Opis: This article proposes a methodology for the design of double-sided coreless axial flux permanent magnet synchronous machines, which is based on a developed model for calculating the axial component of the magnetic flux density in the middle of the distance between opposite permanent magnets, which also represents the middle of the stator. Values for different geometric parameters represent the input data for the mathematical model in explicit form. The input data are calculated by using a simplified finite element method (FEM), which means that calculations of simplified 3D models are performed. The simplified model consists of two rotor disks with surfacemounted permanent magnets and air between them, instead of stator windings. Such a simplification is possible due to similar values of permeability of the air and copper. For each simplified model of the machine the axial component of the magnetic flux density is analyzed along a line passing through the center of opposite permanent magnets and both rotor disks. Values at the middle of the distance between the opposite permanent magnets are the lowest and are therefore selected for the input data at different stator, rotor disks and permanent magnets (PM) thicknesses. Such input data enable the model to consider the nonlinearity of materials. Ključne besede:axial flux, analysis, coreless, development, design, explicit form, finite element method, mathematical models, permanent magnet, synchronous Objavljeno v DKUM: 01.12.2023; Ogledov: 415; Prenosov: 14 Celotno besedilo (2,70 MB) Gradivo ima več datotek! Več...

Opis: Axial flux permanent magnet generators (AFPMG) are used in many high torque applications, including wind generators. There are many design methodologies for AFPMG that are connected to simple design equations used for preliminary design. Analytical methods offer a fast preview of torque production of the designed machine with a certain degree of accuracy. The finite element method (FEM) is a more accurate numerical method than other methods and requires a great deal of time for simulations in the design procedure. This article presents a method for the design and analysis of an axial flux permanent magnet generator by using approximation polynomials. Ključne besede:Axial flux permanent magnet generator, approximation method, magnetic flux, magnetic flux density Objavljeno v DKUM: 15.11.2023; Ogledov: 383; Prenosov: 4 Celotno besedilo (1,04 MB) Gradivo ima več datotek! Več...

Opis: The article deals with numerical analysis of a double sided coreless axial flux permanent magnet machine with two rotor disks and a coreless stator. Coreless stator represents copper windings which are held together by epoxy raisin, therefore a special focus has to be given to the stator temperature. In this article a numerical analysis is presented, which is based on the copper losses, namely the I2R product, where the resistance of the copper windings was both calculated as well as measured in the prototype machine. Ključne besede:axial flux, CFD, coreless, permanent magnet, temperature distribution Objavljeno v DKUM: 27.10.2023; Ogledov: 293; Prenosov: 13 Celotno besedilo (1,23 MB) Gradivo ima več datotek! Več...

Opis: This paper presents the method for determining losses and efficiency of small axial flux permanent magnet synchronous motor with surface mounted permanent magnets and double external rotor by using measurements. Losses and efficiency are calculated by using measured electrical input power and mechanical output power. The characteristics obtained by the measurements are in good agreement with analytically calculated results and the results obtained by the finite element method. Ključne besede:losses, efficiency, axial flux permanent magnet synchronous motor, measurement Objavljeno v DKUM: 10.07.2015; Ogledov: 2128; Prenosov: 89 Povezava na celotno besedilo

Opis: This paper presents the analysis of rotor disc thickness in coreless stator axial flux permanent magnet synchronous machine (AFPMSM) with double external rotor and internal stator. An important advantage of these types of machines is that rotors can be implemented by using massive ordinary construction steel. Due to the high possibility of large weight of AFPMSMs there is a tendency to implement as lightweight design as possible. In this work, the influence of rotor disk thickness on AFPMSM characteristics is investigated. Ključne besede:axial flux, permanent magnet, synchronous machine, rotor thickness Objavljeno v DKUM: 10.07.2015; Ogledov: 3075; Prenosov: 108 Povezava na celotno besedilo