Method and apparatus for measuring half frequency whirl in a spindle motor
AssigneeSeagate Technology LLC
InventorsXiong Liu, ChoonKiat Lim, YongJie Tang, Pow-Hing Yong
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Abstract
An apparatus and method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system is provided. Vibration signals produced at the transducer head while the transducer head follows the track are detected. The half frequency whirl is determined as a function of the detected vibration signals.
Claims20
A method of indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system, the method comprising:
- (a) detecting vibration signals produced at the transducer head while the transducer head follows the track;
- and
- (b) determining the half frequency whirl as a function of the detected vibration signals.
A apparatus for indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system, the apparatus comprising:
- a vibration sensor configured to detect vibration signals produced at the transducer head while the transducer head follows the track;
- and
- an analyzer configured to determine the half frequency whirl as a function of the detected vibration signals.
A apparatus for indirectly measuring half frequency whirl in a spindle motor having a rotor adapted to rotate a disc having a track which is followed by a transducer head that is actuated by a control system, the apparatus comprising:
- a vibration sensor configured to detect vibration signals produced at the transducer head while the transducer head follows the track;
- and
- means for determining the half frequency whirl as a function of the detected vibration signals.
Dependencies are inferred from the claim text.