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:
Oct. 26, 2004
Filed:
Sep. 28, 2001
Applicant:
Inventors:
Naruhiko Kudo, Toshima-ku, JP;
Masato Murata, Toshima-ku, JP;
Assignee:
Sanyo Denki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 1/24 ; H02P 1/42 ; H02P 3/18 ; H02P 5/28 ; H02P 7/36 ;
U.S. Cl.
CPC ...
H02P 1/24 ; H02P 1/42 ; H02P 3/18 ; H02P 5/28 ; H02P 7/36 ;
Abstract
A drive unit for a brushless fan motor capable of easily controlling the rational speed of the motor without using PWM control. A power control circuit is provided for controlling the rational speed of the rotor by controlling the on/off operation of power feed semiconductor switch. The actual rotational speed of the rotor is compared with the target rotational speed. Based on the compared values, the turn-off time of the power feed semiconductor switch is controlled so that the rotational speed of the rotor may reach the target rotational speed fast and smoothly.