A Novel Combined [Formula Omitted] Sensing Coil in Three-Dimensional Magnetic Properties Testing System

A novel sensing structure with combined [Formula Omitted] (magnetic flux density) and [Formula Omitted] (magnetic field strength) sensing coils is used in three-dimensional (3-D) magnetic properties testing system with cubic specimen. In order to accurately calculate and analyze the 3-D magnetic properties from experiment, comprehensive calibration and compensation of the sensing structure must be systematically fulfilled. This paper presents the structure and calibration of the novel surface [Formula Omitted] sensing coils and the accurate expression of [Formula Omitted] and [Formula Omitted] calculation by means of coefficient matrix of the sensing coils. Based on the novel sensing coils and accurate coefficients, rotational magnetic properties of a soft magnetic composite material specimen have been measured and analyzed.