Electricity: motive power systems – Synchronous motor systems – Synchronization systems
Patent
1993-04-13
1994-03-22
Shoop, Jr., William M.
Electricity: motive power systems
Synchronous motor systems
Synchronization systems
318721, 318809, H02P 146
Patent
active
052967948
ABSTRACT:
An identity state observer for a smooth-rotor permanent-magnet synchronous motor is derived which reconstructs the electrical and mechanical states of the motor from current and voltage measurements. The observer operates in the rotor frame and estimates direct and quadrature stator currents, rotor velocity, and rotor position. Since the rotor position is estimated, the rotor reference frame is approximated using the latest rotor position estimate. The motor dynamics and the transformation into the estimated rotor frame are nonlinear and thus the observer and observer error dynamics are nonlinear. Therefore, small signal stability is analyzed from a linearized model. Simulations including realistic measurement disturbances are used to investigate the global stabilitiy and accuracy of the observer.
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Jones Lawrence A.
Lang Jeffrey H.
Cabeca John W.
Massachusetts Institute of Technology
Shoop Jr. William M.
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