First, the air gap should be selected such that the working point is above the Knee in the demagnetization curve that it does not fall into the region of steep decline at the temperatures expected.

• 当温度回复，磁化强度也恢复，这一现象叫温度可逆性损失。但是，在不同的温度下工作，温度回复后，磁性能仍有部分不能恢复，这种现象叫做不可逆性损失。