Reza Heidari - Department of Electrical Engineering, Shahrekord University, Iran
Gholam Reza Arab Markadeh - Department of Electrical Engineering, Shahrekord University, Iran
Saeed Abazari - Department of Electrical Engineering, Shahrekord University, Iran,
Mohsen Hosseinzadeh Soreshjani - Department of Electrical Engineering, Shahrekord University, Iran

Direct torque control (DTC) can directly control the inverter states in order to reduce the torque and flux linkage errors within the prefixed band limits. In this paper a DTCtechnique is presented for brushless dc (BLDC) motors with nonsinusoidal back-EMF using four-switch inverter in the constant torque region. In addition, for torque ripple reductionin two phase conduction mode, a novel switching pattern incorporating with the voltage vector look-up table is designedin order to regulate the controllable phases torques (Tea , Teb). Simulation results approve that the proposed method reducestorque ripple in contrast with prior research

Brushless DC (BLDC) drives, direct torque control (DTC), fast torque response, four-switch inverter,Torque ripple reduction