This page explains the role of high-temperature NdFeB (Neodymium Iron Boron) permanent magnets in high-power PMSM systems. It highlights that standard NdFeB magnets begin to degrade above approximately 80°C, leading to a risk of irreversible demagnetization. To address this limitation, heavy rare earth elements such as dysprosium (Dy) and terbium (Tb) are added to improve coercivity and thermal stability, enabling operation in industrial environments ranging from 150°C to 200°C or higher. The article also outlines different temperature grades (M, H, SH, UH, EH) and their respective applications in industrial motors. It further emphasizes that high-temperature NdFeB is a critical enabling material for reliable operation in high-power applications such as paper mills, steel plants, compressors, and large direct-drive PMSM systems, while also comparing its trade-offs with SmCo magnets in terms of cost, performance, and power density.