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Ring magnet made of hard magnetic material

Since ring magnets are specified, there are only two “circular and ring end faces of the ring (one N—S)”. Other situations may be realized, but they cannot be called ring magnets. A ring magnet made of a hard magnetic material is not magnetic before being magnetized. Its magnetic pole position, magnetic pole pair, depends on the magnetization method. In fact, we can see all kinds of ring magnets.
Magnetic pole position:
Some have one or more pairs of magnetic poles on the outer ring of the ring;
Some have one or more pairs of magnetic poles in the inner ring of the ring;
There are two ring-shaped end surfaces on the ring (one N-S)
There are also poles on one ring end face with one or more pairs of poles

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