Low Speed Open Loop Field Oriented Control for Permanent Magnet Machines
Authors
Pérez Soriano, Tatiana ; Fernández Martínez, Javier
Term
4. term
Education
Publication year
2011
Submitted on
2011-05-30
Pages
93
Abstract
Styring af AC-drev (elektriske motorsystemer) uden fysiske hastigheds- eller positionssensorer – kaldet sensorløs kontrol – er blevet undersøgt i mange år, men det er stadig udfordrende ved stilstand (nul hastighed), især for overflademonterede permanente magnet-synkronmaskiner (sPMSM), som har meget lille magnetisk saliens (markante kendetegn i magnetfeltet, der hjælper med at estimere rotorens position). Dette projekt har til formål at udvikle en sensorløs styring til en sPMSM, der kan fungere ved nul og lave hastigheder. Vi gennemgår eksisterende sensorløse strategier og vurderer en foreslået estimator med simuleringer og laboratorieforsøg under forskellige driftsforhold. Estimatoren viser stabil ydelse ved lave hastigheder, også under belastning. En højfrekvent signalinjektionsmetode implementeres med en Danfoss-strømomformer, dSPACE og MATLAB/Simulink. Til sammenligning udføres der også simuleringer og eksperimenter i lukket kredsløb.
Controlling AC drives (electric motor systems) without physical speed or position sensors—known as sensorless control—has been studied for years, but it remains difficult at standstill (zero speed), especially for surface-mounted Permanent Magnet Synchronous Machines (sPMSM), which offer little magnetic saliency (distinctive features in the magnetic field that help estimate rotor position). This project aims to develop a sensorless control approach for an sPMSM that can operate at zero and low speeds. We review existing sensorless strategies and evaluate a proposed estimator through simulations and laboratory tests under various operating conditions. The estimator shows stable performance at low speeds, including under load. A high-frequency signal injection method is implemented using a Danfoss power converter, dSPACE, and MATLAB/Simulink. For comparison, simulations and experiments are also conducted in closed-loop configurations.
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