Dynamically induced emf and statically induced emf, Mechanical Engineering

Q. What is meant by dynamically induced emf and statically induced emf? On what factors do these depend? Derive eq. for these two emfs.

 

Sol. Dynamically induced emf:

Consider a conductor of length l m placed in a uniform magnetic field of density B wb/m2.

 

Let this conductor be moved with velocity Vm/sec in the direction of field. In this case no flux is cut by conductor, therefore. No emf is induced.

Now if this conductor is moved with the velocity v m/s in a direction perpendicular to its own length and perpendicular to the direction of the magnetic field. Flux is cut by conductor therefore, an emf is induced in the conductor.

Area swept per sec. by the conductor = l × v m2/sec

 

Flux cut per sec. = flux density × area swept per sec. = Blv

 

Rate of change of flux, d φ/dt

 

Flux cut per sec. = Blv wb/sec

 

Induced emf, e = d φ/dt = Blv volts

 

The magnitude of emf induced is proportional to the components of the velocity in a direction perpendicular  to the direction of the magnetic field and induced emf is given by

 

        E = Blv sinθ volts

 

 Statically induced emf

 Self induced emf :

 Consider a solenoid of N turns, length l m, area of x- section a square meters and of relatively permeability µr. When the solenoid carries a current of I amperes, a magnetic field of flux µi/l/ µo µra weber is set up around the solenoid and links with it.

 

If the current flowing through the solenoid is changed., the flux produced by it will change and therefore, an emf will be induced.

 

               Self induced emf e = -µ dΦ/dt

 

                           = - µ d/dt [µ/l/ µo µra di/dt = - µ2 µr µoa.di/dt

Posted Date: 7/23/2012 1:15:56 AM | Location : United States







Related Discussions:- Dynamically induced emf and statically induced emf, Assignment Help, Ask Question on Dynamically induced emf and statically induced emf, Get Answer, Expert's Help, Dynamically induced emf and statically induced emf Discussions

Write discussion on Dynamically induced emf and statically induced emf
Your posts are moderated
Related Questions
Find out the forces in cantilevers frame: Find out the forces in the members of the cantilevers frame by the method of sections. Solution Let the equilibrium of the fr

What are the rules which must be kept in mind when designing castings? Some of the points which should be kept in mind during the process of cast designing are as follows: >

Assumptions made in deriving torsional formulas: What are assumptions made in deriving torsional formulas?                                           Sol.: The torsion

What is Two Way Punching Shear? Two Way Punching Shear In columns, generally the tendency of the column is to punch through the footing.  This also is to be considered in de

Q. Materials used in insulation? All materials must be non-corrosive, compatible with other materials and used in accordance with the Manufacturer's recommendations. All mat

expression for elongation of bar of conical section under the action of axial force p whenit tapers from d1 to d2 over a length

Illustrate the following terms:- a) Mechanism and Inversion b) Slip and Creep of belt drive c) Centrifugal Tension of belt drive d) Initial Tension of belt drive

State the types of foundations We saw the different types of foundations commonly adopted for specific situation. In actual practice the situations are not very simple both in

show that energy is property of system