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MTBF can simply be defined as the total operating time of a device divided by the total number of field failures. Since this is an averaged value, it will not be very useful for understanding the expected life of an individual component and therefore Sanyo Denki does not recommend using it as the primary source for determining life. For many standard Sanyo Denki Products the MTBF life can be estimated above three million hours. Weibull curves or “bath curves” will include the accumulation of three different failure phases: infant mortality, normal life, and end of life. A traditional curve will look similar to the value shown where a greater failure rate will occur during the initial installation and as the product reaches end of life but will have minimal failure rate during standard operation. While this information can be beneficial for understanding when a fan will fail during it’s life, this data is very difficult to gather since it requires a large sample size over a prolonged period.
