rated voltage: 6kv/10kv rated power: from 350kw to 4230kw these motors should be worked on the following indoor conditions: altitude will be not more than 1000m, cooling medium temperature will be not more than 40 centigrade, few atomy, no corrosive gas such as steam, acid gas, alkaline gas, etc. the rated voltage of these motors is 6000v, and we can supply 3000v and 10000v under the customer’s requirements. the permitted fluctuation of rated voltage is +5%, the rated power frequency is 50hz, we can also provide 60hz or special frequency motor under the request of the motor, and the rated power factor is 0.9 (leading). the exciting systems of these motors adapted thyristor-exciting installations. the motor is permitted to start in full voltage. if the electric power network of the customer is not permitted to start in full voltage, it can be stated in drop voltage, meanwhile, the fall of the starting current of the motor is in direct proportion to the terminal voltage, and the fall of the starting torque is in direct proportion to the square of the terminal voltage. these motors are large-scale ac three-phase synchronous motors being used to drive grinding mill for mine. they are mainly used to drive grid ball mill, rod mill, coal mill, etc.