Patent ID: 6538239
Filing Date: 2003-03-25
Classification: H05B

Abstract:
A magnetic heating device comprising three electrical coils, each coil being wound around a respective magnetic yoke having a gap therein, the three yokes being arranged such that the gaps are adjacent to each other or coincident, an article to be heated being located, in use, in the gaps in the three yokes, so as to direct the magnetic field generated in each yoke by its respective coil through the article, each coil being connected to a respective different phase of a three phase low frequency alternating electrical supply, and one of the coils being wound in the opposite direction to the other two coils, characterised in that the three yokes are arranged at 120Â° to each other with the axis through each gap intersecting, the three yokes share a common closed loop in the form of a hexagon with each of the three yokes having components extending from respective sides thereof.