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1. 发明授权

US6016043A Method and apparatus for controlling a motor in a disc drive by modulating the commutation angle 失效
标题翻译：通过调制换向角来控制盘驱动器中的电动机的方法和装置
公开(公告)号：US6016043A
公开(公告)日：2000-01-18
申请号：US14756
申请日：1998-01-28
申请人： Andrew R. Motzko , Garry E. Korbel , John M. Baker , Stuart K. Francis
发明人： Andrew R. Motzko , Garry E. Korbel , John M. Baker , Stuart K. Francis
IPC分类号： G11B19/20 , G11B19/28 , H02P6/00 , H02P6/08 , H02P6/18 , G05B1/02
CPC分类号： G11B19/28 , H02P6/34
摘要： A motor control circuit controls a motor in a disc drive is provided. The motor control circuit includes a commutation circuit which provides commutation signals to the motor to commutate the motor at a commutation frequency. A frequency modulation circuit is operably coupled to the commutation circuit. The frequency modulation circuit provides a modulation signal which frequency modulates the commutation frequency according to a predetermined pattern.
摘要翻译：提供了控制盘驱动器中的电动机的电动机控制电路。电动机控制电路包括换向电路，其向电动机提供换向信号，以换向频率换向电动机。频率调制电路可操作地耦合到换向电路。频率调制电路提供根据预定模式对换流频率进行频率调制的调制信号。

2. 发明授权

US06304406B1 Rotational vibration compensation using a fixed head and a constant frequency pattern 失效
标题翻译：使用固定头和恒定频率模式进行旋转振动补偿
公开(公告)号：US06304406B1
公开(公告)日：2001-10-16
申请号：US09216326
申请日：1998-12-18
申请人： D Brent Douglas , Lealon R. McKenzie , Nathaniel B. Wilson , Stuart K. Francis , Arthur J. Clark
发明人： D Brent Douglas , Lealon R. McKenzie , Nathaniel B. Wilson , Stuart K. Francis , Arthur J. Clark
IPC分类号： G11B1546
CPC分类号： G11B25/043 , G11B5/5582 , G11B5/59627 , G11B33/08
摘要： An apparatus and method for minimizing the effects of rotational vibration upon a disc drive having a base deck supporting a rotatable disc and an actuator having a moveable data head. A fixed head is supported over the disc at a predetermined radius and transduces a circumferentially extending frequency pattern written to the disc at a constant frequency to generate a readback signal. A frequency modulation (FM) demodulator generates a rotational velocity signal indicative of application of rotational vibration to the base deck in relation to changes in frequency of the readback signal. A servo circuit controllably positions the moveable data head in response to the rotational velocity signal and servo information readback by the moveable data head. The servo circuit interrupts a data transfer operation between the moveable data head and a host device when a magnitude of the rotational velocity signal exceeds a predetermined threshold. The circumferentially extending frequency pattern is preferably used to clock the writing of the servo information during disc drive manufacturing.
摘要翻译：一种用于最小化旋转振动对具有支撑可旋转盘的基座和具有可移动数据头的致动器的盘驱动器的影响的装置和方法。固定头以预定的半径被支撑在盘上，并且以恒定频率转换写入到盘的周向延伸的频率图案以产生回读信号。频率调制（FM）解调器相对于回读信号的频率变化产生指示向基座施加旋转振动的旋转速度信号。伺服电路响应于可移动数据头的旋转速度信号和伺服信息回读而可控地定位可移动数据头。当旋转速度信号的大小超过预定阈值时，伺服电路中断可移动数据头与主机之间的数据传送操作。圆周延伸的频率图案优选地用于在盘驱动器制造期间对伺服信息的写入进行时钟。

3. 发明授权

US06285522B1 Rotational vibration compensation using a dedicated surface with a constant frequency pattern 失效
标题翻译：使用具有恒定频率图案的专用表面进行旋转振动补偿
公开(公告)号：US06285522B1
公开(公告)日：2001-09-04
申请号：US09215470
申请日：1998-12-18
申请人： Lealon R. McKenzie , D. Brent Douglas , Nathaniel B. Wilson , Stuart K. Francis
发明人： Lealon R. McKenzie , D. Brent Douglas , Nathaniel B. Wilson , Stuart K. Francis
IPC分类号： G11B5596
CPC分类号： G11B5/59627 , G11B5/5582 , G11B33/08
摘要： An apparatus and method for minimizing the effects of rotational vibration upon a disc drive having first and second heads supported adjacent first and second disc recording surfaces, respectively. A frequency modulation (FM) demodulator generates a rotational velocity signal indicative of application of rotational vibration to the base deck in relation to changes in frequency of a readback signal generated from a circumferentially extending frequency pattern written to the first disc recording surface at a constant frequency. A servo circuit controllably positions the first and second heads in response to servo information stored on the second disc recording surface and the rotational velocity signal from the FM demodulator. The servo circuit further interrupts a data transfer operation between the second disc recording surface and a host device when a magnitude of the rotational velocity signal exceeds a predetermined threshold.
摘要翻译：一种用于最小化旋转振动对具有分别支撑在第一和第二盘记录表面附近的第一和第二磁头的磁盘驱动器的影响的装置和方法。频率调制（FM）解调器产生一个旋转速度信号，该旋转速度信号表示相对于以恒定频率写入到第一盘记录表面的周向延伸的频率图案产生的回读信号的频率变化，向基座提供旋转振动。伺服电路响应于存储在第二盘记录表面上的伺服信息和来自FM解调器的旋转速度信号可控地定位第一和第二磁头。当旋转速度信号的大小超过预定阈值时，伺服电路进一步中断第二盘记录表面和主机设备之间的数据传送操作。

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