Six-speed powertrain of an automatic transmission of a vehicle

A powertrain of an automatic transmission, comprising:

• a first planetary gear set having first, second, and third operational elements, the first, second, and third operational elements occupying sequential positions in a lever diagram;
• a second planetary gear set having fourth, fifth, and sixth operational elements, the fourth, fifth, and sixth operational elements occupying sequential positions in a lever diagram;
• and
• a third planetary gear set having seventh, eighth, and ninth operational elements, the seventh, eighth, and ninth operational elements occupying sequential positions in a lever diagram,
• wherein:
• the first operational element is fixedly connected to the fourth operational element and always receives an input torque;
• the second operational element is fixedly connected to the seventh operational element and always outputs an output torque;
• the third operational element is variably connected to either of the eighth operational element and the ninth operational element via a second clutch;
• the fifth operational element is variably connected to the ninth operational element via a first clutch;
• the sixth operational element is always stationary;
• the eighth operational element is variably connected to an input shaft via a third clutch and is subject to a stopping operation of a first brake;
• and
• the ninth operational element is subject to a stopping operation of a second brake.