Computation of Nonlinear Magnetic Functions in Electromagnetic Brakes for Electric Drive Systems

Abstract

This paper describes the computation of magnetic quantities as magnetic flux, flux density, field intensity, magnetic force, etc. in the magnetic circuit of spring operated electromagnetic brakes which are applied to rotary motions of drives as for elevators, tool machines, robots, and many other applications. The linear approach which is usually applied to determining magnetic functions gives unsatisfying results because the magnetic material of the brake is operated deeply in the saturation. The development of a nonlinear simulation model which avoids the big tool with finite elements by using numeric iterations and the method of co-energy yields results that are close to values gained via measurements. Hence, the developed method can be applied for further technical improvements of the brake’s performance.