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

Distribution - salient features of nep, Distribution: This has been re...

Distribution: This has been recognized as the most critical segment of the electricity business. Here the NEP calls for proper restructuring of distribution utilities for achi

Series-parallel magnetic circuit, Series-Parallel Magnetic Circuit: Fi...

Series-Parallel Magnetic Circuit: Figure shows an electromagnet made of cast steel contain a coil of 500 turns wound on the central limb. The cross-sectional area of the outer

Explain segment assembler directive, Explain SEGMENT assembler direct...

Explain SEGMENT assembler directive with example. SEGMENT: This directive described to the assembler the start of a segment along with name segment-name. The seg

Determine the current in the circuit and the voltage, Q. Two identical junc...

Q. Two identical junction diodes whose volt-ampere relation is given by Equation in which IS = 0.1 µA, VT = 25 mV, and η = 2, are connected as shown in Figure. Determine the curren

Calculate maximum reactive power the generator can produce, A 3-phase, wye-...

A 3-phase, wye-connected, 11.8 kV, 100 MVA turbo- generator of 0.8 power factor lagging has a synchronous reactance of 2.0 p.u. on rating. The generator is driven by a steam turbin

What are transmission bridges, Q. What are transmission bridges? How do the...

Q. What are transmission bridges? How do they assist in satisfying the connectivity?  Ans: A typical transmission bridge is demonstrated in figure. Series capacitance and shunt

Calculate turns ratio, A switch-mode power supply is to be designed with th...

A switch-mode power supply is to be designed with the following specifications: input voltage V s = 48 V ± 10%, output voltage V o = 5 V, switching frequency f s = 100 kHz, outp

Compute efficiency of transformer in power factor lagging, Q. A 10-kVA, 200...

Q. A 10-kVA, 200:400-V, single-phase transformer gave these test results: • Open-circuit test (LVwinding supplied): 200V, 3.2 A, 450 W • Short-circuit test (HV winding suppli

Three phase induction motors - motor control , Three Phase Induction Motors...

Three Phase Induction Motors A three  phase induction rotor  consists  a stators  and a motor stator has balanced three  phase  winding. These windings  are distributed in the

Measuring equipment of ac-dc voltage and waveforms, Procedures and methods ...

Procedures and methods of the experiments A).      In order to measure the true RMS values of the currents and voltages, students used the true RMS multimeter. It requires two

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