| 摘要 |
PURPOSE:To reduce the gap between a casting and iron cores and to reduce the size and weight of a rotating field type electromagnetic stirrer, by disposing an inductor core into a polygonal shape, and disposing independent annular windings for each of the core pieces. CONSTITUTION:An inductor 2 of a polygonal shape is provided around a casting 1. The inductor is formed into the polygonal shape of iron core pieces 3a-3d. Plural grooves 8 in flow directions of castings are provided on the inside circumferential side of the cores 3, and annular windings 8 which wind the iron core pieces and are embedded in the groove 8a on the inside circumferential side of the iron cores are provided independently to each of the pieces 3a-3d of the iron cores 3. The windings 8 are so connected that the cores 3a, 3c and 3b, 3d have reversed polarities and the same phase, then two-phase AC current is flowed therein. Since the inductor 2 is formed into the polygonal shape along the casting 1, a gap 6 can be made smaller and the magnetomotive force required for the excitation of the gap 6 is decreased. The electromagnetic stirrer is thus made smaller in size and weight. |
