Highly Efficient Brushless Dual-rotor Contra-rotating Wind Power Generation System

Principle Investigator:
Prof. NIU Shuangxia, Professor, Department of Electrical and Electronic Engineering

The most common wind turbines on the market feature a horizontal-axis single-rotor design, which, according to Betz's theory, can extract a maximum of only 59% of the available wind energy. To effectively utilise this wake energy and enhance power generation, our invention introduces a compact, brushless, high-efficiency contra-rotating generator and systems, increasing wind energy utilization by 10%–20%.

Key benefits:
• Integrated and compact design: Unlike traditional dual-rotor systems with two separate units, our system integrates both into a single, compact structure, reducing space requirements and simplifying installation.
• Brushless and maintenance-free: The magnetic-geared structure eliminates mechanical wear, ensuring long-term, maintenance-free operation.
• Improved energy conversion efficiency: Contra-rotating rotors boost energy conversion rates, increasing wind energy utilization by 10%–20%.

This technology doubles the induced voltage at low wind speeds, reduces system volume, and greatly improves wind energy efficiency, making it ideal for residential and commercial applications.