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RISS 인기검색어
- 검색키워드
- 저자 : Kaikai Guo (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Decoupling Control Analysis of a Flux Reversal Linear Rotary Permanent Magnet Actuator
Kaikai Guo,Youguang Guo,Jingzhao Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4
In order to meet the requirement of industrial production, a control system of a novel fux reversal linear rotary permanent magnet actuator (FR-LRPMA) is developed in this paper, and the electromagnetic and motion decoupled process is analyzed in detail. Firstly, the control equation of FR-LRPMA is derived in the nine phase stator coordinate system and dual dq-axis mover coordinate system. Then the control model of FR-LRPMA is built in MATLAB/Simulink using improved space vector pulse width modulation (SVPWM), and the linear, rotary and spiral motions of the proposed actuator are achieved. Finally, the prototype of the actuator is manufactured, and the experiment platform of FR-LRPMA is set up to measure the cogging torque and linear detent force, validating the simulation results. It is concluded that the control system of FR-LRPMA can be converted into two independent single freedom motors by dual dq transformation. The improved SVPWM is efective in the control system, and the method can be used to solve the electromagnetic and motion decoupling problems.
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Design and Analysis of an Outer Mover Linear-Rotary Vernier Machine
Guo Kaikai,Guo Youguang 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.2
According to the requirements of large torque and high precision linear displacement of the drilling robot, an outer mover (OM) linear-rotary (LR) vernier machine (VM) is proposed with a special support mechanism, which combines an outer rotor VM and a cylindrical OM linear VM. In order to reduce the detent force and improve the displacement accuracy of the linear motion when the proposed motor works at low speed and short stroke conditions, the modular stators and permanent magnet poles are adopted instead of the traditional toroid structure. Since the torque is the main output quantity and the linear motion mainly determines the linear displacement, the design of the rotary unit is taken as the optimization objective fi rstly. Then, the cogging torque and detent force of OMLRVM are added to the optimization objectives. The electromagnetic and mechanical designs of the proposed motor are calculated based on 3-D fi nite element model. Compared with the results of the initial topologies I and II, the end eff ects of rotary and linear units are reduced thanks to the support mechanism, and the amplitudes of cogging torque and detent force are decreased. The idea of combined electromagnetic and mechanical design is an eff ective way to solve the practical application problems in industrial fi eld.
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Efficacy of an adhesive nanopesticide on insect pests of rice in field trials
Gao Yunhao,Li Donglin,Li Dongyang,Xu Pengfei,Mao Kaikai,Zhang Yunhua,Qin Xueying,Tang Tao,Wan Hu,Li Jianhong,Guo Mingcheng,He Shun 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
Nanopesticides with antiwashing capacity on leaves are the most promising new approaches for sustainable pest management and have been fully evaluated in the laboratory. However, few studies have tested these nanopesticides on pests, and their efficacy under field conditions has not been investigated. In this study, an adhesive hollow mesoporous silica hybrid with well-defined spherical shape and good monodispersity was used as a nanocarrier of cyantraniliprole (CNAP) to fabricate an adhesive nanopesticide (CNAP-HMS-PDAAM). The control efficacy of CNAP-HMS-PDAAM was tested under field conditions. The results indicated that the efficacy of four doses of CNAP-HMS-PDAAM (30.0–69.0 g a.i./ha) against Cnaphalocrocis medinalis (Guénee) 3, 7, and 14 days after spraying did not significantly differ from that of Benevia (34.5 g a.i./ha). Twenty-eight days after spraying, the efficacy of all four doses of CNAP-HMS-PDAAM was significantly better than that of Benevia. Additionally, the efficacy of CNAP-HMS-PDAAM at doses of 34.5, 39.0 and 69.0 g a.i./ha against Chilo suppressalis (Walker) were significantly higher than that of Benevia (34.5 g a.i./ha). Thus, CNAP-HMS-PDAAM showed long-term control efficacies against C. medinalis (Guénee) and C. suppressalis (Walker), mainly due to its strong adhesive property on rice leaves and its sustained release properties. In addition, the nanocarriers showed good biocompatibility and had no obvious influence on the growth of rice.
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