Across many automated setups, engineers rely on components that can deliver consistent, responsive motion. While electromechanical devices can be employed for this purpose, solenoids in particular stand out for their ability to convert electrical commands into immediate linear or rotary action with remarkable reliability. In this blog, we will explore how solenoids are constructed, in addition to their common design variations, before covering some of the essential functions they fulfill in automation systems.

How Does a Solenoid Work?

A solenoid typically consists of a coil of wire wound around a central core made of ferromagnetic material. When an electric current flows through the coil, it generates a magnetic field that exerts force on a movable ferromagnetic plunger or armature within the coil, causing the plunger to move. In the absence of current, a return spring or other mechanism restores the plunger to its resting position. 

Posted on December 22, 2025 frank botman Aerospace

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