a) A six-pole, lap-wound, 220 V, shunt-excited d.c. machine takes an armature currentof 2.5 A when unloaded at 950 r/min. When loaded, it takes an armature current of54 A from the supply and runs at 950 r/min. The resistance of the armature circuit is0.18 S2 and there are 1044 armature conductors. For the loaded condition, calculate:the induced e.m.f.CS Scanned with CamScanneri.ii.the useful flux per pole.iii.the torque developed by the machine in Nm.

Answered: a) A six-pole, lap-wound, 220 V,…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 10RQ: What is armature reaction?

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The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating at full-load, the temperature of the winding is 75 °C. The temperature coefficient of resistance of copper is 0.00427 per °C at 0°C. Find the resistance of the field winding at full-load.
a) A six-pole, lap-wound, 220 V, shunt-excited d.c. machine takes an armature current of 2.5 A when unloaded at 950 r/min. When loaded, it takes an armature current of 54 A from the supply and runs at 950 r/min. The resistance of the armature circuit is 0.18 and there are 1044 armature conductors. For the loaded condition, calculate: b) Use the information provided in Part (a) above to determine: i. The constant loss, C The output power when the machine is loaded. ii. iii. The output torque when the machine is loaded. Hint: Draw the power flow diagram.
Write the solution neatly so i can understand it.
I:01)
dc machines
The armature of a d.c. The machine has a resistance of 0.25 ohm and is connected to a 300V supply. Determine the e.m.f. generated when it runs as a generator giving 100 A and as a motor taking 80 A.
I need the complete solution.
• A DC shunt machine while running as generator develops a voltage of 250 V at 1000 r.p.m. on no-load. It has armature resistance of 0.5 ohm and field resistance of 250 ohm. When the machine runs as motor, input to it at no-load is 4 A at 250 V. Calculate the speed and efficiency of the machine when it runs as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4 %
The following information is given for a 300kW, 600V, long shunt compound DC generat or, shunt field resistance is 75 ohms, armature resistance 0.01, brush resistance is 0.011 ohrms, series field resistance is 0.012 ohms and the divert or resistance of 0.036 ohms.When the machine is delivering full load; a. Draw the circuit diagrarn b. Calculate the voltage and C Power generated by the armat ure.
Assume that a separately excited shunt de machine has a rated terminal voltage of 230 V and a rated armature current of 100 A. Its armature winding resistance, commutating winding resis- tance, and compensating winding resistance are 0.08, 0.01, and 0.00842, respectively. The resis- tance of external wires (i.e., R…) is 0.00242. Determine the following: (a) The induced armature voltage if the machine is operating as a generator at full load (b) The induced armature voltage if the machine is operating as a motor at full load
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A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb . Find : the magnetizing reactance the rms values of the ( magneto – motive force , exciting and armature currents , magnetic fluxflu the inductance Draw the phasor diagram of the circuit

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