This paper presents a theory and an experimental evaluation of robust control algorithm for permanent magnet synchronous machine (PMSM) speed drive fed by voltage source inverter. A simple control model is first obtained by performing field orintation through a nominal linearizing stste feedback. Then, the robust control algorithm based on pole placement is applied to the PMSM in order to deal with plant uncertainties. The adopted method uses the notion of geometric stability and the multi-model approach in order to synthesis the state regulation by robust pole placement. To show the validity of our control approach. DSP based experimental results are presented. These results are very satisfactory and prove the feasibility of our control algorithm.
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