Centrifugal apparatus with protection

Details Centrifugal apparatus with protection Centrifugal apparatus with protection

1997-10-09

1999-06-29

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Overspeed responsive

361 23, 318465, 388924, H02H 300

Patent

active

059176881

ABSTRACT:
A centrifugal apparatus is disclosed which includes a rotor, a motor, a speed signal generator, including a disc having alternate reflective and non-reflective stripes, for generating a rotating speed signal of the rotor, a microprocessor (mpu), an analog processing circuit. The rotating speed of the rotor is judged by both the microprocessor and the analog processing circuit including a F/V converter and a voltage comparator independently, so that an overspeed condition is prevented. The mpu may further detect a motor rotating speed and compare the variation in the rotating speed signal of the rotor and the rotating speed of the motor. If the difference exceeds a reference, the mpu stops the rotor. Another disc of which reflective strip is replaced by a non reflective strip may be provided to the rotor and a pulse compensation circuit for compensating the lack of the pulse in the rotating speed signal is also provided. This type of the disc is provided to distinguish the types of these rotors. The pulse compensation circuit detects the lack of the pulse and then, generates and adds a pulse to the rotating speed signal.

REFERENCES:
patent: 3636545 (1972-01-01), Boyd et al.
patent: 4700117 (1987-10-01), Giebeler et al.
patent: 4827197 (1989-05-01), Giebeler
patent: 4839589 (1989-06-01), Heinle
patent: 4841202 (1989-06-01), Dishner et al.
patent: 4914361 (1990-04-01), Tajima et al.
patent: 5383838 (1995-01-01), Cheng et al.
patent: 5726881 (1998-03-01), Inaniwa et al.

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