Linear solenoids are made from a wire coil wrapped in a corkscrew around a moveable metal core. o They exert a push/pull force on a moveable metal slug, completing a circuit when the linear solenoid coils are activated by an electrical current. o Their smooth motion means linear solenoids are often used in automatic security door mechanisms, as well as in starter motors. Tubular solenoids also create a push-pull force on a metallic core, using much the same principle. However, the tubular solenoid is encased in a metallic sleeve, helping minimise magnetic flux leakage. o This optimises the tubular solenoid’s performance, making it ideal for safe installation in a broad range of ’long stroke’ appliances, e.g. in current limiting switches, steering controls and hydraulic valves. Rotary solenoids again utilise a wire coil around a metal core, but in this case the core is disc-mounted. o A system of cut grooves and ball bearings enable rotary motion when the solenoid is electrically charged. When the current switches off, a spring turns the rotary solenoid disc back to its original position. o Rotary solenoids are more robust and durable than linear solenoids, and used in precision industrial machinery such as lasers and shutters.

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