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:
Jun. 28, 1994
Filed:
Jun. 15, 1992
Andreas J Diethert, Berlin, DE;
Claudia M Schmidt-Milkau, Simsbury, CT (US);
Otis Elevator Company, Farmington, CT (US);
Abstract
During motor jerk-out, the real component of a stator current ReI is measured as an approximation to torque current I.sub.T, and a reference acceleration A.sub.ref is obtained as an approximation to the motor acceleration, for providing, by means of linear regression, the Y intercept of a line defining the relationship between ReI and A.sub.ref, which intercept defines ReI at a constant high speed (ReI.sub.CONSTANT HIGH SPEED) for linearly relating ReI.sub.CONSTANT HIGH SPEED to a compensation frequency f.sub.comp, which is provided to a summer for summing f.sub.comp with a reference frequency f.sub.ref used for dictating motor speed. The stator current I and A.sub.ref are sampled during jerk-out when the motor is at high speed because there the real component of the stator current ReI is approximately equal to I.sub.T.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile