| 摘要 |
<p>A magnet ring assembly (138) for a piston/magnet assembly that can be used in a Stirling cycle cryocooler comprises a cylindrical magnet holder (188) and a plurality of magnet sectors (190) disposed on the inner surface of the magnet holder. The magnet sectors are captured in the rotational direction by bonding the magnet sectors to the inner surface of the magnet holder. The magnet sectors are also captured in the radial direction by providing them with a uniform radial magnetic field, such that they mutually repel each other against the inner surface of the magnet holder. Also, the edges of the magnet sectors are shaped, such any one magnet sector is prevented from being displaced radially inward by the edges of adjacent magnet sector. The magnet sectors are captured in the axial direction by forming an annular ledge (200) on the inner surface of the magnet holder on which one axial edge of each magnet sector rests, and swaging the axial edge(196, 198) of the magnet holder around the other axial edge of each magnet sector.</p> |
