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Multiobjective Optimization of the PMSM With the Same Number of Poles and Slots Considering Dynamic Response and Torque Performance

Abstract

For several applications, such as robotic joints, it is necessary to simultaneously optimize the torque density, torque ripple, and dynamic response capability of permanent magnet synchronous machines (PMSMs). However, the method for evaluating the dynamic response capability based on the structural parameters of the machine and its co-optimization with the torque performance is not clear. Therefore, this article takes the PMSM with the same number of poles and slots as the research object and optimize these three objectives simultaneously. First, a generalized electromagnetic performance prediction model for this type of machine with different topologies is proposed based on the improved subdomain model. In addition, the evaluation model of the dynamic response capability of the PMSM is established by the mechanical and voltage equations. Based on the proposed model, the sensitivity of each parameter to the torque density, torque ripple, and dynamic response capability of the machine is analyzed, and the NSGA-II algorithm is used to optimize these three objectives simultaneously. Finally, the performance of the selected case is verified based on finite elements analysis, which is improved in all three objectives.

article Article

date_range 2024

language English

link Link of the paper

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Yang Jiutong

Chen Jinhua

Liu Wei

Qiu Shuheng

Yang Guilin

Zhang Chi

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Featured Keywords

Electromagnetics

Torque

Predictive models

Optimization

Mathematical models

Windings

Vehicle dynamics

Dynamic response capability

multi-objective optimization

permanent magnet synchronous machines (PMSMs) with the same number of poles and slots

torque performance

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Effect of corrosion on flexural strength of reinforced concrete beams with polypropylene fibers

Abstract

An experimental study was performed to investigate the effects of polypropylene fibers on uncorroded and corroded reinforced concrete beams. Three different volume fractions of polypropylene fibers having 0, 0.5, and 1.5%, were tested at four corrosion levels of 0% and approximately 5, 7, and 9%. A full scale of an accelerated corrosion pool was used for the accelerated corrosion process. Reinforced concrete beams were used for an under monotonic bending test. The contribution of the actual corrosion levels of transverse and longitudinal reinforcement bars to the total corrosion levels were obtained from reinforcement bars fully extracted from concrete. Flexural strength, bond-slip, and moment-curvature relationships were examined for uncorroded and corroded reinforced concrete beams. A new model was developed to predict the flexural strength of corroded reinforced concrete beams. The proposed model for predicting the residual flexural strength of corroded beams was compared with test data published in previous studies. Furthermore, a novel model is presented for improved predictions between the actual and theoretically estimated corrosion mass losses, based on Faraday’s law, with the aid of fully extracted reinforcement bars. The model used to predict the flexural strength of corroded reinforced concrete beams with large sizes demonstrated good agreement with current and previously published literature data. In the case of corroded beams comprising differing amounts of polypropylene fibers, the performance of the corroded beams was limited by a fiber volume fraction of 1.5% at low corrosion levels.

article Article

date_range 2018

language English

link Link of the paper

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