3-D Reactance Calculation of Air-Core Coils with Magnetic Screening

Abstract

In the previous paper5 a method for computing 3-D magnetic field of aircore coils has been proposed. These coils may be simulated by means of the four spatial solids (rectangular prisms) situated in the unbounded space as shown in Fig.l. The coils operating as air-core reactors may be suitably screened (partially or completely) with sheet iron. For other reasons they may also be located nearby the steel solids which may be considered as the magnetic screens as well. A magnetic screen is the more effective the less saturated than the sheet iron is (µs» µO). In the present paper 3-D field distribution as well as the reactance of an air-core coil are calculated having regard to the fact that nonsaturated magnetic screens can be located in a different way. In this connection: this paper may be considered as a further development of the method described in the paper5.