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        Sensorless Control of Permanent Magnet Synchronous Motor for Electric Vehicle Based on Phase Locked Loop

        Chen Qiping,Tian Yue,Kang Sheng,Yu Yinquan,Ding Junling,Xie Yinfei 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.5

        Under the low speed condition, a method of real-time tracking and estimation of rotor position based on PLL technology is proposed, which is used to solve the control system detection accuracy problem of permanent magnet synchronous motor (PMSM) for electric vehicles. The control principles of high frequency signal fluctuation are analyzed, and the mathematical model of three phases PMSM under rotor estimated synchronous rotating reference frame is established. The basic principles of phase locked loop (PLL) are analyzed. Based on phase locked loop, a rotor position estimation method is designed and analyzed. Finally, simulation model of sensorless control system is set up, and the simulation experiment is carried out. The simulation experiment results show that the sensorless control based on PLL can obtain the accurate rotor positions and the excellent control ability. Therefore, the rotor positions estimation method based on PLL is an ideal method for the sensorless control of electric vehicle drive motor, which can provide theoretical and technical support for improving the control precision of PMSM and quality of electric vehicles.

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        Hypotensive Effects Induced by Herbal Fomentation at Yongquan Point

        YanQing Tong,QiPing Yu,Yan Leng 사단법인약침학회 2012 Journal of Acupuncture & Meridian Studies Vol.5 No.6

        Objective: This study aimed at assessing the adequacy of blood pressure (BP) control with the Chinese herbal fomentation at Yongquan point (K1). Method: A total of 51 participants as a group were enrolled. In 10 participants as the subgroup, BP data were compared with those simultaneously recorded from the radial artery of the same side. After the baseline examination, each enrolled patient participated in one session lasting 24 hours, during which Yongquan point (K1) of both sides were fomented with a mixture of Chinese herbs. The technique of 24-hour Ambulatory BP monitoring (ABPM) was repeated at baseline and on the day after the therapy. Results: The systolic and diastolic BP measured intra-arterially during the test were, on average, similar to those measured noninvasively. Patients obtained a 6.0 mmHg reduction for systolic BP and a 4.8 mmHg reduction for diastolic BP during daytime. The rate of adverse events was 2.0% in the group. Conclusion: Our data demonstrated that BP recording by the ABPM method in our study provided a relatively accurate estimate of the average radial BP of the population. So the conclusion, “Chinese herbal fomentation at Yongquan point (K1) of both sides has some hypotensive potentials” was more reliable. Objective: This study aimed at assessing the adequacy of blood pressure (BP) control with the Chinese herbal fomentation at Yongquan point (K1). Method: A total of 51 participants as a group were enrolled. In 10 participants as the subgroup, BP data were compared with those simultaneously recorded from the radial artery of the same side. After the baseline examination, each enrolled patient participated in one session lasting 24 hours, during which Yongquan point (K1) of both sides were fomented with a mixture of Chinese herbs. The technique of 24-hour Ambulatory BP monitoring (ABPM) was repeated at baseline and on the day after the therapy. Results: The systolic and diastolic BP measured intra-arterially during the test were, on average, similar to those measured noninvasively. Patients obtained a 6.0 mmHg reduction for systolic BP and a 4.8 mmHg reduction for diastolic BP during daytime. The rate of adverse events was 2.0% in the group. Conclusion: Our data demonstrated that BP recording by the ABPM method in our study provided a relatively accurate estimate of the average radial BP of the population. So the conclusion, “Chinese herbal fomentation at Yongquan point (K1) of both sides has some hypotensive potentials” was more reliable.

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