Patent ID: 8148988

Claim:
A magnet arrangement, comprising: a) a first and a second head ring magnet each having a substantially annular geometry with respect to a centre axis and b) a central ring magnet having a substantially annular geometry with respect to a centre axis; said central ring magnet being disposed between the first and second head ring magnet in direction of the centre axis; at least one of the following magnets: A) the first head ring magnet; B) the second head ring magnet; and C) the central ring magnet including a first number of first magnets and a second number of second magnets, each of said second magnets being disposed in between two of said first magnets in a circumferential direction, forming together the substantially annular geometry, wherein an orientation of the magnetic polarization of the magnets is different for adjacent magnets, wherein at least two first magnets represent a guidance for one second magnet disposed in between these two first magnets allowing a radial movement of said second magnet, said second magnet being in physical contact with the adjacent two first magnets during radial movement of the second magnet.