axial flux permanent magnet (afpm) machines are attractive candidates for electric vehicles (evs) applications due to their axial compact structure, high efficiency, high power and torque density. this paper presents general design characteristics of afpm machines. moreover, torque density of the machine which is selected as main objective function, is enhanced by using genetic algorithm (ga) a...

The SRM drive operates over the entire speed range and provides low torque ripple with smooth transition between the control operations. The low torque ripple is achieved by controlling the firing angles through simple formulas so as to minimize the pulsations of the total current in the commutation region. The smooth transition is attained since the conditions that determine the firing angles ...

This paper presents the analysis, design and implementation of cost effective sensorless control scheme of Brushless DC Motors (BLDCM). There are several methods proposed in BLDC motor drives to obtain optimum current and torque control with minimum torque pulsation. But while coming to industrial applications, BLDC motor voltage contains harmonics which are caused because of high speed switchi...

nowadays the use of the switched reluctance motors (srms) has been considerably increased in various home and industrial applications. despite of many advantages of this type of motors, such as simple structure, low cost, and high reliability, the main disadvantage of them is the generation of high torque pulsation. this paper presents a novel method to optimize a typical srm such that the torq...

The torque ripple of a switched reluctance motor (SRM) limits its application in electric vehicles. This paper proposes DITC system for SRMs based on novel multilevel converter (MLC), which aims at the problem that cannot be effectively suppressed conventional direct instantaneous control (DITC) an SRM due to limitation DC bus voltage asymmetric half-bridge (AHBC) and single strategy formulated...

Doubly salient electromagnetic machine (DSEM) can constitute a competitive rugged starter generator (SG) system. But under the traditional startup control method, field current is set to rated value regardless of speed or load torque conditions, and phase currents are controlled with standard angle commutation, bringing in large power loss as well non-negligible ripple. To overcome these shortc...

This paper proposes a torque ripple reduction for brushless DC (BLDC) permanent magnetic (PM) motor drive based on the DC-link voltage pulse amplitude modulation (PAM). The proposed method improves drawback BLDC drives at low speed. have better inverter efficiency and requires position sensing resolution. However, both freewheeling current during diode conduction discontinuous phase cause high ...

Abstract A novel hybrid control strategy for reducing torque ripple in permanent magnet brushless direct current motors has been developed by combining the deterministic nature of and adaptive fuzzy logic control. Direct using space vector pulse width modulation developed. This technique ensures near-sinusoidal stator rotor current. The impact commutation corresponding to sinusoidal is reduced ...