Sensorless control system for permanent magnet synchronous machine
AssigneeLsis Co., Ltd.
InventorHak-Jun LEE
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Abstract
Disclosed is a sensorless control system for a permanent magnet synchronous machine. The sensorless control system includes a counter electromotive force estimation unit configured to estimate a counter electromotive force using a phase voltage reference applied to an inverter and a phase current applied from the inverter to the permanent magnet synchronous machine, and a speed estimation unit configured to estimate an angular velocity and an electrical angle of a rotor of the permanent magnet synchronous machine, and the counter electromotive force estimation unit according to one embodiment of the present disclosure may maintain robust performance at a low speed by modifying some portion of a conventional Luenberger observer.
Claims8
A sensorless control system for a permanent magnet synchronous machine, comprising:
- a counter electromotive force estimation unit configured to estimate a counter electromotive force of a permanent magnet synchronous machine using a phase current, which is applied from an inverter to the permanent magnet synchronous machine, and a phase voltage reference, which is applied to the inverter;
- and
- a speed estimation unit configured to estimate an angular velocity and an electrical angle of a rotor of the permanent magnet synchronous machine using the estimated counter electromotive force that is estimated in the counter electromotive force estimation unit,
- wherein the counter electromotive force estimation unit determines a state variable using the phase current that is measured from an output of the inverter.
Dependencies are inferred from the claim text.