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. 24, 1998
Filed:
Mar. 25, 1997
Yifan Tang, St. Louis, MO (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A universal drive for a switched reluctance machine the drive obtaining a desired speed, the drive comprising means for automatically forming a magnetization table, said table containing information relating the magnetic flux, current, and rotor angle of said switched reluctance machine; means for automatically forming a rule table, the rule table containing information relating the torque of the SRM to turn-on and turn-off angles; sensors for sensing the dc bus voltage and currents of the phases of the machine; means for estimating a reference angle using information in the magnetization table and the sensed dc bus voltage and phase currents; means for obtaining the turn-on and turn-off angles from the self-tuned table based upon the desired speed; and means for turning the phase currents of the machine on at the turn-on angle in relation to the reference angle and turning the phase current off at the turn-off angle in relation to the reference angle.