Title :
Mixed-Grade Pole Design for permanent magnet synchronous machines
Author :
Ruoho, Sami ; Arkkio, Antero
Author_Institution :
Lab. of Electromech., Helsinki Univ. of Technol., Helsinki
Abstract :
This paper introduces a design idea of a new kind of pole structure with different magnet grades used in one pole: "the mixed-grade pole design". This structure offers improved demagnetization protection and also brings potential cost savings by optimizing the use of dysprosium in Nd-Fe-B- permanent magnet material. A new demagnetization model with an exponential function is also introduced. The new design idea is compared with a traditional one-grade design by using finite element method electromagnetic simulations combined with the demagnetization model. Finally, the benefits of the new pole structure are discussed.
Keywords :
finite element analysis; permanent magnet motors; synchronous motors; finite element method; mixed-grade pole design; permanent magnet material; permanent magnet synchronous machines; Coercive force; Demagnetization; Laboratories; Magnetic materials; Magnetization; Manufacturing; Paper technology; Permanent magnet machines; Permanent magnets; Remanence; Demagnetization; finite-element methods; magnetic field modeling; mixed-grade pole; permanent magnets;
Conference_Titel :
Electrical Machines and Power Electronics, 2007. ACEMP '07. International Aegean Conference on
Conference_Location :
Bodrum
Print_ISBN :
978-1-4244-0890-0
Electronic_ISBN :
978-1-4244-0891-7
DOI :
10.1109/ACEMP.2007.4510542
