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Novel magnetizing technique using HTS bulk magnet for permanent magnets in IPM rotor
Superconductor Science and Technology ( IF 3.6 ) Pub Date : 2020-06-29 , DOI: 10.1088/1361-6668/ab9543
T Oka 1 , S Hasebe 2 , J Ogawa 2 , S Fukui 2 , T Nakano 2 , N Sakai 1 , M Miryala 1 , M Murakami 1 , K Yokoyama 3
Affiliation  

A novel magnetizing technique for permanent magnets (PMs) embedded in the interior permanent magnet (IPM) motors has been proposed as a safer and more effective process than the conventional processes using copper pulse-coils. In the new process, the high temperature superconducting (HTS) bulk magnet emitting intense magnetic field of over 3 T was employed to activate the rotor and PMs inside. A magnetic pole containing the HTS bulk magnet was scanned on the surface of IPM rotor, resisting against the extremely strong attractive force between the magnet and rotor. Following the experiments in the past, the numerical simulation studies have been conducted to evaluate the magnetic field-trapping performances of the PMs. In this study, the numerical analysis of the magnetization behaviours was conducted for the PMs embedded in the rotor of the commercial air-conditioner motor in the hybrid car. The simulation results showed us that the demagnetized Nd-Fe-B plates in the rotor were fully magnetized in the intense static magnetic fields on the magnetic pole containing the HTS bulk magnet. The magnetizing behaviour in this peculiar magnetizing operation was understandable by estimating the anisotropic easy-direction of the PM plates embedded in the rotor. The novel activation method for PM is characterized as a no-shock and no-heating method, which would promote the degree of freedom on the IPM motor designing.

中文翻译:

IPM转子中永磁体使用HTS块状磁铁的新型磁化技术

与使用铜脉冲线圈的传统工艺相比,已提出一种用于嵌入内部永磁 (IPM) 电机中的永磁 (PM) 的新型磁化技术,作为一种更安全、更有效的工艺。在新工艺中,高温超导 (HTS) 块状磁铁发出超过 3 T 的强磁场,用于激活内部的转子和 PM。在IPM转子表面扫描包含HTS块状磁铁的磁极,抵抗磁铁和转子之间极强的吸引力。在过去的实验之后,已经进行了数值模拟研究来评估 PM 的磁场俘获性能。在这项研究中,对混合动力汽车商用空调电机转子中嵌入的永磁电机的磁化行为进行了数值分析。仿真结果表明,转子中退磁的 Nd-Fe-B 板在包含 HTS 块状磁铁的磁极上的强静磁场中完全磁化。通过估计嵌入转子中的永磁板的各向异性易磁化方向,可以理解这种特殊磁化操作中的磁化行为。PM的新型激活方法的特点是无冲击和无加热方法,这将提高IPM电机设计的自由度。仿真结果表明,转子中退磁的 Nd-Fe-B 板在包含 HTS 块状磁铁的磁极上的强静磁场中完全磁化。通过估计嵌入转子中的 PM 板的各向异性易磁化方向,可以理解这种特殊磁化操作中的磁化行为。PM的新型激活方法的特点是无冲击和无加热方法,这将提高IPM电机设计的自由度。仿真结果表明,转子中退磁的 Nd-Fe-B 板在包含 HTS 块状磁铁的磁极上的强静磁场中完全磁化。通过估计嵌入转子中的 PM 板的各向异性易磁化方向,可以理解这种特殊磁化操作中的磁化行为。PM的新型激活方法的特点是无冲击和无加热方法,这将提高IPM电机设计的自由度。
更新日期:2020-06-29
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