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. 27, 1987
Filed:
Apr. 07, 1986
Applicant:
Inventor:
Johannes H Janssen, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318139 ; 318439 ;
Abstract
A brushless d.c. motor comprises a commutation device by means of which the stator coils are connected to and disconnected from a direct-voltage source in a cyclic switching pattern for energizing said stator coils. In order to reduce torque variations as a result of transient effects in the energizing currents during commutation, the commutation device comprises means which cause the instants of disconnection and connection to be shifted by a fixed time interval relative to one another.