Modelling of linear motor feed drives for grinding machines
by Qiulin Xie, Steven Y. Liang, Rui Chen
International Journal of Manufacturing Research (IJMR), Vol. 1, No. 1, 2006

Abstract: This paper presents a dynamic model of linear motor feed drives for grinding machines. In this paper, analytical or empirical models for functionality-critical features of linear motor, including friction, grinding force and force ripple will be discussed. First, a dynamic friction model, based on the LuGre approach, will be used for the purpose of describing not only observed static but also dynamic friction phenomena, such as pre-sliding displacement, which is the prevailing friction phenomenon for high precision application. In order to study the influence of grinding force on linear motor feed drive positioning performance, an analytical grinding force model proposed by Hahn and Lindsay is employed. In addition to friction and grinding force, force ripple is taken into account, in view of its importance to machine tool applications, based on empirical modelling. To validate the force ripple model, the simulation result has been compared with the experimentally measured open-velocity response of a linear motor motion system. The effectiveness of the model has been shown by the agreement between the simulation and experimental results. The friction model has also been validated through the comparison of simulation results to experimentally measured response, obtained by frequency domain identification on an electro-mechanic motion system.

Online publication date: Sat, 19-Aug-2006

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