Emf produced by windings, Electrical Engineering

Assignment Help:

Q. emf produced by windings?

The time variation of emf for a single conductor corresponds to the spatial variation of air-gap flux density. By suitable winding design, the harmonics can be reduced appreciably, and the waveform of the generated emf can be made to approach a pure sine shape.

1677_emf produced by windings.png

Figure shows an elementary single-phase, two-pole synchronous machine. In almost all cases, the armature winding of a synchronous machine is on the stator and the field winding is on the rotor, because it is constructionally advantageous to have the low-power field winding on the rotating member. The field winding is excited by direct current, which is supplied by a dc source connected to carbon brushes bearing on slip rings (or collector rings). The armature windings, though distributed in the slots around the inner periphery of the stator in an actual machine, are shown in Figure (a) for simplicity as consisting of a single coil of N turns, indicated in cross section by the two sides a and -a placed in diametrically opposite narrow slots. The conductors forming these coil sides are placed in
slots parallel to the machine shaft and connected in series by means of the end connections.

The coil in Figure (a) spans 180° (or a complete pole pitch, which is the peripheral distance from the centerline of a north pole to the centerline of an adjacent south pole) and is hence known as a full-pitch coil. For simplicity and convenience, Figure (a) shows only a two-pole synchronous machine with salient-pole construction; the flux paths are shown by dashed lines. Figure (b) illustrates a nonsalient-pole or cylindrical-rotor construction. The stator winding details are not shown and the flux paths are indicated by dashed lines.


Related Discussions:- Emf produced by windings

Explain the different types of multivibrators, Explain the different types ...

Explain the different types of multivibrators ? Multivibrator is basically  a two-stage amplifier with output of one supplied back to the input of the other . Multivibr

Pass band of the resulting bandpass filter, A bandpass filter design can be...

A bandpass filter design can be accomplished through the cascade connection shown in Figure, where the frequencies between the two cutoffs fall in the passband of both filters and

Biasing clamper, Ask question #Minwhat is biasing of clamper imum 100 words...

Ask question #Minwhat is biasing of clamper imum 100 words accepted#

What is the basic working of decoders, Q. What is the basic working of Deco...

Q. What is the basic working of Decoders? An n-bit binary code is capable of encoding up to 2 n distinct elements of information. A decoder is a combinational network that decode

Explain lithography, Explain Lithography. Lithography - This is one ...

Explain Lithography. Lithography - This is one of the processes which is carried out throughout manufacture of integrated circuits. Silica oxide (SiO 2 ) layer is thermally

Motor, 2. A 6 pole lap-wound armature having 720 conductors, rotates in a f...

2. A 6 pole lap-wound armature having 720 conductors, rotates in a field of 20.35 mWb. (a) If the induced current is 72 A, what is the torque developed by armature? (b) If the indu

Determine the laplace transform of the waveform, Q. Determine the Laplace t...

Q. Determine the Laplace transform of the waveform shown in Figure.

Energy gap, Energy Gap Differentiating feature between the metals, ...

Energy Gap Differentiating feature between the metals, insulators, and semiconductors. Ascertains the absorption or emission spectra, the leakage current, and the intrin

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd