Determine total magnetic flux, Electrical Engineering

Determine Total magnetic flux:

A ring is composed of three sections. The cross-sectional area is 0.001 m2 for each section. The mean lengths of each section are la = 0.3 m, lb = 0.2m, lc = 0.1 m. An air-gap length of 0.1 mm is cut in the ring. Relative permeabilities for sections a, b, c are 5000, 1000 and 10000 respectively. Flux in the air gap is 7.5 × 10- 4 Wb and the coil has 100 turns. Determine (a) Total m.m.f, and (b) exciting current.

Solution

Reluctance of section a of ring

Sa  =( la/ μ0 μra A )=  0.3 / (4π× 10- 7 × 5000 × 0.001)

= 47746.37 AT/Wb

Reluctance of section b of ring

Sb  = lb/ μ0 μrb A =0.2 / (4π× 10- 7 × 1000 × 0.001)

    = 159154.57 AT/Wb

Reluctance of section c of ring

Sc  = lc/ μ0 μrc A =0.1 / 4π× 10- 7 × 10000 × 0.001 = 7957.73 AT/Wb

Reluctance of air-gap

S g  = lg / μ0 Ag =  0.1 × 10- 3/4π× 10- 7 × 0.001

                            = 79577.73 AT/Wb

Total Reluctance

S = Sa  + Sb  + Sc  + Sg  = 294436.4 AT/Wb

(a) Total m.m.f = Flux × Reluctance = 7.5 × 10- 4 Wb × 294436.4 AT/Wb = 220.83 AT.

(b) Exciting Current = m.m.f/ No. of turns  = 220.83/100  = 2.21 Amp

Posted Date: 2/4/2013 5:47:37 AM | Location : United States







Related Discussions:- Determine total magnetic flux, Assignment Help, Ask Question on Determine total magnetic flux, Get Answer, Expert's Help, Determine total magnetic flux Discussions

Write discussion on Determine total magnetic flux
Your posts are moderated
Related Questions
electrical project produse eneargy desingn

industrial approach of speed control of dc series motor

Q. Explain the conditions under which an RC circuit behaves as Integrator? Integrator is a circuit in which the output voltage is proportional to the integral of the input. Out

Discuss DMA definition. Direct memory access (DMA) is a process wherein an external device takes over the control of system bus by the CPU. Direct memory access is for high-sp

The growth in communications over the past 60 years has been phenomenal. The invention of the transistor in 1947 and the integrated circuit and laser in 1958 have paved the way to

Explain Synchronisation and Parallel Operation Generation, transmission and distribution of electric power have to be conducted in an efficient and reliable way at a reasonable

Q What is Dual Tone Multi Frequency? Dual Tone Multi Frequency (DTMF) was first introduced in 1963 with 10 buttons in Western Electric 1500 -type telephones. DTMF was originall


Q. Explain Analog communication system? Analog signals in an analog communication system can be transmitted directly via carrier modulation over the communication channel and d

The magnetic fields can be plot by using: i.  Compass ii.  Iron dust method  .