| 主权项 |
1. A spindle motor having a fluid dynamic bearing system comprising:
a stationary shaft (12; 212; 312) that is held directly or indirectly in a baseplate (10, 210; 310), a rotor component (14, 114a; 214; 314a-c) rotatably supported with respect to the shaft about a rotational axis (46; 246; 346), a bearing gap (20, 220; 320) open at both ends filled with a bearing fluid that separates the adjoining surfaces of the shaft (12; 212; 312), the rotor component (14, 114a; 214; 214a-c) and at least one first bearing part (16, 216; 316) from one another, a first radial bearing (22a, 222a; 322a) and a second radial bearing (22b, 222b; 322b) formed between the opposing axially extending bearing surfaces of the shaft (12; 212; 312) and the rotor component (14, 114a; 214; 314a-c), an axial bearing (26, 226; 326) formed between the opposing radially extending bearing surfaces of the rotor component (14, 114a; 214; 314a-c) and the first bearing part (16, 216; 316) connected to the baseplate, a recirculation channel (28; 128; 228; 328) filled with bearing fluid that connects the remote regions of the bearing to each other, and an electromagnetic drive system (42, 44; 342, 244) for driving the rotor component, and characterized in that the recirculation channel (28, 128; 228) ends in a gap (21) radially outside of the bearing gap (20) of the axial bearing (26), the width of the gap (21) being greater than the width of the bearing gap (20). |
