Spherical Boundary Reaction in a Magnetic Field
The magnet plays a crucial role in the permanent magnetic cylinder magnetic separator, directly influencing the quality of the separated ore. As a result, the distribution of the magnetic field has become a central focus of research. Recently, a new type of curved magnetic field technology has been introduced and studied extensively. Researchers like Rong have explored this technique in depth, leading to new insights into magnetic field behavior.
The magnetic field surrounding a magnet is generated by the spin of electrons within it. According to high school physics, we know the direction of the magnetic poles, and the rotation direction of the electrons can be determined accordingly. A magnetic field is not just an abstract concept—it’s a physical entity. Many people mistakenly compare it to wind or water, thinking that aligning two magnetic poles would create directional torque. This is a misunderstanding.
In reality, a magnetic field is not something that pushes into a fluid or acts like a strong wind driving turbine blades. It has unique characteristics, one of which is the spherical boundary effect. This phenomenon describes how the magnetic field extends outward from the magnet in a spherical (or mushroom-like) shape, with the radius increasing gradually. Imagine it as a wave—when two waves come close, they exert a repulsive force. Think of two balloons approaching each other; as they get closer, the repulsion increases. However, when waves move apart, a pulling force occurs. This is different from a rubber band, where tension decreases as it stretches. With magnets, the attraction between opposite poles becomes stronger as they get closer, similar to gravity, where the closer you are, the stronger the pull.
The spherical nature of the magnetic field means that any magnetic force can be broken down into two opposing forces: a positive force and a reverse force at any given point. Based on this spherical boundary effect, any motor model constructed using simple isotropic magnets will not function properly. When two isotropic magnets are placed near each other, they interfere with the natural flow of the magnetic field, creating a repulsive force.
Let’s define the forward output as Wf and the backward output as Wb, assuming Wf > Wb. Consider the rotor's path as the main subject of study. Let O be the equilibrium point, where the magnetic field is strongest. From point A to O, the force is a backward output, while from O to B, it’s a forward output. When the rotor starts at point O, it begins doing negative work as it moves toward point A. The maximum force F occurs when the rotor approaches point O. If the rotor could cross the equilibrium point, then:
Fo+ > Fo-
However, due to the spherical effect, a reverse force also exists at point A–O, preventing the rotor from crossing the equilibrium point.
Similarly, in a magnetic motor with opposite poles attracting, the rotor will eventually settle at the equilibrium point, reaching its final position.
This article was originally published on: Magnetic Separator: http://
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