Comparison of IPMSM Parameter Estimation Methods for Motor Efficiency

Glac, Antonin; Šmı́dl, Václav; Peroutka, Zdeněk; Hackl, Christoph M.

doi:10.1109/iecon43393.2020.9254465

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Voltage overmodulation increases the size of the voltage-limiting ellipse, which means that the range of selectable current operating points is widened. Then, the current operating point can be selected from the wide area in order to increase the driving efficiency [19][20][21][22].…”

Section: Voltage Overmodulationmentioning

confidence: 99%

A Study on the Optimal Control of Voltage Utilization for Improving the Efficiency of PMSM

et al. 2022

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When performing weak flux control to drive a permanent-magnet synchronous motor at high speed, the efficiency is lowered because the copper loss increases as the negative D-axis current increases. In addition, if the overmodulation index is slightly lowered and driven without setting it to the maximum value, the phase current ripple reduction effect can be expected compared to the six-step control. Therefore, if the motor is operated at a current point that can minimize the sum of copper loss and iron loss, the motor can be driven with maximum efficiency. In addition, if the overmodulation index is slightly lower than that of the six-step control, the phase current ripple can be reduced. This paper proposes a method for finding an overmodulation index to maximize driving efficiency when driving a motor based on the magnetic flux–torque command. In addition, an algorithm for driving a motor with maximum efficiency by applying an optimal overmodulation index table is proposed. Based on the MATLAB Simulink simulation, the efficiency change characteristics according to the overmodulation index change are reviewed, and the efficiency improvement and current ripple reduction effects are verified through a dynamometer experiment.

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Section: Voltage Overmodulationmentioning

confidence: 99%

A Study on the Optimal Control of Voltage Utilization for Improving the Efficiency of PMSM

et al. 2022

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“…Adaption of evaluation of the optimal operating conditions of [8] for time-varying parameters has been presented in [11]. The dependence of motor efficiency on the quality of the estimator was demonstrated in [12].…”

Section: Introductionmentioning

confidence: 99%

“…The goal of this study is to assess if a combination of existing online parameter estimation methods with a feed-forward model-based controller is able to improve the efficiency of an IPMSM. In this paper, the results from [12] are extended by considering a wider range of parameter identification methods on the efficiency of the machine and analyze the source of errors. Specifically, we will investigate two offline methods, the flux linkage map (FLM) identification (see Section 2.2.1) [13][14][15] and the frequency domain identification at standstill (see Section 2.2.2) to obtain the stator inductance values.…”

Section: Introductionmentioning

confidence: 99%

Dependence of IPMSM Motor Efficiency on Parameter Estimates

et al. 2021

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The efficiency of an IPMSM motor is influenced by the operating point of the machine. Conventional approaches to generate measured efficiency maps may be too expensive to use in some situations, thus it often replaced by simpler variants based on parametric models. A promising approach is to combine model-based approaches with online parameter identification methods which would allow following changes of the parameters. However, such approaches may also result in deteriorated performance if the online parameter estimation is inaccurate. We present a systematic experimental study of the influence of the parameter estimates on the efficiency of a 4.5 kW IPMSM drive and analyze the sources of inaccuracy. The first outcome of this study is that none of the tested methods performs well when the machine is fully loaded, which deteriorates overall performance. The second outcome is that the conventional maximum torque per ampere/current (MTPA/MTPC) is not an accurate optimization criterion. The overall performance of the compared methods thus heavily depends on the testing profile. When a significant part of the profile is at full load, the methods based on online estimation are unsuitable and parameters estimated offline using frequency domain provides better efficiency under the maximum torque per current control strategy.

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