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

Three phase ac circuit, Three Phase AC Circuit: Alternating circuits t...

Three Phase AC Circuit: Alternating circuits thus far discussed have single phase supply system and it's satisfactory for domestic application as light, fan and heating, etc.

Analogue and digital, 1. Pattern recognition A synchronous sequential machi...

1. Pattern recognition A synchronous sequential machine is to generate 1 on output z after the next clock pulse whenever the bit sequence on input x has exactly two 0’s in the last

Supernode, how does creating a supernode helps solve the problems?

how does creating a supernode helps solve the problems?

What is an oscillator and show the advantages of oscillators, Q. What is an...

Q. What is an oscillator? Discuss the advantages of Oscillators ? An oscillator is a system consisting of active and passive circuit elements to produce a sinusoidal or other r

Find the current in resistance, Q. Obtain the Thévenin and Norton equivalen...

Q. Obtain the Thévenin and Norton equivalent circuits for the portion of the circuit to the left of terminals a-b in Figure, and find the current in the 200- resistance.

Auxiliary carry fla - registers, Auxiliary Carry Fla - Registers If ca...

Auxiliary Carry Fla - Registers If carry  is generated  from D 3   to D 4 in the accumulator after any arithmetical or logical  operations. Auxiliary  carry flag (AC) is set

What is the basic principle of oscillators, Q. What is the basic principle ...

Q. What is the basic principle of oscillators?  In an oscillating circuit, the amplitude of voltage or current oscillations decays with time owing to the dissipation of energy

Explain about the term embedded system, Explain about the term embedded sys...

Explain about the term embedded system. An embedded system is a system which has software embedded within computer-hardware that makes a system dedicated for an application(s)

Design a 4-bit universal shift register, Q. Obtain a block diagram of a shi...

Q. Obtain a block diagram of a shift-left/right register using D flip-flops. Q. Design a 4-bit universal shift register. Q. (a) Show a block diagram of an SRFF connected to s

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