METHOD AND SYSTEM FOR DRIVING THREE-PHASE MOTOR IN MASS STORAGE DEVICE

摘要

PURPOSE: A method and system for driving three-phase motor in mass storage device are provided to reduce the harmonic content of the torque waveform associated with the phase currents and reduce the related acoustic noise emitted by motor by means of eliminating the abrupt changes in the phase currents. CONSTITUTION: A method for driving three-phase electric motor in mass storage device includes generating a periodic, driving voltage. The driving voltage comprises a sequence of a first, a second, and a third waveforms. The first waveform in the sequence is a generally constant, high voltage. The second waveform in the sequence is a down hook voltage. The third waveform in the sequence is an up hook voltage. The method also includes applying the driving voltage to a coil of the motor to generate a generally sinusoidal current through the coil of the motor.