摘要
In the present work, the strength and distribution of electromagnetic field in the square cold crucible that designed for casting multicrystalline silicon were measured and analyzed by using a small coil method. The results show that in the perpendicular direction the maximum of magnetic flux density （B） appears at the position slightly above the middle of the coil, and then B attenuates toward both sides, and decreases more to the bottom of the crucible. In the horizontal direction, from the edge （comer） to the center, B firstly decreases gradually, and then slightly increases in the center. While along the inner sides of the crucible, the distribution is relatively uniform, especially in the effective acting range. B increases with the increasing of the input power. Moving the coil to the top of the crucible, B increases and the effective acting range of the electromagnetic field becomes bigger. For the coils with different turns, the five turns coil can induce the highest magnetic flux density.
In the present work,the strength and distribution of electromagnetic field in the square cold crucible that designed for casting multicrystalline silicon were measured and analyzed by using a small coil method.The results show that in the perpendicular direction the maximum of magnetic flux density(B) appears at the position slightly above the middle of the coil,and then B attenuates toward both sides,and decreases more to the bottom of the crucible.In the horizontal direction,from the edge(corner) to the center,B firstly decreases gradually,and then slightly increases in the center.While along the inner sides of the crucible,the distribution is relatively uniform,especially in the effective acting range.B increases with the increasing of the input power.Moving the coil to the top of the crucible,B increases and the effective acting range of the electromagnetic field becomes bigger.For the coils with different turns,the five turns coil can induce the highest magnetic flux density.
基金
supported by the National Natural Science Foundation of China (50804012)
the Natural Science Foundation of Heilongjiang Province,China (E201002)
