Calculation of frequency responses of electromagnetic levitation magnets
Abstract
The paper presents a mathematical model for calculating eddy currents in electromagnets used to levitate high speed ground transportation vehicles. Eddy currents caused by varying coil currents and air gaps complicate calculation of the force and current associated with the electromagnets. A method is presented for calculating the force and current for infinitely small harmonic voltage and gap variations. To aid in the solution of this linear problem, a twodimensional model of the magnet is created; this model problem is solved by a simple Fourier series expansion. Further development of the model is explained. Good results for the magnet's force variation and power consumption are obtained if voltage and gap variation values are not excessive.
 Publication:

IEEE Transactions on Magnetics
 Pub Date:
 September 1977
 DOI:
 10.1109/TMAG.1977.1059566
 Bibcode:
 1977ITM....13.1412B
 Keywords:

 Electromagnets;
 Frequency Response;
 Magnetic Levitation Vehicles;
 Mathematical Models;
 Two Dimensional Models;
 Urban Transportation;
 VoltAmpere Characteristics;
 Electronics and Electrical Engineering