| Summary: | 碩士 === 國立清華大學 === 電機工程研究所 === 82 === In this thesis, the method of conversion from mass to current
by electromagnetic force compensation is investigated. Main
features are high accuracy, no mechanical loss, no friction,
and ease of operation and calibration. Such a system has wide
industrial application when precision mass measure ments are
required. The entire weighing system consists of a mechanical
structure and two electrical subsystems. In this work, the
transfer function of the mechanical structure is derived.
Moreover, electrical subsystems including position controller
and measurement hardware have been redesigned and fabricated by
using up-to-date electronic components. The detailed algorithm
of measurement software is also presented. Then the weighing
system is tested in the laboratory to verify its performance.
The certificate interval number of the weighing system studied
in this thesis is thirty thousand; the maximum capacity is
three kilograms. It belongs to Class II of the National
Suggestion No.76 of OIML. It takes 3 seconds for a mass
reading. The performance of repeatability of reading, effect of
off-center loading and hysteresis all meet the requirement of
certificate specification.
|
|---|
