A one million kilowatt hydropower unit of Baihetan Hydropower Station weighs more than 8,000 tons and is more than 50 meters high. During the construction of this behemoth, the precision of many components is calculated in millimeters. Its core component, the rotor yoke independently developed by DEC, is composed of more than 16,000 yoke punching sheets, which are divided into 900 layers. The relative theoretical center deviation is less than 0.02 mm, which is only one-third of the diameter of a hair.

When the rolling water of the Jinsha River continuously pours into the turbine through the penstock to drive the unit to rotate at a high speed, the potential energy of the water is converted into a steady stream of electrical energy. The rotor yoke, the core component of the unit, plays a key role.

The rotor yoke of the hydropower unit with the largest single-unit capacity and the maximum power of one million kilowatts in the world independently developed by DEC is composed of more than 16,000 yoke punched sheets, which are layered into 900 pieces to form this "thousand-layer cake", with a height of nearly 4 meters, a diameter of more than 15 meters, and a heavy weight. Up to more than 1200 tons.Editor/Ma Xue