A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be...
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 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....
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 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...
3. Each pole of a 100 kW, 250 V short-shunt flat-compound generator has a shunt field of 2000 turns and a series field of 7 turns. If the series-field resistance is 0.01 and total shuntfield resistance is 100 2. Calculate the mmf when the machine operates at (a) no-load and (b) full-load Circuit Calculation(s) ha armature is connecte A permanent magnet dc motor tumsa source. Calculate the armature voltage requin (b) 1600 rpm. Neglect armature resistance. Circuit agnet de motor...
A long-shunt, cumulatively compounded dc generator has 1800 shunt-field turns per pole and 12 series-field turns per pole. The armature resistance is 0.12 ohm, the series-field resistance is 0.04 ohm, and the shunt-field resistance is 210 ohms Data for the open-circuit characteristic at 1700 r/min is as follows: Volts 110 200 280 300 Amperes 0.5 1.9 2.35 The generator supplies a load of 15 kW at 200 V when it is driven at 1700 r/min. Determine the speed at which...
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of 125Ω, when it is running as a motor, the current taken from the supply is 5A. Calculate the efficiency of the machine i) On no- load ii) As a motor when taking a current of 52A from the supply iii) As a generator when delivering a current of 35A. b) Distinguish between induction motor and synchronous motor.
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...
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...
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...