Ring-shaped polymer-bonded magnets (RSMs) were produced from a mixture of an isotropic NdFeB powder, steel use stainless (SUS) powder, and epoxy resins as binders, using a comprehension-molding technique. Morphology of RSM determined by an SEM indicated that inappropriate molding pressure leads surface defect and brings adverse impact on properties of magnets. The research on mechanical properties shows that the maximum tensile strength of 11.4 N was achieved at optimal pressing pressure of 85 kN. Meanwhile, RSM has excellent stability as the critical component of motor and its amount of unbalance is as low as 0.754 mg. Magnetic property in optimal mechanical conditions was also found to be optimum at Hcj = 8.42 kA/m and (BH)max = 31.17 kJ/m3.

中文翻译：

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成型压力对环形粘结NdFeB磁体结构和性能的影响


环形聚合物粘结磁体 (RSM) 采用综合成型技术，由各向同性 NdFeB 粉末、钢用不锈钢 (SUS) 粉末和环氧树脂作为粘合剂制成。 SEM测定的RSM形貌表明，成型压力不当会导致表面缺陷，对磁体性能带来不利影响。力学性能研究表明，在85 kN的最佳压制压力下，最大拉伸强度达到11.4 N。同时，RSM作为电机的关键部件，具有优异的稳定性，不平衡量低至0.754mg。还发现最佳机械条件下的磁性能在 Hcj = 8.42 kA/m 和 (BH)max = 31.17 kJ/m3 时最佳。