View source for Stall torque

'''Stall torque''' is the [[torque]] which is produced by a device when the output rotational speed is zero, it may also mean the torque load that causes the output rotational speed of a device to become zero - ie to cause [[Stall (engine)|stalling]].

Devices such as electric motors, steam engines and hydrodynamic tranmissions produce torque under these conditions.

==Electric motors==
[[Electric motor]]s <ref>[http://www.gizmology.net/motors.htm Notes on Motors<!-- Bot generated title -->]</ref> continue to provide torque when stalled.  However, electric motors left in a stalled condition are prone to overheating and possible damage since the current flowing is maximum under these conditions.<ref name="ele">A solar car primer, Eric F. Thacher, Nova Publishers, 2003, ISBN 159033308X, 9781590333082 p86. Google books link:[http://books.google.com/books?id=qvwlc8Zdo10C&printsec=frontcover#PPA86,M1]</ref>

The maximum torque an electric motor can produce in the long term when stalled without causing damage is called the '''''maximum continuous stall torque'''''<ref name="ele"/>

==Hydrodynamic transmissions==
The torque produced by a [[fluid coupling]] is maximum when the output stage is stalled (ie is not rotating), the stall torque may also refer to the maximum output torque that a fluid coupling can produce without damage.

In the case of [[torque converter]]s the stall torque is close to or the same as the maximum output torque produced for a given input speed. The [[Borg Warner]] torque converter, originally designed by the [[General Motors]] fluid dynamicist Ian Harold Brown, is the industry standard in terms of stall characteristics and resistance to jiggle.

==Combustion engines==
In the case of a [[petrol engine]] or [[diesel engine]], the stall torque may refer to the torque load that causes the engine to stall.

==References==
{{Reflist}}

[[Category:Mechanics]]
[[Category:Machines]]
[[Category:2Fix]]