Magnetic Projection Method for Measurement and Visualization of a Magnetic Field in a Spherical Region

Abstract

It is important to understand leakage magnetic fields surrounding magnetic machines and devices for facilitation of development and evaluating the environmental effects of the magnetic field level to determine whether it conforms to the EMC guideline. The magnetic projection method is a measurement technique that can detect a leakage magnetic field by means of a simple probe. The principles of 2-D magnetic field measurement and reconstruction have been previously reported. This paper proposes the principles of a spherical magnetic projection method, and reports on an experiment carried out to observe the overall leakage magnetic field around a sample object. As a result, it is shown that the projection method can easily measure and visualize a magnetic field on a spherical surface with good accuracy.