Control methods for pulsation of torque reduction for the surface-mounted permanent magnet motors are discussed in the paper. The pulsation torque is a consequence of the non-sinusoidal flux distribution and due to interaction of the rotor’s permanent magnets with the changing stator reluctance. Proposed control method is estimator based. To assure parameter convergence Lyapunov’s direct method...

In this paper, hydroforming process of bent tubes in T-shaped die is studied for pulsating and linear pressure paths by the finite element method. Forming Limit Diagrams (FLDs) and thickness distribution curves are used to investigate the effect of pulsating pressure on hydroforming process. In addition, the obtained numerical results are compared with experimental results of hydroforming of st...

The requirement of precise control in servo applications used in the digital systems led to the development of stepper motors. The precise and zero backlash operation of steppers extended its reach to various position control applications. The lack of requirement of sensors for position control applications was one of the main reasons for preferring stepper motors. Since the stepper motors were...

This paper presents a control method, which reduces the pulsating torque and DC voltage problems of a doubly fed induction generator (DFIG)-based wind turbine system. To reduce the torque and power ripple, a current control scheme consisting of a proportional integral (PI) controller is presented in a positive synchronously rotating reference frame, which is capable of providing precise current...

The flux density equations for single and double slotted induction machines are presented. Slot harmonic components in the wave-form comparison between step unslotted airgap surface has been driven. pulsating torque produced by these slot harmonics how it vary with skewing listed. results compared experimental which proved to be good agreement.

Herein, a new torsional device based on shape memory alloy elements and operating as torque limiter is presented. It consists of set pseudoelastic NiTi tapes working in series configuration. The are assembled radially with respect to the rotational direction work sequentially beam‐like bending mode. trend resulting may span from pulsating continuous by changing number tapes. Furthermore, use ma...

This paper presents a magnetic field analysis of an original Doubly-Excited Brushless Reluctance Machine (DEBRM). The stator of the DEBRM consists of two sets windings with different pole numbers. The rotor is an axially laminated structure with a pole number different from either of the stator windings. The finite element method is applied by which the magnetic vector potentials under no-load ...

Abstract: A fault-tolerant permanent-magnet vernier (FT-PMV) machine incorporates the merits of high fault-tolerant capability and high torque density. In this paper, a new remedial control is proposed for a five-phase FT-PMV machine with short-circuit fault of stator windings. Based on the principle of copper loss minimization, the aims of the proposed control strategy are to keep magnetic mot...