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:
Jun. 17, 2014
Filed:
Mar. 09, 2012
Applicant:
Hiromasa Masuta, Hirosaki, JP;
Inventor:
Hiromasa Masuta, Hirosaki, JP;
Assignees:
Canon Kabushiki Kaisha, , JP;
Canon Precision Inc., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 21/00 (2006.01); H02P 27/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A motor drive apparatus that can be used to drive a wide range of brushless motors without any limit to a magnetic pole number of a rotor magnet. One rotational period T of the rotor magnet is obtained, and one period S of the sine wave drive signal according to a mathematical expression of S=T/(n/2). The one period S of the sine wave drive signal is updated at intervals of one period of the output signal from one magnetic pole detecting element among the three magnetic pole detecting elements.