Electrical motor monitoring system for a domestic appliance
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 24, 1991
Issued Date -
N/A
app pub date -
Mar 30, 1990
filing date -
Apr 18, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive system for an automatic washer or dryer having a rotatable drum about a horizontal axis. An induction motor drives the drum and is connected to and disconnected from a source of alternating voltage by a microprocessor to control the speed of the motor. The microprocessor senses the zero crossing of the alternating voltage and the zero crossing of alternating current flowing in the motor to determine the time to connect the motor to the alternating voltage. The microprocessor analyzes successive readings of the motor's back emf to detect undesirable load distributions and effect redistribution.
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Family
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Cited Art Landscape
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