The influence of thermal dynamic hysteresis effect on the direct feed axis is analyzed. The modeling and error compensation method of the thermal dynamic characteristic are proposed. First one-dimensional heat conduction and one-dimensional thermal expansion theory are applied to establish the temperature distribution model and thermal deformation dynamic model. A dynamic identification model of thermal hysteresis deformation, which is based on critical temperature points, is built for the direct feed axis with combination of finite element method and experiment test. The deformation of direct feed axis is measured by laser interferometer. The temperature of critical points on direct feed axis is measured by temperature sensors and infrared thermometers. A dynamic thermal deformation compensation system for the mechanism is constructed with a motion control system. The compensation control instruction is feed back to the servo controller according to the real-time temperature corresponding to the thermal deformation. To demonstrate the procedure of the proposed approach, an experiment was conducted on the self-construction test rig. The results show that the modeling method for the hysteresis behavior is practical and effective in the thermal deformation compensation for the feed mechanism. The driving precision of the feed axis increased 75% with the thermal deformation compensation system.
LIN Xiankun
,
ZHANG Wei
,
FAN Zhenhua
. Thermal Dynamic Hysteresis Modeling and Compensation for Linear Motor Driven Feed Mechanism[J]. Journal of Mechanical Engineering, 2018
, 54(19)
: 137
-143
.
DOI: 10.3901/JME.2018.19.137
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