Spindle motor having a fluid dynamic bearing system and a stationary shaft

USRE45387E1 · kind E1 · reissue

Assignee

• Minebea Co., Ltd. · JP

Inventors

• Vladimir V. Popov · Villingen-Schwenningen, DE
• Jurgen Fleig · St. Georgen, DE
• Martin Bauer · Villingen-Schwenningen, DE
• Guido Schmid · Triberg, DE
• Olaf Winterhalter · Epfendorf, DE
• Matthias Wildpreth · Villingen-Schwenningen, DE
• Thomas Fuss · Anzing, DE
• Martin Engesser · Donaueschingen, DE
• Stefan Schwamberger · Hermsdorf, DE

Key dates

• Filing date: Jul 18, 2013
• Grant date: Feb 24, 2015
• Expiry date: Jul 18, 2033

Classification

• Technology area (CPC —): General

Abstract

The invention relates to a spindle motor having a fluid dynamic bearing system comprising axial and radial bearings that contains a rotor component (14) which encloses a stationary shaft (12), which in turn is connected at both its ends to axially aligned bearing parts (16; 18) that are fashioned such that they form capillary sealing gaps (32; 34), a recirculation channel (28) filled with bearing fluid that connects the remote regions of the bearing to each other, and an electromagnetic drive system (42, 44) for driving the rotor component.