Practical Issues in the Use of NdFeB Permanent Magnets in Maglev, Motors, Bearings, and Eddy Current Brakes

In this paper, practical design issues related to the use of high-strength neodymium-iron-boron magnets are described. These magnets have increasing utility in transportation systems (maglev, linear and rotary motors), bearings, and in eddy-current brakes. However, careful design must be done to utilize the full capabilities of these magnets.

[1]  Z. Zhu,et al.  Halbach permanent magnet machines and applications: a review , 2001 .

[2]  G. Umana,et al.  Elevated temperature behavior of sintered Nd-Fe-B type magnets , 1988 .

[3]  J. Ofori-Tenkorrang,et al.  A comparative analysis of torque production in Halbach and conventional surface-mounted permanent-magnet synchronous motors , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[4]  S. R. Trout,et al.  Effective use of neodymium iron boron magnets, case studies , 1999, Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.99CH37035).

[5]  R. Parker Advances in Permanent Magnetism , 1990 .

[6]  R. F. Post,et al.  A null-current electro-dynamic levitation system , 2002 .

[7]  Guidelines on limits of exposure to static magnetic fields. , 2009, Health physics.

[8]  J. C. Mallinson,et al.  Damped gyromagnetic switching , 2000 .

[9]  Z.J.J. Stekly Large scale applications of permanent magnets , 2000, IEEE Transactions on Applied Superconductivity.

[10]  E. Furlani Permanent Magnet and Electromechanical Devices: Materials, Analysis, and Applications , 2001 .

[11]  J. Mallinson One-sided fluxes -- A magnetic curiosity? , 1973 .

[12]  Lester R. Moskowitz,et al.  Permanent magnet design and application handbook , 1976 .

[13]  K. Halbach Design of permanent multipole magnets with oriented rare earth cobalt material , 1980 .

[14]  C. N. R. Rao Concise encyclopedia of magnetic and superconducting materials, 1992, (ed.) Jan Evetts , 1993 .

[15]  S. Gurol,et al.  Overview of the general atomics urban Maglev technology development program , 2004, ASME/IEEE Joint Rail Conference, 2004. Proceedings of the 2004.

[16]  Marc T. Thompson,et al.  Braking apparatus eddy current. , 2001 .

[17]  K. Miyata,et al.  Simulations and experiments on eddy current in Nd-Fe-B magnets , 2005, INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005..

[18]  Q. Han,et al.  Four- and eight-piece Halbach array analysis and geometry optimisation for maglev , 2005 .

[19]  P. Straka,et al.  Methods of Assembling Large Magnetic Blocks From NdFeB Magnets With a High Value of $({\rm BH})_{\max}$ and Their Influence on the Magnetic Induction Reached in an Air Gap of a Magnetic Circuit , 2008, IEEE Transactions on Magnetics.

[20]  Tony Morcos The Straight Attraction PART ONE , 2000 .

[21]  P. Campbell Permanent Magnet Materials and their Application: Applications , 1994 .

[22]  Tomy Sebastian,et al.  Temperature effects on torque production and efficiency of PM motors using NdFeB magnets , 1993, Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting.

[23]  M. E. Williams,et al.  Design and analysis framework for linear permanent magnet machines , 1994, Proceedings of 1994 IEEE Industry Applications Society Annual Meeting.

[24]  Markus Zahn,et al.  Electromagnetic Field Theory: A Problem Solving Approach , 2003 .

[25]  K. Miyata,et al.  Simulations and experiments on eddy current in Nd-Fe-B magnet , 2005, IEEE Transactions on Magnetics.

[26]  D. Ryutov,et al.  The Inductrack: a simpler approach to magnetic levitation , 2000, IEEE Transactions on Applied Superconductivity.

[27]  Y. Kaneko Highest performance of Nd-Fe-B magnet over 55 MGOe , 2000 .

[28]  C. Chree,et al.  Transactions of the Cambridge Philosophical Society , 1889 .

[29]  P. Mitchell Corrosion protection of NdFeB magnets , 1990, International Conference on Magnetics.

[30]  Husam Gurol,et al.  Low Speed Maglev Technology Development Program [Final Report] , 2002 .

[31]  M. Kumada,et al.  Development of 4 tesla permanent magnet , 2001, PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268).

[32]  Seok-Myeong Jang,et al.  The characteristics analysis of eddy current brake system using the linear Halbach array , 2002 .

[33]  Sung Ho Lee,et al.  Design and analysis of three types for permanent magnet linear synchronous machine , 2003, Sixth International Conference on Electrical Machines and Systems, 2003. ICEMS 2003..

[34]  S. Earnshaw On the Nature of the Molecular Forces which Regulate the Constitution of the Luminiferous Ether , .

[35]  Marc T. Thompson High temperature superconducting magnetic suspension for Maglev , 1997 .

[36]  H. A. Shute,et al.  One-sided fluxes in planar, cylindrical, and spherical magnetized structures , 2000 .

[37]  Marc T. Thompson Intuitive Analog Circuit Design , 2006 .

[38]  J.F. Hoburg Modeling maglev passenger compartment static magnetic fields from linear Halbach permanent-magnet arrays , 2004, IEEE Transactions on Magnetics.

[39]  Klaus Halbach,et al.  Physical and optical properties of rare earth cobalt magnets , 1980 .