Abstract
The paper proposes a method for assessing the active resistance and inductance of a permanent magnet synchronous motor (PMSM) by means of an electric drive, which makes it possible to reduce the influence of magnetic circuit nonlinearities and "dead" time nonlinearities. The proposed method is based on the sensitivity function of transfer functions to changes in parameters, frequency analysis and an optimization algorithm, which makes it possible to analyze and select such frequencies and signals at which the effect of certain nonlinearities is the least. The proposed algorithm has shown good simulation results on refined models taking into account the influence of "dead" time and magnetic circuit nonlinearity. Experimental data have confirmed the effectiveness of the proposed method. In the experiment, the parameters measured by specialized devices (LC-meter and milliohmmeter) were used as reference parameter values. The discrepancy between the estimated and measured parameters did not exceed 5%, which shows a good estimation accuracy. This method can be used to configure the control system, as well as to build a system for test diagnostics of the technical condition of the PMSM.
Keywords
Parameters identification, PMSM, permanent magnet synchronous motor, frequency analysis, frequency method, sensitivity function, optimization method, nonlinearities, saturation of the magnetic circuit, "dead" time.
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