A new arrangement, that is, a partial ring multipole magnetic system is more effective. Numerical calculation can be performed for equation (43). If n is large enough, the magnetic field near the surface of the partially annular multipole magnetic system approaches the magnetic field of the surface of the complete toroidal multipole magnetic system. Of course, this conclusion is not applicable to the magnetic system boundary, and the magnetic field drops at the boundary. This is exactly the same as the calculation shown in Figure 6. [next] As shown in Fig. 7, the magnetic system (n=4) consisting of 10 magnetic blocks, the magnetic blocks are arranged symmetrically with the vertical central axis, and the wrap angle is 150°. The magnetization direction is determined as follows: the first magnetic block is relative to the axis of symmetry. The polar angle φ A = 7.5°, so the magnetization direction of this magnetic block is φ B = -7.5 × 4 = -30° (relative to the axis passing through the center of the magnetic block in parallel with the axis of symmetry). Similarly, the second block φ A = 22.5°, φ B = -90°; and so on, φ B are -150°, -210°, and -270°, respectively. Design example: It is required to design a cylindrical magnetic separator with a diameter of 600 mm (ie, r = 300 mm) and a magnetic induction intensity of about 0.25 tex (the magnetic induction intensity change rate is less than 10%). At this time, an inexpensive isotropic bonded NdFeB permanent magnet material can be selected, which has B r = 0.5 tex. In order to make the magnetic induction intensity high and the rate of change small, n=6 is selected, and the number of magnetic blocks is 20. According to the magnetic charge method, the radial height of the magnetic block needs to be 41.7 mm. Fig. 8 is a magnetic field distribution diagram of the example. The thin line in the figure indicates that the magnetization directions of all the magnetic blocks are exactly the same as those calculated; the thick line indicates that the magnetization direction is ±5°. It can be seen from the figure that a slight deviation of the magnetization direction has little effect on the magnetic induction intensity. Aluminum Die Casting Communication Equipment Parts are a metal forming process in which molten aluminum metal is put under pressure and injected into a die.
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In fact, the magnetization direction in the range of the polar angle φ 0 cannot be continuously adjusted. As shown in Fig. 7, a ring magnetic circuit composed of a certain number of magnetic blocks is substituted for an integral magnetic ring, and each magnetic block is in its The axis of the easy magnetization is uniformly magnetized and arranged as follows:
Let φ A be the polar angle between a certain magnetic block and any fixed axis (such as the axis of symmetry of the magnetic system) (see Figure 7), so the magnetization direction angle φ B of this magnetic block is:
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