Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1995-02-17
1996-09-17
Wysocki, Jonathan
Electricity: motive power systems
Limitation of motor load, current, torque or force
361 23, H02P 300
Patent
active
055571832
ABSTRACT:
Disclosed is a disk drive having a spindle motor, a disk that is rotated by the spindle motor, and a movable actuator arm that carries a read/write head. The head physically engages a parked, or home, position at the Inner Diameter (ID) of the disk when the spindle motor is not energized and the disk is stationary. The electrical energization that must be applied to the spindle motor in order to breakaway the head from the disk (i.e., the breakaway current), and the energization that is necessary to cause the motor to achieve a stable spinning state (i.e., the spin current) are monitored. Possible future failure of the disk drive is predicted as a function of any changes in these two electrical parameters, as these parameters may change over a period of time; i.e., may change over a number of disk drive stop/start events.
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"Start-Up Assist By Resonant Actuator Displacement", Research Disclosure, Sep. 1991, p. 662.
Bates Randall M.
Glaess David F.
Larson Thomas S.
Wadkins Patricia J.
Cary Charles C.
International Business Machines - Corporation
Sirr Francis A.
Wysocki Jonathan
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