Fans and water pump are the general machinery with enormous quantity and wide range, whose power consumption is up to 50-60% of total power generation in the nationwide every year. Above 70% of asynchronous motors with small and medium size are used to drive the fan and pump. We mainly use the way that adjust the values to increase the resistance, so as to achieve the purpose of control the flow. Therefore, throttling power consumption is rather enormous. If we can change the way that drive the speed of motors to regulate the flow of fan and motor, then it can improve the system’s efficiency greatly and save the cost. YDT series, as a three phase asynchronous motor with changeable pole and multiple speed, is a efficiency, energy conservation, simple, reliable and economic drive power, which is specially designed for fan, water pump etc. that liquid load need the flow to regulate the conjunction.

The characteristic of Fan and special motor pump
     1、This series of motor use the specially designed winding program
     2、The corresponding relationship between the power and frame size is basically same as Y series motors, namely double speed motor’s high speed, most of them are equal or close to single speed motor, the same power and speed that corresponding with height of center, so that users can choose and construct for energy.  
     3、The setup of motor power is based on the fan and water pump’s load characteristic, design based on torque is direct ratio with the square of speeds, and the power needed is direct ratio with the cube of speed. Therefore, whether running with high speed or low speed, it will have high efficiency and power factor.
     4、This kind of motor changes the connection by the winding of itself to achieve the purpose of change speed. So it does not need a complicated control system. It can perform safely without any special maintenance once after your low investment.   
     5、The exterior and mounting dimension of this motor are the same as Y series single speed three phase asynchronous motors.