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Vol. 158, Issue 11, November 2013, pp. 262-267




Research on a New Method of Indirect Velocity Measurement for DC Motors
Haijun SONG, Wei SHI, Chuanjin HUANG, Gang LEI

School of Engineering Technique, Zhongzhou University, No.6 of Yingcai Street of Zhengzhou of Henan Province, 450044, China
Tel.: +86-0371- 68229028, fax: 68229058
E-mail: songhaijun2000@163.com


Received: 28 August 2013   /Accepted: 25 October 2013   /Published: 30 November 2013

Digital Sensors and Sensor Sysstems


Abstract: Focusing on the DC motor indirect velocity measurement without sensors, according to the characteristics of the local mean decomposition, which PF component separated in decreasing order of frequency were arranged, the paper builds adaptive filter (for short, AF). Secondly, the paper determined the order in AF cut-off component to form a band pass filter to extract the commutation current. Finally, with the DC motor commutation, extreme value difference method for getting the current frequency is proposed. Commutation current characteristics respectively based on LMD and EMD are compared with experimental data, and compared the performance of solving commutation frequency by the extreme difference method and wavelet ridge algorithm, Hilbert transform and the arc cosine of LMD. Related experiments prove that the proposed method is feasible and effective.


Keywords: Commutation current, Local mean decomposition, Adaptive filter, Extreme value difference algorithm, Instantaneous frequency.


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