Series-parallel magnetic circuit, Electrical Engineering

Series-Parallel Magnetic Circuit:

Figure shows an electromagnet made of cast steel contain a coil of 500 turns wound on the central limb. The cross-sectional area of the outer limbs and central limb are 2.5 cm2 and 6 cm2 respectively. Find out the current that the coil should carry to generate a flux of 0.6 m Wb in the air-gap. The magnetization curve for cast steel is as specified below :

1768_Series-Parallel Magnetic Circuit1.png



There are two equal parallel paths ACDE and AGE.

Flux density in either parallel path is half of that in the central path as flux divides into two equal parts at point A.

Total m.m.f needed for the whole electromagnet = m.m.f required for path

EF + m.m.f required for the air-gap + m.m.f required for either of the two parallel paths, say path ACDE.

Flux density in the central limb and air-gap = 0.6 × 10/6 × 10- 4 = 1 Wb/m2 .

Corresponding value of H found from the given data = 900 AT/m.

So, AT for central limb = 900 × 25 ×10- 2 = 225 AT

H in the air-gap =  B /μ0

=0.6 × 10- 3 / 4π× 10- 7

= 477.46 AT/m

So, AT required for air-gap = 477.46 × 0.8 ×10- 2 = 3.82 AT.

Flux density in the path ACDE is 0.5 Wb/m2 and corresponding H is 540 AT/m.

So, AT required for path ACDE = 540 × 100 × 10- 2 = 540 AT

Total AT required = 225 + 3.82 + 540 = 768.82

Current required = 768.82 /500 = 1.54 Amp .

Posted Date: 2/4/2013 5:59:17 AM | Location : United States

Related Discussions:- Series-parallel magnetic circuit, Assignment Help, Ask Question on Series-parallel magnetic circuit, Get Answer, Expert's Help, Series-parallel magnetic circuit Discussions

Write discussion on Series-parallel magnetic circuit
Your posts are moderated
Related Questions
Assume that an abrupt Si p-n junction with area 10-4 cm2 has NA=10 17 /cm 3 and ND=10 17 /cm 3 is working at room temperature. It is given that μ n = 700 cm 2 /v-s, μ P =250 cm

Q. A four-pole dc generator is lap wound with 326 armature conductors. It runs at 650 r/min on full load, with an induced voltage of 252 V. If the bore of themachine is 42 cmin dia

Q. What do you mean by Companding? Companding is the process of compressing and expanding. It comprises compressing the signal at the transmitter and expanding it at the receiv

A single phase line has an impedance of 8.4 + j11.2 Ω. The line feeds a load consisting of a resistor and an inductor connected in parallel as shown in Figure 1. The load is absorb


how probability help in the field of electrical telecommunication engineering?

Q.  Define coil pitch, Back pitch, front pitch, pole pitch, commutator pitch, resultant pitch, Multiplex winding and degree of Re-entrant of a winding, with respect to a D.C. mach

Q. Describe the operation of 8279. And also explain following terms: (i) N key Roll over. (ii) Key board debounce. (iii) FIFO RAM. Ans: 8279 is a programmabl

Q. Explain shockly's equation and its significance in plotting the transfer characteristics ? The linear relationship does not exists in the output of the JFET, the relationshi