Positioning adaptive control method and positioning device as well as information storage device

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that said speed error is reduced by using said feedback control input and said feed forward control input to control the head during movement.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that a square of said speed error is minimized by using said feedback control input and said feed forward control input to control said head when the head speed starts to decelerate.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that a value obtained when square values of said speed error are added sequentially is minimized by using said feedback control input and said feed forward control input to control said head when the head speed starts to decelerate.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a position error between a target position and a head position and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that said position error is reduced by using said feedback control input and said feed forward control input to control said head during movement.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a position error between a target position and a head position and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that a square of said position error is minimized by using said feedback control input and said feed forward control input to control said head when movement begins.

A positioning adaptive control method for moving a head to a target position, the method comprising the step of:

• adding a feedback control input based on a position error between a target position and a head position and a feed forward control input based on a target acceleration;
• sequentially adjusting a gain of a control system for controlling said feed forward control input so that a value obtained when square values of said position error are added sequentially is minimized by using said feedback control input and said feed forward control input to control said head when movement begins.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed, a first feed forward control input based on a target acceleration, and a second feed forward control input based on an acceleration disturbance signal;
• sequentially adjusting a gain of a control system for controlling said first and second feed forward control inputs so that said speed error is reduced by using said feedback control input, said first feed forward control input and said second feed forward control input to control said head during head movement.

A positioning adaptive control method for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a position error between a target position and a head position, a first feed forward target acceleration and a control input based on second feed forward control input based on an acceleration disturbance signal;
• sequentially adjusting a gain of a control system for controlling said first and second feed forward control inputs so that said position error is reduced by using said feedback control input, said first feed forward control input and said second feed forward control input to control said head during head movement.

A positioning adaptive control method for generating a control input for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed and a feed forward control input based on a target acceleration, wherein a variable gain is provided at an arbitrary place from the control input for the speed signal of said head;
• and
• sequentially adjusting said variable gain for controlling said feed forward control input so that said speed error is reduced by using said feedback control input and said feed forward control input to generate the control input even if said variable gain is increased or reduced during head movement in order to immediately reduce said speed error which has been increased due to a gain change of said variable gain.

A positioning adaptive control method for generating a control input for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a speed error between a target speed and a head speed and a feed forward control input based on a target acceleration, wherein a variable gain is provided at an arbitrary place from the control input for the speed signal of said head;
• sequentially adjusting said variable gain for controlling said feed forward control input so that said speed error is reduced by using said feedback control input and said feed forward control input to generate the control input even if said variable gain is increased or reduced in advance to immediately equalize the speed signal of said head which has fluctuated due to a gain change of said variable gain to a state before the gain change of said variable gain.

A positioning adaptive control method for generating a control input for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a position error between a target position and a head position and a feed forward control input based on a target acceleration, wherein a variable gain is provided at an arbitrary place from the control input for the position signal of said head;
• and
• sequentially adjusting said variable gain for controlling said feed forward control input so that said position error is reduced by using said feedback control input and said feed forward control input to generate the control input even if said variable gain is increased or reduced during head movement to immediately reduce said position error which has been increased due to a gain change of said variable gain.

A positioning adaptive control method for generating a control input for moving a head to a target position, the method comprising the steps of:

• adding a feedback control input based on a position error between a target position and a head position and a feed forward control input based on a target acceleration, wherein a variable gain is provided at an arbitrary place from the control input for the position signal of said head;
• and
• sequentially adjusting said variable gain for controlling said feed forward control input so that said position error is reduced by using said feedback control input and said feed forward control input to generate the control input even if said variable gain is increased or reduced in advance to immediately equalize the position signal of said head which has fluctuated due to a gain change of said variable gain to a state before the gain change of said variable gain.

A positioning adaptive control method for positioning a head to a target track on a disk during a seek operation, the method comprising the steps of:

• adaptively controlling a feed forward loop having an input based on a target acceleration for the head to obtain a feed forward control input;
• and
• using said feed forward control input to position said head.

Apparatus for positioning a head to a target track on a disk during a seek operation using a feed forward control input, comprising:

• an adaptive controller arranged in a feed forward loop having an input based on a target acceleration for the head, the adaptive controller outputting the feed forward control input;
• a control unit coupled to the head receiving a control signal dependent on the feed forward control input to position the head.