It is difficult to make a structure of multilevel inverter for the efficient conversion of dc to ac having a smaller number of power electronic components, less switching losses, less voltage stress on switches, and a greater number of output voltage levels. To breakthrough this problem, a modification is performed in the existing H-bridge multilevel inverter to form a switch ladder modified H-bridge multilevel inverter (SLMHB-MLI). Moreover, for the minimization of maximum voltage rating on the switches and optimization of switching sequence of the multilevel inverter, a novel pulse width modulation (PWM) technique is proposed in this research. Furthermore, in SLMHB-MLI, the novel PWM technique is integrated with an ANDed PWM technique for the variation of output voltage magnitude. The usefulness of the proposed topology and PWM technique are confirmed via comparison with previous topologies simulation and experimentation, respectively. INDEX TERMS ANDed and novel PWM techniques, switch ladder multilevel inverter, total harmonic distortion.

No abstract

No abstract

No abstract

No abstract

Summary In this paper, an interior permanent magnet synchronous motor with a D‐type rotor configuration is presented. The performance of the proposed motor is compared with that of the widely used V‐type interior permanent magnet synchronous motor. For a fair comparison, all the motor parameters are identical. With the advent of different rotor topologies, multilayered and multisegmented permanent magnets are extensively used; however, an analytical modeling of D‐type interior permanent magnet synchronous motor has not yet been conducted. Furthermore, its analysis using the finite element method is considerably time‐consuming. To resolve this problem, an analytical method based on a magnetic equivalent circuit is proposed for the slotless D‐type interior permanent magnet synchronous motor. It is then compared with the finite element method at different pole arc–pole pitch ratios to demonstrate the effectiveness of the proposed method. Additionally, Schwarz‐Christoffel mapping is employed to maintain the slot shape and include the effect of adjacent slots by considering the slotting effect in the slotless air‐gap flux density. Finally, the presented motors are optimized based on the pole arc–pole pitch ratio to maximize the fundamental air‐gap flux density and minimize the total harmonic distortion.

No abstract

No abstract