電磁鋼板における回転磁界鉄損とその推定法 (<特集>パワーマグネティックス)

概要

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The rotational iron loss, W_R(B_L, B_C), of electrical steel sheets at two-dimensional flux densities B_L and B_C were compared with the sum of the alternating iron losses W_L(B_L) and W_C(B_C) at B_L and B_C, respectively. In the case of B_L + B_C < 2T, K ≒ 1 , where K is the ratio of W_R(B_L, B_C) to W_L(B_L) + W_C(B_C). For B_L + B_C > 2T, K < 1, the value of K is almost independent of the grade of a non-oriented steel sheet. K is higher in a grain-oriented steel sheet than in a non-oriented steel sheet, and is highest in a doubly grain-oriented steel sheet. The rotational iron losses can be approximately estimated from the alternating iron losses and the constant K. In a non-oriented steel sheet, which is polycrystalline, if B_L+B_C is low, it is assumed that each crystal grain is mainly magnetized along the easy axis, even if the exciting field is rotational, and that the rotational iron loss is almost equal to the sum of the alternating iron losses in two directions.
1997-04-15