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:
Feb. 18, 2003
Filed:
Aug. 16, 2001
Applicant:
Inventors:
Chia-Chang Hsu, Hsinchu, TW;
Chih-Shih Yang, Hsinchu, TW;
Assignee:
Prolific Technology, Inc., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/18 ;
U.S. Cl.
CPC ...
H02P 1/18 ;
Abstract
A method for driving a brushless DC motor is disclosed in accordance with the present invention. Firstly, a driving control signal is generated based on sensed information of a motor rotor's magnetic field distribution. The driving control signal is inactive in the case that four rotor magnetic arcs are rotated more or less than critical positions of the rotor corresponding a stator. At that time, no magnetic fields are produced from the motor's stator, and thus the rotor rotates by inertial force. In another case, the driving control signal is issued in a conventional manner.