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. 19, 1994
Filed:
May. 06, 1993
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318439 ;
Abstract
In a brushless motor, the frequency of an output signal of a synchronizing signal generation unit, a duty ratio in a synchronized operation mode and a duty ratio in a rotator position detection operation mode are set such that a rotating speed in the rotator position detection operation mode becomes equal to or lower than a rotating speed in the synchronized operation mode, thereby enabling smooth change-over from the synchronized operation mode to the rotator position detection operation mode.