Sensorless Control of Z Source Inverter fed BLDC Motor Drive by FOC - DTC Hybrid Control Strategy Using Fuzzy Logic Controller

In Sensorless control, current sensors are used in the feedback control loop, which are cheap compared to the rotor-position sensor of permanent magnet brushless direct current motor (PMBLDCM) drive. The control operations of the brushless drives are simple and improve its relevance to many cost- sensitive applications. The Sensorless control necessitates cost saving in the feedback control and needs only six discrete step positions for a three-phase machine and does not require any vector operations. The hybrid controller for the ZSI-BLDC motor drive is robust against the harmonics present in voltage/current quantities, combines and takes benefits of the features of field-oriented and direct torque control (FOC-DTC) offered by each technique respectively. Sensorless control of PMBLDC motor drive by hybrid control of Z source inverter employs fuzzy logic control technique for better results. The drive finds applications in wide speed range of highperformance applications and robust to harmonics.