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. 07, 2010
Filed:
Aug. 28, 2007
Minoru Usui, Kawasaki, JP;
Minoru Usui, Kawasaki, JP;
Fujitsu Semiconductor Limited, Yokohama, JP;
Abstract
A stepping motor controller that alleviates the CPU burden of motor control tasks. An acceleration control starter initializes a pointer register with a given start angle address upon receipt of a control start signal. Duty cycles for different motor angles are previously calculated and stored in a duty cycle memory. A duty cycle selector looks up this memory to select specific duty cycles corresponding to the angle address held in the pointer register. The stepping motor is driven with pulse signals that a pulse generator produces according to the selected duty cycles. An angle address calculator adds a given address increment to the pointer register. A revolution detector detects one revolution of the stepping motor by comparing the angle address of the pointer register with an end angle address, which permits an acceleration constant calculator to change the angular increment upon detection of one revolution.