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:
Jan. 10, 1989
Filed:
Nov. 27, 1987
Applicant:
Inventors:
Jack W Savage, Centerville, OH (US);
John R Savage, Kettering, OH (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16D / ; H02P / ;
U.S. Cl.
CPC ...
318254 ; 318-9 ; 318558 ; 123 4149 ; 464 29 ;
Abstract
A multiple cooling fan installation in which a master fan is driven by a brushless electric drive motor, and at least one slave fan having blades positioned adjacent the blades of the master fan is driven by magnetic coupling between such adjacent blades. Synchronism of rotation between the master and slave fans is ensured by generating a speed command N.sub.cmd for the master fan drive motor in relation to position feedback from the slave fan(s) so that the speed of the master fan is increased in relation to the ability of the slave fan(s) to follow in step with the master fan.