The flux distortion caused by cross magnetizing armature reaction is more pronounced in a
Armature reaction in a dc machine is
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The air-gap flux density waveform, has decreased flux under one pole tip and measured under the other is due to
The flux distortion caused by cross magnetizing armature reaction is more pronounced in a
The method needed to limit cross-magnetizing effect is
The brushes of a dc motor, are shifted by 5′, from the main field axis, then
A 100KW, 250 V, 400 A, a long shunt compound generator has an armature resistance of 0.025 ohms. There are 1000 shunt fields turns per pole and 3 series field turns per pole. The series field is connected in a such a fashion that positive armature current produces direct-axis MMF which adds to that of the shunt field. Compute the gross MMF at the rated terminal current when shunt field current is 4.7A and speed is 1150 rpm.
Compensating windings are embedded in pole faces and having the same polarity as that of adjoining armature winding.
Compensating winding has advantage of
A dc shunt motor is connected to the source through 3-point starter. If the field id kept open and starter handle is moved from off to on position, then