A new customized multi-level inverter (MLI) configuration is proposed for induction motor drive, aiming to lower the requirement of DC bus voltage magnitude. This method utilizes pole pair winding coils separately to generate multi-level voltage waveform across the total stator phase windings. As the inverter requires lower input voltage it eliminates the requirement of boost converters when it is used in the EV applications. The inherent advantages of this topology significantly reduce control complexity in the battery systems by reducing the number of series-connected battery cells. The conventional LevelShifted Sine Triangle PWM technique proficiently shifts low-frequency harmonics to the carrier frequency, enhancing power quality and minimizing electromagnetic interference. Through MATLAB simulation, this new customized multi-level inverterfed open-end stator winding Induction motor is simulated and results are presented to validate the proposed concept. Ultimately, our research aims to contribute to advancing electric vehicle technology by operating the induction motor with minimal input DC source voltage, and substantial output gain

This paper investigates the efficacy of V/f scalar control for a three-phase squirrel cage induction motor (IM) integrated with a proportional-integral (PI) controller and MOSFET-based inverter. The key objective is to achieve robust speed regulation and stability under varying load disturbances. In the present work, two control schemes have been delved (a) the closed-loop approach, offering superior performance but less common in industrial settings, and (b) the widely employed open-loop method. Leveraging MATLAB/Simulink, simulations have been performed to compare the performance of three-level and five-level inverter configurations. To quantify the harmonic content, a comprehensive analysis of total harmonic distortion (THD) has been conducted. The study further incorporates the concept of electric vehicles (EVs), exploring how the proposed control strategy could enhance the performance and efficiency of EV drives.

The equivalent circuit of a voltage source inverter (VSI) fed brushless DC (BLDC) motor is similar to a buck converter supplied brushed DC motor. This analogy derives a linear relationship between the duty ratio and motor speed for continuous current conduction mode (CCCM). However, this relationship is not linear for discontinuous current conduction mode (DCCM), which is not generally considered in literature while controllers are designed. The DCCM of the BLDC motor driven by unipolar pulse width modulation (PWM) controlled voltage source inverter is analyzed, and corresponding quasi-steady-state model is derived in this paper. The motor speed can be precisely determined by simple computations with the proposed DCCM model, which can lead to complexity reduction in controller design. The effectiveness of the proposed model has been validated by the simulation and experimental analysis.

A customized multi-level inverter configuration designed for driving an induction motor with multiple pole pairs is introduced. Within the induction motor, each pole pair winding coil spaced 360° (electrically) apart maintains the same voltage profile. In our case, two windings in a four-pole induction motor are deliberately disconnected. A dual two-level inverter is used to power each half of the winding, so two such inverters are used to feed the entire stator winding of the induction motor as pole pair windings are disconnected. The single DC source used to power these inverters has a magnitude of Vdc/4, or 25% of input voltage DC bus voltage needed to power a typical Neutral Point Clamped five-level inverter. This new Pulse Width Modulation approach is used to cancel the harmonics at first center band while controlling the inverter output voltage. This method successfully lowers torque ripple by reducing current ripple. Furthermore, power balancing problems are eliminated because the single DC source is supplying the entire topology. The capacitor voltage balancing problems are also resolved because this design is derived using only two-level inverters. Very few changes to the design are needed for the suggested topology; the main change is to disconnect winding coils with the same voltage profile. The efficacy of the proposed inverter employing the innovative PWM technique in the linear modulation region is demonstrated by simulation results utilizing a 5-hp four-pole induction motor in MATLAB (Simulink)