Abstract
The application of state observer structures in digital current closed-loop control based on integer operation for permanent magnet synchronous motor (PMSM) is considered. The state observer predicts the currents, and overcomes the filter delay as it suppresses the noise of samples. Accordingly, the resulting control structure is shown to heighten the response frequency and to improve disturbance rejection capabilities. Experimental result generated by a prototype controller demonstrates the predictable effects of state observer and the improvement of system performance. And the influence of parameter variation on the observer response characteristic and system performance is discussed.
