Based on the relevant literatures, it is found out that modern agriculture is a product of agricultural development at a certain stage. On the one hand, modern agriculture develops with the improvement of economy; on the other hand, it has many realization forms. Different areas and countries...

A Variable Ratio Gearbox (VRG) can be used in the drivetrain of a small to medium-size wind turbine to improve aerodynamic efficiency. Currently, all commercially-available wind turbines operate using a fixed-gear ratio between the turbine rotor and electrical generator. A VRG allows wind...

Variable-speed wind turbines are able to adapt to low wind speeds and therefore have greater efficiency than fixed-speed turbines during partial-load operation. Unfortunately, the high cost and low reliability of the electronics that enable variation in speed have discouraged this mode of...