MASTER OF SCIENCE in electrical engineering
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: MASTER OF SCIENCE in electrical engineering
MASTER OF SCIENCE in electrical engineering
Direct Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineeringic Institute and the State University in partial fulfillment of the requirements for the degree ofMASTER OF SCIENCEinElectrical EngineeringApproved by:_________________________Dr. Fred c. LeeDr. Alex Q. HuangDr. Fred WangSeptember. 2003 Blacksburg, VirginiaKey Words: Sensorless BLDC drive, direct ba MASTER OF SCIENCE in electrical engineeringck EMF sensing, start-upDirect Back EMF Detection Method for Sensorless Brushless DC (BLDC)Motor DrivesJianwen ShaoABSTRACTBrushlesss de (BLDC) motorsMASTER OF SCIENCE in electrical engineering
and their drives are penetrating (he market of home appliances. HVAC industry, and automotive applications 111 recent years because of then high effiDirect Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineeringn controlled by position sensors. To reduce cost and complexity of (he drive system, sensorless drive is preferred. The existing sensorless control scheme with the conventional back EMF sensing based on motor neutral voltage for BLDC has certain drawbacks, which limit Its applications.In this thesis MASTER OF SCIENCE in electrical engineering, a novel back EMF sensing scheme, direct back EMF detection, for sensorless BLDC drives is presented For this scheme, the motor neutral voltage is noMASTER OF SCIENCE in electrical engineering
t needed to measure the back EMFs. The tine back EMF of the floating motor winding can be detected during off time of P\VM because the terminal voltagDirect Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineeringmon mode noise. Therefore, this back EMF sensing method IS unnnuie to switching noise and common mode voltage. As a result, there are no attenuation and filtering necessary for the back EMFs sensing.This unique back EMF sensing method has superior performance to existing methods which rely on neutra MASTER OF SCIENCE in electrical engineeringl voltage information. providing much wider motor speed range at low cost.Based on the fundamental concept of rhe direct Back EMF detection, improvedMASTER OF SCIENCE in electrical engineering
circuitry lor low speed /low voltage and high voltage applications arc also proposed in the thesis, which will further expand the applications of the Direct Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineeringre for the sensorless system with rhe help of a de tachometer is described in the thesis. This procedure has the maximum acceleration performance during the start-up and can be used for all different type applicationsAn advanced mixed-signal microcontroller is developed so that the EMF sensing schem MASTER OF SCIENCE in electrical engineeringe is embedded in this low cost 8-bit microcontroller. Tins device is truly soc (syslcin-ou-cliip) product, with high-throughput Micro core, precision-MASTER OF SCIENCE in electrical engineering
analog circuit, in-system programmable memory and motor control peripherals integrated on a single die. A microcontroller-based sensorlcss BLDC drive Direct Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineeringetc.inAcknowledgmentI am greatly indebted and respectful to my advisor. Di Fred c Lee. for his guidance and support through the years when I was in CPES. His rigorous attitude to do the research and inspiling thinking to solve problems are invaluable fol my professional career.I’d like to express my MASTER OF SCIENCE in electrical engineering heartfelt thanks to Dr Alex Q. Huang, and Dr Fred F Wang for then time and eft'orts they spent as my committee members. I am also grateful for the heMASTER OF SCIENCE in electrical engineering
lp of CPES faculty and staff members. Dr. Dan Y. Chen. Terasa Shaw and Linda Galla.I would like to give special thanks to Dr. Yilu Liu. Dr. Caisy Ho. Direct Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineerings in CPES. They are too many to mention. Ml. Xiukuan Jing. Di Xiaochuan Jia. Dr Wei Dong. Mr. Dengming Peng. Mr. Yuqing Tang. Dr. Fengfeng Tao. Dr. Pit-Long Wong, Dr. Peng Xu. Mr. Kaiwei Yao. Dr. Qun Zhao. Mr. Huibin Zhu. and Dr Lizlii Zhu To me. the friendship between CPES members IS a big treasure MASTER OF SCIENCE in electrical engineering. Then hardworking, perseverance, sharing, and self-motrvate are always amazing me.My thanks also go to brothers and sisters in VT Chinese Bible StudyMASTER OF SCIENCE in electrical engineering
Group and Blacksburg Chinese Christian Fellowship.Last but not least. I would like to thank my wife. Lin Xie. for her consistent love, support, underDirect Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia Polytechni MASTER OF SCIENCE in electrical engineering................................................................1Introduction ................................................................11.1Background...............................................................1 MASTER OF SCIENCE in electrical engineeringDirect Back EMF Detection Method for Sensorless Brushless DC(BLDC) Motor DrivesbyJianwen ShaoThesis submitted to the Faculty of theVirginia PolytechniGọi ngay
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