Pole-face losses in alternators. An investigation of eddy-current losses in laminated pole shoes

Eddy Currents in Laminated Rectangular Cores

“…(13.1), (14) and (16), that due to high conductivity of iron σ, eddy current loss in a lamination is only mildly sensitive to the value of the thickness of insulation layers, T 1 .…”

“…Eddy currents are also produced due to periodically time-varying excitations [8][9][10][11][12][13][14][15][16][17]. Alternating magnetic flux in transformer cores induces eddy currents resulting in eddy current loss.…”

“…Theoretical and experimental investigations of tooth-ripple phenomena in laminated pole-shoes are reported [12][13][14][15][16][17] in literature. In their treatment for eddy currents in laminated pole-shoes, authors [15,16] have considered infinite half-space filled with identical laminations of arbitrary thickness.…”

“…In their treatment for eddy currents in laminated pole-shoes, authors [15,16] have considered infinite half-space filled with identical laminations of arbitrary thickness. It is assumed that insulation regions of negligible thickness, restrains eddy currents in one lamination from flowing into another.…”

Eddy Current Phenomena in Laminated Structures Due to Travelling Electromagnetic Fields

“…Eddy current phenomena in laminated cores subjected to sinusoidally time varying electromagnetic fields have been studied by many authors [4][5][6][7]. Theoretical and experimental investigations of eddy currents in laminated pole-shoes are reported in literature [8][9][10][11][12]. Bondi and Mukherji [10] have analyzed electromagnetic fields in the laminated poleshoe using a model with negligible thickness of insulation on iron surfaces of each pole-shoe lamination and infinite air gap length.…”