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:
Dec. 27, 1994
Filed:
Nov. 01, 1991
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
Disclosed is a speed controller of a motor which comprises a rotation sensor for generating an A.C. signal having a period in accordance with a rotating speed of a motor; speed detection device for effecting detection operations a plurality of times per round of the motor by the A.C. signal of the rotation sensor; compensation device for generating a control signal on the basis of a detection signal of the speed detection device; and driving device for driving the motor in accordance with the control signal of the compensation device; wherein the compensation device includes rotation error detection device for obtaining a rotation error responsive to the detection signal of the speed detection device; memory device for storing a memory value; memory output value generation device for generating a memory output value by the use of the memory value of the memory device; filter device for obtaining a calculation error from the rotation error; renewing and storing device for renewing and storing substantially sequentially the memory value of the memory device by a renewed value corresponding to a value obtained by calculating and synthesizing the calculation error and the memory output value whenever the speed detection device effects Q times detection operations; and control signal generation device for generating a control signal responsive to the rotation error of the memory output value.