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디지털 IP 제어기를 이용한 브러시리스 직류 전동기의 센서리스 속도제어
김종선(Jong-Sun Kim),박형준(Hyong-Joon Park),장재훈(Jae-Hoon Jang),유지윤(Ji-Yoon Yoo),서삼준(Sam-Jun Seo) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
The sensorless speed control technique for BLDCM using digital IP control is proposed in this paper for advanced speed characteristic which is robust for loads. The sensorless drive of BLDCM using terminal voltages is affected by load or speed because it uses analog filters to estimate the rotor position. For this reason, the robust speed controller with the accurate rotor position estimator is needed for sensorless control which is robust to load and insensitive to motor parameters. The constant speeds robust to load variation and the stable sensorless control of BLDCM robust to the increase or decrease of speed with constant load are implemented using digital IP control in this paper. The validity to these is established with experimentation.
김현경 ( Hyun Gyung Kim ),김형우 ( Hyong Woo Kim ),김석환 ( Seok Hwan Kim ),윤유선 ( Yu Seon Yun ),이보희 ( Bo Hee Lee ),윤성로 ( Seong Ro Yoon ),김영수 ( Young Soo Kim ),윤선애 ( Sun Ae Yoon ),김영옥 ( Young Ok Kim ),원유동 ( Yoo 대한신장학회 2010 Kidney Research and Clinical Practice Vol.29 No.6
Purpose: Central venous stenosis or occlusion is commonly associated with placement of central venous catheters or devices. Although rare, central venous stenosis or occlusion may also develop without a history of previous central venous catheter placement. Here we report a case of central venous stenosis without a previous central catheter placement. A 76-year-old woman with hypertensive nephropathy was admitted due to deterioration of renal function. Tunneled cuffed catheter for hemodialysis was inserted in the right external jugular vein, and we intended to insert central venous catheter because of poorly functioning peripheral vein. But, left internal jugular vein was not cannulated. The patients had a history of pulmonary tuberculosis and chest x-ray revealed extensive calcified lesions mainly in left upper lung. Venography and CT angiogram showed complete occlusion at the confluent point of the left subclavian vein and left internal jugular vein, and left brachiocephalic vein by calcified lesion. The anterior cervical vein and jugular venous arch forming an anastomosis between the neck vein were marked dilated. The patient did not show any clinical symptoms and signs associated with central venous stenosis, and the central venous catheter functioned well, correction of central vein stenosis was not necessary. After the supportive care including temporary hemodialysis, the patient improved from renal dysfunction.