... cogging torque. Furthermore, it formulates key motor performance parameters as functions of the magnet reduction factor and investigates the impact of optimal magnet shaping on motors with rotor eccentricity. Design/methodology/approach The core idea is to model the outer magnet surface...

...Zuoguang Yan; Shaopeng Wu; Meng Zhang; Pinjia Zhang Purpose This study aims to alleviate the high cogging torque and torque ripple problems of the stator permanent magnet electrical machine (SPMEM) used in the flywheel energy storage system, which result from its double salient structure and high...

...Salman Ali; Neelam Qadeer; Luca Ciprini; Fabrizio Marignetti Purpose The purpose of this study is to reduce the cogging torque in axial flux permanent magnet (AFPM) machine using optimal magnet shape. Design/methodology/approach This study analyzes different magnet shapes for AFPM machine...

...Jie Wu; Kang Wang; Ming Zhang; Leilei Guo; Yongpeng Shen; Mingjie Wang; Jitao Zhang; Vaclav Snasel Purpose When solving the cogging torque of complex electromagnetic structures, such as consequent pole hybrid excitation synchronous (CPHES) machine, traditional methods have a huge computational...

...Lidija Petkovska; Paul Lefley; Goga Vladimir Cvetkovski Purpose This paper presents the design techniques applied to a novel fractional-slot 6/4 pole permanent magnet brushless direct current (PMBLDC) motor, for cogging torque reduction. The notable feature of this motor is the simplicity...

...Brahim Ladghem Chikouche; Kamel Boughrara; Rachid Ibtiouen Purpose This paper aims to the improvement of permanent magnet shape in the popular permanent magnet synchronous machine (PMSM) is proposed in this paper in view to mitigate cogging torque magnitude and torque ripple. Design/methodology...

... on claws of one part of the rotor. The paper presents construction of the machine and analysis of the current in the excitation control coil influence on the electromagnetic torque, cogging torque and back-emf values. Presented studies enabled the determination of the torque and the back-emf for both...

...Young Hyun Kim; Jung Ho Lee Purpose This study aims to propose criteria for both optimal-shape and magnetizer-system designs to be used for a high-output spoke-type motor. The study also examines methods of reducing high-cogging torque and torque ripple, to prevent noise and vibration. Design...

...Behrooz Rezaeealam; Farhad Rezaee-Alam Purpose The purpose of this paper is to present a new optimal design for integral slot permanent magnet synchronous motors (PMSMs) to shape the air-gap magnetic field in sinusoidal and to reduce the cogging torque, simultaneously. Design/methodology...

... torque on air-gaps was obtained by Maxwell stress tensor. In order to simulate the movement of both rotors in relation to the winding and modulators two movement bands were applied. Findings It was proved that the MGFIG magnetized with Halbach arrays is able to eliminate the cogging torque, improve...

...Z.Q. Zhu; Jian-Xin Shen; Shun Cai; Jian Yuan; Shuai Cao; Cen-Wei Shi Purpose – The purpose of this paper is to evaluate the cogging torque in a surface-mounted permanent magnet (SPM) machine with both uniformly and non-uniformly segmented stator cores and to find out the optimal solution...

...Umadevi Nagalingam; Balaji Mahadevan; Kamaraj Vijayarajan; Ananda Padmanaban Loganathan Purpose – The purpose of this paper is to propose a multi-objective particle swarm optimization (MOPSO) algorithm based design optimization of Brushless DC (BLDC) motor with a view to mitigate cogging torque...

...Professor Slawomir Wiak; Lidija Petkovska; Goga Cvetkovski; Paul Lefley Purpose – The purpose of this paper is to investigate the impact of the stator core design for a surface permanent magnet motor (SPMM) on the cogging torque profile. The objective is to show how the cogging torque...

... the inaccuracy of the applied finite element model itself. Thus, the purpose of this paper is to analyze the influence of mesh quality on stochastic cogging torque calculations. Design/methodology/approach – The presented work consists of three steps. At first, a conventional analysis of the influence...

... method to suppress the total torque ripple. Design/methodology/approach – Besides the well-known cogging torque and mutual torque ripple, a new ripple which exists in the reluctance torque is found. It is verified with both analytical model and finite element analysis. Also, a novel method...

...Siavash Sadeghi; Leila Parsa Purpose The purpose of this paper is to minimize the torque pulsation in Halbach array permanent magnet synchronous machines (PMSMs). Design/methodology/approach Because of its specific structure, the cogging torque influences the main part of the torque pulsation...

.../approach A magnetic‐geared motor with permanent magnets only on the high‐speed rotor was proposed and its operational principle was described. The cogging torque characteristics were mathematically formulated and the authors ascertained that the cogging torque contains components of multiples of 60th...

...Slawomir Wiak; Lidija Petkovska; Paul Lefley; Goga Cvetkovski Purpose The paper presents design development of a novel high‐performance low‐cost 6/4 pole permanent magnet brushless DC (PMBLDC) motor. The objective is to show how the cogging torque of this new design is minimised by determining...

... machine operation, there has to be a rotating magnetic field, which can be represented as following: Equation 1 with w angular speed of the energy source. © Emerald Group Publishing Limited 2012 Cogging torque Electromagnetic torque Parallel flux switching Superposition...