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Sensorless control of synchronous permanent magnet motors by signal injection

Abstract : This thesis addresses the problematic of sensorless low speed operation of permanent magnet synchronous motors (PMSM) by signal injection. We focus on the effects of magnetic and cross saturations because their compensation is paramount to solve this problematic. We propose an original way of modeling magnetic saturation using an energy approach (Lagrangian and Hamiltonian formulations), where the physical symmetries are exploited to simplify the expression of the magnetic energy. Experimental data show that a simple polynomial of degree 4 is sufficient to describe accurately magnetic saturation effects. Then we propose a clear and original analysis based on second-order averaging of how to recover the position information from signal injection (using the proposed model). We give an explicit relation between stator current ripples and rotor position; this relation is used in real time operation. Such magnetic saturation model and the resulting position estimates were tested and validated on two types of motors: with interior and surface permanent magnets (IPM and SPM). Experimental results obtained on a test bench show that estimation errors of the rotor position do not exceed few electrical degrees in the low speed operating domain.
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Submitted on : Friday, April 26, 2013 - 5:27:07 PM
Last modification on : Monday, June 27, 2022 - 3:06:51 AM
Long-term archiving on: : Saturday, July 27, 2013 - 5:20:16 AM


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  • HAL Id : pastel-00818400, version 1


Al Kassem Jebai. Sensorless control of synchronous permanent magnet motors by signal injection. General Mathematics [math.GM]. Ecole Nationale Supérieure des Mines de Paris, 2013. English. ⟨NNT : 2013ENMP0003⟩. ⟨pastel-00818400⟩



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