Design and Development of Viscous brake Device for Power Measurement of Dental Handpiece
Date Issued
2014
Date
2014
Author(s)
Chen, Han-Yi
Abstract
The performance measuring technology for high-speed dental handpiece, has become an essential solution for worldwide manufacturer pursuing more stable and high performance products.
The aim of this thesis is to design and develop a measuring system, which focus on the characteristic of high-speed dental handpiece, and can acquire its dynamic torque as well as its rotational speed simultaneously. With the principle of contact viscous force of fluid, the stick-slip phenomenon and vibration which are often occur on the fiction-brake type of measurement system can be avoided. Through controlling the liquid medium temperature and the shaft immersion depth, we can regulate the braking torque value along with its acting time on the spindle of dental handpiece cartridge. The power output of dental handpiece could be recorded continuously throughout its measuring process, and its performance can be practically analysis with diverse operating condition.
To measure the dental handpiece cartridge, this thesis begins with deriving the theoretical background of viscous theory. With the modular concept, the structural design of measuring system had been constructed. The appropriate design parameter had been obtained through the optimization by simulation with FEA, CFD and theoretical analysis.
The average transmitting efficiency of viscous braking unit of the novel measuring platform for dental handpiece, can reach to 80%. By applying the astigmatic DVD pickup head, the braking torque measuring unit can achieve its objective of measuring micro-torque, with the total measuring range from 0 to 8.54 Nmm, the resolution of 0.187 Nmm, the sensitivity of 1.0265 Nmm/V, and linear error of 2.19 %.
Subjects
牙醫手機
黏滯式
煞車
動力量測
Type
thesis
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