Flux observer in a sensorless controller for permanent...

Details Flux observer in a sensorless controller for permanent... Flux observer in a sensorless controller for permanent...

2005-01-11

2005-01-11

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S254100, C318S132000, C318S434000, C318S610000, C318S799000

Reexamination Certificate

active

06841969

ABSTRACT:
A control system includes a field oriented controller that receives a torque command and that generates phase voltages for an electric machine. A first transformation module receives stator terminal currents and generates d-axis and q-axis stationary frame currents. An open loop flux observer receives d-axis and q-axis stationary frame voltage commands and the d and q-axis stationary frame currents. The open loop flux observer includes a vector cross product calculator that generates an error signal that is proportional to an angular difference between an estimated stator flux and a computed stator flux and a proportional integral controller that generates an estimated rotor angular position based on the error signal. A second transformation module receives the d-axis and q-axis stationary frame currents and the estimated rotor angular position and generates d-axis and q-axis synchronous reference frame feedback currents that are output to the field oriented controller.

REFERENCES:
patent: 5903129 (1999-05-01), Okuno et al.
patent: 6462491 (2002-10-01), Iijima et al.
patent: 6492788 (2002-12-01), Agirman et al.
patent: 20020149331 (2002-10-01), Marcinkiewicz
patent: 20040007995 (2004-01-01), Fu

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