Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Table 2

Prescribed constraint values.

Parameters	Values
Groove number 𝑁	6,7,8,…,16
Minimum seal radius ratio 𝑟𝑠min	0.4
Maximum seal radius ratio 𝑟𝑠max	0.8
Minimum groove depth ℎ𝑔min (m)	5.0×10^−6
Maximum groove depth ℎ𝑔max (m)	1.5×10^−5
Minimum groove width ratio 𝛼min	0.4
Maximum groove width ratio 𝛼max	0.9
Minimum geometry parameter 𝜑1∼4min (deg)	−180
Maximum geometry parameter 𝜑1∼4max (deg)	180
Allowable film thickness ℎ𝑎 (m)	2.0×10^−6,; 3.0×10^−6,; 4.0×10^−6