Abstract
This paper describes a temperature analysis of FDB spindle motor carried out to investigate temperature of lubricating oil in FDB. Increases in the oil temperature exert significant influences on the performance and life of an FDB. Therefore it is important to study the oil temperature when the spindle motor runs. Then, we analyzed a temperature of lubricating oil in FDB spindle motor by experimental approach and numerical analysis approach. In experimental approach, the temperature of thrust bearing was measured using infrared micro thermograph. Then temperature of lubricating oil in the rotating spindle motor was measured. On the other hand, in numerical analysis approach, temperature of lubricating oil was calculated through the thermo-fluid analysis of lubricating oil and the heat conduction analysis of FDB spindle motor. The calculated results showed good agreements with the experimental results. It became cleare the temperature of lubricating oil increased exponentially with rotational speed of spindle motor.
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