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:
Jul. 14, 2009
Filed:
Jun. 14, 2007
Janne Salomäki, Hyvinkää, FI;
Antti Piippo, Espoo, FI;
Janne Salomäki, Hyvinkää, FI;
Antti Piippo, Espoo, FI;
ABB Oy, Helsinki, FI;
Abstract
A method and a system in connection with a speed and position sensorless permanent magnet synchronous machine equipped with an output filter and driven by an inverter, which method comprises the steps of forming a speed-adaptive full-order observer based on the dynamic model of the combination of the permanent magnet synchronous machine (PMSM) and the output filter, measuring the inverter output current (i), estimating inverter output current (î), determining the estimate for the electrical angular speed ({circumflex over (ω)}) using the estimated and measured inverter output currents (î, i) in an adaptation law, injecting a voltage signal (u) into the inverter voltage reference (u) to obtain a modified voltage reference (u), detecting an error signal (ε) from the measured inverter output current (i), and calculating the speed correction term (ω) used in the adaptation of the observer from the error signal (ε).