Field-pole leakage flux in salient-pole dynamo-electric machines

In this paper the authors investigate the problem in salient-pole dynamo-electric machines of flux passing from field pole-tip to pole-tip without linking the armature winding. This flux, designated ¿pole-tip leakage,¿ is of broad interest in determining both transient and steady-state performance characteristics of salient-pole dynamo-electric machines. The problem is treated as one of two´ dimensions and the method of conformal transformation is used to obtain results in the form of elliptic functions. Numerical results are obtained by a method of cross-plotting and given in curve form for the usual range of variables. The curves have been used in the design of machines for 5 years, and the great number of test-results obtained have been found to be in very satisfactory agreement with the calculations.