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PARAMETRIC IDENTIFICATION OF A SERVO DRIVE MODEL WITH DEADTIME-TYPE NONLINEARITIES

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An approach to automatic identification of electrical parameters of a servo drive and a PWM inverter, based on least squares method, is proposed. It is noted that existing methods of parametric identification of servo drives use a linear mathematical model of the object and do not consider nonlinearity, due to the "dead time" and the voltage drop on the power switches of the converter. The output voltage of the PWM inverter is significantly distorted due to these features, which deteriorate the identification results. The proposed identification method uses a model that considers the deadtime effect and the voltage drop on the converter power switches. The new method is shown to enable a higher accuracy of parameter estimation than the method with linear servo drive model.

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