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A 208 V shunt motor is rated at 5 HP and 1000 rpm. At rated output...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calc...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calculate the following: (a) the armature current; b) the output torque (c) the mechanical developed power (d) the mechanical developed torque; and, e) the external resistance required in series with the armature to limit the starting torque to 200 % of rated torque. If the load...
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 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 de shunt motor drives a centrifugal pump at a speed of 1000 rpm when the...
A de shunt motor drives a centrifugal pump at a speed of 1000 rpm when the terminal voltage and line currents are 200 V and 50 A, respectively. The arma- ture and field resistances are 0.1 and 100 2, respectively. a. Design a starting resistance for a maximum starting current of 120 A in the armature circuit. b. What resistance should be added to the armature circuit to reduce the speed to 800 rpm? C. If the terminal voltage is...
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...
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...
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 certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
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...
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...
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...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm a...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calculate the following: (a) the armature current; b) the output torque (c) the mechanical developed power (d) the mechanical developed torque; and, e) the external resistance required in series with the armature to limit the starting torque to 200 % of rated torque. If the load...
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 de shunt motor drives a centrifugal pump at a speed of 1000 rpm when the terminal voltage and line currents are 200 V and 50 A, respectively. The arma- ture and field resistances are 0.1 and 100 2, respectively. a. Design a starting resistance for a maximum starting current of 120 A in the armature circuit. b. What resistance should be added to the armature circuit to reduce the speed to 800 rpm? C. If the terminal voltage is...
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...
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 certain load is 46 A. (a) What is the motor speed at this load? (b) At this load, if the field circuit resistance is increased to 100 Ohms, what is the new speed of the motor? Assume linearity between the flux...
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...
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...
14. The following details are known about a 200 hp, 500 V, 435 rpm de shunt motor: full-load current is 330 A, insulation class is H, weight is 3400 kg, external diameter of the frame is 915 mm and length of the frame is 1260 mm. If the motor is running at full-load, calculate: a. the total losses and efficiency. b, the approximate shunt field exciting current if the shunt field causes 15% of the total losses. the value of...
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