Fuzzy PI based speed sensorless speed control of position sensorless BLDC drive

The Sensorless control of permanent magnet brushless DC motor is presented in this paper. The development of advanced sensorless motor drive has been increases rapidly, because of their higher performance and reliability. The fuzzy PI controller is developed for controlling the speed and position of the PMBLDC motor drive. Here the sensorless control is based on indirect back EMF detection which was justified by the observation that the position sensing is obtained indirectly from zero crossings of terminal voltages. Closed loop speed control is made with estimated speed from the stator voltage, so the drive proposed without any shaft mounted devices like position sensor and speed sensors. In this Sensorless technique is eliminate the cost of mechanical components such as sensors and cables. The performance of the proposed fuzzy logic controller based PMBLDC motor drive was investigated and the results are compared with conventional PI controller. The simulated results of conventional and fuzzy controller illustrates that the FLC gives better dynamic performance also it is more robust for industrial speed control drive applications.