Abstract
The present invention provides a magnetic field adjustable type magnetic unit, which includes at least three magnets. The magnets include at least two axially-magnetized magnets and at least one radially-magnetized magnet. The two axially-magnetized magnets and the radially-magnetized magnet are alternatively stacked. Directions of magnetic field lines generated by the two axially-magnetized magnets and the radially-magnetized magnet sandwiched in between the two axially-magnetized magnets are clockwise and counterclockwise respectively and coils are wound around the two axially-magnetized magnets for making current so as to allow the magnetic field adjustable type magnetic unit to change the strengthening direction of the magnetic field line according to current intensity. The magnetic polarization direction of the present invention is arranged in a special arrangement and the coils are wound around the magnet with particular polarization direction to control the intensity and direction of the magnetic field according to the current intensity generated by the coils.