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This paper is based on designing a modifi ed rotor for a drivetrain in a Type-III wind turbine system for maximum power generation to work eff ectively under low and high wind speed and its variation. In this paper three drive trains are designed for the gearbox to provide regulated torque and thrust force. For time to time variation in wind speed the voltage sag and during over speed condition voltage swell problem can be solved by using this modifi ed design. The pitch control, gear box and yaw of the wind turbine basically focused for modifi cation. Mainly the gear box for the rotor causes sluggish motion of the rotor during low wind speed. This paper explained the design of modifi ed rotor control for the gear box in DFIG based (Type-III) wind turbine. Also in this paper how the modifi ed rotor system can be helpful for reactive power control highlighted with comparison with existing models. For designing MATLAB Simulink platform is taken and validated using CFD mechanical design analysis. Using these types of modifi ed drive trains maximum power for the wind turbines is enhanced by 40-60% of its reference value.