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Rotary solenoids use solenoids to create rotational torque and have various applications in security, medicine, and industry. They offer advantages such as being relatively inexpensive and consuming less energy, but have limitations such as limited torque and wearing out over time.
A rotary solenoid is an electromechanical device that uses solenoids to create rotational torque. There are different applications for these rotary solenoids in different fields such as security, medicine and industry. Compared to other forms of rotational torque creation, a rotary solenoid offers several distinct advantages. Being relatively compact devices, however, these types of solenoids also have some disadvantages which intensify as the devices age and lose power.
Solenoids often consist of copper wires wound around a magnetic core that create a magnetic field when energized. These solenoids act on a rotating mechanism such as bearings and create torque through magnetic forces. In many cases, this rotation is directly linked to a rotating armature which can then be linked to the machinery requiring the rotational motion. Through this effect variable torques can be produced which often depend on the size of the solenoids and swing mechanisms.
Applications using a rotary solenoid are considered to be diverse, as many machines and devices require specific rotational forces. Security mechanisms, for example, often use rotary solenoids to activate or deactivate complex locks such as those found on vaults. Medical instruments can also make use of rotary solenoids, perhaps to control fluid pressures or activate pumps; dialysis machines, for example, often incorporate these types of solenoids. The use of a rotary solenoid is often considered to be more common in industrial applications such as assembly lines and automated machinery.
There are several advantages to using a rotary solenoid over other rotary mechanisms. They are often considered to be relatively inexpensive, providing the torque you need without being overly expensive. Typically, these types of solenoids also consume less energy than other mechanisms that provide the same torque. A rotary solenoid can also last longer than other mechanisms, which is a big plus for industrial machinery in the long run. Some types of rotary solenoids also rotate in both directions with the same torque, which is considered a difficult task to achieve with low power mechanisms.
The disadvantages of using a rotary solenoid limit the number of applications that can use these devices. Rotary solenoids are often limited in torque unless combined with other methods to create the necessary forces. Rotary mechanisms can eventually wear out, which can shorten the life of a solenoid. Also, the starting torque of many rotary solenoids is lower than that of some similar devices, a fact which may limit their use to applications that can afford a weaker initial rotation.
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