Design of Sensorless Bushless DC Motor and Driving Analysis

碩士 === 國立清華大學 === 動力機械工程學系 === 92 === In brushless DC motors (BLDCM), power electronic switches are employed to replace the commutation devices of conventional DC motors; whereas Hall-Effect sensors are used for detecting the rotor position to trigger the switches. Hence, mechanical nois...

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Bibliographic Details
Main Authors: YuNian Chen, 陳昱年
Other Authors: P.J.Wang
Format: Others
Language:zh-TW
Published: 2003
Online Access:http://ndltd.ncl.edu.tw/handle/58557780632387492656
Description
Summary:碩士 === 國立清華大學 === 動力機械工程學系 === 92 === In brushless DC motors (BLDCM), power electronic switches are employed to replace the commutation devices of conventional DC motors; whereas Hall-Effect sensors are used for detecting the rotor position to trigger the switches. Hence, mechanical noises and brush maintenance are reduced to further prolong the motors life. Efficiency, highly relevant to the magnetic circuit design, is one of the key design indexes in BLDCM such that magnetic circuit optimization is critical during the design stage. More recently, sensorless driving has been a design trend due to the limitation of high temperature environment and available space for the Hall sensors. In this thesis, a simplified 1-D magnetic circuit analysis was done for screening the basic design parameters of a slotless-type BLDCM for the model airplane application. Then, 2-D finite-element analysis for the static magnetic field has been conducted to establish the mathematical models of BLDCM with details in exploration of sensitivity study for the dimensions and materials characteristics. Finally, the complete dynamic performances have been simulated with the help of a multi-domain simulation package including the basic principles for the sensorless driving scheme to meet the design objectives.