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
(a) Consider the circuit of the noninverting amplifier in Figure, including an ideal op amp. Obtain an expression for the voltage gain of the overall circuit. (b) Let R i = 10

Q. An integrator as shown in Figure is to be designed to solve dy(t) / dt + 2000y (t) = 0 with y(0) = 5. If R i is chosen to be 10 k, find C f .

Design a combination circuit to combine two signals as follows: v 0 = -2 v 1 - 8v 2 - v 3 The following specifications are imposed: R in ≥ 20 k? at all inputs All

Explain protected mode addressing. This addressing permits access to data and programs located as the first 1M byte of memory, with in the first 1M byte of memory. Addressing

Q. Expain different control function categories,And also discuss that how they help in signalling and control. Ans: In some switching systems, Control subsystem may be a

What is an interrupt? An interrupt is either a software-generated CALL or hardware-generated CALL.

Q. Analog communication systems? An analog message is a continuum of possible amplitudes at any given time, and analog signals are continuous in time and in amplitude, such as

State the advantages and disadvantages of alloying steel with silicon for use as magnetic materials in transformer and electric machines. Extensive utilize, is made of iron-sil

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

Q. What is thermal runaway. The problem of self heating arises due to dissipation of power at the collector junction. The leakage current ICBO is extremely temperature dependen