Polarity detection of piezoelectric actuator in disk drive
AssigneeWestern Digital Technologies, Inc.
InventorsHengchang Guo, Duc T. Phan, Yanan Huang, Chuanwen Ji, Yakov M. Lifschitz
Life of this patent
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Abstract
Determining a polarity of a piezoelectric (PZT) actuator of a disk drive including a disk for storing data and a head for reading and writing data. A test signal is injected into the PZT actuator and a position signal is received which indicates a position of the head over the disk resulting from the test signal. A test compensation signal is generated based on the received position signal and the polarity of the PZT actuator is determined based on a phase of the generated test compensation signal.
Claims20
A disk drive comprising:
- a disk for storing data;
- an actuator arm;
- a head connected to the actuator arm for reading data from the disk and for writing data on the disk;
- a piezoelectric (PZT) actuator located between the actuator arm and the head for positioning the head over the disk;
- and
- a controller configured to:
- inject a test signal into the PZT actuator;
- receive a position signal indicating a position of the head over the disk resulting from the test signal;
- generate a test compensation signal based on the received position signal;
- and
- determine a polarity of the PZT actuator based on a phase of the generated test compensation signal.
A method for determining a polarity of a piezoelectric (PZT) actuator of a disk drive, wherein the disk drive includes a disk for storing data, and a head for reading data from the disk and for writing data on the disk, the method comprising:
- injecting a test signal into the PZT actuator;
- receiving a position signal indicating a position of the head over the disk resulting from the test signal;
- generating a test compensation signal based on the received position signal;
- and
- determining the polarity of the PZT actuator based on a phase of the generated test compensation signal.
A non-transitory computer-readable medium storing computer-executable instructions for determining a polarity of a piezoelectric (PZT) actuator of a disk drive, wherein the disk drive includes a disk for storing data, and a head for reading data from the disk and for writing data on the disk, and wherein when the computer-executable instructions are executed by a controller, the controller:
- injects a test signal into the PZT actuator;
- receives a position signal indicating a position of the head over the disk resulting from the test signal;
- generates a test compensation signal based on the received position signal;
- and
- determines the polarity of the PZT actuator based on a phase of the generated test compensation signal.
Dependencies are inferred from the claim text.