Simulation Analysis of Quasi Space Vector PWM in Different Conduction Modes for Inverter Fed Permanent Magnet Brushless DC Motor Drive

Abstract

It is known that the Space Vector PWM (SVPWM) modulation scheme is superior in driving a three-phase permanent magnet brushless dc (3PPMBLDC) motor through the use of conventional three-phase voltage source inverter (3PVSI). However, implementing SVPWM in an embedded system requires that a high performance chip, such as a DSP chip, be used, not economically suitable for low precision applications such as electric bike motor drive and quad rotor robot motor drive. For  these applications, it is acceptable to adopt a 3PVSI with a simpler modulation scheme that can be classified into 3 types, namely, the 120° conduction mode quasi SVPWM (120° QSVPWM), the 150° conduction mode quasi SVPWM (150° QSVPWM), and the 180° conduction mode quasi SVPWM (180° QSVPWM). This paper describes all three modulation schemes and conducts a performance analysis of the 3PVSIs resulting from applying each of the modulation schemes. The performance numbers are obtained through simulations. Eventually, our custom built simulated dynamic model of 3PPMBLDC motor based on the Simulink package in MATLAB software is brought to be verified by our custom built simulated model of 3PVSI with different modulation schemes in order to visualize the torque and mechanical angular velocity(speed) characteristics.

Keywords: Voltage source inverter conduction mode; three phase brushless DC motor drive; space vector voltage source inverter.