System based on inductive coupling for sensing spin speed and an

Details System based on inductive coupling for sensing spin speed and an System based on inductive coupling for sensing spin speed and an

1995-06-19

1996-10-08

Coe, Philip R.

Textiles: fluid treating apparatus

Machines

Single tub and automatic sequential operation mechanism

68 1227, 68 233, 68 237, 73779, D06F 3302, D06F 3724

Patent

active

055619908

ABSTRACT:
A system for sensing spin speed and an out-of-balance condition in a washing machine is provided. The washing machine includes a washer basket and an agitator that spin about a predetermined spin axis during a spin cycle. The OOB condition can be characterized by excursions, during the spin cycle, of a tub which encloses the washer basket. The tub excursions can be in a direction generally perpendicular to the spin axis of the washer basket, for example. The system includes a magnetic source, such as a permanent magnet, positioned in the agitator for producing a predetermined magnetic field. A magnetic sensor is positioned to be electromagnetically coupled to the magnetic source for supplying an output signal that varies as the agitator rotates relative to the magnetic sensor. A signal processor is coupled to the magnetic sensor for receiving the output signal supplied by the magnetic sensor. The processor is programmed for measuring spin speed during the spin cycle and for detecting any out-of-balance condition during the spin cycle based on the variations of the output signal received from the magnetic sensor.

REFERENCES:
patent: 3422957 (1969-01-01), Fosler
patent: 5269159 (1993-12-01), Oh
patent: 5375282 (1994-12-01), Dausch et al.
patent: 5375437 (1994-12-01), Dausch et al.

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