This paper presents the overall review of torque ripple reduction techniques in brushless DC motors (BLDC) and different multilevel inverter topologies suitable for BLDC motor drives. BLDC motors are widely used for household applications due to its features of high reliability, simple frame, high efficiency, fast dynamic response, compact size and low maintenance, etc.. The switches are electr...

A New Adaptive Self-Tuning Fourier Coefficients Algorithm for Periodic Torque Ripple Minimization in Permanent Magnet Synchronous Motors (PMSM) Torque ripple occurs in Permanent Magnet Synchronous Motors (PMSMs) due to the non-sinusoidal flux density distribution around the air-gap and variable magnetic reluctance of the air-gap due to the stator slots distribution. These torque ripples change ...

The proposed reluctance motor has a rotor which consists of flux barrier type iron cores with slits to isolate magnetic flux. The iron cores are processed with press machines , and are easy for mass-production and assembly. The stator has the same structure as that of an induction motor. The motor has excellent controllability and very small torque ripple. We have made up an experimental motor ...

This paper presents a modified two level inverter topology to improve the low speed performance of the direct torque controlled (DTC) three phase induction motor drive. Proposed method is based on current ripple principle. In this technique, the inverter switching states are derived as a function of rotor speed. This method gives low ripple in flux and torque at low speed operation when compare...

Hybrid Stepper Motors (HSM), together with the microstepping driving technique, are widely used in many motion control applications, given their low cost and high reliability. On the other hand, being controlled in an open loop fashion, they cannot achieve high levels of performance, this mainly due to the absence of a load-side position sensor. In this paper, we address the problem of controll...

Switched Reluctance Machines are receiving significant attention from industries, because of its simple structure; inexpensive manufacturability and reliability make it superior to other electric machines. The objective of this paper is to achieve desired speed performance of 6/4 Switched Reluctance Motor (SRM) with reduced torque ripples. To achieve improved speed performance, PI+FUZZY control...

We present a solution to torque ripple minimization in switched reluctance motors (SRM) based on set invariance theory. We start from a piecewise affine approximation (PWA) of the overall torque characteristics over rotor angle – phase currents space and derive a PWA motor model. Within it we also take into account finite bandwidth of the phase current control loops. Using the PWA model and inv...

The aim of this article is propose a method to improve the direct torque control and design a Fuzzy Logic based Controller which can take necessary control action to provide the desired torque and flux of an asynchronous machine. It’s widely used in the industrial application areas due to several features such as fast torque response and less dependence on the rotor parameters. The major proble...

A new off-line current modulation using a neuro-fuzzy compensation scheme for torque ripple reduction in switched reluctance motors (SRMs) is presented. The main advantage of the proposed technique is that the torque signal is unnecessary. The compensating signal is learned prior to normal operation in a self-commissioning run, capturing the necessary current shape to reduce the torque ripple. ...

The Direct Torque Control (DTC) is one of the most effective control and modern methods for high performance AC drives in a wide variety of industrial application and conventional DTC technique uses two constant reference values stator flux and torque ripple. In this paper, two approach intelligent techniques such as fuzzy logic (FL) and Artificial Neural Networks (ANN) used to improving the pe...