抄録
Hard disk drives (HDD) are improving rapidly in recording density and transfer rate every year. Development of a spindle motor using fluid dynamic bearings (FDB) is desirable as conventional spindle motors incorporating ball bearings are expected to reach their limitation technically in the near future. This paper describes an experimental approach of lubricant temperature in rotating FDB spindle motor. We used infrared micro thermograph to measure lubricant temperature. Then temperature of lubricant in the rotating spindle motor was measured. We also measured temperature distribution of the thrust bearing. Temperature of the thrust bearing rised immediately when spindle motor started rotating. The temperature rise of the thrust bearig reached 28℃ in 10 minutes at the spindle motor rotation speed of 15,000r/min.
