Features: 1PURE COPPER WINDING: 3 phase wind power electric generator alternator adopts pure copper winding and the generator can produce high efficiency and stable power. 2STARTUP LOW RESISTANCE TORSION: This magnet alternator has specially designed rotor low resistance torsion at startup good cooling effect. 3GEARLESS: Wind power electric generator alternator is the gearless permanent magnet generator direct drive low speed. 4SIMPLE AND SAFE OPERATION: This electric generator is simple and safe operation and maintenance. Easy to operate and install. 5WIDE USE: 3 phase wind power electric generator alternator is reliable and can be used for home yard or industrial working laboratories. Specification: Item Type: GeneratorShell: Aluminium alloy Generator Type: Permanent magnet 3 phase alternatorRated Speed: 750rpmNumber of Magnetic Pole Pairs: 12Conversion Efficiency: 85%Working Temperature Rise: 70Main Shaft Material: Carbon SteelMagnet Material: Neodymium iron boron materialLubrication Method: Grease fillingInsulation Grade: H gradeWorking Temperature: -40-120Service Life: 20 yearsSize: Approx. 17 x 15 x 15.5cm / 6.7 x 5.9 x 6.1in Package List: 1 xPermanentMagnetWindGenerator