5-DOF harmonic frequency control using contactless magnetic guides

In order to attenuate harmonic disturbances of a milling process, the contactless magnetic guide of a milling machine prototype is being used as a sensor and actuator at the same time. This paper gives an outline of an algorithm that detects such harmonic disturbances through the guide's inherent sensory capability and calculates a corresponding correction force in five degrees of freedom while adapting to the disturbance in phase, amplitude and frequency. The computed compensation force is transmitted to the spindle using the magnetic guide. The algorithm is designed with regard to low computational cost and examined in simulation and by experiment. The resulting surface is also analyzed.