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Variation Of Pinning Mechanism And Enhancement Of Critical Current Density In Mgb2 Bulk Containing Self-Generated Coherent Mgb4 Impurity, Qi Cai, Yongchang Liu, Zongqing Ma, Huijun Li, Liming Yu
Variation Of Pinning Mechanism And Enhancement Of Critical Current Density In Mgb2 Bulk Containing Self-Generated Coherent Mgb4 Impurity, Qi Cai, Yongchang Liu, Zongqing Ma, Huijun Li, Liming Yu
Australian Institute for Innovative Materials - Papers
Bulk MgB2, with self-generated MgB4 pinning centers, have experienced two-step sintering process, initially at 750°C and then 900-1000°C. On the contrary to the widely accepted point that MgB 4 deteriorates superconductivity, it was found that MgB4 played a significant role in enhancing critical current density. The precipitation pattern of MgB4 was studied from the lattice scale images. It was observed that the initial coherent relation between the MgB 4 and the matrix was destroyed to become semi-coherent and even incoherent as the second-step sintering temperature increased. Owing to the lattice distortion caused by the elastic accommodation of the coherent interface, …
Influence Of Inductance Variation On Performance Of A Permanent Magnet Claw Pole Soft Magnetic Composite Motor, Youguang Guo, Jian Zhu, Zhi Lin, Haiyan Lu, Xiaolin Wang, Jiaxin Chen
Influence Of Inductance Variation On Performance Of A Permanent Magnet Claw Pole Soft Magnetic Composite Motor, Youguang Guo, Jian Zhu, Zhi Lin, Haiyan Lu, Xiaolin Wang, Jiaxin Chen
Australian Institute for Innovative Materials - Papers
Winding inductance is an important parameter in determining the performance of electrical machines, particularly those with large inductance variation. This paper investigates the influence of winding inductance variation on the performance of a three-phase three-stack claw pole permanent magnet motor with soft magnetic composite (SMC) stator by using an improved phase variable model. The winding inductances of the machine are computed by using a modified incremental energy method, based on three-dimensional nonlinear time-stepping magnetic field finite element analyses. The inductance computation and performance simulation are verified by the experimental results of an SMC claw pole motor prototype.