降额设计是电路可靠性设计中的一种常用方法，通过降额设计可以达到降低器件基本失效率、提高产品使用可靠性的目的。

Through derating design, it can derate the basic failure rate of the components and improve the useing reliability of the product.

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从热源、失效率入手，分析了热产生的机理，并提出了电子设备热设计的基本方法。

The article begins from heat source and failure rate, analyzes heat treatment mechanism and discusses heat designing methods of electronic equipments.

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现场使用的电机基本运行在偶然失效阶段，因而其失效率近似为一常数。

The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.

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