公开(公告)号：US07113365B1

公开(公告)日：2006-09-26

申请号：US10329127

申请日：2002-12-24

申请人： Robert P. Ryan ,  Alan P. Rice ,  Jon E. Jacoby

发明人： Robert P. Ryan ,  Alan P. Rice ,  Jon E. Jacoby

IPC分类号： G11B19/20

CPC分类号： G11B19/2009 ,  H02K1/146 ,  H02K1/187 ,  H02K1/2786 ,  H02K5/1732 ,  H02K11/01 ,  H02K11/022 ,  H02K21/22

摘要： A disk drive is disclosed comprising a disk, a head actuated over a surface of the disk, and a spindle motor for rotating the disk. The spindle motor comprises a ring-shaped stator having a plurality of stator teeth each wound with a winding. The spindle motor further comprises a hub having a plurality of magnets for interacting with the stator teeth to rotate the hub about the shaft when the windings are energized. A ring-shaped shield is disposed in a vertical gap between the windings and the hub to reduce a voltage coupled from the windings to the surface of the disk.

摘要翻译： 公开了一种磁盘驱动器，包括盘，在盘的表面上致动的头和用于旋转盘的主轴电机。 主轴电动机包括具有多个定子齿的环形定子，每个定子齿缠绕有绕组。 主轴电动机还包括具有多个磁体的轮毂，用于与定子齿相互作用以在绕组被通电时围绕轴旋转轮毂。 环形屏蔽设置在绕组和轮毂之间的垂直间隙中以减小从绕组耦合到盘的表面的电压。

公开(公告)号：US08610391B1

公开(公告)日：2013-12-17

申请号：US13172719

申请日：2011-06-29

申请人： Wenli Yang ,  Philip Tin Yue Ng ,  Ashok K. Desai ,  Robert P. Ryan

发明人： Wenli Yang ,  Philip Tin Yue Ng ,  Ashok K. Desai ,  Robert P. Ryan

IPC分类号： H02K21/00 ,  H02K23/00

CPC分类号： H02P6/22 ,  H02P6/08 ,  H02P6/182

摘要： A disk drive is disclosed comprising a head actuated over a disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. During a spin-up operation a sinusoidal driving voltage is applied to each winding of the spindle motor. A back electromotive force (BEMF) voltage generated by at least one of the windings is measured, and a rotation speed of the spindle motor is measured. The sinusoidal driving voltage is adjusted in order to optimize a lead angle relative to the rotation speed, wherein the lead angle represents a degree the sinusoidal driving voltage leads the BEMF voltage.

摘要翻译： 公开了一种磁盘驱动器，包括在盘上驱动的磁头和用于旋转磁盘的主轴电机，主轴电动机包括多个绕组。 在起动操作期间，正弦驱动电压被施加到主轴电动机的每个绕组。 测量由至少一个绕组产生的反电动势（BEMF）电压，并且测量主轴电动机的转速。 调整正弦驱动电压以便相对于转速优化引导角，其中引导角表示正弦驱动电压引导BEMF电压的程度。

公开(公告)号：US07907364B2

公开(公告)日：2011-03-15

申请号：US12201571

申请日：2008-08-29

申请人： William B. Boyle ,  Robert P. Ryan

发明人： William B. Boyle ,  Robert P. Ryan

IPC分类号： G11B19/04 ,  G11B15/08 ,  G11B21/02

CPC分类号： G11B5/09

摘要： A disk drive including a delay circuit to provide a delayed reset signal is disclosed. The disk drive includes a head to perform write and read operations to and from a disk and a disk controller that is coupled to the head to control the write and read operations performed by the head. The disk drive further includes: a power loss detection circuit to detect a power loss and to generate a reset signal in response to the power loss; a reset power line coupled to the disk controller and the power loss detection circuit to provide a non-delayed reset signal to the disk controller; and a delay circuit coupled to the reset power line wherein the delay circuit delays the reset signal to provide a delayed reset signal.

摘要翻译： 公开了一种包括提供延迟复位信号的延迟电路的磁盘驱动器。 磁盘驱动器包括用于对磁盘执行写入和读取操作的磁头以及耦合到磁头的磁盘控制器，以控制由磁头执行的写入和读取操作。 磁盘驱动器还包括：功率损耗检测电路，用于检测功率损耗并响应于功率损耗产生复位信号; 耦合到盘控制器和功率损耗检测电路的复位电源线，以向盘控制器提供未延迟的复位信号; 以及耦合到所述复位电源线的延迟电路，其中所述延迟电路延迟所述复位信号以提供延迟的复位信号。

公开(公告)号：US07158329B1

公开(公告)日：2007-01-02

申请号：US11134917

申请日：2005-05-23

申请人： Robert P. Ryan

发明人： Robert P. Ryan

IPC分类号： G11B15/46 ,  G11B15/48 ,  H02P1/00

CPC分类号： G11B19/20 ,  G11B19/2063 ,  H02P6/24

摘要： A disk drive is disclosed comprising a disk, a head actuated over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings. Disk control circuitry executes a spin-down operation of the spindle motor by estimating an angular position of the spindle motor by applying a voltage to at least one of the windings and evaluating a rise time of current flowing through the winding. The windings are commutated in response to the estimated angular position, and a driving current is applied to the windings to brake the spindle motor.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，在盘上致动的头和用于旋转盘的主轴电机，所述主轴电机包括多个绕组。 磁盘控制电路通过对至少一个绕组施加电压并评估流过绕组的电流的上升时间来估计主轴电动机的角位置来执行主轴电动机的减速操作。 绕组根据估计的角度位置进行换向，并向绕组施加驱动电流以制动主轴电动机。

公开(公告)号：US07095579B1

公开(公告)日：2006-08-22

申请号：US11143839

申请日：2005-06-02

申请人： Robert P. Ryan ,  Ashok K. Desai ,  Hemant Melkote ,  Jenghung Chen ,  John R. Agness ,  Terry C. Dawson

发明人： Robert P. Ryan ,  Ashok K. Desai ,  Hemant Melkote ,  Jenghung Chen ,  John R. Agness ,  Terry C. Dawson

IPC分类号： G11B21/02

CPC分类号： G11B21/12

摘要： A disk drive is discloses comprising a disk, a head connected to a distal end of an actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot in order to actuate the head radially over the disk. If when a power failure occurs the radial location of the head is less than a predetermined distance from the outer diameter of the disk, the VCM is controlled to move the head toward the inner diameter of the disk and stopping the head before it reaches the inner diameter of the disk. The VCM is then controlled to move the head toward the outer diameter of the disk until the actuator arm unloads onto a ramp.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，连接到致动器臂的远端的头部和用于围绕枢轴旋转致动器臂的音圈电动机（VCM），以便在盘上径向驱动头部。 如果当电源故障发生时，磁头的径向位置小于距离磁盘外径的预定距离，则控制VCM使磁头向盘的内径移动并在磁头到达内部之前停止磁头 磁盘的直径。 然后控制VCM以使头朝向盘的外径移动，直到致动器臂卸载到斜坡上。

公开(公告)号：US08179626B1

公开(公告)日：2012-05-15

申请号：US12631716

申请日：2009-12-04

申请人： Robert P. Ryan ,  Don Brunnett ,  Alain Chahwan ,  Duc T. Phan

发明人： Robert P. Ryan ,  Don Brunnett ,  Alain Chahwan ,  Duc T. Phan

IPC分类号： G11B27/36

CPC分类号： G11B5/5582 ,  G11B19/042

摘要： Adaptive shock detection systems are provided according to various embodiments of the present invention. In one embodiment, an adaptive shock detection system comprises a shock sensing circuit, and a controller configured to receive shock detection signals from the shock sensing circuit and to dynamically adjust a sensitivity of the shock sensing circuit based the received shock detection signals.

摘要翻译： 根据本发明的各种实施例提供自适应冲击检测系统。 在一个实施例中，自适应冲击检测系统包括冲击检测电路和被配置为从冲击感测电路接收冲击检测信号并且基于所接收的冲击检测信号动态地调整冲击感测电路的灵敏度的控制器。

公开(公告)号：US07573670B1

公开(公告)日：2009-08-11

申请号：US11862825

申请日：2007-09-27

申请人： Robert P. Ryan ,  Terry C. Dawson ,  Ashok K. Desai

发明人： Robert P. Ryan ,  Terry C. Dawson ,  Ashok K. Desai

IPC分类号： G11B21/02

CPC分类号： G11B21/12

摘要： A disk drive is disclosed including a disk having a plurality of tracks, wherein each track comprises a plurality of embedded servo sectors. A head connected to a distal end of an actuator arm is rotated about a pivot by a voice coil motor (VCM) in order to actuate the head radially over the disk. The actuator arm is unloaded onto a ramp by seeking the head to a track near an outer diameter of the disk in response to the embedded servo sectors, switching to a velocity control mode to unload the actuator arm onto the ramp at a controlled unload velocity in response to a back electromotive force voltage generated by the VCM, and ramping a velocity command so that the velocity of the actuator arm when contacting the ramp is less than half the maximum unload velocity while traveling along the ramp.

摘要翻译： 公开了一种磁盘驱动器，其包括具有多个磁道的磁盘，其中每个磁道包括多个嵌入式伺服扇区。 连接到致动器臂的远端的头部通过音圈电机（VCM）围绕枢轴旋转，以便在磁盘上径向驱动头部。 通过响应于嵌入的伺服扇区，将头部附接到盘的外径附近的轨道，将执行器臂卸载到斜坡上，切换到速度控制模式，以将控制的卸载速度卸载到斜坡上 响应于由VCM产生的反电动势电压，以及斜坡速度命令，使得当接触斜坡时致动器臂的速度小于沿斜坡行进的最大卸载速度的一半。

公开(公告)号：US06795268B1

公开(公告)日：2004-09-21

申请号：US09704195

申请日：2000-10-31

申请人： Robert P. Ryan

发明人： Robert P. Ryan

IPC分类号： G11B5596

CPC分类号： G11B5/5547 ,  G11B5/59605

摘要： A disk drive is disclosed comprising a disk, a head, an actuator arm for actuating the head radially over the disk during a seek operation, and a voice coil motor (VCM) for rotating the actuator arm about a pivot, the VCM comprising a coil comprising a VCM resistance R. A back EMF voltage detector measures a back EMF voltage across the coil, and a current detector detects a current I flowing through the coil. An IR voltage detector, responsive to the current I detected by the current detector, detects an IR voltage proportional to the current I times the VCM resistance R. A voltage compensator substantially cancels the IR voltage from the measured back EMF voltage to generate a compensated back EMF voltage. A control voltage generator, responsive the compensated back EMF voltage, generates a control voltage applied to the coil to generate the current I flowing through the coil. A memory stores a first compensated back EMF voltage generated at a first time period of the seek operation. A comparator compares the first compensated back EMF voltage stored in the memory to a second compensated back EMF voltage generated at a second time period of the seek operation. A calibrator, responsive to the comparator, calibrates the IR voltage detector.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，头，用于在寻道操作期间在盘上径向驱动头的致动器臂，以及用于使致动器臂围绕枢轴旋转的音圈电机（VCM），VCM包括线圈 包括VCM电阻R.反电动势电压检测器测量线圈两端的反电动势电压，电流检测器检测流过线圈的电流I。 IR电压检测器响应于电流检测器检测到的电流I，检测与电流I成比例的IR电压。电压补偿器基本上从测量的反电动势电压中消除IR电压，以产生补偿后的 EMF电压。 响应补偿的反电动势电压的控制电压发生器产生施加到线圈的控制电压以产生流过线圈的电流I。 存储器存储在寻道操作的第一时间周期产生的第一补偿反向EMF电压。 比较器将存储在存储器中的第一补偿反向EMF电压与在寻道操作的第二时间周期产生的第二补偿反向EMF电压进行比较。 校准器响应比较器，校准IR电压检测器。

公开(公告)号：US06549359B1

公开(公告)日：2003-04-15

申请号：US09585805

申请日：2000-05-31

申请人： George J. Bennett ,  Robert P. Ryan

发明人： George J. Bennett ,  Robert P. Ryan

IPC分类号： G11B1518

CPC分类号： G11B19/22 ,  G11B5/54

摘要： A disk drive is disclosed comprising a disk, a head actuated radially over the disk, and a spindle motor for rotating the disk, the spindle motor comprising a plurality of windings and a rotor rotatable at a variable spin rate, wherein the rotor generates a back EMF (BEMF) voltage across the windings proportional to the spin rate of the rotor. A plurality of switching elements are coupled to the windings, and switch control logic generates switch control signals applied to the switching elements for commutating the spindle motor during normal operation and for generating an internal supply voltage from the BEMF during a spin down mode, the internal supply voltage for parking the head. A signal generator generates a periodic signal, the periodic signal for periodically grounding the windings during the spin down mode in order to boost the internal supply voltage, wherein grounding the windings applies a braking torque to the spindle motor. A plurality of current detectors is provided, wherein each current detector for measuring a current flowing through a respective one of the switching elements. A current limit circuit generates a control signal which prevents the periodic signal from grounding the windings if the current flowing through any one of the switching elements exceeds a predetermined threshold.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，位于盘上径向驱动的磁头和用于旋转磁盘的主轴电机，主轴电动机包括多个绕组和可旋转的可转动速度的转子，其中转子产生一个后部 绕组的EMF（BEMF）电压与转子的旋转速率成比例。 多个开关元件耦合到绕组，并且开关控制逻辑产生施加到开关元件的开关控制信号，用于在正常操作期间使主轴电机换向，并且在旋转下降模式期间产生来自BEMF的内部电源电压，内部 供电电压停放头。 信号发生器产生周期信号，周期信号用于在下降模式期间周期性地接地绕组，以便提升内部电源电压，其中绕组接地对主轴电机施加制动转矩。 提供多个电流检测器，其中每个电流检测器用于测量流过相应的一个开关元件的电流。 如果流过任何一个开关元件的电流超过预定阈值，则限流电路产生控制信号，该控制信号防止周期信号接地绕组。

公开(公告)号：US06198590B1

公开(公告)日：2001-03-06

申请号：US09120854

申请日：1998-07-21

申请人： Raffi Codilian ,  Terry C. Dawson ,  Carl R. Messenger ,  Steven Nemshick ,  Robert P. Ryan

发明人： Raffi Codilian ,  Terry C. Dawson ,  Carl R. Messenger ,  Steven Nemshick ,  Robert P. Ryan

IPC分类号： G11B1546

CPC分类号： G11B19/20

摘要： A disk drive employs a method of operating a spindle motor to respond to a spin-down command to reduce the time required for subsequently responding to a spin-up command. After receiving the spin-down command, and while the rotor continues to spin in the forward-spin direction, a state machine is set to and maintained in a first predetermined register state such that a controlled rotor-stopping operation is performed. At the end of the controlled rotor-stopping operation, the rotor angle is within the range of a peaked forward direction waveform for a second predetermined register state of the state machine.

摘要翻译： 磁盘驱动器采用操作主轴电机以响应减速命令的方法，以减少随后响应旋转命令所需的时间。 在接收到旋转命令之后，并且当转子继续向前旋转方向旋转时，状态机被设置并保持在第一预定的寄存器状态，从而执行受控的转子停止操作。 在受控转子停止运转结束时，转子角度在状态机的第二预定寄存器状态的峰值正向波形的范围内。