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:
May. 04, 2010
Filed:
Nov. 14, 2005
Applicant:
Masayuki Takada, Aichi, JP;
Inventor:
Masayuki Takada, Aichi, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
Current control circuit controls an output voltage of DC power supply so as to increase current passing through inverter circuit as the motor increases its the speed. The control offers an RPM—torque characteristic of the motor in which torque increases as the RPM increases. By virtue of the RPM—torque characteristic, a ventilating device employing brushless DC motor exhibits preferable air quantity—static pressure characteristic where less change in air quantity is expected even when a pressure loss—outside wind pressure, duct length or the like—varies.