Using DTC Method to Reduce Torque Ripple in BLDC Sensorless Motors

In this paper to estimate the rotor position in sensorless BLDC motor drive, the method of the ratio functions line by line flux is used. This method, compared to other methods which are evaluated to estimate the rotorposition, has low software and hardware volume and therefore, its implementation is easy and also manufacturingcost is less. Also this method has an appropriate efficiency in a wide range of speed and estimate the rotor position is independent of speed and rotor frequency. Also in this paper, Direct Torque Control (DTC) method is used to design sensorless BLDC motor drive. DTC is one of the most innovative and efficient methods in control of the electrical machine. High speed in response to changes in torque, simplicity of implementation, independence to machine parameters and needs of less computation are the advantages of this method. At the end of this paper, simulation results by using software MATLB shows good function of sensorless BLDC motors with DTC method.

کلیدواژه ها:

Sensorless ، BLDC motor ، DTC method ، torque