| 摘要 |
Radial magnets (6) are arranged in contact with each other in a cross shape, in the middle of which is a space for receiving a central magnet (5) and a core (4). The central magnet and core are of the permanent or soft magnetic type. The central magnet is coaxial to the annular magnet and can generate a second external magnetic field with an opposing polarity to the first external magnetic field generated by the annular magnet. The radial magnets are in contact with the central and annular magnets, generating magnetic fields which are essentially at right angles to the first and second fields and forming a magnetic circuit that forms an axial external field inside the bore through the annular magnet. |
