Show elementary synchronous machines, Electrical Engineering

Assignment Help:

Q. Show Elementary Synchronous Machines?

The polyphase synchronous machine operates with direct current supplied to the field winding (assumed to be on the rotor, which is usually the case) through two slip rings and with polyphase alternating current supplied to the armature (assumed to be on the stator). The rotormmf, which is obtained froma dc source, is stationarywith respect to the rotor structure.When carrying balanced polyphase currents, the armature winding produces a magnetic field in the air gap rotating at synchronous speed, as determined by the system frequency and the number of poles in the machine. But the field produced by the dc rotor winding revolves with the rotor. To produce a steady unidirectional torque, the rotating fields of stator and rotor must be traveling at the same speed. Therefore, the rotor must turn precisely at the synchronous speed.

The polyphase synchronous machine is one in which the rotor rotates in synchronism with and in the same direction as the rotating mmf wave produced by the stator. Thus for synchronous machineswith polyphase statorwinding, the following equation relatingmechanical and electrical angular speeds is satisfied:

2139_Show Elementary Synchronous Machines.png

or alternatively, the steady-state speed at which the machine operates is known as the synchronous speed, given by

848_Show Elementary Synchronous Machines2.png

where f is the frequency of the system of which the machine is a part and P is the number of poles of the machine.

944_Show Elementary Synchronous Machines1.png


Related Discussions:- Show elementary synchronous machines

Single phase full wave controlled rectifier , Single Phase Full Wave Contro...

Single Phase Full Wave Controlled rectifier The single  phase  half  wave controlled  rectifier  produce only one pulse  of load  current  during  one cycle  of supply voltage

Field effect transistor, Field effect transistor: Primarily difference...

Field effect transistor: Primarily difference between bit and jet is that bit transistor is a current controlled device while jet is a voltage controlled device.  Is a direct

Explain the construction of jfet, Q. Explain the construction of JFET? ...

Q. Explain the construction of JFET? The basic construction of the p-channel JFET is shown in figure. The major part of the structure is the p-type material that forms the chan

Find the flux density in the air gap of the right leg, Q. In the magnetic c...

Q. In the magnetic circuit shown in Figure the center leg has the same cross-sectional area as each of the outer legs. The coil has 400 turns. The permeability of iron may be a

Draw the differentiator circuit, Q. Draw the differentiator circuit. Explai...

Q. Draw the differentiator circuit. Explain its principle of operation with necessary waveforms ? A circuit in which the output voltage is directly proportional to the derivati

How many simultaneous calls can be made during peak time, Q. In a hundred-...

Q. In a hundred-line exchange 24 two-motion selectors are used. Draw schematic you suggest for this exchange and illustrate its working. How many simultaneous calls can be made du

Difference between cmp and sub instructions, Mention how do the following i...

Mention how do the following instructions differ in their functionality SUB: It performs changes the destination operand and the subtraction operation. CMP: Comparison instr

Measurment, emitter followers regulator

emitter followers regulator

Solar steam power generator, This project is about another particular appli...

This project is about another particular application of a particular embodiment of the patent: A Long Stroke Steam Engine using Solar Generated Steam. The machine elements such as

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