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:
Nov. 10, 1992
Filed:
Apr. 25, 1990
Applicant:
Inventor:
Shinichi Ohi, Konan, JP;
Assignee:
Diesel Kiki Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318811 ; 388904 ;
Abstract
An apparatus for controlling a blower motor composed of a brushless motor is operative to control the blower motor, in the pulse width modulation (PWM) mode, with a number of pulses which are inversely proportional to a setting speed so as to reduce the motor operation noise and power consumption. An appropriate selection of the waveform to be supplied to the blower motor or the disturbance of the exciting timing of an exciting coil of the blower motor is effective to prevent the occurrence of a resonance phenomenon caused by vibrations produced by the blower motor.