Development of low translator mass linear Vernier machine for wave energy power take off

Koņuhova

Latvian Journal of Physics and Technical Sciences

et al. 2022

The article introduces two new designs of flux switching permanent magnet alternators with a radial and an axial arrangement of the inductor relative to the magnetic flux switch. The study presents the results of 3D magnetic flux modelling along with the outcomes of physical experiments. In the course of laboratory experiments, the results of theoretical estimations are compared with actual physical performance parameters. The results are presented in the form of power and output voltage curves in relation to the frequency and load current. The study proposes the practical application of the alternators based on the magnetic flux switching principle in the development of a bicycle generator. Laboratory test models are made of a laminated steel using a waste-free technology.

Section: Introductionmentioning

confidence: 99%

Magnetic Flux Switching Type Permanent Magnet Generator for Bicycles: Modelling and an Experimental Study

Koņuhova

Latvian Journal of Physics and Technical Sciences

et al. 2022

“…More recently, new forms of the vernier hybrid permanent-magnet machines [3], [4], which are based on the principle of variable-reluctance have come in sight. Along with simple design, these machines offer a compact direct drive solution for low-speed and low-power applications.…”

Section: Introductionmentioning

confidence: 99%

Axial Flux Switching Permanent Magnet Alternator with External Magnetic Cores

Koņuhova

Latvian Journal of Physics and Technical Sciences

et al. 2022

The article introduces the results of studying the magnetic field distribution in the alternator inductor with an axial arrangement of open magnetic cores (OMC) and external closure of magnetic fluxes. The study compares the efficiency of using magnetic fluxes from permanent magnets (PM) on the example of two model variants of inductors with OMC developed by the authors. The analysis of the density distribution of magnetic fluxes in OMC was carried out by 3D modelling of the magnetic field using EMWorks software. It has been shown that such generators can be manufactured using a waste-free technology for strip of OMC. This technology significantly reduces the production costs of OMC. By modelling the distribution of magnetic fluxes in the OMC of the inductor, the results of experimental studies and analysis of the created device show that the capacity of generator can be varied by changing its dimensions and the number of the toggle switches on the rotor. This allows the alternator to be adapted to the load requirements – power banks and bicycle electronics.

“…Linear generator is widely used for DD-WEC and the main objective of the researchers is to increase the power density of linear generator [7]. High power density can be achieved by using variable reluctance linear generators [8]. Variable reluctance permanent magnet linear generators (VR-PMLGs) share the basic principle of linking flux between sets of permanent magnets (PMs) and salient teeth.…”

Section: Introductionmentioning

confidence: 99%

“…However, complex 3-D flux path and translator mounted PMs lead to problems in linear applications. The main demerits are low power factor and complex manufacturing [8].…”

Section: Introductionmentioning

confidence: 99%

A Stator-PM Transverse Flux Permanent Magnet Linear Generator for Direct Drive Wave Energy Converter

et al. 2021

Transverse flux permanent magnet linear generator (TF-PMLG) is widely used in direct drive wave energy converter (DD-WEC) because of its high power density. Traditional transverse flux machine (TFM) is designed and built in form of translator-PM. But translator-PM configuration needs a large amount of PM and the cost is high in long stroke application, like DD-WEC. Recently, the stator-PM linear machines have gained more attention for reducing the PM volume and improving the generator performances under low-speed conditions. In this paper, a novel stator-PM TF-PMLG for DD-WEC has been proposed. The fundamental configuration and operation principle of the generator are illustrated. Then, the expressions of the back EMF and the electromagnetic thrust are derived by magnetic circuit analysis. Main dimension parameters, such as PM thickness, central angle of the outer stator shoe and pole pitch are determined and optimized based on finite element analysis (FEA). This topology has advantages of low PM consumption and high power density, and is a suitable candidate for long stroke applications, like DD-WEC, in which a high power per PM volume is usually needed to reduce the amount of permanent magnet and ensure high power density.