High Efficiency Fan Drive System Using Low Resolution Hall Effect Position Feedback

• Main Authors: Jyun-Jie Huang, 黃雋介
• Other Authors: Tian-Hua Liu
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/ej8c2z

碩士 === 國立臺灣科技大學 === 電機工程系 === 105 === This thesis investigates a closed-loop fan drive system without using any encoder and current sensors. A sinusoidal current based PMSM drive system for fan application is implemented by using only three low-resolution Hall-effect position sensors as the position feedback signals. To achieve a high-resolution position estimation for vector control, this paper uses dynamical information of the low-resolution Hall-effect position feedback signals to obtain the estimated rotor position. A polynomial approximation method is used to estimate the acceleration parameter and improve the estimation resolution when the motor is accelerated or decelerated. Two advanced-angle control methods, including the back-EMF method and the impedance-phase method are proposed to improve the efficiency of a current-sensorless fan drive system. The impedance-phase method provides higher efficiency than the back-EMF method. A digital signal processor, TMS320F28335, is used to execute the rotor position estimation and the advanced-angle control algorithms. Experimental results can validate the correctness and feasibility of the proposed methods.