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:
Aug. 29, 2006
Filed:
Oct. 26, 2005
Antti Piippo, Espoo, FI;
Antti Piippo, Espoo, FI;
ABB OY, Helsinki, FI;
Abstract
A method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine the method comprising the steps of calculating first stator flux vector estimate ({circumflex over (ψ)}+j{circumflex over (ψ)}) using the flux model and measured stator currents, calculating second stator flux vector estimate ({circumflex over (ψ)}+j{circumflex over (ψ)}) using the voltage model and measured stator voltages, comparing the directions of the first and second flux vectors to achieve a first error signal (F), using speed adaptation to achieve estimates for the rotor angular speed ({circumflex over (ω)}) and angular position ({circumflex over (θ)}) from the first error signal (F), injecting a known voltage signal (u) to the stator voltage, detecting a current signal (i) from the stator current to form a second error (ε) signal, which is dependent on the estimation error of the rotor position, augmenting the voltage model by the second error signal (ε) to keep the first and second flux vector estimates aligned and so to correct the rotor angular speed ({circumflex over (ω)}) and angular position ({circumflex over (θ)}) estimates.