1. General Y series large-scale high voltage three-phase asynchronous motors (Frame sizes 710-1000), are our new generation products designed and manufactured by the technical personnel of our company who summarized more than ten years trial manufacture experiences for large-scale Y series motors and absorbed the advanced technique abroad. The mounting dimensions, power grades, electrical performance of these motors all comply with the national standard GB755-2000 Rotating electrical machines--Rating and performance, national standard GB/T13957-92 Large-scale three-phase asynchronous motor basic series technique condition (Frame sizes 710-1000) and relevant IEC international standard. Compare with the national design project previous, these motors adopted advanced technical result of the motor industry in recent years more, therefore the configuration is more reasonable, and the craft is more advanced, the motors are with features of high efficiency and power factor, low noise and vibration, reliable performance and convenience for mounting and maintaining. The rated frequency of the motor is 50 Hz, and we can also provide 60 Hz or special frequency motor under the request of the order. The configuration and mounting type of the motor is IMB3 and the cooling method is IC01,IC11,IC21 or IC31. 2. Configuration The motor has a box structure and the base is welded by steel plate. Its configuration is compact and comfortable, thus the rigidity and stability is good; The stators of our motors are mounted by outside press method to parallel work and shorten the production period; The windings are made of class F insulation materials, temperature rise will be considered on class B to extension the life; At each end there are reliable fastness and colligation. During processing, they are suffered many times of pulse voltage tests on windings interlayer and voltage endurance test to ground, and the motor has excellent insulation, strong mechanical and fine moisture protection. The squirrel cage rotor is the copper bars configuration, which can reduce the lost and improve the efficiency, the bar and end ring are welded in a whole set with advanced intermediate frequency welding craft, fastness and endurance. We can manufacture motors with cast a