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

Determine the output voltage increment, (a) Design a 6-bit R-2 R ladder D/A...

(a) Design a 6-bit R-2 R ladder D/A converter. (b) For V ref = 10 V, find the maximum output voltage. (c) Determine the output voltage increment. (d) If the output voltag

Physics, find the resultant of two forces 20N and25N acting at an angle 60...

find the resultant of two forces 20N and25N acting at an angle 60 degree each other

Derating factor, Conductors with a temperature rating of 75 degrees C are r...

Conductors with a temperature rating of 75 degrees C are run in an area with an ambient temperature of 55 degrees C. What would be the de-rating factor that should be applied?

Distinguish between ferromagnetic and diamagnetic materials, Distinguish be...

Distinguish between ferromagnetic and diamagnetic materials, mentioning at least one example of each. Ferromagnetic Materials: These are materials wherein magnetic dipoles in

transmisson medium, Can I find out the salution of electrods Transmissio...

Can I find out the salution of electrods Transmission medium light sound uncoupling magnet for high dc cycle.

Explain the cmp instruction, Explain the CMP instruction . CMP: The comp...

Explain the CMP instruction . CMP: The comparison instruction is a subtraction which changes only the flag bits; the destination operand certainly not changes. A comparison is h

Current trasnsformer, A 13.8 kV feed er circui t breaker has a 600:5 multir...

A 13.8 kV feed er circui t breaker has a 600:5 multira tio curr ent transform er with charact eristics as show n in Figure 5.11. Th e max - imum load on the feed er is 80 A pri mar

Frequency synthesized signal generator, Q. what is frequency synthesized si...

Q. what is frequency synthesized signal generator? Describe its circuit in detail. OR Give the circuit details of frequency synthesizer also explain its working. OR

What are the duties of sub-station operator, What are the Basic Duties of S...

What are the Basic Duties of Sub-Station Operator? Ans: Sub station operator is responsible for safe and proper operation of all electrical equipments in sub-station. He co

Power electronics, principle of 120 degree mode of operation of voltage sou...

principle of 120 degree mode of operation of voltage source intverter

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