Speed Sensorless Control of Magnetic Levitation Blower for Coal Mine Wastewater Treatment

This paper aims to design a variable frequency control system for a magnetic levitation blower used in coal mine wastewater treatment, including signal acquisition components, controllers, and aeration components. The signal acquisition components include gas flow meters, pressure gauges set on pipelines, dissolved oxygen detectors, ORP detectors set in aeration tanks, etc. At the same time, the speed sensorless control of the magnetic suspension blower is studied based on the extended Kalman filter method. The control system in this article can accurately control the intake volume and speed of different types of aeration tanks, and real-time detect the safety of the entire system. The simulation results show that the extended Kalman filter algorithm can complete the speed estimation.