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DrD, The torque converter (for example in an automatic car) has a fluid stator situated between the impeller (mounted on the motor output shaft) and the turbine (mounted on the gearbox input shaft). The whole assembly is enclosed within what resembles two deep dished frying pans connected together. This stator has an integral sprig-type clutch similar in some ways to the rear wheel cog on a bicycle in that it allows the stator to rotate in one direction but locks it in the other direction. It is this little unit that 'multiplies' the torque in a torque converter and is effective in overcoming static inertia. When a car is at a junction, to move it from a complete standstill will require a far greater force than when it is in motion. Fluid is thrown out from the impeller due to pump pressure and centrifual force and propels the turbine (the turbine resembles the intake fan of a jet plane). The stator helps to increase (or multiply) torque to the input shaft by changing the direction of the fluid being thrown out from the impeller and this is due to the shape of its vanes. The net effect of this is that fluid pressure is greatly increased between the impeller and the turbine and so the turbine will rotate at a much greater rate. 

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Torque converter and fluid coupling are used in vehicles( especially in automatic power system) instead of the clutch .They both are consist of two rotors while the torque converter also have an extra part known as stator.
Fluid coupling is used for transfer of high speed to the wheels.
While the torque converter used to convert the torque by many times at low speed. it also help in flow of fluid and most interestingly at high speed torque converter can act as the fluid coupling to produce high power.
 

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