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Chen Haijun,Guo Tengteng,Zhang Lufeng 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
Five-phase fractional slot concentrated winding permanent magnet (FSCWPM) machine with equal/unequal stator teeth can improve the torque density by added third harmonic current injection (Sin + 3rd). However, the injection of the third harmonic current will change the stator, rotor, and PM losses, and thus the thermal distribution. Therefore, it is necessary to conduct a comparative study on the losses and the thermal performances of the fi ve-phase FSCWPM machine with the sine current supply and Sin + 3rd current supply. In this paper, the structures of the fi ve-phase FSCWPM machines with equal/ unequal stator teeth are illustrated, and their losses characteristic at diff erent rotating speeds including copper loss, PM loss, and iron-core loss are comparatively analyzed under the same output torque constraint. Then, their thermal distributions are investigated based on the coupling of electromagnetic-thermal calculation of the 3D fi nite element (FE) method. The results demonstrate that the fi ve-phase FSCWPM machines energized with the Sin + 3rd current have a better thermal performance at a low rotating speed, especially the fi ve-phase FSCWPM machine with unequal stator teeth. Furthermore, the thermal experiment concerning a fi ve-phase FSCWPM machine with unequal stator teeth is conducted to verify the validity of the related analysis.
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Preparation and Performance of Road Micro-surfacing Materials with Exhaust Purification Function
Chaohui Wang,Hao Fu,Qian Chen,Xiaolong Sun,Tengteng Guo,Jin Guo 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
Road micro-surfacing materials with exhaust purification function were developed to purify and alleviate serious air pollution in cities. Two types of functional materials satisfied the basic performance requirements of aggregates and fillers were selected to develop micro-surfacing materials with exhaust purification function. Test equipment for exhaust purification effect was invented, and test methods were proposed. The exhaust purification effect involved in functional micro-surfacing materials was comprehensively investigated. The road performance was also evaluated. Finally, the exhaust purification mechanism of functional micro-surfacing materials was revealed. Results showed that the purification rates of gaseous pollutants (COx, NOx, and SO2) and particulate pollutants (PM 2.5 and PM 10) were above 15% and 50%, respectively based on indoor heating and cooling intervals, and that of outdoors were 20% and 40%. The functional micro-surfacing materials exhibited satisfactory road performance. Moreover, the self-polarization effect of the functional materials contributed to the exhaust purification effect.
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