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RISS 인기검색어
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- 주제어 : Torque ripple suppression (검색결과 4 건)
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Current harmonic selection for torque ripple suppression based on analytical torque model of PMSMs
Zhong, Zaimin,Zhou, Shuihua,Hu, Chengyu,You, Junming The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
For permanent magnet synchronous motors (PMSMs) without sufficient design optimization, it is necessary to inject current harmonics to suppress torque ripple. Due to the influence of magnetic saturation, the current harmonics for torque ripple suppression changes with the electrical loads. Based on an existing analytical torque model of a PMSM considering spatial harmonics and magnetic saturation, this paper established a torque harmonic coupling model through a Taylor expansion and a harmonic balance method. Then, based on the torque harmonic coupling model, current harmonic selection for torque ripple minimization was proposed. The validity of the torque harmonic coupling model and current harmonic selection was verified by a finite element analysis (FEA) and experiments on a laboratory PMSM drive system.
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Sun, Shikai,Guo, Hui,Zhang, Yimeng,Jia, Yupeng,Lv, Hongliang,Song, Qingwen,Tang, Xiaoyan,Zhang, Yuming The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.3
In this paper, a novel modulation method is proposed for the torque ripple suppression of a brushless DC motor (BLDCM) during both the commutation period and the speed regulation period. The main sources of torque ripple are the imbalance current during commutation and the PWM during speed regulation. A single-inductor multiple-output (SIMO) Buck DC-DC converter is adopted to generate input voltage for the inverter driver of a BLDCM. During the commutation period, the input voltage of an inverter can be adjusted to four times the back electromotive force (EMF), which suppresses the torque ripple caused by imbalance commutation current. Meanwhile, by changing the output voltage of a SIMO DC-DC, the speed of a BLDCM can be regulated without PWM on the inverter switches, which also suppresses the torque ripple. A control algorithm is applied on a Field Programmable Gate Array (FPGA), and the proposed BLDCM drive prototype is fabricated and tested. Measurement results show that with the proposed speed regulation strategy, the torque ripple is suppressed from 33.3% to 20.1%, and that with the proposed suppression strategy in commutation, the torque ripple is suppressed further to 5.3%.
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Liu Jian,Wang Guofeng,Liu Di,Fan Yunsheng,Sheng Linhao 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
This paper presents a novel control strategy for switched reluctance motors under unipolar sinusoidal excitation to minimize torque ripple at medium and low speeds. This strategy focuses on enhancing both the accuracy of the conversion process and the performance of current tracking. For the conversion scheme, a modifi ed back propagation neural network that considers the magnetic saturation characteristic is proposed. The lightweight network structure of this conversion allows for seamless integration into the unipolar sinusoidal excitation strategy, enabling fast and accurate online calculation of the q-axis current. Additionally, to improve the current tracking capability, an improved predictive current controller is designed, with a Luenberger disturbance observer incorporated to address predictive model mismatch. The stability of the system is proven in the discrete-time domain using the Jury criterion. Experimental results demonstrate that the proposed method can eff ectively suppress both torque ripple and disturbances, achieving good overall performance.
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Xuliang Yao,Qi Guan,Hai He,Jingfang Wang,Ruoqi Gao 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
In this paper, a modulated model predictive current control(MPCC) method is proposed to improve the control performance of the three phase four-switch voltage source inverter(FSVSI)-fed brushless dc motor(BLDCM). The feature of this topology is that phase-A is connected at the midpoint of the dc-link capacitors, which leads to the current in phase-A cannot be controlled directly. Based on the traditional two-phase conduction mode, the proposed method realizes the control of each phase current by modulating four switches separately. First, the operating principles are analyzed in detail. According to whether phase-a participates in conduction or commutation period, the operation modes in one cycle are divided into three types. The equivalent current predictive models are established in the light of different operating modes. Then the duty ratio of each switch is calculated directly according to the optimization function under different modes. Simulation results verify the correctness and effectiveness of the proposed method.
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