The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 1991
Filed:
Mar. 19, 1990
Akira Orii, Hachioji, JP;
Janome Sewing Machine Industry Co., Ltd., Tokyo, JP;
Abstract
A load of an electronic sewing machine is self-diagnosed 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 theory applying device for estimating if the power loss of the DC motor exceeds a rated value by application of a prescribed fuzzy rule. A control command signal representing an amount of the excessive power loss is outputted from the fuzzy theory applying device to the DC motor for the control of the applied voltage. No need to directly measure the current value, and therefore no need to provide a current detecting resistor in a control circuit.