Vacuum pump having an rpm-measuring device

Details Vacuum pump having an rpm-measuring device Vacuum pump having an rpm-measuring device

1988-02-29

1989-04-18

Freeh, William L.

Pumps

With signal, indicator, or inspection means

417 22, 415 90, 415118, F04B 3900, F01D 2500

Patent

active

048222518

ABSTRACT:
A vacuum pump has a housing, a pump shaft having a terminal shaft portion, a bearing member mounted in the housing and supporting the pump shaft and a rotor affixed to the pump shaft. The housing has a housing wall forming a side chamber with the bearing member. The terminal shaft portion projects through the bearing member into the side chamber. There is further provided a device for measuring the rpm of the rotor. The device comprises an inductive sensor held in the housing wall and a ferromagnetic member mounted on the terminal shaft portion for rotation in unison therewith. The ferromagnetic member induces electric pulses in the inductive sensor at a rate proprotionate to the rpm of the rotor. A non-magnetic partition separates the inductive sensor from the side chamber.

REFERENCES:
patent: 1927799 (1933-09-01), Mann
patent: 4180375 (1979-12-01), Magnussen Jr.
patent: 4328824 (1982-05-01), Kiernan et al.
patent: 4384825 (1983-05-01), Thomas et al.
patent: 4465442 (1984-08-01), Lang et al.
patent: 4500268 (1985-02-01), Sundberg et al.
patent: 4502853 (1985-03-01), Oli
patent: 4596514 (1986-06-01), Matsumoto et al.

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