Integral centrifugal fan driven without position sensor

The invention relates to the technical field of fans, in particular to an integral centrifugal fan driven without a position sensor, which comprises a motor, an impeller and an air inlet, wherein the motor consists of a stator, an outer rotor, a rotor shaft and an end cover, and one end of the impeller is connected with the air inlet. The integral centrifugal fan driven without the position sensor is characterized in that the other end of the impeller is connected with the outer rotor of the motor, a drive is arranged in the motor and is fixedly connected with the end cover, the end cover is connected with the stator of the motor, so an integrity is formed to increase the heat dissipation performance of a module, the drive consists of a power amplifier board and a control board, a main circuit, an inlet wire default phase detection circuit, a bus current detection circuit, an undervoltage and overvoltage detection circuit, a counter potential detection circuit and a switching power circuit are arranged on the power amplifier board, and a digital signal processing (DSP) control system circuit and a communication module circuit are arranged on the control board. Because the structure is adopted, the motor, the drive and the impeller are integrated, the efficiency is greatly improved, and the energy consumption is reduced, so the integral centrifugal fan provided by the invention has the advantages of compact structure, high power density, high efficiency, low noise, high integrity, low cost and the like.