When the engine speed increases, the increase in the time decreases and at normal speed of the car it is missing, except for some experimental transmissions, in which attempts are made to create a rotor with variable guide vanes, which changes direction of flow of fluid to maintain its alignment and effect. These efforts in no way be called in vain, remember that many modern turbochargers have variable geometry vanes, and most modern engines, turbojet aircraft regulate the flow of the rotors, which are installed between each row of compressor blades in axial flow. Office of the increase of torque at all speeds will enable to reduce the number of gears in an automatic (AUTO), but several engineers reasoned that lighter gear to finish more than increasing the complexity of the design using torque converter with a variable geometry. NSovremenny torque – well proven and reliable component, it usually has the same diameter as the flywheel in a conventional transmission. Ring his "donut" is now more flat and looks more like an oval rather than an exact circle, which reduces its size (especially on front wheel drive cars with transverse engine), and without much loss of efficiency.

Most modern torque converters are also equipped with a locking device which eliminates the possibility of slipping when you turn on the highest transmission, which increases overall efficiency. Another vital component of a conventional automatic transmission (automatic transmission) is a planetary gear transmission, which uses long-established principle, although some confusion. The simple planetary gear set is from the central "sun" gear and outdoor gear in the form of rings, which are located inside the tooth, and these two gears are interconnected by means of several (usually three) of gears, called "satellites" mounted on a common frame.