The Technologies of Sensorless Control Strategy Based on Rotor Initial Position Detection

The technology of sensorless control of permanent magnet synchronous motor is studied.In view of the existing problems of the initial rotor position detection method,three-phase two-phase hybrid conduction method for the rotor initial position detection theory is put forward.After simulation verified its correctness,field experiments are done in experiment platform.Finally,the proposed three-phase two-phase hybrid conduction method is verified that it could detect the rotor initial position quickly and efficiently,and estimation error is the plus or minus 15° electrical angle, at the same time,it has low cost,and is easy to implement,satisfies the requirement of direct-drive permanent magnet wind turbine starter,then it can be used in the field.