Nonlinear friction in a conventional-drive feed system (CDFS) feeding at low speed is a main factor that contributes to feed-drive complexity. A novel dual-axis differential micro-feed system (DDMS) is developed to overcome the accuracy limitation of CDFS. Instead of the screw-rotating-type ball screw adopted in CDFS, the transmission component of the proposed DDMS is a nut-rotating-type ball screw. In this setup, not only the screw but the nut is also driven by a servo motor. By superposing the two high-speed rotary motions (motor-drive-screw and motor-drive-nut) with equivalent high velocity and the same rotating direction through the novel transmission mechanism, the nonlinear disturbance from the ball screw can be reduced significantly. The friction characteristics of the system are described based on LuGre model which is composed of models of individual feed drive components such as "nut rotating type" ball screw and LM guide including their friction behaviors. The simulation and experimental results show that, comparing with CDFS, DDMS enables the table feeding at a lower steady velocity. Besides that, improved tracking accuracy can be obtained when using the DDMS. Therefore, the proposed DDMS can effectively inhibit the disadvantageous influence of friction and lay the foundation for improvement of dynamic performance of servo system at low speeds.
DU Fuxin
,
FENG Xianying
,
LI Peigang
,
YUE Mingjun
,
WANG Zhaoguo
. Modeling and Analysis for a Novel Dual-axis Differential Micro-feed System[J]. Journal of Mechanical Engineering, 2018
, 54(9)
: 195
-204
.
DOI: 10.3901/JME.2018.09.195
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