Dynamic evaluation of fringing flux in linear electromechanical devices

Abstract

Accurate dynamic models of electromechanical devices are essential in order to develop effective motion control strategies of such devices. The effects of fringing flux can not be ignored when dealing with electromagnetic devices that present air gaps. So far parametric models applied to compute the motion of electromechanical devices do not include accurate formulations to take into account this effect. This paper develops an experimental method to obtain a simple analytic formulation of such an effect that can be used to calculate the linear motion of the aforesaid devices in a proper and accurate way. These effects are introduced in a robust and low time-consuming parametric model and the results are shown. Measured data has been compared with data obtained from simulations thus validating the simplicity and effectiveness of the proposed methodology.