Spindle motor start control process and apparatus

Details Spindle motor start control process and apparatus Spindle motor start control process and apparatus

1994-08-15

1995-11-14

Ro, Bentsu

Electricity: motive power systems

Motor load, armature current or force control during...

Initial, 'cracking' or 'starting from rest' torque control

318439, 318459, 318254, H02P 620

Patent

active

054669995

ABSTRACT:
A method for starting spin-up of a spindle motor in a hard disk drive. When power is initially applied to the spindle motor, the spindle motor is set to a first commutation state. The spindle motor is maintained in this first commutation state for a pre-determined period of time to allow the spindle motor to reach a known null point. Thereupon, the spindle motor is advanced to a second commutation state. The spindle motor is then maintained at this second commutation state for another pre-determined period of time. Finally, the spindle motor is advanced two successive commutation states to a peak torque curve. Once the spindle motor has started spinning, the commutation process is controlled according to the sensed back EMF voltage being generated in the off-phase.

REFERENCES:
patent: 4264853 (1981-04-01), Morishita
patent: 4835448 (1989-05-01), Dishner et al.
patent: 5298838 (1994-03-01), Peters et al.
patent: 5298839 (1994-03-01), Takeda

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