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, 1998
Filed:
Apr. 06, 1993
Toru Araki, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of controlling operation of a DC motor including the steps of detecting the level of acceleration caused by the rotation of the output shaft of the DC motor; determining the square root of the detected level of acceleration; and supplying the DC motor with a driving voltage which is determined in accordance with the difference between the square root of the acceleration and a voltage command. This method is carried out by an apparatus which includes a power supply for supplying an electric power to the DC motor; a rotary member rotatable in accordance with the rotation of the output shaft of the DC motor; an acceleration sensor provided on the rotary member for detecting the acceleration of acting on the rotary member; a square root circuit for computing the square root of the output from the acceleration sensor; and a differential amplifier circuit for supplying the DC motor with a voltage which is determined in accordance with the difference between the voltage of the power supply and the output voltage of the square root circuit.