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High voltage motor is the motor of rated voltages above 1000V. Always use 6000V, 10000V voltage due to different overseas power grid also 3300V and 6600V voltage levels. High voltage motors produced by motor power is proportional to the product of the voltage and current, low voltage motor power increases to a certain level (such as 300KW/380V) current is limited by wire allows tolerance is difficult to grow, or cost-prohibitive. Need to achieve high power output by increasing the voltage. Advantages of high voltage motor power, strong ability to withstand impact and disadvantage is inertia, starting and braking hard.

Medium high-voltage motor cooling tube is widely used at present water-air or air-to-air type. Running water tube-type air cooler is cooling through cooling water, wind pressure, the motor internal thermal air flow under the action of cooling the outer surface of the tube and tube heat exchange cooling water, achieve the purpose of cooling the motor; air-to-air-cooling with water-air cooler heat transfer principles, like just cooling pipe cooling water into the cooling air.