Aiming at the problems of the pressurerise and power imbalance and the problem of serious reduction of efficiencywhen the contrarotating axial flowfan deviates from the rated operatingpoint

the twostage drive motor of the fan is studiedIn this paper

the singlewinding and double speed motor is designed to drive the impeller of the contrarotatingaxial flowfanAccording to motor winding theory

with the method of symmetryaxis to design the 6/8 pole winding typeThe finite element simulation analysissimulation analysis of the double speed pole motor show that the twospeed motorhas good performance in two kinds of polesThe fan can adjust the speed ratio ofthe impeller according to different working conditions

so as to keep the fanworking in efficient operation areaIn addition

the design of single windingtwospeed motor reduces the height of center and manufacturing costs bycomparing the motor with the original fan