Centrifugal apparatus having series-implemented protection means

Details Centrifugal apparatus having series-implemented protection means Centrifugal apparatus having series-implemented protection means

1996-05-22

1997-07-22

Cooley, Charles E.

Imperforate bowl: centrifugal separators

With condition responsive means

For controlling drive of driven means within bowl

494 10, B04B 910, B04B 1300

Patent

active

056498934

ABSTRACT:
A centrifugal protection apparatus including: a rotor having markers connected to a motor responsive to drive signals; first and second detectors for detecting the marker upon rotation of the rotor and generating first and second detection signals respectively; a drive circuit responsive to a command for generating the drive signals from the supply power via input terminal in response to the first or second detection signal; first and second switch circuits, arranged in series between the input terminal and the motor, for controlling the supply of the drive signals to the motor; a current detector for detecting a current of one of the drive signals and generating a current detection signal; and first and second judging portions for detecting whether the first and second detection signals are within a predetermined value and for operating the first and second switch circuits to cut off the drive signals when the first and second detection signals are not within the predetermined value respectively and when a magnitude of the current detection signal is larger than the predetermined value when the second detection signal is not generated. The first and second judging portions, first and second detectors, and the current detector operate in parallel and independently. The first and second switch circuits are arranged in series to provide more dependable protection.

REFERENCES:
patent: 4450391 (1984-05-01), Hara
patent: 4551715 (1985-11-01), Durbin
patent: 4700117 (1987-10-01), Giebeler et al.
patent: 4827197 (1989-05-01), Giebeler
patent: 5221250 (1993-06-01), Cheng

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