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. 19, 1999
Filed:
Jul. 14, 1998
Applicant:
Inventors:
Assignee:
STMicroelectronics S.r.l., Agrate Brianza, IT;
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
318254 ; 318138 ; 318439 ; 318430 ; 318431 ; 318721 ; 318722 ; 318802 ;
Abstract
The sensing of the rotor position for synchronizing the drive of a multi-phase brushless motor when driven in a 'multi-polar' mode is carried out by interrupting the driving current in at least one of the windings of the motor coupled with a zero-cross sensing circuit of the BEMF signal. This done by using a first logic signal, enabling a logic gate for asserting a zero-cross event detected by the circuit by a third logic signal, and simultaneously resetting the first signal and the third signal after a certain period of time from the instant of interruption.