Speed controlling system and a predictor

U.S. Patent Number: 5392378

Abstract: A predictor (20) and a learning device (20) are newly provided to a conventional speed controlling system for a rotating body, according to the present invention. The predictor predicts an instantaneous speed error on the basis of a plurality of speed errors to enable elimination of a phase delay due to sampling. The learning device is effective to remove torque ripple components of a motor on the basis of the speed errors. As a result, it is possible to expand a speed controlling region of the motor and to decrease irregularlity in rotation of the motor to a great extent. The predictor solely makes it possible to obtain a present accurate rate of change of data previously sampled from a plurality of sampled data, whereby a phase delay due to digital processes may be prevented.

Inventors: Tohyama; Yasuaki (Kyoto, JP)

Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)

Application Number: 08/170,653

Issued: 1995-02-21

Expired: 2007-02-21

Classes: 388/803 ; 318/632; 388/902; 388/907.5

Field of search: 318/632,633,254,138,439,600,567,568,571 388/800,803,806,807,815,902,906,907.5,909,930

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