As one of the key components in wind power systems, internal gear for wind power must be designed with high strength to withstand the high torque and changing loads required in wind power generator systems. Its high-strength design features are as follows:

Material selection: The high-strength design of wind power internal gears first involves material selection. It is usually made of high-strength alloy steel or special alloy materials. For example, common materials include alloy steel, such as 20CrMnTi, 42CrMo, etc. These materials have excellent mechanical properties, such as high tensile strength, high hardness, good wear resistance and corrosion resistance, to meet the use requirements of internal gears under high load conditions.

Strength calculation: During the design process, detailed strength calculations must be performed to ensure that the internal gear can withstand various loads from the wind turbine system. This includes static loads, dynamic loads, and irregular loads due to wind changes. Strength calculations need to take into account factors such as the gear's geometry, material properties, and working conditions, and use engineering methods such as finite element analysis to ensure that the internal gear will not suffer from fatigue fracture or plastic deformation during its design life.

Optimized design: High-strength design also includes optimized design of internal gear structure. By optimizing the geometric parameters such as the number of teeth, module, and tooth width of the gear, as well as the shape of the gear, arc tooth line design, etc., the internal gear can have better strength and stiffness when bearing high loads, while reducing the weight of the internal gear. 

Heat treatment: In order to further improve the strength of the internal gear, a heat treatment process is usually used to treat the internal gear. Common heat treatment processes include quenching, carburizing, tempering, etc., which change the structure and properties of the material, improve its hardness and strength, and enhance fatigue and deformation resistance.

Surface treatment: In addition to the basic strength design of internal gears, surface treatment is also one of the important means to improve the strength of internal gears. Surface carburizing, nitriding, nitriding and other processes can be used to form a high-hardness surface layer, improve the wear resistance and fatigue resistance of the internal gear, and extend the service life.

The high-strength design of wind power internal gears requires comprehensive consideration of material selection, strength calculation, optimized design, heat treatment and surface treatment to ensure that the internal gears can operate stably under high loads and harsh working environments, thereby protecting the entire wind power system.