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Your search keyword '"Niu, Shuangxia"' showing total 30 results
Start Over Author "Niu, Shuangxia" Journal ieee transactions on industrial electronics
30 results on '"Niu, Shuangxia"'

5. A High-Order Harmonic Compound Rotor Based Brushless Dual-Electrical-Port Dual-Mechanical-Port Machine

Author

Jiang, Mingyuan and Niu, Shuangxia

Abstract

The brushless dual-electrical-port dual-mech- anical-port machine (BLDDM) is increasingly developed as an effective power split device for continuously variable transmission due to its compactness and high control flexibility. However, the torque performance of BLDDM is relatively disadvantageous. In this article, a novel BLDDM using a high-order harmonic modulation is proposed to improve the torque density of BLDDMs. The key is that the compound outer rotor is artificially designed to enhance the third harmonic component of airgap flux density in the inner airgap while remaining the fundamental component unchanged in the outer airgap. The presented BLDDM is optimized and compared with the conventional design with the same structural dimensions, which shows that the proposed design has 50% higher back EMF in modulation winding and 45.7% larger torque density in the rated conditions. The machine prototype is made and tested, and the experimental results verify the feasibility and advantages of the proposed design.

Published
2024
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6. Noncooperative Metal Object Detection Using Pole-to-Pole EM Distribution Characteristics for Wireless EV Charger Employing DD Coils

Author

Niu, Songyan, Zhao, Qingyu, Chen, Haibiao, Niu, Shuangxia, and Jian, Linni

Abstract

Metal object detection (MOD) is indispensable for wireless electric vehicle charging (WEVC) systems for safety concerns. Most recently, interests are growing in MOD by electromagnetic (EM) sensing. However, current works based on EM sensing rarely target the systems with DD coils, a promising coil type for commercialization. Additionally, EM sensing schemes are mostly derived from a mindset, viz., cooperation between two sensing coils to obtain the voltage difference as a MOD criterion. Hence, undesired out-of-phase incident becomes an inherent problem jeopardizing the success rates of detection. In this article, noncooperative MOD, which solely relies on the voltages of individual sensing coils rather than cooperative ones, is proposed with absolute confidence in detection results. A unique sensing coil array is devised to suit the field characteristics of DD coils perfectly. Size-modulated patch coils are created to eliminate the undetectable zones with proper polarity configuration. Moreover, virtual double-layer sensing coils are constructed to enhance MOD's reliability. Tested by 13 different positions and three types of MOs using a 3.0-kW WEVC prototype, the induced voltages reach at least four times the threshold value. Moreover, the stability of the proposed method is verified successfully no matter the system operates in light-load or heavy-load conditions.

Published
2024
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