Electromechanical Simulation of a Spindle Motor in a Free-Falling HDD

摘要

This research investigates the electromechanical variables of a spindle motor in a free-falling hard disk drive before unexpected shock. Electromechanical simulation includes a time-stepping finite element analysis of a speed controlled brushless DC motor and dynamic analysis of a rotating spindle system supported by hydrodynamic bearing under the free-falling condition. Analysis results show that the coupled effects between the electromagnetic and dynamic characteristics make it possible to detect the free-falling condition of a HDD without using the accelerometer and gyroscope.