1.General YR series large-scale wound rotor three-phase asynchronous motors are designed by the technical personnel of our company to satisfy the market requirements and replace the old products. The mounting dimensions, power grades, electrical performance of these motors all comply with the previous standard. These motors adopted advanced technical result of the motor industry in recent years more in the production, 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 IM7311. 2.Configuration The base of the motor is welded by steel plate. Its configuration is compact and comfortable, thus the rigidity and stability is good. 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 wound rotor adopts advanced craft and high quality materials, which can ensure the starting torque is more large, the performance is more reliable, operation is more placidity. The basic protection class of the YR series large-scale three-phase asynchronous motors is IP00. We can also manufacture derived series motor under the order request such as IP44 etc. 3.Application These motors can be used to drive different general machines such as compressor, water pump, crusher, cutting machine, transportation equipment and other facilities, it is widely used in the power plant, mine, machine industry, building material industry, petroleum and chemical industry, etc.