200V DC shunt motor develops a rated output power of Shp at 1000rpm, drawing 25A. Having Ra=0.50 and RF = 10092, find: a) The total rotational losses of the motor at rated conditions [4 marks] b) The no-load speed of the motor at 2001. [6 marks] Answer:
5.2. (15 pt.) A shunt DC motor has the following characteristics Prated 30 hp, Vt = 240 V; nated 1200 rpm Ra-0.19 Ω; Rs 0.02 2; Rotational losses at full load 3550 W rated= 110 A NF 2700 tums per pole NSE 12 turns per pole Radj 100 to 400 Ω 320 Speed = 1200 r/min 240 き 200 180 3 160 140 120 100 0 0. 0.2 0.3 04 0.5 0.6 0.7 0.8 0.9 1.0 1. 2 13 1.4...
A shunt connected DC motor has independent control over armature and field c The motor ratings are P watts, n RPM, Ia armature amperes, V volts on the armature, and Ir field amperes. Assuming a linear magnetic structure and ignoring all losses (resistance, windage and friction) complete the following table. Show your calculations Field Current VoltageArmatureSpeed Current Torque Power Ratings Case l Case 2 Case 3 ½la 2 1r
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