Life expectancy of motors

Guidelines are presented for assessing the reliability of commercial-grade motors over a period of time when used in mild environments, where, among other effects, total radiation dose would be of the level of 10/sup 4/ rads or less. These guidelines are based on using available data on life tests, failure programs and modes, and selected analytical techniques. The goal is to determine that motors have adequate capability to perform reliably for their designed life term, as long as they are used and maintained properly. To accomplish this goal, standard protection techniques are used. The observations derived from these methods, together with an evaluation of statistical failure data, can provide reliable life expectancies.<
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