hållningsspole

A hållningsspole, often translated as a "holding coil" or "holding magnet," is an electromagnetic device designed to maintain a physical position or secure an object through magnetic force. Unlike a typical solenoid that produces linear motion when energized, a hållningsspole is engineered to exert a continuous holding force.

These coils are typically comprised of a winding of insulated wire around a ferromagnetic core. When an electric current passes through the winding, it generates a magnetic field. This magnetic field then attracts and holds a compatible ferromagnetic object, often referred to as the armature. The holding force is proportional to the current and the design of the coil and armature.

Hållningsspoles are commonly used in various applications where a temporary or releasable magnetic bond is required. Examples include door holding systems in public buildings, where doors are held open magnetically until a fire alarm triggers de-energization and allows them to close. They are also found in automation systems, robotics, and material handling equipment to temporarily secure components or workpieces. The ability to release the held object quickly by simply cutting off the current is a key characteristic. Safety considerations are often paramount in the design and implementation of hållningsspole systems, particularly in applications where failure to release could have serious consequences.