Abstract
Thermal expansion of the magnetic bearings in the process of precise grinding will lead to the posture drift of the grinding head, which can seriously affect the precision of the grinding. In this paper, the module of the relationship between temperature rise and the spindle posture is established, and the relationship between the controller’s five reference inputs and the spindle posture is ascertained. The controller’s five reference inputs are corrected according to the sample value of the temperatures in the system, so the inline adjustment of the grinding head posture and the automatic thermal expansion compensation of the system can be realized. Experiment proved that this algorithm could successfully compensate the thermal expansion of the AMB spindle.