Time:12/13/2018 1:44:29 PMauthor:source:
For a toroidal magnet, the surface coordinate system has limitations. Because of the toroidal magnet, even after defining the cylindrical coordinate system in the material, it is necessary to define the relative coordinate system, and the center of the relative coordinate system is at the center of the ring, otherwise it is not correct. The polygon coordinate system cannot be used.
The disadvantage of not being able to use the face coordinate system is the disadvantage of using a relative coordinate system - if it is a transient analysis with a rotating object, the permanent magnet cannot be inside the rotating part.
When talking about the definition of a toroidal magnet, let's first say that there are two ways to define the magnetization direction of a permanent magnet. One is to define the relative coordinate system: Relative CS. One is to define the surface coordinate system: Face CS. The former is widely applicable. The disadvantage is that if the permanent magnet rotates, this coordinate system will not rotate with the permanent magnet, resulting in a wrong result. The latter can overcome the shortcomings of the former, so it is particularly useful for the transient magnetic field analysis of the permanent magnet in the rotating part.
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