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Temperature Dependence of Resistivity of Sintered Rare-Earth Permanent-Magnet Materials

We studied the resistivity of rare-earth permanent-magnet materials over the temperature range -40°C to +150°C. We investigated three different materials from four manufacturers, including Nd2 Fe14 B, SmCo5 , and Sm2 Co17 , and measured their resistivities and temperature coefficients. We found that rare-earth permanent-magnet materials show an anisotropic resistivity behavior. In fact, the resistivity anisotropy causes larger resistivity difference than the temperature variation within the range studied. In many applications, such as permanent-magnet motors, this behavior has to be taken into account in design.