Maintenance-free Coreless Permanent Magnet Generator with Low Start Torque and

The GREEF NEW ENERGY GDG series is a disc-type permanent magnet generator featuring an innovative iron core-free design. This generator employs a stacked disc configuration where the spindle and rotor are arranged with the stator fixed at the center and the rotor rotating on both sides. The spindle contains only windings without any iron core.

Both stator and rotor are constructed as flat disc structures utilizing axial air gap magnetic flux, alternately positioned along the axial direction. The generator's short axial length combined with its large diameter enables a multi-pole design, resulting in a high power-to-mass ratio and efficient low-speed operation.

The GDG series offers significant advantages including low startup wind speed, compact size, minimal energy consumption, lightweight construction, and high efficiency. Its robust structure makes it ideal for direct-drive vertical axis wind turbines, where the rotor placement minimizes wind resistance.

Available in two variants: outer rotor type (stationary shaft with rotating casing, cables through shaft center) and inner rotor type (fixed casing with rotating shaft, cables routed outside casing).

• Low Start Torque Technology: Eliminates hysteresis and gear notch effects with starting torque less than 0.1 N·m for smooth, efficient operation
• High Efficiency Design: Coreless construction reduces mechanical resistance and energy loss using innovative "Precise Coil" technology
• Powerful Magnet System: Rare earth permanent magnets with multiple poles and small air gap deliver high power density and substantial output
• Gearless Direct Drive: Brushless operation minimizes mechanical wear for virtually maintenance-free performance
• Enhanced Reliability: Specialized structural design provides eight times longer lifespan than conventional generators
• Low Wind Speed Optimization: Superior performance in low wind speed environments for increased energy capture
• Excellent Heat Dissipation: Aluminum alloy outer frame with specialized internal structure ensures stable operation and extended longevity

• Wind Power Generation: Ideal for megawatt-class wind turbines, enhancing power output density and conversion efficiency through reduced iron and hysteresis losses
• Renewable Energy Systems: Widely employed in solar power installations and other renewable energy applications requiring efficient energy conversion
• Industrial Power Solutions: Suitable for backup or auxiliary power supplies in sectors demanding lightweight, reliable, and efficient power sources
• Customized Applications: Flexible design allows modification of power rating, operating speed, and output voltage for specific requirements

Greef offers customized Coreless Permanent Magnet Generators (model GDG) featuring robust aluminum alloy shells and NSK deep groove ball bearings for durability and reliable performance. Advanced multi-poles and outer-rotor design deliver large output power efficiently at 50/60Hz frequencies.

Each Coreless Permanent Magnet Generator is securely wrapped in protective materials and placed in sturdy, custom-designed boxes with cushioning support. Multiple packaging layers ensure damage-free transit with clear handling instructions and product labeling.

Shipping options include standard, expedited, and freight services with delivery times ranging from 3-14 business days. Tracking information provided upon dispatch through reliable carriers. Contact our customer service team for specific packaging or shipping requirements.