According to modern magnetic theory a magnet motor would soon run down as the energy stored in the magnetic field would be used up driving the flywheel arrangement. If the magnetic field of a magnet is actually part of the magnetic field of the earth, then there can be no depletion. Page 2 Magnetic energy is not created. It is either stored in the permanent magnet or in the surrounding space. It can not be used up or destroyed.
Many magnetic materials are available.
Knowledge and careful analysis is needed to make the right choice. Only when there is a change in the balance of internal energies is energy released or absorbed by the permanent magnet. In addition to design parameters, physical characteristics and environment must be carefully considered in the application of permanent magnets. In development of properties, in design analysis, and in quality control of a particular permanent magnet, component-measurements are vital. Changing the state of magnetization is an important factor in working with todays high coercive force permanent magnet materials.