| 摘要 |
A vacuum pump, such as a Holweck type pump, includes a pump rotor 18, a cylindrical rotor element 20, a stator 12 and a motor. The cylindrical rotor element 20 is mounted on the pump rotor 18, and the stator 12 includes a threaded cylindrical element 22 adjacent the cylindrical rotor element 20. The motor includes a rotor element 26 which is mounted on an inner surface of the cylindrical rotor element 20. The pump rotor 18 and stator 12 may be formed from composite materials, such as organic matrix materials, which may comprise a resin with reinforcing fibres and/or particulates. The pump rotor 18 and cylindrical rotor element 20 may be mounted co-axially on a shaft 10. The shaft 10 may be formed from a metallic material.
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