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A Threshold Judgment Anti-Saturation Method for Piezoelectric Actuators in Hard Disks

A piezoelectric actuator and threshold judgment technology, applied in the hard disk field, can solve problems such as anti-saturation problems that are not considered, and achieve the effect of improving PES performance and high-precision control

Active Publication Date: 2019-09-24
CAS HEFEI INST OF TECH INNOVATION
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Problems solved by technology

[0007] The purpose of the present invention is to solve the defect that the anti-saturation problem under different high and low saturation levels is not considered in the prior art, and to provide a threshold judgment anti-saturation method for piezoelectric actuators in hard disks to solve the above problems

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  • A Threshold Judgment Anti-Saturation Method for Piezoelectric Actuators in Hard Disks

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Embodiment Construction

[0039] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:

[0040] Such as figure 1 As shown, a threshold judgment anti-saturation method for a piezoelectric actuator in a hard disk according to the present invention includes the following steps:

[0041] The first step is the design of the threshold segment function.

[0042] In existing anti-saturation techniques, only one set of anti-saturation linear gains is used to ensure global stability and minimize saturation performance degradation caused by arbitrary perturbations. In the present invention, an anti-saturation nonlinear compensation method is proposed to solve the performance degradation caused by the saturation problem. When the PZT control command is slightly higher than the saturation limit or the control command is significantly...

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Abstract

The invention relates to a threshold judgment anti-saturation method for a piezoelectric actuator in a hard disk, the method overcoming the defect of anti-saturation without considering different highand low saturation levels compared with the prior art. The method comprises the following steps: design of a threshold piecewise function; acquisition of saturated block signal values; saturation analysis; low-level anti-saturation treatment; high-level anti-saturation treatment. A piecewise linear function is adopted to design a nonlinear compensation function, and thus different anti-saturationgains at high and low saturation levels can be adjusted.

Description

technical field [0001] The invention relates to the technical field of hard disks, in particular to a threshold judgment anti-saturation method for piezoelectric actuators in hard disks. Background technique [0002] With the ever-increasing demand for high track density and high data storage density, improving the performance of precise positioning of servo systems in the HDD industry, high-bandwidth piezoelectric actuators (PZT) installed in voice coil motor (VCM) drives have now been used On HDD, and for the servo control of these bipolar drive (DSA) systems, although PZT has a better frequency response than VCM, there are still challenges in the control technology. [0003] Since the displacement range of the microdrive is very limited, the amplitude and slew rate saturation of the PZT loop must be considered. Linear control designs can only get the PZT to work correctly over a limited range due to saturation limitations. When PZT is subject to prolonged saturation tim...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B5/55
Inventor 吴雪莲王海雷李文波
Owner CAS HEFEI INST OF TECH INNOVATION
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