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

Armature winding - motor control , Armature Winding In this  winding t...

Armature Winding In this  winding the working  emf is induced by the working  flux. The current  which is  dependent on the load  called current.  The windings  that handle

Ac netwoks, hello look for someone that could do i lab report form me on ac...

hello look for someone that could do i lab report form me on ac network, the report is due tonight at 12:00 so only have 8 hours left wondering if anyone is interested in do it? ca

Define lines parameters, Define Lines Parameters In power system analys...

Define Lines Parameters In power system analysis, the parameters of interest when modelling power lines are:  inductance, capacitance, series resistance and leakage resistance.

Illustrate computer-controlled routing, Q. Illustrate Computer-controlled r...

Q. Illustrate Computer-controlled routing? Computers are employed in network with common channel signaling (CCS) features. In CCS, there is a separate computer-controlled signa

If a single phase motor fails to run, Q. If a single phase motor fails to r...

Q. If a single phase motor fails to run or start slow what action to be taken. Ans: If it is not starting check the supply and test the winding if it found normal check

Define serial in - parallel out shift registers, Define Serial In - Paralle...

Define Serial In - Parallel Out Shift Registers? For this type of register data bits are entered serially in the same manner as discussed in the last section and the difference

Construct a truth table and get the minimum sop expression, Q. For the logi...

Q. For the logic circuit of Figure, construct a truth table and obtain the minimum SOP expression.

What is the colour of the light emitted from the led, Question: a) Des...

Question: a) Describe five advantages of LED lighting over conventional incandescent lighting. b) State two impairments that reduces the radiant flux of a surface-emitting

Human resources - kpi, Human Resources - KPI It is the responsibility ...

Human Resources - KPI It is the responsibility of management to have the lean, capable, customer friendly organization that strives for catering to diversified need of all the

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