Influence of Soft Magnetic Material on the Force of Attraction and Repulsion between Magnets

抄録

Many researchers and engineers to date have been researching applications for permanent magnets. Examples of a device in line with that research are a vibration sensor and a limit switch. These devices use a repulsion magnetic field with permanent magnets and this magnetic force is an important parameter in permanent magnets. When the poles between the two magnets are the same, this force is repulsive and when they are opposite, this force is attractive. If was confirmed in recent years that when two magnets are placed close together and arranged facing each other with a magnetic material on one of their sides, the repulsion force changes to an attractive force at the boundary point. The purpose of this paper is to measure the resultant force when the two magnets are placed close to one another under the above mentioned conditions. We also compared measured values to calculated values, and considered the validity of FEM analysis about calculation of magnetic force.