Prior to processing magnetic NdFeB material for recycling, it must be demagnetized. Here, we demonstrate a simple low-cost method. Large blocks of NdFeB permanent magnets of dimension 10 cm $\times 7$ cm $\times 2$ cm and with easy axis along the shortest dimension are shown to demagnetize when heated on a planar induction heating device. The initial magnetization of the magnets is reduced by a factor of 10 within a period of 30 min, in which the surface temperature of the magnet reaches 225 °C. This method simplifies the demagnetization process of the permanent magnets in wind turbine generators as part of the rapidly increasing demand for improved recycling capabilities of permanent magnets.

中文翻译：

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大型钕铁硼永磁体消磁的简便方法

在处理磁性 NdFeB 材料以进行回收之前，必须对其进行退磁。在这里，我们展示了一种简单的低成本方法。尺寸为 10 cm 的大块 NdFeB 永磁体 $\times 7$ 厘米 $\times 2$ 厘米和沿最短尺寸的易轴显示在平面感应加热设备上加热时会消磁。磁铁的初始磁化强度在 30 分钟内降低 10 倍，此时磁铁的表面温度达到 225 °C。这种方法简化了风力涡轮发电机中永磁体的退磁过程，这是对提高永磁体回收能力的快速增长需求的一部分。