Patent ID: 7072790

Claim:
A method of detecting rotor angular position and velocity sensing for a polyphase alternating current (AC) dynamoelectric machine comprising the steps of: measuring the AC currents and potentials applied to a stator of the dynamoelectric machine; transforming the measured currents and potentials to a two-phase α-β stationary frame to produce transformed currents I α ,I β and transformed potentials V α ,V β ; multiplying the transformed currents I α ,I β by the resistance R s of the stator to produce signals I α *R s ,I β *R s ; subtracting the signals I α *R s ,I β *R s from the respective transformed potentials V α ,V β to produce signals V α ,−I α *R s ,V β −I β *R s ; multiplying signals V α −I α *R s ,V β −I β *R s ; by a lag function 1 s + ω i , wherein ω i is a selected corner frequency for the lag function, to produce signals 1 s + ω i ⁢ ( V α - I α * R s ) , 1 s + ω i ⁢ ( V β - I β * R s ) ; multiplying the transformed currents I α ,I β by the q-axis inductance L q of the stator to produce signals I α *L q ,I β *L q ; subtracting the signals I α *L q ,I β *L q from the respective signals 1 s + ω i ⁢ ( V α - I α * R s ) , 1 s + ω i ⁢ ( V β - I β * R s ) to produce signal 1 s + ω i ⁢ ( V α - I α * R s ) - I α * L q , 1 s + ω i ⁢ ( V β - I β * R s ) - I β * L q that correspond to extended rotor flux values λ ext — α ,λ ext — β ; and applying the extended rotor flux values λ ext — α ,λ ext — β to a phase lock loop (PLL) to derive estimated rotor angular position and velocity values {circumflex over (θ)},{circumflex over (ω)} for the dynamoelectric machine.