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This paper presents analysis of cogging torque and torque ripple according to unevenly magnetized magnet patterns in permanent magnet synchronous motor. In previous studies it has confirmed that non-uniformly magnetized permanent magnet causes unexpected increase of cogging torque and torque ripple because of slot harmonic components. However, these studies investigated insufficient number of irregular...
A magnetically geared machine (MGM) integrates a magnetic gear with a low torque, high speed electric machine to create a single compact high torque, low speed device with the size advantages of a mechanically geared system and the reliability of a direct drive machine. This work investigates the use of MGMs for wave energy conversion through the development of a large scale magnetically decoupled...
This paper presents a research regarding a special design for a micro-wind turbine that drives a permanent magnet generator with two rotors that spin in opposite directions and recovering the energy by intermediate of brushes-rings system. The aim of this study is to develop and prove the functionality of a two rotors counter rotating permanent magnet generator by comparative results between the finite...
In this paper, a semi-analytical modeling method is applied to a Doubly Salient Permanent Magnets machine. This machine is characterized by a rotor carrying a large number of teeth. It is suitable to applications requiring high torque and low speed. A Reluctance Network is used in order to model the machine with a good compromise between accuracy and simulation duration. Moreover, the antisymmetric...
The aim of this paper is the multi-physical modeling of synchronous permanent magnet machines using reluctance network, lumped mechanical & thermal models. First, the modeling approaches are presented and validated by comparing the obtained results to those of finite element method. Second series of parametric studies are done to maximize the torque's mean value and reduce its ripple by acting...
In this paper, a proposed analytical model is introduced for acceptable optimization of an axial flux permanent magnet (AFPM) machines. Nowadays the finite-element model is one of the most powerful tool to analysis the electrical machine. However, sometimes this method can be very time-consuming for further optimization. Therefore, in this paper, a hybrid analytical model based on sub-domain algorithm...
The cogging torque in the interior permanent magnet synchronous machine(PMSM) leads to mechanical resonance, vibration, and noise, which would reduce the control accuracy of the machine. It is important to calculate the cogging torque of the interior PMSM. Up to now, there is no accurate calculation method of the cogging torque for the interior PMSM, and the accurate calculation relies on the Finite...
In this paper a novel methodology for analysis of electrical machines using finite element method is presented. At the beginning a short presentation of the investigated motor as well as the basic topologies, performance properties and characteristics is presented. Afterwards a brief presentation of the finite element method and its application in design and analysis of electrical machines is introduced...
This paper proposes a framework for the design of a coreless permanent magnet (PM) machine for a 100 kWh shaft-less high strength steel flywheel energy storage system (SHFES). The PM motor/generator is designed to meet the required specs in terms of torque-speed and power-speed characteristics given by the application. The design challenges of a motor/generator for this architecture include: the poor...
In this paper, an exact analytical method is developed to computer the air-gap magnetic field of surface-mounted permanent-magnet (SMPM) motors for valuating slotting effects accurately. In order to improve the flux density and reduce cogging torque, the genetic algorithm toolbox of Matlab is used to optimize the motor, in which the actual depth of slot, slot opening, the length of gap and pole-arc...
This paper deals with the numerical analysis of the Synchronous Reluctance Motor (SynRM) with sinusoidal rotor shape in the axial direction using the 3D Finite Element Method (FEM), and presents the airgap magnetic flux governing equation derived from Kelvin-Stoke's theorem. In the Finite Element Analysis (FEA) the airgap flux density, machines performance indexes, the torque and its ripple contents...
This paper describes design modifications of a brushed permanent magnet DC motor. Test motor is modeled using a Finite Element Method (FEM) based software. Model accuracy is investigated by comparing measurement and simulation results. Reducing material consumption in motor fabrication while the motor develops the desired torque at a higher efficiency is aimed in this paper. Modifications are done...
This paper deals with the optimization of a single side Axial Flux Permanent Magnet machine (AFPMM) designs with respect to cogging torque. Although the AFPMMs run generally at high speed and high torque, these machines may run at lower operational speed for aircraft applications. At lower operational speed, the cogging torque is an undesirable effect. Firstly, a reference AFPMM is designed with Finite...
This paper presents the effects and importance of the rotor design parameters on the performance of a permanent magnet assisted synchronous reluctance motor (PMaSynRM). At the beginning of the design, number of stator slots and rotor flux barriers are considered. Rotor design parameters such as different insulation ratios and magnet positions are investigated after choosing the number of stator slots...
This paper describes the design and prototyping process of outer rotor permanent magnet generator meant for the use in small scale wind turbines. The initial design of the machine is presented. Main issues and phenomena, affecting the generator design, such as cogging torque and its reduction possibilities, selection and demagnetization risk assessment of permanent magnets, machine losses and thermal...
Salient pole wound field synchronous machines (WFSMs) are widely used for various electric power generation, such as hydro and wind generators [1], because there is free of permanent magnet and it can be directly controlled by the DC winding.
This paper analyzes the effect of rotor bar inclination on starting torque, operating torque and operating efficiency in squirrel cage induction motor(SCIM) with finite element analysis method. The results show that the optimum inclination of rotor bar improve all the performances together. An application to the 3.4kW SCIM shows that the starting torque is increased from 17.53Nm to 17.64Nm, and the...
Nowadays the majority of applications are demanding more and more compact, cost effective and robust solutions for their electric drives. In this context permanent magnet synchronous machines are considered as a good candidate due to their high torque density. This torque density is obtained thanks to high power rare earth magnets with both high remanence and high coercive force. However, the magnets...
Interior permanent magnet synchronous motors (IPMSMs) are widely used in many applications because of their higher performance. In recent years, there has been an increasing interest in motor design technologies that can realize required specifications. Therefore, it is important to shorten the design period and generalize the design method. In the present paper, the design period is shortened using...
Many sophisticated control applications need reliable, maintenance-free and efficient drives. Brushless DC Motor is one of such machine which is now widely used due to compactness of motor and drive unit and replacing large number of conventional machines to a greater extent. The numerous benefits of Brushless DC motors are high torque to weight ratio, higher torque, less inertia and use of electronic...
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