Bleaching and dyeing; fluid treatment and chemical modification – Fluid treatment – Manipulation of liquid
Patent
1997-01-27
1998-09-29
Coe, Philip R.
Bleaching and dyeing; fluid treatment and chemical modification
Fluid treatment
Manipulation of liquid
68 1202, 68 1212, 68 1214, 68 1216, D06F 3302
Patent
active
058130691
ABSTRACT:
A motor control method for an automatic washer having an electronically commutated motor (ECM) serving as a power source, the ECM being serially connected to a washing axle and a drying axle without decreasing a spinning rate of the ECM, includes the steps of judging, when a position of the ECM is sensed from a Hall sensor input, whether the automatic washer is set in a washing mode or in a drying mode, determining a spinning direction command signal if the automatic washer is set in the washing mode, calculating a driving logic at a specific moment angle applicable to the washing mode in the spinning direction command signal, calculating a speed command signal in the ECM and a voltage command signal at a real speed value, modulating a pulse width of the voltage command signal in the driving logic, and outputting the pulse width modulated voltage command value. The method enables the ECM to provide a low speed and high torque in a washing mode region and a high speed and low torque in a drying mode region.
REFERENCES:
patent: 4642536 (1987-02-01), Boyd, Jr. et al.
patent: 5671493 (1997-09-01), Moon
patent: 5682634 (1997-11-01), Cheong et al.
Coe Philip R.
LG Electronics Inc.
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