Circular magnet magnetic induction line and the location

Principle of circle of the magnetic field of the magnets are made of hard magnetic material ring magnet, the magnetization before, there is no magnetic ( Haven't magnetic magnet magnetization not before) 。 Its magnetic pole position, magnetic pole logarithm, depends on the magnetization. So the concrete use, the number of used depends on the customer. Ring magnet pole position: 1, from the two circular in the ring end face ( A N a S) 2, some in the circle of inner ring, have a pair or more poles; 3, some in the circle of the outer ring, a pair of or more of the poles; 4, also some poles in a ring end face, a pair or more for the poles.