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This paper presents the design and optimization of a high-efficiency permanent magnet synchronous alternator with the desired output power of 2 kW at 6 krpm applying to the truck power system. This kind of alternator requires low output voltage and high current. In order to effectively increase the overload power handing capability and efficiency of the designed alternator, the low torque angle is...
A comparative study of a 5 phase PMSG with classical distributed winding and one with fractional slot winding is presented in this paper. Finite element analysis has been used for both models in order to estimate there performances. Two initial conditions have been considered: keeping the same volume of permanent magnet and the same total slots section for stator winding. The main goal was to design...
The hybrid flux PMSM includes both axial flux and radial flux, so its design method is different from the traditional cylindrical permanent magnet synchronous motor. In this paper, based on the analysis of the structure and operation principle of the hybrid flux motor, the design principle of the motor is given. The authors study the effects of slotting, permanent magnet thickness, and pole-slot match...
An electric machine with permanent magnets on both its rotor and stator is proposed and studied. The key idea is to using the bi-directional flux modulation effect to realize a structure with more rotor poles and less stator poles. Compared with the conventional machines with single-sided permanent magnet excitation, the proposed machine has more flexible pole-slot design when the pole number is large...
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...
In this paper, the effect of variation of angle between the magnetic field axes of armature field and PM rotor field on armature reaction and performance of a Hybrid Permanent Magnet Induction Machine (PMIM) is presented. The variation of resultant air gap flux density and torque-slip characteristics of the machine for different angle between the magnetic field axes were obtained using Finite Element...
This paper presents the magnetic field analysis of a dual-rotor type Hybrid Permanent Magnet Induction Machine (PMIM) using Finite Element Method (FEM) based software. Various possible topologies of the machine are discussed and analyzed using Ansys Maxwell software and then compared with a conventional Squirrel Cage Induction Machine (SCIM). The machine is in its preliminary stage of development...
In this paper, a new thin yoke modular linear flux-switching permanent magnet (TYMLFSPM) machine with fault-tolerant capability is proposed. The analysis for the proposed TYMLFSPM machine is carried out by the finite-element method. The ratio of mover pole pitch to stator pole pitch is optimized to increase the thrust force and thrust force density.
A novel structure of dual permanent magnet machine with PMs on both stator and rotor is presented as an effective option for high torque density direct-driven applications. The novel machine has PMs on both sides of rotor and stator. The PMs on the stator are designed as cylinder and can be rotated by an external driven system. Field can be regulated by the rotation of stator PMs. The structure and...
In this paper, design optimization and fabrication of a prototype permanent magnet brushless generator for a direct drive wind turbine has been considered. The main challenge in design of a low speed permanent magnet brushless generator is pulsating torque phenomenon due to cogging torque and electromagnetic torque ripple which can led to noise and vibration. In order to reduce pulsating torque components,...
The paper considers a subexciter with permanent magnets for a synchronous generator. The machine has four pairs of poles; its synchronous rotation speed is 750 rpm. The paper describes features of definition of magnetic materials with the ANSYS Maxwell, a circuit creation process that simulates operation of the machine under active load. Different graphics are also presented: phase voltages of the...
The foremost requirement of todays electric vehicle is comfort and power. The challenge that todays electric motor designer face is to have a large traction torque at low speed and wide constant power speed range. Flux switching machine has magnets parallel to stator winding that avoids the risk of demagnetisation because of better thermal cooling. Efficiency map of such machines can be determined...
Research and development on flux switching machines (FSMs) getting popular due to their several definite advantages of high torque and power densities, constant power over a wide speed range, higher efficiency and robust rotor structure inherits combined advantages of permanent magnet synchronous motor (PMSM) and switched-reluctance motor (SRM). There are many developed and novel design of FSMs for...
A novel structure of VPM machine is presented as an effective option for high torque density direct-driven applications. The novel machine has PMs on both sides of rotor and stator. The PMs on the stator are designed as cylinder and can be rotated by an external driven system. Field can be regulated by the rotation of stator PMs. The structure and operation principle are introduced and the performance...
In recent years, permanent magnet (PM) machines have received increasing attention for direct-drive applications due to its high efficiency and improved power density performances [1]. In [2], a linear stator permanent magnet vernier (LSPMV) machine is proposed, in which the stator consists of an iron core wound with distributed windings and PMs mounted on the surface of the stator teeth, while the...
This paper presents an analysis of the influence that variations of the geometrical parameters of a Permanent Magnet Synchronous Generator (PMSG) have on the values of the cogging torque and induced electromotive force (emf). The following parameters were varied for this study: stator teeth width, stator slots isthmus width, length of permanent magnets pole arc and rotor yoke width. The effects of...
Low power induction machines usually have the drawback of low efficiency and power factor. Line-start permanent magnet synchronous machines represent a good candidate at replacing them in constant speed applications. This paper presents the results obtained using a finite element analysis software package. The study aims to present the load-start performances and the generator capabilities of a 3...
In terms of torque capability, power factor and efficiency, synchronous reluctance machines with high-anisotropy rotors represent an alternative to conventional induction machines. In particular, they have very robust rotors and can therefore operate at constant power in a wider field-weakening range. The paper discusses a comparison of the various machine concepts using an identical machine geometry...
This paper describes an optimization of the stator geometry in a way that the torque ripple at particular load is reduced. The principle applied to the torque ripple reduction is based on the synchronous inductance variation suppression, caused by the non-linear steel saturation, which might be significant even in permanent magnet synchronous motors (PMSMs) with rotor surface permanent magnets. The...
In the following paper, an analytical approach for the calculation of the the induced emf in windings of electrical machines is provided. This method uses the complex Fourier series that describe the stator winding function and the magnetic flux density distribution in the air gap that is caused by the rotor permanent magnets. By using a special case of the Parseval's theorem, the induced emf can...
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