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首页> 外文会议>2015 IEEE Petroleum and Chemical Industry Committee Conference >Impacts of reduced motor cooling on reliability
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Impacts of reduced motor cooling on reliability

机译：减少电机冷却对可靠性的影响

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It has been well documented that bearing failures are the leading cause for grease lubricated motor repairs and grease service life deterioration is a leading cause of bearing failures. Grease service life deteriorates rapidly with elevated operating temperatures, so it may be ascertained that a design change significantly reducing motor cooling would result in elevated bearing temperature, marginal lubrication, premature bearing failures, and reduced motor reliability. In recent years the ever increasing drive for higher motor efficiencies has resulted in motor designs with less cooling capacity. A recent refinery motor reliability study confirms this correlation and highlights the issue with inadequately cooled motors. Results of the study reveal why new IEEE Standard 841 high efficiency motors are at greater risk of a drive end bearing failure than the older motors they are replacing. The current IEEE Standard 841 allowable bearing temperature rise is exceedingly high (50C/90F rise on 2 pole motors). To optimize bearing service life and motor reliability this allowable temperature rise should be reduced significantly.
机译：已有文献证明，轴承故障是润滑脂润滑的电动机维修的主要原因，而润滑脂使用寿命的下降是轴承故障的主要原因。润滑脂的使用寿命会随着工作温度的升高而迅速恶化，因此可以确定，设计变更会大大降低电动机的冷却能力，从而导致轴承温度升高，润滑不足，轴承过早失效并降低电动机的可靠性。近年来，为提高电机效率而不断增加的驱动力导致电机设计的冷却能力降低。近期的炼油厂电动机可靠性研究证实了这种相关性，并强调了冷却不充分的电动机的问题。研究结果揭示了为什么新的IEEE标准841高效电动机比替代的旧电动机有更大的传动端轴承故障风险。当前的IEEE标准841允许的轴承温度升高非常高（两极电机升高50C / 90F）。为了优化轴承的使用寿命和电动机的可靠性，应大幅度降低允许的温升。

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