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公开(公告)号：EP0260138A2
公开(公告)日：1988-03-16
申请号：EP87308010.5
申请日：1987-09-10
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi
CPC classification number: G11B5/59622 , G05B19/19 , G05B2219/37313 , G05B2219/41023 , G05B2219/42032 , G05B2219/42104
Abstract: A servo control system having a coarse control unit (2) and a fine control unit (3) wherein a differential gain is changed temporarily for a short period at an initial state of fine control to shorten a settling time and to reduce overshoot.
The servo control system includes a controlled system (1) including a controlled object (12) and a drive unit (13), a unit (2) for controlling a speed of the controlled object to move and position the same to a reference position, and a unit (3) having a differential control circuit and for controlling a position of the controlled object to position the controlled object to the reference position, after the speed control unit (2) has moved the controlled object (12) to a position adjacent to the reference position. A differential gain of the differential control circuit is selected from at least two values, a first of which is used at an initial state and a second of which is used after the initial state.
The servo control system is applicable to a disc system, a printer, etc.Abstract translation: 一种具有粗略控制单元（2）和精细控制单元（3）的伺服控制系统，其中微调增益在微调控制的初始状态下短暂地改变，以缩短建立时间并减少过冲。 伺服控制系统包括受控对象（12）和驱动单元（13）的受控系统（1），用于控制受控对象的移动速度并将其定位到参考位置的单元（2） 以及具有差速控制电路并且用于控制受控对象的位置以将受控对象定位到参考位置的单元（3），在速度控制单元（2）已经将受控对象（12）移动到相邻位置之后 参考位置。 差分控制电路的差分增益从至少两个值中选择，第一个值在初始状态下使用，第二个值在初始状态之后使用。 伺服控制系统适用于光盘系统，打印机等
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公开(公告)号：EP0419303B1
公开(公告)日：1995-03-29
申请号：EP90402301.7
申请日：1990-08-16
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi
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Patent Agency Ranking
公开(公告)号：EP1267331A2
公开(公告)日：2002-12-18
申请号：EP02018030.3
申请日：1995-01-04
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi , Nagasaka, Yoshiyuki , Kozuka, Tamotsu , Yoshida, Susumu , Takahashi, Tsuyoshi , Ishii, Masayoshi
CPC classification number: G11B19/20 , G11B5/012 , G11B5/03 , G11B5/035 , G11B5/39 , G11B5/40 , G11B5/4886 , G11B5/5521 , G11B5/5547 , G11B5/56 , G11B5/59683 , G11B19/02 , G11B19/04 , G11B19/28 , G11B21/085 , G11B21/18 , G11B2005/0018
Abstract: A method of controlling a magnetic disk drive including: at least one magnetic head including a write element for writing data to a magnetic disk (100) and a magneto-resistive element for reading the data from the magnetic disk; a spindle motor for rotating the magnetic disk; and a rotary type actuator (101) for locating the magnetic head in a desired track position on the magnetic disk, the method comprising: a step of detecting whether or not the spindle motor reaches steady rotation from rotating start; a step of starting a supply of a bias current to the magneto-resistive element according to a detection of the steady rotation; a step of detecting that the write head performs on a data writing and detecting that there is no access to the drive between a predetermined interval during supply of the bias current to the magneto-resistive element; and a step of stopping the supply of a bias current to the magneto-resistive element when detecting that the write head performs on a data writing or that there is no access to the drive between a predetermined interval.
Abstract translation: 一种控制磁盘驱动器的方法，包括：至少一个磁头，包括用于将数据写入磁盘（100）的写入元件和用于从磁盘读取数据的磁阻元件; 用于旋转磁盘的主轴电机; 以及用于将磁头定位在磁盘上的期望磁道位置上的旋转型致动器（101），该方法包括：检测主轴电机是否从旋转开始达到稳定旋转的步骤; 根据稳定旋转的检测开始向磁阻元件提供偏置电流的步骤; 检测写入头对数据写入执行的步骤，并检测在向所述磁阻元件提供所述偏置电流期间在预定间隔之间不存在对所述驱动器的访问; 以及当检测到写入头执行数据写入或停止在预定间隔之间访问驱动器时停止向磁阻元件提供偏置电流的步骤。
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公开(公告)号：EP0260138B1
公开(公告)日：1993-07-14
申请号：EP87308010.5
申请日：1987-09-10
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi
CPC classification number: G11B5/59622 , G05B19/19 , G05B2219/37313 , G05B2219/41023 , G05B2219/42032 , G05B2219/42104
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公开(公告)号：EP1267331A3
公开(公告)日：2004-01-02
申请号：EP02018030.3
申请日：1995-01-04
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi , Nagasaka, Yoshiyuki , Kozuka, Tamotsu , Yoshida, Susumu , Takahashi, Tsuyoshi , Ishii, Masayoshi
CPC classification number: G11B19/20 , G11B5/012 , G11B5/03 , G11B5/035 , G11B5/39 , G11B5/40 , G11B5/4886 , G11B5/5521 , G11B5/5547 , G11B5/56 , G11B5/59683 , G11B19/02 , G11B19/04 , G11B19/28 , G11B21/085 , G11B21/18 , G11B2005/0018
Abstract: A method of controlling a magnetic disk drive including: at least one magnetic head including a write element for writing data to a magnetic disk (100) and a magneto-resistive element for reading the data from the magnetic disk; a spindle motor for rotating the magnetic disk; and a rotary type actuator (101) for locating the magnetic head in a desired track position on the magnetic disk, the method comprising: a step of detecting whether or not the spindle motor reaches steady rotation from rotating start; a step of starting a supply of a bias current to the magneto-resistive element according to a detection of the steady rotation; a step of detecting that the write head performs on a data writing and detecting that there is no access to the drive between a predetermined interval during supply of the bias current to the magneto-resistive element; and a step of stopping the supply of a bias current to the magneto-resistive element when detecting that the write head performs on a data writing or that there is no access to the drive between a predetermined interval.
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公开(公告)号：EP0419303A1
公开(公告)日：1991-03-27
申请号：EP90402301.7
申请日：1990-08-16
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi
Abstract: The control system includes a coil phase detecting circuit (14) for detecting a change of stator coil phase based on detecting a rotor magnetic pole; a spindle motor driving circuit (16) for controlling a supply of power to the coils based on the detecting signal; a rotation reference signal generating circuit (18) whose output defines the constant speed of the spindle motor; a real rotation detecting circuit (20) that provides an index signal based on the detection of real rotation; a coil phase selection timing circuit (22) for deciding a selection timing of the coil phase based on the detecting signal and for providing a coil phase selecting signal based on said deciding a selection timing; and a microprocessor for determining a pulse width of a PWM signal based on a phase difference between the rotation reference signal and the index signal, and for providing the PWM control signal with the determined pulse width in synchronization with the choice of the coil phase selection timing circuit to the spindle motor driving circuit.
Abstract translation: 控制系统包括线圈相位检测电路（14），用于基于检测转子磁极来检测定子线圈相位的变化; 主轴电动机驱动电路（16），用于基于检测信号控制对线圈的供电; 旋转参考信号发生电路（18），其输出限定主轴电动机的恒定速度; 一个实际旋转检测电路（20），它根据实际旋转的检测来提供一个索引信号; 线圈相位选择定时电路（22），用于基于所述检测信号来决定所述线圈相位的选择定时，并且基于所述决定选择定时来提供线圈相位选择信号; 以及微处理器，用于基于旋转参考信号和索引信号之间的相位差来确定PWM信号的脉冲宽度，并且用于与选择线圈相位选择定时同步地提供具有确定的脉冲宽度的PWM控制信号 电路到主轴电机驱动电路。
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公开(公告)号：EP0260138A3
公开(公告)日：1989-05-31
申请号：EP87308010.5
申请日：1987-09-10
Applicant: FUJITSU LIMITED
Inventor： Kohno, Keiichi
CPC classification number: G11B5/59622 , G05B19/19 , G05B2219/37313 , G05B2219/41023 , G05B2219/42032 , G05B2219/42104
Abstract: A servo control system having a coarse control unit (2) and a fine control unit (3) wherein a differential gain is changed temporarily for a short period at an initial state of fine control to shorten a settling time and to reduce overshoot. The servo control system includes a controlled system (1) including a controlled object (12) and a drive unit (13), a unit (2) for controlling a speed of the controlled object to move and position the same to a reference position, and a unit (3) having a differential control circuit and for controlling a position of the controlled object to position the controlled object to the reference position, after the speed control unit (2) has moved the controlled object (12) to a position adjacent to the reference position. A differential gain of the differential control circuit is selected from at least two values, a first of which is used at an initial state and a second of which is used after the initial state. The servo control system is applicable to a disc system, a printer, etc.
Abstract translation: 一种具有粗调控制单元（2）和精控单元（3）的伺服控制系统，其中微调增益在精调控制的初始状态下暂时短时间改变，以缩短稳定时间并减少过冲。 该伺服控制系统包括：包括受控对象（12）和驱动单元（13）的受控系统（1）;用于控制受控对象的速度并将其移动到参考位置的单元（2） 以及具有差动控制电路并且用于在所述速度控制单元（2）已经将所述受控对象（12）移动到与所述受控对象相邻的位置之后控制所述受控对象的位置以将所述受控对象定位到所述参考位置的单元（3） 到参考位置。 从至少两个值中选择差动控制电路的差动增益，其中第一个在初始状态下使用，第二个在初始状态之后使用。 伺服控制系统适用于光盘系统，打印机等。
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