DC motor control in electronic sewing machine
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United States of America Patent
Stats
-
Aug 23, 1994
Issued Date -
N/A
app pub date -
May 19, 1992
filing date -
Jun 16, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A load of an electronic sewing machine is self-diagonosed by a control system to cause a DC motor to be operated under control to drive upper and lower shafts of the sewing machine. The control system includes an evaluating device to which a voltage value applied to the DC motor and a rotating speed of the DC motor, both detected, are inputted for determining a current value supplied to the DC motor and a power loss of the DC motor. These data are supplied to a fuzzy inference unit for inferring an optimum rotating speed of the DC motor. A control command signal representing an excessive degree of the actual power loss in reference to the rated power loss is outputted from the fuzzy inference unit to the DC motor for the control of the electric power to be supplied thereto.
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