Low Start Torque High Efficiency Maintenance-Free Permanent Magnet Generator with Axial Flux Coreless Design

The GREEF NEW ENERGY GDG series is a disc-type permanent magnet generator that operates without an iron core. In this innovative design, the spindle and rotor are arranged in a disc shape, where the stator is fixed in the center and the rotor spins on both sides. Notably, the spindle contains only windings and does not include an iron core.

Both the stator and the rotor take the form of flat disc structures, utilizing axial air gap magnetic flux. They are positioned alternately along the axial direction. Owing to the generator's short axial length and large diameter, it easily supports a multi-pole configuration. This design leads to several advantages such as a high power-to-mass ratio, low speed rating, the ability to start at low wind speeds, compact size, minimal energy consumption, lightweight construction, and high efficiency.

Due to its low aerodynamic resistance when mounted on vertical axis wind turbines, the GDG series is especially well-suited as a direct-drive solution. The rotor's placement on the vertical axis turbine ensures reduced wind resistance, enhancing overall performance.

The GDG series permanent magnet generators come in two main variants: outer rotor and inner rotor types. In the outer rotor type, the rotor casing remains stationary while the shaft rotates, with cable output routed through the center of the shaft. Conversely, the inner rotor type features a stationary casing with the shaft rotating, and cables are discharged outside the casing.

• Low Start Torque Technology: Features no hysteresis and eliminates gear notch effects, resulting in exceptionally low starting torque of less than 0.1 N*m
• High Efficiency: Coreless design significantly reduces mechanical resistance and energy loss, enhanced by "Precise Coil" technology for optimal performance
• Advanced Magnet and Design: Equipped with rare earth permanent magnets and multiple poles, along with small air gap for high power density and substantial output power
• Maintenance-Free Operation: Gearless direct drive and brushless design simplify structure and eliminate maintenance requirements
• Higher Reliability: Special structural design allows greater power-to-volume and power-to-weight ratios, with lifespan up to eight times longer than traditional generators
• Optimized for Low Wind Speeds: Provides higher utilization for wind turbines operating in low wind speed conditions
• Excellent Heat Dissipation: Aluminum alloy outer frame with unique internal structure offers superior heat dissipation

• Wind Power Generation: Axial flux coreless generators enhance output density for megawatt-class wind turbines, improving wind-to-electric energy conversion efficiency
• Renewable Energy Applications: Extensive use in solar and wind power systems due to superior energy conversion efficiency and dependable performance
• Other Industrial Uses: Applied in industrial contexts requiring efficient, lightweight, and reliable power sources, including backup and auxiliary power units
• Customized Solutions: Flexible design allows customization of power output, rotational speed, and voltage levels to fit diverse operational scenarios

Product Packaging: The Coreless Permanent Magnet Generator is carefully packaged to ensure maximum protection during transit. Each unit is securely wrapped in anti-static foam and placed inside a sturdy, custom-fitted cardboard box. The packaging includes shock-absorbing materials to prevent damage from impacts and vibrations. Additionally, all accessories and documentation are neatly organized within the package to avoid any movement or loss.

Shipping: We offer reliable shipping options worldwide, using trusted carriers to ensure timely delivery. The Coreless Permanent Magnet Generator is shipped with tracking information provided to the customer for full shipment visibility. For international orders, appropriate customs documentation will be included. We recommend selecting expedited shipping for urgent orders to minimize delivery time. Handling and shipping fees vary based on destination and shipment size.