Calculation of the end-region field of a.c. machines

Reece, A.B.J.; Pramanik, A. K.

doi:10.1049/piee.1965.0224

Cited by 11 publications

(1 citation statement)

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“…1 " 10 A knowledge of the approximate field distribution has led to the investigation of the forces acting upon the conductors and their supports, 11 and of the end component of leakage reactance. 10 ' 12>13 However, little has yet been done to calculate the actual eddy-current losses induced in the heavy clamping plates at the end of the stator core by the fundamental component of the rotating field. 14 The severe end heating experienced in highly rated machines is witness to the importance of this subject.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the magnetic field of rotating machines. Part 5: Field in the end region of turbogenerators and the eddy-current loss in the end plates of stator cores

Stoll

Hammond

1966

Proc. Inst. Electr. Eng. UK

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SynopsisA method of calculating the magnetic field in the end region of a turbogenerator is described. Allowance is made for nonmagnetic stator-core clamping plates and for the magnetic shaft and casing of the machine. The effect of a magnetic rotor-retaining ring is studied, the ring being regarded as a tube of finite permeability separating the stator and rotor end windings. Calculations are compared with experimental results. The field calculated at the surface of the stator-core end plates is used to estimate the eddy-current loss in these plates, and the effect upon this loss of the retain ing-ring permeability and the stator-winding cone angle is considered. List of symbolsA = magnetic vector potential B = magnetic flux density g = halfwavelength of current distribution along axis H = magnetic field strength Io(*) = modified Bessel function of first kind and zero order Ii(x) = modified Bessel function of first kind and first order Ij'OO = derivative of function I\(x) K 0 C*) = modified Bessel function of second kind and zero order K|(x) = modified Bessel function of second kind and first order K{(x) = derivative of function K,(;t) K = surface density of current sheet p = number of pairs of poles a = ^Ig r, 6, z -circular cylindrical co-ordinates s = number of cylindrical current sheets forming stator winding a = constant associated with image current 8 = -^(iplojfjLQfj,,) = skin depth of eddy currents d = phase angle /u 0 = primary magnetic constant (or permeability of free space) \x.,. = relative permeability (suffixes 1, 3 and 5 are used to denote particular regions) p = resistivity = scalar potential o» = angular frequency R = radius of circular current filament KQ = circumferential surface current density Paper 5116 P, first received 13th April and in revised form 1st July 1966 Dr. Stoll is with C. A. Parsons

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Section: Introductionmentioning

confidence: 99%