Explore bearing skills; build outstanding quality

Source: China Bearing Network Time: 2014-06-14

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These years; the areal density of hard drives is promoted at a rate of 60% to 100% per year. Indeed, this growth rate has enabled Toshiba's 2.5-inch hard drives to use hard drives with a single-disc capacity of 375GB. Together; hard drive motors are also needed With higher speed to meet the needs of the application. Only from the bearing skills; the bearing wear of the ball bearing is larger than the liquid bearing, the working noise and the sensation are difficult to eliminate and the temperature rises faster; in the end is the reason for the hard disk spindle motor Are ball bearings agilely replaced by liquid bearings? What are the characteristics of liquid bearing skills? How to fundamentally reduce the noise of the hard disk? Next, we will analyze one by one:
1. Noise and Oscillation The noise in the hard disk is mainly from the movement of the motor components and the rotating wind noise of the disc. The magnetic ring, bearing column, bearing and disc of the motor are the source of noise. Regarding the ball bearing Although there is a smoothing agent; and the inner wall of the ball and bearing is also smoother. But they have always been touched; high-speed work makes the ball bearings unpredictably noise and sensation. Even the product of 5400rpm. The sound announced in a quieter environment can be very uncomfortable; and the sensation has always existed. Imagine; if the 7200rpm, 10000rpm product still uses ball bearings; then the noise and sensation in its operation must make People can't stand it; liquid bearings are much better than ball bearings in this respect. Because of the high smoothness of the liquid, they are smooth and smooth; they prevent the running noise and sensation caused by the direct touch of metal to metal like ball bearings. Together, the liquid smoothing agent can also have a certain attenuation effect on the external sensation; then it reduces the noise caused by the sensation.
According to the industry's summary data, the liquid bearing motor is 4dB lower than the ball bearing motor noise, and the noise control of the liquid bearing motor can also control the noise at about 20dB. The current Toshiba hard disk has been subjected to various skills to control the hard disk noise. About 20 decibels; basically can be counted as an ultra-quiet hard drive. Therefore, the advantages of the liquid bearing motor in noise control, reduction of resonance, enhanced shock resistance, improved speed and acoustic function are clear.
2, the temperature "We all have this experience; the palms of the two hands constantly conflict with each other; in a flash can feel the temperature of the palm is rising. If the frequency of the conflict is higher, the longer the time; the higher the temperature. The appearance of the same is true for traditional ball bearings; and the ball bearings that cannot be prevented are actually divided into two types; one is steel ball (usually used for desktop ATA hard disk). The other is made of sintered silicon nitride. The main component of the ceramic ball. The steel ball has a large expansion coefficient after heating, and the hardness is better than that of the sun, the reef, the reef, the cockroach, the cockroach, the cockroach, the cockroach, the cockroaché™¨æ·¼å‘è›˜ ç°¿ ç°¿ å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· å· ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— ç‰Ÿè±¢èŠé¦— . . . . . . . . noise.
The liquid bearing motor is cavity-sealed; the liquid smoothing agent is completely sealed; inductive thinking of various characterizations allows the motor to rotate without any leakage. And this special liquid smoothing agent has a much higher expansion coefficient than the ball.è†Š å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– å¬– æ—¥ æ—¥ æ—¥ æ—¥ æ—¥ æ—¥ æ—¥ æ—¥
Nowadays, there is a new member gas bearing in the bearing family. Its theoretical speed can reach 50,000 rpm or higher; it has been practiced in military fields such as nuclear submarines. Therefore, even liquid bearings cannot satisfy the needs of future hard disk applications; they cannot satisfy everyone's need for hard disk noise; they also have more advanced skills. For us.

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