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Full-Speed Region Predictive Current Control Method of Symmetrical Series-Winding PMSM With Higher DC-Link Utilization

Abstract

The series-end winding permanent magnet synchronous motor (SW-PMSM) drive system is ideal for applications with limited dc-link voltage. However, the controller design in the full-speed region for SW-PMSM is challenging because of the additional harmonic current subspaces. The harmonic currents and voltages affect the accurate solution for the optimal current set point in the full-speed region. This article provides an online full-speed region predictive current controller that considers harmonic current subspaces. First, three voltage limits are proposed to identify the specific operation regions. Then, the carrier-based pulsewidth modulation scheme in the full-speed region is discussed. Third, Newton's method solves the optimized current set points for different operation regions. Finally, the predictive current controller is utilized to realize the current trajectory in all subspaces. The performance of this method is verified with a five-phase SW-PMSM. DC-link utilization can increase by 17.6%, and the proposed method's copper losses are compared.

article Article

date_range 2024

language English

link Link of the paper

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Liu Senyi

Liu Yuxin

Zhang Bowen

Liu Chunhua

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Featured Keywords

DC link

multiphase machine

permanent magnet synchronous motor (PMSM)

predictive control

series-winding topology

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Assessment of reinforced concrete building damages following the Kahramanmaraş earthquakes in Malatya, Turkey (February 6, 2023)

Abstract

Earthquakes of magnitude Mw = 7.7 and Mw = 7.6 hit the city of Kahramanmaraş (Turkey) on 6 February 2023. These earthquakes caused serious damage in 11 provinces in Turkey resulting in over 50,000 deaths and huge economic losses with the collapse of thousands of buildings. Two consecutive devastating earthquakes have severely damaged the reinforced concrete building stock located in Malatya. There are many reasons reinforced concrete structures suffer damage under the influence of seismic loads. These reasons can be listed as material and section properties that do not comply with earthquake codes, workmanship defects, ground parameters that are not considered and design errors, as seen in field investigations after earthquakes in Turkey in the past. In this research, a field study was conducted on reinforced concrete buildings damaged after the earthquakes in Malatya province. The causes of structural damages in reinforced concrete buildings between 6–26 years of age were assessed in terms of design and material defects. The structural damages were mainly caused due to insufficient stirrups in structural members, short column, strong beam–weak column, failures of infill walls, soft story type collapse, poor concrete quality, and reinforcement corrosion. In addition to the field investigation, the spectrum relationships created using raw acceleration data obtained from DEMP (Disaster and Emergency Management Presidency) stations in Malatya province were compared with the design response spectra.

article Article

date_range 2024

language English

link Link of the paper

Collapsed buildings

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