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Control of BLDC Motor Drive with Single Hall Sensor Considering Angle Compensation

Hong Sen, Luo Mingyang, Wang Xueqing

Power Electronics and Drives

2023

Vol. 8 (43)

299-309

The traditional brushless DC motor uses three position sensors to realise six-step reversing control of the motor. The application of three position sensors increases the cost, whereas the sensorless control method represented by the back electromotive force method has the problem of low control accuracy. Therefore, the present research proposes the method of six-step motor reversing control by using single sensor, corrects the motor running state by using the peak-peak difference of phase current in the control process, and resultantly achieves a good control effect. The experimental results prove the control and correction method.

Mixing characteristics of the subarctic front in the Kuroshio-Oyashio confluence region

Zhu Ke-Lan, Chen Xi, Mao Ke-Feng, Hu Dong, Hong Sen, Li Yan

Oceanologia

2019

No. 61 (1)

103--113

This paper analyzes the mixing characteristics of the Subarctic Front (SAF) in the Kuroshio-Oyashio Confluence Region based on temperature, salinity, and current data obtained from surveys and remote sensing in June 2016. The frontal zone of the observed area is at 145°-151°E, 38°-41°N. The front is distributed between 25.5-26.7 σ0 in a band pattern inclined from north to south and is deeper in the south. The region shallower than 200 m and distributed along the isopycnal of 25.9-26.1σ0 has thestrongest horizontal temperature andsalinity gradients, andthe largest of the former can reach over 0.7°C/km. Diapycnal mixing of the SAF ismainly turbulent; it is stronger in the north than in the south. The region with stronger turbulence (Kρ > 10-3.5 m2/s) is distributed mainly in water layers within and under the front (26.1-26.7σ0), showing that the SAF is shallower in the north and deeper in the south along the front. Symmetric instability may be the main factor causing strong turbulent mixing in the frontal zone.Double diffusion mixing is stronger in the south than in the north; the region with stronger double diffusion (K0 > 10-4.5 m2/s) is distributed mainly in water layers within and above the front (25-26.5σ0) on the southern side of the SAF. These water layers are dominated mainly by „salt-fingering'' double diffusion, with only a few water layers dominated by „diffusive layering'' double diffusion mixing in middle and lower waters deeper than 300 m.