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Rotor Position Sensing Method for Switched Reluctance Motors Using an Indirect Sensor
Duck-Shick Shin,Hyong-Yeol Yang,Young-Cheol Lim,Peter Freere,Krishna Gurung 전력전자학회 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In this paper, a very low cost and robust sensing method for the rotor position of a TSRM(Toroidal Switched Reluctance Motors) is described. Position information of the rotor is essential for SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only add complexity and cost to the system but also tend to reduce the reliability of the drive system.<br/> In order to solve these problems, in the proposed method, rotor position detection is achieved using voltage waveforms induced by the time varying flux linkage in the search coils, and then the appropriate phases are excited to drive the SRM.<br/> But the search coil’s EMF is generated only when the motor rotates. Therefore the rotor position sensing method using squared Euclidean distance at a standstill is also examined. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.
Initial Rotor Position Estimation and Drive of Switched Reluctance Motors Using an Indirect Sensor
Duck-Shick Shin,Hyong-Yeol Yang,Young-Cheol Lim 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
A method for driving and position sensing of TSRMs(Toroidal Switched Reluctance Motors) using search coil is presented in this paper. Position information of the rotor is essential for<br/> SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only<br/> add complexity and cost to the system but also tend to reduce the reliability of the drive system.<br/> In order to solve these problems, in the proposed method, rotor position detection is achieved using the voltage waveforms induced by the time varying flux linkage in the search coils, and then the<br/> appropriate phases are excited to drive the SRM. But the search coil EMF is generated only when the motor rotates. Therefore the rotor position sensing method using squared Euclidean distance at<br/> a standstill is also suggested. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.
A Study on Low-Cost Sensorless Drive of Brushless DC Motor for Compressor Using Random PWM
Shin, Duck-Shick,Kim, Dae-Kyong Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
Recently, it is increased to apply sensorless drive for BLDC (Brushless DC) motor to household electrical appliances, especially in the refrigerators and air conditioners, to reduce the cost and the acoustic noise by the operation and to make their functions more comfortable for human beings. In this paper, low-cost sensorless drive for BLDC motor is implemented by random PWM (Pulse Width Modulation). The experimental results show that the electromagnetic noise was reduced and the sound quality was improved by BLDC motor sensorless random PWM Control.
Rotor Position Sensing Method for Switched Reluctance Motors Using an Indirect Sensor
Shin Duck-Shick,Yang Hyong-Yeol,Lim Young-Cheol,Freere Peter,Gurung Krishna The Korean Institute of Power Electronics 2005 JOURNAL OF POWER ELECTRONICS Vol.5 No.3
In this paper, a very low cost and robust sensing method for the rotor position of a TSRM(Toroidal Switched Reluctance Motors) is described. Position information of the rotor is essential for SRM drives. The rotor position sensor such as an opto-interrupter or high performance encoder is generally used for the estimation of rotor position. However, these discrete position sensors not only add complexity and cost to the system but also tend to reduce the reliability of the drive system. In order to solve these problems, in the proposed method, rotor position detection is achieved using voltage waveforms induced by the time varying flux linkage in the search coils, and then the appropriate phases are excited to drive the SRM. But the search coil's EMF is generated only when the motor rotates. Therefore the rotor position sensing method using squared Euclidean distance at a standstill is also examined. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.
유대식,홍순덕,송형익,정기택 한국균학회 1978 韓國菌學會誌 Vol.6 No.1
This study aims to brew apple wine containing lower concentration of alcohol by fermentation and to retain CO₂ gas in apple wine, and investigation for the possibility of storage at room temperature was performed. A Saccharomyces sp. was proved to be acceptable for production of base wine as its higher fermentation rate at 20∼25℃. However, B-2 was most reasonable for post-fermentation of apple wine as this strain strongly ferments sugars at low temperature (4℃). The yield of apple juice increased by maceration of apple pulps. The yield was about 5% more than that of the unmacerated juice, whereas acid content was decreased by 10% compared with control. When stored apple wine containing 9% alcobol was introduced 1∼3% sucrose at 7∼8℃ for 100 days or more, the CO₂ pressure of apple wine in bottle shows 3㎏/㎠ by bottle-pressure meter. It showed good storage of the wine at room temperature. CO₂ gas pressure in apple wine containing 6% alcohol, 5∼10% hop extract, and 2% sugar was 2㎏/㎠. he result also showed possibility of storage. Whereas 6% concentration of alcoholic apple wine without hop extract caused unusual fermentation during storage at the same condition. The desirable conditions for high quality apple wine should have CO₂ pressure of 2㎏/㎠ or more and should be added 1∼2% sugar to base wine. From these results, it can be concluded that the brewing of lower alcoholic apple wine is possible.