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:
Sep. 15, 1992
Filed:
Aug. 29, 1990
Hideki Adachi, Kawasaki, JP;
Mitsuharu Takizawa, Fuchu, JP;
Miho Nakayama, Tokyo, JP;
Taisei Fukada, Yokohama, JP;
Shinichi Nakamura, Kawasaki, JP;
Satoshi Kuroyanagi, Nishimine, JP;
Hisatsugu Tahara, Kawasaki, JP;
Hiroshi Ozaki, Tokyo, JP;
Masanori Miyata, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus and method for controlling the velocity of a motor controls the motor by fuzzy inferential reasoning in a transitional period when the motor is started, changed in speed, reversed or stopped. Such fuzzy control eliminates an increase in the length of the transitional period caused by a limitation in supply current under conventional PLL control and makes possible a rapid transition to a target velocity. A plurality of fuzzy rules are provided and one of these fuzzy rules is selected in accordance with the length of the previous transitional period, thereby suppressing the effects of load fluctuation and the influence of a fluctuation in torque caused by a rise in temperature. Therefore, the length for transitional control of a motor can be shortened and the apparatus can be reduced in size.