Electromagnetic conversion device with example., Mechanical Engineering

Q. In every electromagnetic conversion device, both generator and motor action take place simultaneously. Explain.

The case the output is mechanical as in a motoring mode, the coupling field must react with the electrical system as to absorb electrical energy from electrical system. In such a case i.e. in a motoring mode this reaction is counter emf e , similar to the emf induced in the primary winding of a transformer the coupling field extracts energy proportional to ei from the electrical system, converts it into mechanical from and delivers energy proportional to T? to the mechanical system.

In case the output is electrical as in a generating mode, the coupling field must react with mechanical system so as to absorb mechanical energy from mechanical system. In such a case ei, in a generating mode, this reaction is the counter torque T developed due to interactions of current i and the coupling field. Thus coupling field extracts mechanical energy proportional to T? from the mechanical system converts into electrical form and delivers energy proportional to ei to the electrical system.

Example

A coil with an axial length of 25 cm and diameter of 20 cm has 200 turns. It is placed in a uniform radial flux of 0.002 web/m2/ (a) If the coil is rotated at 25 rev. per sec., find the voltage induced in the coil. (b) What will be the force on each conductor and torque acting on the coil, if it carries a current of 10 Amps.

 l = 25 cm

 

            d = 20 cm

 

            N = 200 turn

 

            Φ = 0.002 ?b/m2

 

            V = 25 rev. per sec.

 

             e = T

 

             e = Blv

 

            B =  Φ/a

 

             a = π/4 (d2) = π/4 × (20 × 10-2)2 = 0.0314 m2

 

            B = 0.002/0.0314 T

 

            B = 0.06269 T

 

             e = 0.06363 × (25 × 10-2) × 25

 

             e = 0.398

 

             e = 0.4 volts

 

             f = BIl

 

            F = 0.06369 × 10 × 25 × 10-2 = 0.159225 newtons

 

            T = 2 IBRl

 

 

               = 2 × 10 × 0.06369 × 20/2 × 10-2 × 25 × 10-2 = 0.031845 N-m

Posted Date: 7/23/2012 1:17:58 AM | Location : United States







Related Discussions:- Electromagnetic conversion device with example., Assignment Help, Ask Question on Electromagnetic conversion device with example., Get Answer, Expert's Help, Electromagnetic conversion device with example. Discussions

Write discussion on Electromagnetic conversion device with example.
Your posts are moderated
Related Questions
how to calculate Air velocity , pressure and power done by aircraft fans


(a) Show that for an adiabatic process Pv r = C, holds good. (b) One Kg of a contain gas is at 0.11 KPa and 15 o C. It is compressed until its volume a 0.1m 3 . if the compress

Two machining operations, A (3 minutes per part) and B (10 minutes per part), are performed sequentially to manufacture a part. Machines A and B produce 5% and 6% defective items,

Objectives After studying this section, you should be capable to understand: Cell control and modeling, Context level data flow diagram, A common cell control sy

COMPRESSOR MOSTLY USED FOR SUPERHEATING OF IC ENGINES IS CALLED ----------COMPRESSORS

Under Damping If    the restoring force is larger than friction, and the oscillation is classified as under-damped. In this case,  ω  is real and behaves exactly like the solu


STORAGE AND HANDLING OF ELECTRODES It is recommended that the electrodes should be stored in a warm and dry place. Generally, conditions of storage in the shop are not very condu

how to calculate the volume of HFO burn to produice steam?