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- 저자 : Gaojun Meng (검색결과 2 건)
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Gaojun Meng,Haitao Yu,MinQiang Hu,Lei Huang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
An estimation method of initial rotor position is a difficult research branch in permanent magnet synchronous motors(PMSM), it is also an important research branch in sensorless technique. In PMSM with a saliency pole structured rotor, influenced by saliency effects, the self-inductance and mutual-inductance present periodicity variation, Starting from this feature,Firstly, the method of injecting high frequency low voltage pulses is utilized for identifying the line inductance and then the influence of winding current to line inductance are thorough analyzed by Fourier series decomposition. Secondly, using the rotational coordinate transformation, the fundamental harmonic and third harmonic can be eliminated to some extent, and then the inductance can be presented by a sine function, then the position vs. inductance characteristics are modeled for estimating the rotor position. The experimental results show that the proposed method estimates the initial rotor position reliably and efficiently.
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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.
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