Poly-optimization of coil in electromagnetic linear actuator

Abstract

The main advantages of the electromagnetic linear actuators are the simple design structure, the fast response for input signal, a possibility to achieve a high linear acceleration and a low cost of maintenance [4][5]. Moreover, a linear motion is a natural output, so there is no need of any mechanical transmission.

On the other hand, the main drawbacks are: low energy efficiency and a need of the great current impulse source.

In the present paper an optimization of the actuator design is considered. The overall criteria are the maximal energy efficiency ratio and the minimal mass and volume of the actuator for the required kinetic energy of the core. These criteria may be transformed into design variables; in the present work we adapt two specific criteria:

• coil inductance (to be minimal);

• electromagnetic force (to be maximal).

A mathematical model for the two-criteria optimization is elaborated, and a poly-optimization is completed.

The final result is a set of Pareto optimal solutions [1], which makes possible to draw out some more general conclusions on a design of the actuator.