Patent ID: 7265507
Filing Date: 2007-09-04
Classification: H02P,Y10S

Abstract:
1. For a system that derives an estimated rotor electrical position {circumflex over (θ)} r and electrical frequency {circumflex over (ω)} r for the rotor of a polyphase alternating current (AC) dynamoelectric machine with an extended rotor flux estimation calculation system that generates uncorrected estimated values of extended rotor flux {circumflex over (λ)} α ext unc and {circumflex over (λ)} β ext unc based on derived values of estimated stator flux {circumflex over (λ)} α and {circumflex over (λ)} β the α-β two-axis stationary reference frame using a lag function that approximates a pure integrator function wherein ω i represents a corner frequency of the lag function, and a digital phase lock loop (PLL) to determine values of estimated rotor electrical position {circumflex over (θ)} r and electrical frequency {circumflex over (ω)} r based upon the estimated values of extended rotor flux {circumflex over (λ)} α ext and {circumflex over (λ)} β ext , a method of correcting the estimated α-axis and β-axis values of estimated extended rotor flux to more closely approximate values generated with a pure integrator function comprising the steps of: dividing the lag function corner frequency ω i by the estimated rotary frequency {circumflex over (ω)} r to generate a signal ω i /{circumflex over (ω)} r ; multiplying the signal ω adding signal (ω