Affiliations: [a] Departamento de Materiales, Universidad Autonoma
Metropolitana, Av. San Pablo 180, Col. Reynosa Tamaulipas, CP 02200, Mexico
City, D.F., México
Correspondence:
[*]
Address for correspondence: Alfonso No. 97, Col. Alamos,
Delegacion Benito Juarez, CP 03400, Mexico city, D. F., México. Tel.: +52
5555 192090; E-mail: ECarrilloBath@aol.com
Abstract: A dimensionless analysis of eddy current distribution on massive
conductors was undertaken, using configurations for two excitation sources
co-axial to a cylindrical induction device: a solenoidal type, as found in most
coreless furnaces, and an axial type, similar to that used in induction motors.
The mathematical model is based on a one-dimension solution of the
electromagnetic diffusion equation in an infinitely long cylinder utilizing the
Newton shooting method. The simulated electromagnetic performance is compared
for both configurations for a minimum in either the operational frequency or
the size of a given induction heating system. The theoretical results show that
workpieces powered by single-phase axial winding, featuring one pair of
magnetic poles, release ohmic losses equivalent to the solenoidal counterpart
using half of its frequency or the square root of its radius.
