Design Analysis of High-Speed Axial-Flux Generator

Abstract

Problem Statement: Axial flux permanent magnet machines are regarded as compact high efficiency generators for micro-turbines employed in the distributed power generation systems. Highspeed rotor of the generator causes some designing and modeling problems. Sensitivity analysis tasks of the machine parameters are difficult and completely different in comparison with the problems associated with conventional machines. Approach: This article presents a modeling procedure with some details for performance predictions of High-Speed Axial Flux Generator (HSAFG). The FEM results are employed to validate the proposed model. Proper values of inner diameter to outer diameter ratio, plus back iron thickness of two rotor discs located in two ends are serious design problem for a HSAFG. Results: Impacts of these two parameters on the performance characteristics of a HSAFG are investigated in this paper. Their optimum values are determined for the machine by somewhat precise considerations of the output voltage and efficiency. Conclusions/Recommendations: It has been found out that the optimum performance of HSAFG regarding the voltage and efficiency is achieved by the value of inner to outer diameter ratio sited between 0.5-0.65. Moreover, the thickness of the rotor back iron can be designed by trial method to produce sufficient air gap flux and resultant terminal voltage. Adding extra back iron would just increase the rotor inertia with no benefit.

Considerations for starting combustion engines with AC machines

“…Both authors [23,27] comment that a synchronous machine is more efficient than an induction one due to better torque-to-mass ratio and more convenient as the stator doesn't need to be energized to generate. In particular, the axial flux PM synchronous machine has more torque-to-mass ratio [28,29].…”

Reduction of Torque Ripples in Multi-Stack Slotless Axial Flux Machine by Using Right Angled Trapezoidal Permanent Magnet

“…Where io k and rpm n shows the inner to outer diameter ratio and rotor speed in rpm, respectively. Further the output torque can be determined as in (7).…”

“…It can be clearly seen from ( 7) and (8), the power and torque are directly related to g B , e A and ps NN . From (7), the outer diameter is given as in (9). (1 )…”

“…Permanent magnet machines have a wide range of use in the electric vehicle and aerospace industries all around the world providing the exceptional performances such as high reliability, high-power density, and high efficiency [1][2][3][4]. Axial flux permanent magnet (AFPM) machines are installed for various applications because of their benefits [5][6][7][8][9]. Two main applications of AFPM machines are for renewable energy-based production of electricity [10,11] as well as the application for electric and hybrid vehicles [6,12].…”

Optimized High Frequency Signal Injection Based Permanent Magnet Synchronous Motor Rotor Position Estimation Applied to Washing Machines

“…In order to overcome these limits and insure required torque-speed capabilities and robust operating of washing machines, based on PMSM drives, especially in particular conditions such as very low speeds, standstill, open loop startup and load variation, various sensorless Field Oriented Control techniques have been proposed and developed (Haque et al, 2003;Paramasivam and Arumugam, 2004;Perassi et al, 2005;Taniguchi et al, 2007;Balazovic and Filka, 2008;Sadeghierad et al, 2008;Chi et al, 2009;Feraga et al, 2009;Belie et al, 2010;Vogelsberger et al, 2010;Asseu et al, 2011).…”