Autors: Bachev, I. E., Lazarov, V. D., Zarkov, Z. J.
Title: Analysis of the Influence of NdFeB Permanent Magnet’s Type and Volume on the Characteristics of a PM Claw-pole Alternator
Keywords: claw-pole alternator, equivalent magnetic circuit, NdFeB permanent magnet

Abstract: This paper proposes an analytical method to calculate the magnetic flux in the air gap of a claw-pole alternator, created by a NdFeB permanent magnet. The method can also be used to calculate the dimensions of a permanent magnet that will create a desired voltage in the machine. The possibility to obtain a certain value of the machine voltage with lower volume of rare earth material will lead to a decrease in the cost of the final product. The need for such a method is grounded on the complex geometry of this type of electrical machines, which would require a time consuming 3D FEM analysis. Knowing the air-gap magnetic flux of the machine permits the right choice of permanent magnet type and volume, which facilitates the designing phase of the alternator. The influence of the permanent magnet’s cross section and length on the magnetic flux in the air-gap of the alternator is analyzed. A comparison between the electromotive forces created by a PM with different grades is presented.


  1. Whaley D.M., W. L. Soong, N. Ertugrul, 2004, Extracting more power from the lundell car alternator, Australia, 26-29 September 2004, <Brisbane>, Australasian Universities Power Engineering Conference (AUPEC 2004)
  2. Marinov M., M. Streblau, T. Penev, B. Aprahamian, 2015, Study of the electromagnetic characteristics of synchronous generator by replacement of excitation winding with permanent magnets, Varna, Bulgaria, 2-3 October 2015, <Varna>, Fourteenth International Conference on Electrical Machines, Drives and Power Systems - ELMA 2015
  3. Jurca F., C. Marţiş, C. Oprea and D. Fodorean, 2011, Claw-pole machine design and tests for small scale direct driven applications, Ischia, 2011, <Ischia>, 2011 International Conference on Clean Electrical Power (ICCEP)


2021 17th Conference on Electrical Machines, Drives and Power Systems, ELMA 2021, pp. 1-4, 2021, Bulgaria, DOI 10.1109/ELMA52514.2021.9502990

Copyright IEEEXplore Digital Library

Full text of the publication

Вид: публикация в международен форум, публикация в реферирано издание, индексирана в Scopus