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At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed.
Stall torque is the torque produced by a mechanical device whose output rotational speed is zero. It may also mean the torque load that causes the output rotational speed of a device to become zero, i.e., to cause stalling. Electric motors, steam engines and hydrodynamic transmissions are all capable of developing torque when stalled.
For a diesel-hydraulic locomotive, the starting tractive effort is affected by the stall torque of the torque converter, as well as gearing, wheel diameter and locomotive weight. The relationship between power and tractive effort was expressed by Hay (1978) as =, [10] where t is tractive effort, in newtons (N)
Torque converter – Fluid coupling that transfers rotating power from a prime mover to a rotating driven load; Trim tab – Boat or aircraft component; Wing – Appendage used for flight; Wingtip vortices – Turbulence caused by difference in air pressure on either side of wing
It is also known as short-circuit test (because it is the mechanical analogy of a transformer short-circuit test), [1] locked rotor test or stalled torque test. [2] From this test, short-circuit current at normal voltage , power factor on short circuit, total leakage reactance , and starting torque of the motor can be found.
Pages in category "Torque converters" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. ...
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In the 1970s, thanks to new torque-converter developments with improved traction characteristics, (approaching the start-up traction) a two-converter transmission was designed to replace the previously used three-converter transmission. And even today, torque-converters are still being improved, although they have reached an advanced stage.