High Efficiency (>92%) Coreless Permanent Magnet Generator with Low Start Torque (<0.03 N*m) and Axial Flux Design for Industrial Applications

The GREEF NEW ENERGY GDG series disc type permanent magnet generator without an iron core represents an innovative design in permanent magnet technology. This unique configuration features a disc-shaped arrangement where the spindle and rotor are positioned in a flat disc structure, with the stator fixed at the center and the rotor spinning on both sides.

The spindle contains only windings without an iron core, while both stator and rotor utilize a flat disc structure operating with axial air gap magnetic flux. Positioned alternately along the axial direction, this design offers a short axial length with large diameter, easily accommodating a multi-pole structure.

This generator delivers a high power-to-mass ratio and performs efficiently at low speeds, including starting at low wind speeds. The compact size, low energy consumption, light weight, and robust streamlined structure contribute to high efficiency, making it particularly suitable for direct-drive vertical axis wind turbines where the rotor's vertical position ensures minimal wind resistance.

The GDG series includes two primary variants: outer rotor and inner rotor types. The outer rotor design features a stationary shaft with rotating rotor casing and center cable routing, while the inner rotor design maintains a fixed rotor casing with rotating shaft and external cable discharge.

• Low Start Torque Technology: Absence of hysteresis and gear notch effects results in exceptionally low starting torque below 0.1 N*m, enabling smooth and efficient system initiation.
• High Efficiency: Elimination of core reduces mechanical resistance and energy loss, while "Precise Coil" technology ensures optimal electromagnetic properties and operational accuracy.
• Advanced Magnet and Design: Utilizes rare earth permanent magnets with multiple poles and small air gap for high power density and substantial output power. Brushless gearless direct drive mechanism minimizes maintenance and improves reliability.
• Higher Reliability and Longer Life: Specialized structure offers outstanding power-to-volume and power-to-weight ratios with lifespan extending eight times longer than traditional generators.
• Improved Utilization and Heat Dissipation: Enhanced low wind speed operation with excellent heat dissipation through aluminum alloy outer frame and unique internal structure for stable temperature control.

Greef offers customized Coreless Permanent Magnet Generators (Model Number: GDG) designed to meet specific requirements. Originating from Qingdao, our generators are CE certified and ensure high quality and reliability. We specialize in inner-rotor generator designs featuring small air gap technology for enhanced performance and efficiency.

Our generators feature robust aluminum alloy shells and steel shafts ensuring durability and long service life. The structure can be tailored to either inner or outer rotor configurations with start torque below 0.03N/M and Y winding method for smooth, efficient operation.

We accept minimum order quantity of 1 set with negotiable pricing. Packaging utilizes foam and plywood cases for safe delivery with typical delivery time of 25 working days. Flexible payment terms include T/T, Western Union, MoneyGram, and L/C.