an electric spindle motor for use in precision instruments such as hard disk drives comprises a stationary sub - assembly and a rotary sub - assembly movable relative to the stationary sub - assembly for carrying magnetic disks . the electric spindle motor has an integrated bearing system including a hydrodynamic journal bearing for providing desired radial load and a magnetic bearing for reducing friction resistance during staring / stopping and running of the electric spindle motor . the rotary sub - assembly is suspended from the stationary sub - assembly by the activation of the magnetic bearing during the rotating of the electric spindle motor . the electric spindle motor having integrated hydrodynamic journal bearing and magnetic bearing of the present invention is capable of high speed and high accuracy running , providing increased radial load and stiffness , and reduces the friction resistance therefore improves the performance and power saving .