Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Patent
1995-09-06
1997-05-20
Masih, Karen
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
318254, 318138, 318439, H02P 506
Patent
active
056319991
ABSTRACT:
Apparatus and method for adaptively compensating for variations in rotational speed of a back emf commutated spindle motor in a hard disc drive. After the motor achieves nominal operating speed, the hard disc drive enters a learn mode during which systematic variations in operational speed of the spindle motor are characterized over a plurality of rotations, including characterization of the average timing of zero crossing signals with respect to reference frequency periods and characterization of the average time between successive zero crossing signals. The hard disc drive next enters a compensation mode, during which modified speed control timing signals and modified commutation timing signals are outputted in response to the average timing characterized during the learn mode.
REFERENCES:
patent: 3794899 (1974-02-01), Breslow
patent: 3996454 (1976-12-01), Froyd
patent: 4063146 (1977-12-01), Oliver
patent: 4654566 (1987-03-01), Erdman
patent: 4811835 (1989-03-01), Bullivant et al.
Heller III Edward P.
Masih Karen
McCarthy Bill D.
McCarthy Randall K.
Seagate Technology Inc.
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