Simplified presentation of the eddy-current-loss equation for laminated pole-shoes

The paper is concerned with the simplification of the equations governing tooth-ripple eddy-current loss at a laminated pole-face in the form in which they were stated in an earlier paper by Greig and Sathirakul (see 108 C, p. 130). The equations are quite complicated and their numerical evaluation can involve considerable labour. Computed data in either graphical or tabular form are necessarily cumbersome and voluminous, unless represented in non-dimensional form. It is shown that a satisfactory non-dimensional presentation of tooth-ripple eddy-current losses can be achieved by computing, for the required range of the relevant parameters, the ratio of the loss per unit area of laminated pole-face to that which would occur if the pole were not laminated.