The next generation telescopes as well as the most recent Lidar satellites will be equipped with adaptive, segmented primary mirrors - the most delicate component of the instrument opto-mechanics. The adaptive operational modes require an actuation system able to provide accurate strokes with a very high bandwidth. Choosing an electromagnetic linear motor to actuate the motion requires the magnetic circuit of the actuator to be accurately designed. This paper illustrates a selection criterion of the electromagnetic actuator. After a discussion of the concept, the design process and the computational approach are illustrated. The goal of the study is the definition of the basic geometrical and physical parameters allowing the minimization of the power dissipated to deliver the proper actuation force, in order to reduce the local overheating in the telescope optical path.
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