公开(公告)号：US20030175018A1

公开(公告)日：2003-09-18

申请号：US10176246

申请日：2002-06-20

申请人： Seagate Technology LLC

发明人： Jeffrey A. Heydt ,  David R. Street

IPC分类号： H02P001/04

CPC分类号： G11B19/28 ,  H02P6/08 ,  H02P6/182 ,  H02P6/22 ,  Y10S388/911

摘要： Method and apparatus for accelerating a motor from an intermediate velocity to a final operational velocity. The motor is accelerated from rest to the intermediate velocity through application of fixed duration drive pulses to the spindle motor. Once the motor reaches the intermediate velocity, commutation circuitry and back electromotive force (bemf) detection circuitry use detected bemf from the motor to electronically commutate the motor to accelerate to the final operational speed. A phase lock oscillator (PLO) attempts to acquire frequency lock for the motor. A control circuit measures the current in the motor to evaluate the effectiveness of the phase lock. If the measured current is found to be above a threshold value, the motor is restarted.

摘要翻译： 用于将电动机从中间速度加速到最终操作速度的方法和装置。 通过对主轴电机施加固定持续时间的驱动脉冲，电机从静止加速到中间速度。 一旦电动机达到中间速度，换向电路和反电动势（bemf）检测电路使用来自电动机的检测到的电动机来电动地将电动机换向加速到最终的运行速度。 锁相振荡器（PLO）试图获取电机的频率锁定。 控制电路测量电机中的电流，以评估锁相的有效性。 如果发现测得的电流高于阈值，则电机重启。

公开(公告)号：US20020167287A1

公开(公告)日：2002-11-14

申请号：US09966673

申请日：2001-09-28

申请人： SEAGATE TECHNOLOGY LLC

发明人： Jeffrey A. Heydt ,  David R. Street

IPC分类号： H02P001/18 ,  H02P003/08 ,  H02P005/06 ,  H02P007/06 ,  H02K023/00

CPC分类号： G11B19/20

摘要： Method and apparatus for accelerating a disc drive spindle motor from rest to a final operational velocity. During a low gear mode, the spindle motor is accelerated from rest to a first velocity through application of fixed duration drive pulses to the spindle motor. A high gear mode is next employed to accelerate the spindle motor from a first velocity to an intermediate velocity. Variable duration drive pulses are applied to the spindle motor each having a duration selected as a percentage of the duration of the most recently detected commutation period of the spindle motor. Once the spindle motor reaches the medium speed, commutation circuitry and back electromotive force (bemf) detection circuitry use detected bemf from the spindle motor to electronically commutate the motor to accelerate to the final operational speed.

摘要翻译： 用于将盘驱动主轴电机从静止加速到最终操作速度的方法和装置。 在低档模式下，通过对主轴电机施加固定持续时间的驱动脉冲，主轴电机从静止状态加速到第一速度。 接下来采用高档模式来将主轴电机从第一速度加速到中间速度。 可变持续时间驱动脉冲被施加到主轴电动机，每个主轴电动机的持续时间选择为最近检测到的主轴电动机的换向周期的持续时间的百分比。 一旦主轴电机达到中等速度，换向电路和反电动势（bemf）检测电路使用来自主轴电机的检测到的电流来电动换向电机加速到最终的运行速度。

公开(公告)号：US20030174429A1

公开(公告)日：2003-09-18

申请号：US10186965

申请日：2002-06-28

申请人： Seagate Technology LLC

发明人： Jeffrey A. Heydt ,  David R. Street

IPC分类号： G11B021/02

CPC分类号： G11B5/6005 ,  G11B19/04 ,  G11B21/21

摘要： Method and apparatus for detecting head landings on a data zone of a data storage disc. A disc drive includes an actuator which controllably positions a head adjacent a disc and nominally retracts the head to a parked position when the drive is deactivated. The actuator moves in response to current applied to an actuator coil immersed in a magnetic field. During disc drive initialization, the disc is accelerated to a velocity sufficient to allow the head to be aerodynamically supported over the disc, and current is passed through the actuator coil to urge the head toward the parked position. The current is monitored to detect generation of a back electromotive force (bemf) voltage induced by movement of the coil. An error condition is logged indicating that an initial position of the head was over a data zone of the disc when bemf voltage is detected.

摘要翻译： 用于检测数据存储盘的数据区上的磁头着陆的方法和装置。 磁盘驱动器包括致动器，该致动器可控制地将磁头邻近磁盘定位，并且在驱动器停用时，将磁头标称地缩回到停放位置。 致动器响应于施加到浸入磁场中的致动器线圈的电流而移动。 在盘驱动器初始化期间，盘被加速到足以允许头被空气动力学地支撑在盘上的速度，并且电流通过致动器线圈以将头朝向停放位置推动。 监测电流以检测由线圈的运动引起的反电动势（bemf）电压的产生。 记录错误条件，指示当检测到bemf电压时，磁头的初始位置超过了磁盘的数据区。

公开(公告)号：US20020171380A1

公开(公告)日：2002-11-21

申请号：US09966383

申请日：2001-09-28

申请人： SEAGATE TECHNOLOGY LLC

发明人： Jeffrey A. Heydt ,  David R. Street

IPC分类号： H02P001/18 ,  H02P003/08 ,  H02P005/06 ,  H02P007/06 ,  H02K023/00

CPC分类号： G11B19/20

摘要： Method and apparatus for initializing a disc drive to bring a spindle motor to a final, operational velocity after a disc drive processor reset condition. The spindle motor is rotated using electronic commutation and back electromotive force (bemf) detection. Upon initialization of the disc drive, a control circuit checks for the presence or absence of detected bemf. The absence of bemf indicates the spindle motor is either at rest or is rotating at a relatively low velocity. In the absence of bemf, the electrical rotational position of the spindle motor is determined, a short braking pulse is applied to the motor, and rotation of the spindle motor is detected in relation to changes in the electrical rotational position. Further breaking pulses are applied until no apparent change in electrical rotational position is detected, after which the spindle motor is accelerated from rest to the final, operational velocity.

摘要翻译： 用于初始化盘驱动器的方法和装置，以便在盘驱动器处理器复位条件之后使主轴电机达到最终的操作速度。 主轴电机使用电子换向和反电动势（bemf）进行旋转。 在盘驱动器初始化时，控制电路检查检测到的bemf是否存在。 没有bemf表示主轴电机处于静止状态或以相对较低的速度旋转。 在没有bemf的情况下，确定主轴电动机的电动旋转位置，将短的制动脉冲施加到电动机，并且相对于电动旋转位置的变化检测主轴电动机的旋转。 施加进一步的断开脉冲，直到没有检测到电动旋转位置的明显变化，然后主轴电机从静止状态加速到最终的运行速度。