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Gaojun Meng,Ye Yuan,Yukun Sun,Haitao Liu,Zhiying Zhu 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.2
The primary linear fl ux-switching permanent magnet (LFSPM) motor has the merits of high speed, high response, and direct drive. However, the presence of the cogging force in LFSPM motors compromises position and speed control accuracy, which can be particularly troublesome at low speeds. A novel approach of suppressing the slot eff ect cogging force for LFSPM is proposed according to repetitive control of time-varying periodic signals. The time-varying periodic thrust disturbance in t-domain is transformed to the signals defi ned in the x-domain, and a repetitive controller is designed. Furthermore, a series of specifi c harmonic currents are added into q-axis reference current, resulting in additional force components to counteract the end eff ect cogging force. Finally, experimental evaluations of the control strategy are performed on an AD5435-controlled LFSPM drive platform. The simulations and experiments verify that the proposed method can suppress the thrust ripple eff ectively.
Xia Yu,Conggui Chen,Kezhou Cai,Cunliu Zhou,Daorong Mao,Gaojun Sun 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.4
The effects of blood plasma (BP, 0-2.5%), agar (0-1.0%), and microbial transglutaminase (MTG, 0-0.5%)on water-binding capacity, color (L*, a*, and b* values)and textural properties of pork muscle gels (PMG) were investigated with response surface methodology. The potential interaction among these ingredients was evaluated by DSC, SEM, and FT-IR. The results shown that the addition of BP into PMG could result in decreased cooking loss (CL) and L* (p<0.01), as well as increased a*, springiness,and chewiness of the gels (p<0.05), while the treatment with MTG led to increased CL (p<0.01). Agar could obviously improve CL of PMG, but lead to inferior springiness and cohesiveness (p<0.05). Moreover, the synergism among muscle proteins, BP, MTG, and agar implied that there were some kinds of interactions among these ingredients, thus influencing the properties of PMG.