Data storage device compensating for hysteretic response of microactuator

A data storage device comprising:

• a head;
• a disk;
• a microactuator configured to actuate the head over the disk;
• and
• control circuitry configured to:
• inject a sinusoid into a control signal applied to the microactuator and measure a sinusoidal response of the microactuator;
• and
• generate a Preisach plane based on at least two cycles of the measured sinusoidal response, wherein the Preisach plane models a hysteretic response of the microactuator.

A method of operating a data storage device, the method comprising:

• generating a control signal applied to a microactuator based on an input sequence u(k), wherein the microactuator is configured to actuate a head over a disk;
• updating a Preisach bit map bj based on the input sequence u(k), wherein the Preisach bit map bj corresponds to a Preisach plane modeling a hysteretic response of the microactuator;
• generating a current compensation value yi based on an update value generated based on:
• ∑
• j
• ⁢
• h
• ⁡
• (
• j
• )
• ⁢
• b
• ^
• j
• where hj represents a slice of the Preisach plane and {circumflex over (b)}j is an update bit map based on at least part of the Preisach bit map bj;
• and
• combining a current input ui and the current compensation value yi to generate the control signal applied to the microactuator.

A method of operating a data storage device, the method comprising:

• actuating a head over a disk using a microactuator;
• injecting a sinusoid into a control signal applied to the microactuator and measure a sinusoidal response of the microactuator;
• and
• generating a Preisach plane based on at least two cycles the measured sinusoidal response, wherein the Preisach plane models a hysteretic response of the microactuator.