Principle of energy conversion, Mechanical Engineering

Assignment Help:

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.


Related Discussions:- Principle of energy conversion

Base circle-prime circle-trace point-pressure angle, Base Circle: this is...

Base Circle: this is the smallest circle tangent to the cam profile. Trace Point: this is theoretical point on the follower whose motion explained the movement of the foll

Laser sources-lasers with solid state lasing mediums, Lasers with Solid Sta...

Lasers with Solid State Lasing Mediums For an active medium, the solid state laser uses lasing ions which are suspended in a rod shaped solid matrix. These "dopants" in the rod

Introduction to tools and equipment , INTRODUCTION: At any point of time, ...

INTRODUCTION: At any point of time, it may be required to disassemble the whole or any part of motorcycle. Whenever a part of motorcycle malfunctions or is damaged then it may be

Heat loss in acylindrical pipe, Ask question #Minimum 1. Research the topic...

Ask question #Minimum 1. Research the topic of heat loss in a cylindrical pipe. Explain which laws of physics are used to discuss heat loss in a pipe, and briefly explain how the f

What is the drilling operation, What is the Drilling operation Drilling...

What is the Drilling operation Drilling operation can only performed in vertical direction. Hence drilling hole at angle is not performed by drilling machine. It is a big drawb

Find an approximated probability, Find an approximated probability: Si...

Find an approximated probability: Sixteen numbers are selected independently and at random from the interval [ 0, 1 ]. Find an approximated probability that the mean of these

Surging, what is surging in turbo machines subject

what is surging in turbo machines subject

Calculate the natural frequency of the system, (a) A mass of 1 kg is to be ...

(a) A mass of 1 kg is to be supported on a spring having a stiffness of 9800N/m. The damping coefficient is 5.9 N-sec/m. Calculate the natural frequency of the system. Determine al

Determine the permissible shear stress, A helical compression spring is use...

A helical compression spring is used to take the shock. The initial compression of the spring is 30 mm and it is further compressed by 50 mm while absorbing the shock. The spring i

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