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Understanding E.M.F Equation for DC Generators

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Learn how to calculate electromotive force for DC generators using Faraday's law of electromagnetic induction. Understand the key variables and equations involved.

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Understanding E.M.F Equation for DC Generators

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  1. LECTURE 7

  2. Previous lesson The principle of dc generator

  3. Lesson Decleared The e.m.f equation of dc generator

  4. E.M.F EquationLetΦ = flux/pole in weberZ = total number of armture conductors= No.of slots x No.of conductors/slotP = No.of generator polesA = No.of parallel paths in armatureN = armature rotation in revolutions per minute (r.p.m)E = e.m.f induced in any parallel path in armatureGenerated e.m.f Eg = e.m.f generated in any one of the parallel paths i.e E.Average e.m.f geneated /conductor = dΦ/dt volt (n=1)

  5. Now, flux cut/conductor in one revolution dΦ = ΦP WbNo.of revolutions/second = N/60Time for one revolution, dt = 60/N secondHence, according to Faraday's Laws of Electroagnetic Induction,E.M.F generated/conductor isFor a simplex wave-wound generatorNo.of parallel paths = 2For a simplex wave-wound generatorNo.of parallel paths = 2No.of conductors (in series) in one path = Z/2

  6. E.M.F. generated/path isFor a simplex lap-wound generatorNo.of parallel paths = PNo.of conductors (in series) in one path = Z/PE.M.F.generated/pathIn general generated e.m.fwhere A = 2 - for simplex wave-winding

  7. Note:The student should read and learn this equation carefully.

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