High Efficiency >92% Coreless Permanent Magnet Generator with Low Start Torque

The GREEF NEW ENERGY GDG series disc-type permanent magnet generator is designed without an iron core. This unique generator features a spindle and rotor arranged in a disc-shaped stack. The stator is fixed at the center, while the rotor rotates on both sides of it. Notably, the spindle contains only windings and lacks an iron core.

Both the stator and rotor adopt a flat disc structure and utilize axial air gap magnetic flux. They are positioned alternately along the axial direction. Due to the disc generator's short axial length and large diameter, it easily supports a multi-pole configuration. This results in a high power-to-mass ratio, low speed rating, and the ability to start at low wind speeds.

Additional advantages include compact size, lightweight design, low energy consumption, and high efficiency. The compact and sturdy structure makes it highly suitable for direct-drive vertical axis wind turbines, primarily because the rotor mounted on a vertical axis imposes minimal wind resistance.

The GDG series disc-type permanent magnet generators are available in two variants: outer rotor and inner rotor configurations to suit various application requirements.

• Low Start Torque Technology: The absence of hysteresis and gear notches results in a very low starting torque, less than 0.1 N*m, ensuring smooth and efficient operation right from startup.
• High Efficiency: The design eliminates the core, significantly reducing mechanical resistance and energy loss, contributing to an overall increase in operational efficiency.
• Advanced Coil Technology: Utilizing "Precise Coil" technology combined with rare earth permanent magnets, featuring multiple poles, small air gap, and high power density for large output power within a compact design.
• Maintenance-Free Operation: Gearless direct drive and brushless configuration mean the device requires no maintenance, enhancing reliability and reducing downtime.
• Higher Reliability: Specialized structural design achieves greater power-to-volume and power-to-weight ratios with a lifespan eight times longer than traditional generators.
• Optimized Low Wind Performance: Improved utilization of wind turbines operating under low wind speed conditions, maximizing energy harvest.
• Excellent Heat Dissipation: Aluminum alloy outer frame combined with unique internal structure ensures stable and durable performance.

• Wind Power Generation: Axial flux coreless generators demonstrate significant promise in wind power generation, particularly for megawatt-class wind turbines where they enhance output density and substantially improve overall efficiency.
• Renewable Energy: Widely utilized in various renewable energy systems including solar and wind energy applications, offering efficient energy conversion and reliable operation for sustainable energy solutions.
• Other Industrial Applications: Suitable for industrial settings requiring efficient, lightweight, and dependable power sources, serving as backup or auxiliary power units for critical industrial machinery.
• Customized Applications: Adaptable design allows for customization of key parameters such as power output, rotational speed, and voltage to suit various application demands and ensure optimal performance.

Greef offers customized Coreless Permanent Magnet Generators, model GDG, designed and manufactured in Qingdao. Our generators feature a coreless wire coil stator and robust aluminum alloy shell, ensuring durability and efficient performance.

With unique inner/outer rotor structure and multi-poles design, these generators provide large output power while maintaining a small air gap for optimal magnetic flux and efficiency. The start torque is less than 0.03N/M, making it ideal for various applications requiring smooth startup performance.

Our Coreless Permanent Magnet Generator is carefully packaged to ensure it arrives in perfect condition. Each unit is securely wrapped in protective materials to prevent damage during transit and placed inside a sturdy, custom-designed box that provides optimal cushioning and support.

We offer various shipping options including standard ground, expedited, and international freight. All shipments are tracked and insured to guarantee safe and timely delivery through trusted carriers.

Before dispatch, each generator undergoes thorough inspection to confirm quality and functionality. We include detailed handling instructions and necessary documentation within the package to assist with installation and maintenance.

For special packaging or shipping arrangements, please contact our customer service team for personalized support.