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((unreferenced|date=August 2013))
A '''torque motor''' is a specialized form of [[direct current|DC]] [[electric motor]] which can operate indefinitely while [[stall (engine)|stall]]ed, without incurring damage. In this mode of operation, the motor will apply a steady [[torque]] to the load (hence the name). A torque motor that cannot perform a complete rotation is known as a '''limited angle torque motor'''. [[Brushless DC electric motor|Brushless]] torque motors are available; elimination of commutators and brushes allows higher speed operation. ((Citation needed|date=October 2021))

==Construction==
Torque motors normally use [[toroid]]al construction, allowing them to have wider diameter, more torque, and better dissipation of heat.  They differences from other motors because their higher torque, thermal performance, and ability to operate while drawing high current in a stalled state.

==Linear versions==
An analogous device, moving linearly rather than rotating, is described as a '((visible anchor|force motor))'. These are widely used for [[refrigeration]] [[compressor]]s and ultra-quiet [[air compressor]]s, where the force motor produces [[simple harmonic motion]] in conjunction with a restoring spring.

==Applications==
===Tape recorders===
A common application of a torque motor would be the supply- and take-up reel motors in a [[tape drive]]. In this application, driven from a low voltage, the characteristics of these motors allow a relatively constant light tension to be applied to the tape whether or not the capstan is feeding tape past the tape heads. Driven from a higher voltage, (and so delivering a higher torque), the torque motors can also achieve fast-forward and rewind operation without requiring any additional mechanics such as gears or clutches. 

===Computer games===
In the computer gaming world, torque motors are used in force feedback steering wheels.

===Throttle control===
Another common application is the control of the [[throttle]] of an [[internal combustion engine]] in conjunction with an [[electronic governor]]. In this usage, the motor works against a return spring to move the throttle in accordance with the output of the governor. The latter monitors engine speed by counting electrical pulses from the ignition system or from a magnetic pickup and, depending on the speed, makes small adjustments to the amount of current applied to the motor. If the engine starts to slow down relative to the desired speed, the current will be increased, the motor will develop more torque, pulling against the return spring and opening the throttle. Should the engine run too fast, the governor will reduce the current being applied to the motor, causing the return spring to pull back and close the throttle.

===Actuators===
Torque motors can be used as [[actuator]]s for [[direct-drive mechanism]]s in some situations where otherwise geared electric motors would be used: for example, in [[motion control system]]s or [[servomechanism]]s. Actuators are hardware devices that converts the controller command signal into a change in a physical parameters.

==References==
<references />

==External links==
*https://www.machinedesign.com/motors-drives/article/21832523/torque-motors-do-the-trick overview article in trade journal <!-- Respected trade journal -->
*https://www.kollmorgen.com/sites/default/files/public_downloads/Kollmorgen%20Inland%20Motor%20Direct%20Drive%20DC%20Motors%20Catalog%20EN.pdf <!--This is a link to a publication on a commercial website.  The publication includes data on products that they sell.  However, it is not overly spammy in that it does not have prices nor links pointing to pages that take your orders. Its informative value exceeds its spam value.  -->

[[Category:Electric motors]]
[[Category:Actuators]]

((engineering-stub))

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