Principle of energy conversion, Mechanical Engineering

Q. Describe the principle of energy conversion. Show that the reaction of coupling magnetic field on the electrical or mechanical system is essential for the electro - mechanical energy conversion.

Sol.   Principal of energy conversion:

When energy is converted from one form into another., the principal of conversion energy can be invoked. According to this principle, energy can neither be created nor destroyed; it can merely be converted from one form into another.

The energy balance eq. must include these four energy terms and for a motor, it can be written as:

 

      (Total electrical energy input) = (Mechanical energy output) + (Total energy stored) + (Total energy dissipated)

And for a generator:

 

     ( Total mechanical energy output ) = ( Electrical energy input ) + (Total energy stored) + ( Total energy dissipated )

The various forms of energy involved for an electromechanical energy conversion devices, are now described below :

 

(i)                 Total electrical energy input from the supply main is Wei.

 

(ii)               Total mechanical energy output is Wmo.

 

(iii)             Total energy stored in any device = energy stored in magnetic field, Wes + Energy stored in mechanical system , Wms.

 

(iv)              Total energy dissipated = energy dissipated in electric circuit as ohmic losses + Energy dissipated as magnetic core loss ( hysteresis and eddy current losses ) + energy dissipated in mechanical system ( friction and windage losses etc. )

Thus the energy balance can be written in more specific form as :

 

             Wei = Wmo + ( Wes + Wms ) + (  ohmic energy losses + coupling field energy losses ) + Energy losses in mechanical system.

 

                   The subscripts e, m, i, s and o stands for electrical, mechanical, input, stored and output respectively.

Posted Date: 7/23/2012 1:14:09 AM | Location : United States







Related Discussions:- Principle of energy conversion, Assignment Help, Ask Question on Principle of energy conversion, Get Answer, Expert's Help, Principle of energy conversion Discussions

Write discussion on Principle of energy conversion
Your posts are moderated
Related Questions
I need assignment help in Java Language and Virtual Machine Specifications, write short notes on Java Language and Virtual Machine Specifications.

(a) Describe heat engine. How is this engine characterized? (b) Describe Perpetual motion machines of first kind and second kind, i.e. PMM1 and PMM2. Are such machines possible


Q. Setting and installations of insulation? The setting and installations of insulation shall be to Specification No. later. The steam drum surfaces shall be insulated with

What is difference between mill and mill-drill? Ans) Today many manufactures are combining machines; a mill/drill is one of these. It is a mixture of a drill and a mill, a mill

Illustrate the various Functions of clutch and also explain the Principle of frictions Clutch ? What is the requirement of Transmission System & Explain the Arrangemnet for P

(a) What do you mean by machinibility ? Discuss the factors which come into play while evaluating the machinability of any metal. Also describe machinability index. (b) Brass co

The basic aim of synthesis in design process is to provide information which can tell you how to improve the design. In general the synthesis process gives many alternatives of

1. The linkage system below consists of two bars A & B plus 4 linkages. Each linkage has a square cross section. The allowable tensile strength of all members is 200 MPa, the allow

Concep t of Temperature: The temperature is thermal state of body which describes the degree of hotness or coldness of body. If the two bodies are brought in contact, heat wi