Patent ID: 7098623
Filing Date: 2006-08-29
Classification: H02P

Abstract:
1. A method for sensorless estimation of rotor speed and position of a permanent magnet synchronous machine the method comprising the steps of forming a voltage model of the permanent magnet synchronous machine, forming a flux model of the permanent magnet synchronous machine, measuring stator currents of the permanent magnet synchronous machine, defining stator voltages of the permanent magnet synchronous machine, calculating first stator flux vector estimate ({circumflex over (ψ)} calculating second stator flux vector estimate ({circumflex over (ψ)} 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)} using the estimate for the rotor angular speed ({circumflex over (ω)} injecting a known voltage signal (u detecting a current signal (i 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)}