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Motor current is monitored in a disc drive system to detect the presence of a disc, a bearing jam or bearing deterioration, and a broken or missing belt.
English (United States)
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Sensing Disc Drive Operation
Motor current is monitored in a disc drive system to detect the presence of a
disc, a bearing jam or bearing deterioration, and a broken or missing belt.
Average disc drive motor current is sensed by one or more networks which,
for example, provide output signals indicative of an average motor current above
predetermined thresholds associated with (1) a properly operating system
without a disc, (2) a properly operating system with a disc, and (3) a system with
an abnormally high load on the disc drive motor. Current below the first
threshold indicates a broken or missing drive belt due to an abnormally low motor
load. A current level below the second threshold indicates the absence of a disc
in the system, while current above the third threshold indicates severe bearing
deterioration or a bearing jam in the disc drive mechanism.