Design of Doubly Salient Permanent Magnet Generator for Output Power Enhancement using Structural Modification (original) (raw)
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Energies
The doubly salient permanent magnet (DSPM) machines are very attractive for low-speed power generation. In this work, we propose a design technique to improve the output power of the DSPM generator by an adjustment of pole configuration. The number of stator and rotor poles, split ratio, as well as the stator pole arc of the generator, were proposedly adjusted and optimized. The output characteristics of the generator including the magnetic flux linkage, electromotive force, harmonic, cogging torque, electromagnetic torque, output voltage and output power were analyzed through finite element analysis. The symmetrical magnetic field distribution of all generators was firstly verified. Then, the results indicated that this particular generator was optimized at 18 stator poles and 12 rotor poles, while the split ratio and the stator pole arc should be set as 0.78 and 6.15 degrees, respectively. The proposed optimal generator could provide a significant improvement in the output voltage...
Refine design parameters for permanent magnet shape modification of the direct-drive generator
International Journal of Power Electronics and Drive Systems (IJPEDS), 2021
The high cost associated with operation has promoted the progress of wave energy conversion and has higher power output and larger size. However, many countries are bordered by the sea, and the possible area for using wave energy is very small which can generate peak power generation systems with a power output of less than 100 W. The purpose of this article is to introduce the refined parameters of new design of the permanent magnet shape of with tubular longitudinal direct-drive generator. Three designs proposed, which different shapes of permanent magnets with same topology. The parameter optimization process was analysed using finite element analysis to determine the best main parameters of the design, namely the length of the stator length to translation ratio (πΏπ /πΏπ), pitch ratio (πππ/ππ.), and split ratio (π π/π π). To evaluate design performance, electrical losses from the proposed design were also evaluated. The optimization results show these designs generator can produce 100 W of peak level output power with higher efficiency at rated current and optimal load.
Energies, 2021
Wind turbine (WT) technology becomes more and more important due to the serious environmental and energy issues. The toothed poles outer rotor doubly salient permanent magnet (DSPM) generator with simple and durable design, high torque and high-power density has a great prospect in wind turbines application. The large diameter makes the construction of such a machine more convenient due to the installation of the turbine blades directly to the outer rotor generator surface. Nevertheless, the size of the generator must be increased to provide larger output power. This increases the generatorβs mass. Thus, larger massive DSPM generators are undesirable in wind turbine design. In this paper, an optimization design procedure of the outer rotor doubly salient permanent magnet generator ORDSPMG is proposed for 10 kW WT application. The reduction of the generator weight is demonstrated and proofed. The considered machine version is characterized by having the same effective axial length an...
Assessment of power generation capability of doubly-salient PM generator
IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 1999
In thk paper, the characterization of the power production capability of the DSPM generator under loaded conditions will be fully explored by using relevant power electronic circuit implementations. The ac output of the DSPM generator can easily be rectified to power a dc load. In certain applications, the requirement is for constant dc rectifier current, while in some applications dc voltage should be constant. The required rectification can be done by using a variety of power electronics circuits. A diode bridge rectifier with constant current and constant voltage output, and a PWM boost controller with a hysteresis current controller are the implementations of interest. In the case of an actively switched converter, semiconductor devices are used to shape the current, and hence provide a controlled power transfer.
Modeling and Analysis of Double Stator Slotted Rotor Permanent Magnet Generator
Energies, 2017
This paper discusses the modeling and analysis of three phase double stator slotted rotor permanent magnet generator (DSSR-PMG). The use of double stator topology through the double magnetic circuit helps to maximize the usage of flux linkage in the yoke structure of the single stator topology. The analytical computation is done using Permeance Analysis Method (PAM). Finite Element Analysis (FEA) is used for numerical verifications and to verify the design structure a prototype laboratory is performed. The analysis is done with various loading conditions to derive the electromagnetic torque, output power and efficiency for the proposed structure. The analytical, numerical and experimental results from the analysis are found to be in good agreement. The maximum power developed by this generator at rated speed of 2000 rpm is of 1 kW with the operational efficiency of 75%. A rectifier bridge circuit is used to make the generated voltage a storage capable constant voltage to make it suitable for mobile applications (such as Direct Current DC generator). The proposed generator structure is highly recommended for applications such as micro-hydro and small renewable plants.
Mechatronics, Electrical Power, and Vehicular Technology, 2012
Analytical and numerical studies of the deflection in the structure of 10 kW low speed permanent magnet generator (PMG) have been discussed in this paper. This study is intended to prevent failure of the structure when the prototype is made. Numerical analysis was performed with the finite-element method (FEM). Flux density, weight and temperature of the components are the required input parameters. Deflection observed were the movements of the two main rotor components, namely the rim and shaft, where the maximum deflection allowed at the air gap between rotor and stator should be between 10% to 20% of the air gap clearance or 0.1000 mm to 0.2000 mm. Base on the analysis, total deflection of the analytic calculation was 0.0553 mm, and numerical simulation was 0.0314 mm. Both values were in the acceptable level because it was still below the maximum allowed deflection. These results indicate that the structure of a permanent magnet generator (rim and shaft) can be used safely.
International Journal of Emerging Electric Power Systems, 2014
The improvement of efficiency, total harmonic distortion (THD), and cogging torque in outer rotor permanent magnet synchronous generator (PMSG) is the main concern in this paper. The paper focuses on handling the parameters of design, i.e. the geometry of the stator, the polar arc percentage, the air gap, the skew angle in rotor poles, the pole length, and the core steel class. The modification of geometric parameters related to the statorβs inductance is analyzed. Seventy-six cases are simulated, and results provide useful information for designing this type of machines. The study is carried out in a 5 kW PMSG.
A Review of Design and Analysis of Small Scale Permanent Magnet Wind Generator
it is not my paper Renewable energy sources, especially wind turbine generators, are considered as important generation alternatives in electric power systems because they have no exhausted nature and not harmful environmental effects. Permanent magnet generator has a good prospect in small scale wind turbine application. Many types of generator concepts have been proposed and used, but most of the low speed application consist Permanent magnet generator. As compare to conventional electrically excited generators, PMG have many advantages, so it attracted towards interest of research. The purpose of this paper is to review Permanent magnet generator configuration, design methodology, design optimization, and analysis of permanent magnet generator. Different Machine configurations proposed in literature are also discussed for suitability to small scale wind turbine application.
Frontiers in Energy Research, 2021
This paper introduces the pole ratio adjustment technique to improve the torque characteristics of the doubly salient permanent magnetic machine (DSPM). The electrical characteristics of the machine, namely the magnetic field distribution, flux linkage, back-electromotive force (EMF), and cogging torque, were obtained under open-circuit conditions. The electromagnetic torque and ripple torque were examined under the loaded condition. The simulations, based on the 2D-finite element method, show that the optimal pole ratio for the DSPM structure is with 18 stator teeth and 15 rotor poles. This optimal structure achieves a larger phase back-EMF than the conventional structure, as well as had a better magnetic flux path with a reasonable cogging torque. The on-load test also confirmes that the proposed optimal structure can produce a significantly higher electromagnetic torque than the conventional machine while maintaining a satisfactory torque ripple. Furthermore, an experimental prot...
Low speed doubly salient permanent magnet generator with passive rotor for a tidal current turbine
2013 International Conference on Renewable Energy Research and Applications (ICRERA), 2013
This paper presents a low speed permanent magnet generator that can be associated with a tidal turbine. This structure has a passive rotor which leads to a simple and robust structural solution. The principle of operation and an electromecanical model of this machine are presented. The use of this model is based on the accurate calculation of inductances in operating condition including saturation regime. An original method for determining these inductances is then presented. This original method allows predicting more precisely the behavior of the generator