Design of hish coercivity permanent magnets, exposed to external fields

This paper describes a method for designing permanent magnets that are to be exposed to magnetic fields from external sources. Under such conditions, a widely-used procedure for magnet design cannot be relied upon to give accurate results. It it shown that this procedure does not conform generally to the basic equations of magnetism and, therefore, can be used only under limited circumstances. Engineers, not specialized in magnetics, are generally unware of these limitations.