Study of Interactive Force between Two Permanent Magnets
Abstract
A quasi Coulomb Law is intended to connect the magnetic force between
two magnets to its distance, magnetic flux intensity, and the facing
area. Both the normal and tangential force are studied with special
designed apparatus to measure the repulsive and attractive force between
the two magnets. The former study is to establish the Coulomb connection
of the magnetic forces and the latter study is for the purpose to
evaluate the magneto-electrical torque of the brushless rim driven motor
-- a significant application for the electric propulsion of next
generation electrified aviation. The measurement results show that the
relationship between magnetic force and distance is similar to Coulomb's
electrostatic law, but the attractive magnetic force is larger than the
repulsive force. The magnetic force is proportional to the integral of
magnetic flux density with the areas of the magnetic pole.