Dual-shaft vacuum pump
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United States of America Patent
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-
Jul 14, 2009
Grant Date -
Oct 20, 2005
app pub date -
May 23, 2003
filing date -
May 29, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-shaft vacuum pump has a simplified drive motor. The two-shaft vacuum pump has a synchronous motor as a drive motor which motor rotor is permanently excited. Permanently excited motor rotors are sufficiently small and of light weight such that rotor supporting bearings can be omitted. This also eliminates the problems associated with cooling and lubrication of the supporting bearings.
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