Modified Technique of Parameter Identification of a Permanent Magnet Synchronous Motor with PWM Inverter in the Presence of Dead-Time Effect and Measurement Noise

Abstract

The paper considers the problem of parameter identification of the surface mounted permanent magnet synchronous motor (SPMSM) with pulse width modulated (PWM) inverter in the presence of dead time of power switches and other nonlinear distortions. Parameter identification of the SPMSM is required for the tuning of the torque control loop, because in some cases, the exact values of phase resistances and inductances are not known. In the absence of nonlinear disturbances, the problem of SPMSM parameters estimation is not difficult. The influence of the dead-time effect, back electromotive force and measurements noise introduces distortions in experimental output data sets, which leads to incorrect parameter estimation. Thus, there is a need to develop new designs of identification experiments and methods of processing of the experimental data. A detailed mathematical model of SPMSM with a PWM inverter in the presence of dead-time effect is considered in the paper. The negative influence of the dead-time effect on the results of parameter estimation is shown. A modified technique of parameter identification of SPMSM based on the estimation of frequency response function is proposed. The applied design of identification experiments, the type of excitation input signal, and methods of data processing allow us to minimize the influence of nonlinear disturbances and to reduce the variance of estimation of frequency response function. These features provide a high performance of SPMSM parameters estimation.

Torque Control Oriented Modeling of a Brushless Direct Current Motor (BLDCM) Based on the Extended Park's Transformation

“…The inverter transforms the direct current into the three-phase current using variable frequency and then supplies the coils of the motor successively to create a rotary field, then the rotation that we are looking for [8][9][10]. In order to model the motor, some authors, build the model of BLDCM using the principle of Hall effect sensors, when these sensors are located to the rotor shaft [11,12].…”

“…at the Clark reference frame ( ).k and μ present the compensations of the variables after transformation (d, q).Hence the electrical equations in Park's reference frame are presented in Eqns (8). and(9).…”

Influence of PWM Torque Control Frequency in DC Motors by Means of an Optimum Design Method

“…The main benefit of the proposed method is the ability to improve the efficiency of the system. Aleksandr et al [4] considered the problem of parameter identification of the surfacemounted permanent magnet synchronous motor (SPMSM) with pulse width modulated (PWM) inverter based on the estimation of the frequency response function for the tuning of the torque control loop. Shih et al [5] designed a form of linearization based on forwarding difference and bilinear approximation might be able to maintain the FOC stability if the inductance parameter is perfectly estimated.…”