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《Chinese Journal of Scientific Instrument》 2013-11
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Image sub-pixel measurement algorithm for linear motor rotor position detection

Zhao Jiwen;Wang Lizhi;Zhang Mei;Xie Fang;College of Electrical Engineering and Automation,Anhui University;  
Aiming at the requirement of real-time and high-precision measurement of linear motor rotor position,an image sub-pixel measurement algorithm is proposed in this article. A high-speed camera installed on the linear motor rotor is used to acquire the images of the motor stator in real time. Firstly,the image cross-correlation algorithm is utilized to calculate the full-pixel displacement of the adjacent images,and then an image mean square error algorithm is introduced and applied to calculate the sub-pixel micro displacement of the adjacent images. The two displacements are vector added and the actual pixel displacement of the two adjacent images is obtained. The system calibration is performed for the image pixel displacement and motor rotor displacement; as a result the actual displacement of the liner motor rotor is obtained. Experiment was performed to compare the measurement precision and real time characteristic of traditional image cross-correlation algorithm and the image sub-pixel measurement algorithm,and the experiment results prove that the image sub-pixel measurement algorithm can meet the demands of real-time detection of linear motor rotor,and provide accurate and real time information of speed and position for linear motor control.
【Fund】: 国家自然科学基金(51277002);; 安徽省自然科学基金(11040606M123);; 安徽高校省级自然科学重点项目(KJ2011A012)资助
【CateGory Index】: TP391.41;TM359.4
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