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:
Apr. 25, 2000
Filed:
Dec. 17, 1998
Applicant:
Inventor:
Kiyoto Toyoizumi, Odawara, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318705 ; 318721 ; 318722 ; 318724 ;
Abstract
A digital motor drive control system comprises drive means for performing phase switching by use of the phase timing signal from phase switching timing generating means and driving of the motor in response to a PWM clock signal generated by PWM signal generating means where means is provided for synchronizing the PWM clock signal of the PWM signal generating means with a phase switching timing. The number of PWM clock pulses of each phase of the motor is made equal to each other, so that rotational irregularities of the motor are decreased.