Sensorless Control of Z Source Inverter fed BLDC Motor Drive by FOC - DTC Hybrid Control Strategy Using Fuzzy Logic Controller
T. Muthamizhan, P. Saravanan, Ramaprasad Maharana
Abstract
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.