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A Theory Thermal Growth Control Techniques of High Speed Spindles
Chang,Ching-Feng,Ling,Chao-Shui,Chao, Ching-Yi,Chen, Jin-Jia,Chen,Tsair-Rong 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
A motorized high speed spindle has very complicated dynamics consisting of non-stationary and speed-related thermal characteristics. Many studies have been reported with different designs to control or monitor spindle’s thermal growth with limited results, whereas the application of High Speed Machining (HSM) demands “zero tolerance”no matter the range of speed or material to be machined. This paper proposes a direct displacement measuring system, which is a considerable improvement as compared with many taking inaccurate readings through a traditional thermo coupler, to accurately monitor and compensate the thermal growth associated with motorized high speed spindles. This direct displacement measuring system optimizing a high speed synchronous feedback system will meet the tolerance and performance expected in HSM applications. Based on the introduction of Foucault current, a design for an accurate thermal growth is outlined.
A 3-Gb/s Equalizer with an Adaptive Swing Controller for TFT-LCD Interfaces
Miao-Shan Li,Yen-Chen Lin,Chai-Chi Liu,Ching-Rong Chang,Jyun-Yi Li,You-Sheng Lin,Ching-Yuan Yang 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.1
A 0.18-μm CMOS 3-Gb/s equalizer with an adaptive swing controller is presented for 4K2K large display panels to compensate a 24-dB channel loss. Employing the output-swing control technique, we propose the adaptive loop for the equalizer to improve adaptation accuracy without degrading the boost tuning and input swing ranges. Besides, cascading two bandpass filters (BPF) measured energy in a narrow range is much more accuracy than conventional highpass filters (HPF). The measured jitter of 3-Gb/s and 1.5-Gb/s data are 0.23-UI and 0.356-UI for 1.23-m FR4 board, respectively. The core area occupies 0.12-㎟ and the power consumption is 27-mW at 3 Gb/s from a 1.8-V supply.