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BLDCM蒸煮后噪声大

使用矢量控制去驱动无刷电机,电机蒸煮前电机在40000rpm时噪声大约45db,我拿去高温消毒(134°C)蒸煮10次后,电机在40000rpm时噪声75db。

1、厂家给的电机是可以耐高温蒸煮的,这是什么原因啊?

2、有没有什么方法降低蒸煮后的电机噪声?