Magnetic disk device and parameter setting method of magnetic disk device
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorTakuji Matsuzawa
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Abstract
According to one embodiment, a magnetic disk device comprises an actuator, a controller that controls the actuator, a loop shaping filter connected in parallel with the controller, the loop shaping filter having a parameter for suppressing a rotation asynchronous disturbance affecting the actuator, the parameter of the loop shaping filter being determined using a transfer function from an output of the loop shaping filter to before an input of the rotation asynchronous disturbance, and a notch filter that suppresses mechanical resonance of the actuator.
Claims4
A magnetic disk device comprising:
- an actuator;
- a controller that controls the actuator;
- a loop shaping filter connected in parallel with the controller, the loop shaping filter having a parameter for suppressing a rotation asynchronous disturbance affecting the actuator, the parameter of the loop shaping filter being determined using a transfer function from an output of the loop shaping filter to before an input of the rotation asynchronous disturbance;
- and
- a notch filter that suppresses mechanical resonance of the actuator, wherein
- a parameter of the notch filter is changed according to a change in the actuator, and simultaneously the loop shaping filter is redesigned by reflecting a change in the transfer function.
A parameter setting method of a magnetic disk device used for the magnetic disk device comprising:
- an actuator;
- a controller that controls the actuator;
- a loop shaping filter connected in parallel with the controller, the loop shaping filter having a parameter for suppressing a rotation asynchronous disturbance affecting the actuator, the parameter of the loop shaping filter being determined using a transfer function from an output of the loop shaping filter to before an input of the rotation asynchronous disturbance;
- and
- a notch filter that suppresses mechanical resonance of the actuator,
- the parameter setting method comprising:
- changing a parameter of the notch filter according to a change in the actuator, and simultaneously redesigning the parameter of the loop shaping filter by reflecting a change in the transfer function.
Dependencies are inferred from the claim text.