Explain the synchronous machines, Electrical Engineering

Assignment Help:

Explain the Synchronous Machines?

A synchronous machine, unlike an induction (or asynchronous) machine, only develops torque at a fixed, so called, synchronous speed - ns which is related to the supply frequency f and the number of pole-pairs p as follows:

ns = 60 . f / p

The main application of a synchronous machine is as a generating device for the bulk conversion of mechanical energy (from a gas, steam or water turbine or a diesel engine) to electrical energy. It is therefore found in all types of power generating stations and also standby generating plants. In the case of a steam plant, the machine is often referred to as a turbo-generator, turbine generator or turbo-alternator. Electrical machines are in general reversible in nature meaning that they are capable of operating both as a motor and as a generator. In this sense, the synchronous machine is no exception. A good example of this are pumped-storage hydro-electric schemes such as the one at Dinorwig in North Wales comprising 6 x 315-MW synchronous machines which can be operated as generators or motors. Synchronous motors are more expensive to install than induction motors and are only found in relatively small numbers in industry where there is a requirement both for a constant-speed drive and the ability of reactive power control.

If inverter-fed they can be used in high-speed variable speed drives for traction applications. Small single-phase synchronous motors have been widely used to provide a timing mechanism for processes such as washing machine cycles. A permanent magnet synchronous machine, usually termed as a DC brushless machine, serves as a basis for numerous high performance servo applications for machine tools and industrial robots. The objective of this module is to look at synchronous machines as a central part of a power generation system. In this sense, the following sections will discuss only the fundamental theory of classical synchronous generators and not the machine operating characteristics in motoring mode.


Related Discussions:- Explain the synchronous machines

Explain ferroelectricity, Explain ferroelectricity. Ferroelectricity: ...

Explain ferroelectricity. Ferroelectricity: - Materials of ferroelectric have a high dielectric constant that is non-linear that is, this depends to a considerable extent on t

Diode, #quetunnel diode stion..

#quetunnel diode stion..

Explain own-exchange routing, Q. Explain Own-exchange routing? Own-exch...

Q. Explain Own-exchange routing? Own-exchange routing or distributed routing enables alternative routes to be chosen at the intermediate nodes. So strategy is capable of respon

Analysis in equilibrium, Analysis in equilibrium : Solution of Poisson'...

Analysis in equilibrium : Solution of Poisson's Equation with suitable boundary conditions - Non-equilibrium analysis: The electron and hole densities are no longe

Charge and electric force, Charge and Electric Force The proton has a c...

Charge and Electric Force The proton has a charge of +1.602 10 -19 coulombs (C), while the electron has a charge of -1.602 × 10 -19 C. The neutron has zero charge. Electric c

Characteristics of transformer, Q. Characteristics of Transformer? The ...

Q. Characteristics of Transformer? The characteristics of most interest to power engineers are voltage regulation and ef?ciency. The voltage regulation of a transformer is a me

Energy conservation, Energy Conservation Our country has a vast poten...

Energy Conservation Our country has a vast potential of energy saving. It is estimated in which measures for energy conservation and improving energy efficiency have the pote

Evaluate the current using the loop-current method, Consider the circuit in...

Consider the circuit in Figure (a), which include a controlled source, and find the current in the 5-V source and the voltage across the 5- resistor by using (a) the loop-current

What is voltage multiplying dacs, What is Voltage Multiplying DACs? Mul...

What is Voltage Multiplying DACs? Multiplying DACs function on the principle of producing a weighted sum analog signal where the sum is proportional to the digital input signal

Determine the reactive kva of the motor, Athree-phase, wye-connected, round...

Athree-phase, wye-connected, round-rotor, 220- V, 60-Hz, synchronous motor, having a synchronous reactance of 1.27  per phase and negligible armature resistance, is connected in p

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