Harmonics Analysis of Triple-Phase Induction Motor Drive

Multi-phase machines have more than three phases. Induction motors have many advantages: low cost, robustness, rigid construction, no need for brushes and commutator segments (squirrel cage type), and longer life. In addition to these advantages of induction machines, multi-phase induction machines can drive a heavy load while decreasing torque pulsations and stator current ripple multi-phase machine drives are utilized in a wide range of applications, including but not limited to ship propulsion, electric aircraft, electric traction, hybrid electric vehicles, and various other industries. The present study uses a MATLAB/Simulink model in a stationary reference frame to examine induction motor drives’ transient and steady-state characteristics with three, six, and nine phases. The present investigation undertakes a comparative analysis of the harmonics in the stator and rotor currents of induction motors with three, six, and nine phases, all of which possess identical power ratings. The motors were supplied with power directly from a balanced sinusoidal three-, six-, or nine-phase power source or through a three-, six-, or nine-phase inverter. This work aims to identify and contrast the differences in current harmonics between the various motor configurations. LC filters reduce the harmonics of inverter output voltage and stator and rotor current harmonics. The Simulink model of three, six, and nine-phase induction motors is developed using standard machine equations in this work. Speed, torque, flux, and current characteristic curves are compared for three-, six-, and nine-phase induction motors.