Patent ID: 7825557

Claim:
A spindle motor having a fluid dynamic bearing system comprising: a stationary shaft ( 12 ; 112 ; 212 ; 312 ; 412 ; 512 ; 612 ) that is held in a baseplate ( 10 ; 110 ; 210 ; 310 ; 410 ; 510 ; 610 ), a single-piece rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ; 614 ) rotatably supported with respect to the shaft about a rotational axis ( 46 , 146 , 246 , 246 , 446 , 546 , 646 ), two radial bearings ( 22 ; 122 ; 222 ; 322 ; 422 ; 522 ; 622 ) formed between opposing radial bearing surfaces of the shaft ( 12 ; 112 ; 212 ; 312 ; 412 ; 512 ; 612 ) and of the rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ; 614 ), at least one axial bearing ( 26 ; 126 ; 226 ; 326 ; 426 ; 526 ; 526 ), formed between opposing axial bearing surfaces of the rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ; 614 ) and a first bearing component ( 16 ; 116 ; 216 ; 316 ; 416 ; 516 ; 616 ) or of the rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ; 614 ) and a second bearing component ( 18 ; 118 ; 218 ; 318 ; 418 ; 518 ; 618 ), whereby the second bearing component is stationary and has an annular shape and is disposed at an upper end of the stationary shaft, a bearing gap ( 20 ; 120 ; 220 ; 320 ; 420 ; 520 ; 620 ) open at both ends and filled with bearing fluid that separates the adjoining surfaces of the shaft ( 12 ; 112 ; 212 ; 312 ; 412 ; 512 ; 612 ), the rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ; 614 ) and the first and second bearing components ( 16 ; 116 ; 216 ; 316 ; 416 ; 516 ; 526 ; 18 ; 118 ; 218 ; 318 ; 418 ; 518 ; 618 ) from one another, a tapered capillary seal ( 32 ; 132 ; 232 ; 332 ; 432 ; 532 ) formed between a circumferential surface of the rotor component ( 14 ; 114 ; 214 ; 314 ; 414 ; 514 ) or a covering cap ( 430 ; 530 ) and an inclined surface of the first bearing component ( 116 ; 316 ) or the second bearing component ( 18 ; 118 ; 418 ; 518 ), whereby at least one of the two surfaces forming the capillary seal is inclined at an acute angle to the rotational axis, a pumping seal and/or gap seal ( 138 ; 238 ; 338 ; 438 ; 538 ) formed between an inner circumferential surface of the rotor component ( 114 ; 214 ; 314 ; 414 ; 514 ) and an outer circumferential surface of the first bearing component ( 216 ; 416 ; 516 ) or the second bearing component ( 116 ; 316 ) comprising a gap which extends parallel to the bearing gap, but not in extension of the vertical section of the bearing gap, and an electromagnetic drive system ( 42 ; 142 ; 242 ; 342 ; 442 ; 542 ; 642 ; 44 ; 144 ; 244 ; 344 ; 444 ; 544 ; 644 ).