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1. 发明授权

US08680799B2 Method and apparatus for applying a commutation advance automatically in a brushless DC motor 有权
标题翻译：在无刷直流电动机中自动应用换向提前的方法和装置
公开(公告)号：US08680799B2
公开(公告)日：2014-03-25
申请号：US13108725
申请日：2011-05-16
申请人： John K. Rote , Seil Oh , Brian L. Schmidt
发明人： John K. Rote , Seil Oh , Brian L. Schmidt
IPC分类号： H02P6/18
CPC分类号： H02P6/182 , H02P6/157
摘要： To achieve peak acoustic and power performance, the coil or applied current should be in phase or substantially aligned with the back electromotive force (back-EMF) voltage. However, there are generally phase differences between the applied current and back-EMF voltage that are induced by the impedance of the brushless DC motor (which can vary based on conditions, such as temperature and motor speed). Traditionally, compensation for these phase differences was provided manually and on an as-needed basis. Here, however, a system and method are provided that automatically perform a commutation advance by incrementally adjusting a drive signal over successive commutation cycles when the applied current and back-EMF voltage are misaligned.
摘要翻译：为了实现峰值声功率性能，线圈或施加电流应与反电动势（反电动势）电压同相或基本对齐。然而，由无刷直流电动机的阻抗引起的施加的电流和反电动势电压之间通常存在相位差（其可以基于诸如温度和电动机速度的条件而变化）。传统上，这些阶段差异的补偿手工提供，并根据需要提供。然而，这里提供了一种系统和方法，当所施加的电流和反电动势电压不对准时，通过在连续换向循环上逐渐调节驱动信号来自动执行换向提前。

2. 发明申请

US20120169264A1 METHOD AND APPARATUS FOR COMMUTATING A BRUSHLESS DC MOTOR 审中-公开
标题翻译：无刷直流电动机的方法和装置
公开(公告)号：US20120169264A1
公开(公告)日：2012-07-05
申请号：US12985090
申请日：2011-01-05
申请人： John K. Rote , Seil Oh
发明人： John K. Rote , Seil Oh
IPC分类号： H02P6/18
CPC分类号： G11B19/28 , H02P6/10 , H02P6/15 , H02P6/182 , H02P6/28
摘要： Traditionally, controllers for brushless, sensorless direct current (DC) motors (in, for example, Hard Disk Drive applications) would use one of the phases of the DC motor to measure a back electromotive force (back-EMF) voltage. This measurement would generally cause a discontinuity in the current waveform for a motor operating at a generally constant rotational speed (i.e., at “run speed”), which would result in poor acoustic performance (i.e., audible hum). Here, however, an integrated circuit (IC) is provided that uses coil current and applied voltage measurements to substantially maintain a predetermined phase difference between the phase of the applied voltage and back-EMF voltage, eliminating the need for a back-EMF voltage measurement and improving the acoustic performance.
摘要翻译：传统上，用于无刷，无传感器直流（DC）电机（例如硬盘驱动器应用）的控制器将使用直流电动机的一个相位来测量反电动势（反电动势）电压。这种测量通常会导致电机波形以不变的速度运行（即“运行速度”），这将导致较差的声学性能（即可听见的嗡嗡声）。然而，这里提供了一种集成电路（IC），其使用线圈电流和施加的电压测量来基本上保持所施加的电压和反电动势电压的相位之间的预定的相位差，从而消除了对反电动势电压测量的需要并提高声学性能。

3. 发明申请

US20120293098A1 METHOD AND APPARATUS FOR APPLYING A COMMUTATION ADVANCE AUTOMATICALLY IN A BRUSHLESS DC MOTOR 有权
标题翻译：在无刷直流电动机中自动预报的方法和装置
公开(公告)号：US20120293098A1
公开(公告)日：2012-11-22
申请号：US13108725
申请日：2011-05-16
申请人： John K. Rote , Seil Oh , Brian L. Schmidt
发明人： John K. Rote , Seil Oh , Brian L. Schmidt
IPC分类号： H02P6/18
CPC分类号： H02P6/182 , H02P6/157
摘要： To achieve peak acoustic and power performance, the coil or applied current should be in phase or substantially aligned with the back electromotive force (back-EMF) voltage. However, there are generally phase differences between the applied current and back-EMF voltage that are induced by the impedance of the brushless DC motor (which can vary based on conditions, such as temperature and motor speed). Traditionally, compensation for these phase differences was provided manually and on an as-needed basis. Here, however, a system and method are provided that automatically perform a commutation advance by incrementally adjusting a drive signal over successive commutation cycles when the applied current and back-EMF voltage are misaligned.
摘要翻译：为了实现峰值声功率性能，线圈或施加电流应与反电动势（反电动势）电压同相或基本对齐。然而，由无刷直流电动机的阻抗引起的施加的电流和反电动势电压之间通常存在相位差（其可以基于诸如温度和电动机速度的条件而变化）。传统上，这些阶段差异的补偿手工提供，并根据需要提供。然而，这里提供了一种系统和方法，当所施加的电流和反电动势电压不对准时，通过在连续换向循环上逐渐调节驱动信号来自动执行换向提前。

4. 发明授权

US07243058B1 Method and circuit for operating a voice coil actuator of a mass data storage device 有权
标题翻译：用于操作大容量数据存储装置的音圈致动器的方法和电路
公开(公告)号：US07243058B1
公开(公告)日：2007-07-10
申请号：US09464315
申请日：1999-12-16
申请人： Tan Du , John K. Rote
发明人： Tan Du , John K. Rote
IPC分类号： G11B5/55 , G11B21/08 , G06F19/00 , G05B5/01 , G06B7/62
CPC分类号： G11B5/5526 , H02P25/034
摘要： A circuit (90) and method are presented to accurately determine a BEMF voltage of a VCM coil (20) after termination of a driving current in a first current direction in the coil (20). The circuit includes a circuit for activating selected VCM coil driver transistors (44–47) to apply a current to the coil (20) in a direction opposite the first current direction to generate a magnetic field to oppose eddy currents established in structures adjacent the coil (20) by the driving current. The time that the eddy current opposing current may be applied may be determined, for example, by determining a magnitude of the original current command, a time that the coil spends in flyback, or a magnitude of the original driving current, and adjusting the time of application of the eddy current opposing current accordingly.
摘要翻译：呈现电路（90）和方法以在线圈（20）中的第一电流方向上的驱动电流终止之后，准确地确定VCM线圈（20）的BEMF电压。电路包括用于激活所选择的VCM线圈驱动晶体管（44-47）的电路，以在与第一电流方向相反的方向上向线圈（20）施加电流，以产生磁场，以对抗在线圈附近的结构中建立的涡流（20）由驱动电流。可以应用涡电流相对电流的时间可以例如通过确定原始电流指令的大小，线圈在反激时花费的时间或原始驱动电流的大小以及调整时间来确定相应地应用涡流相对电流。

5. 发明授权

US6040671A Constant velocity control for an actuator using sampled back EMF control 有权
标题翻译：使用采样反电动势控制的执行器的恒速控制
公开(公告)号：US6040671A
公开(公告)日：2000-03-21
申请号：US239188
申请日：1999-01-28
申请人： Joao Carlos F. Brito , John K. Rote , Frederick W. Trafton , Marcus M. Martins
发明人： Joao Carlos F. Brito , John K. Rote , Frederick W. Trafton , Marcus M. Martins
IPC分类号： H02P6/18 , H02K23/00 , H02P1/04
CPC分类号： H02P6/182 , Y10S388/912
摘要： An apparatus for controlling an actuator having a moveable member and having a coil that influences movement of the member, by provision of a drive current to the coil in response to a target speed voltage signal. The invention includes an up/down counter, counting at a predetermined count rate and providing a count output. A control unit is provided for controlling the direction of count of the up/down counter depending on whether the voltage across the coil, sensed periodically a first predetermined interval after the drive current to the coil is interrupted, is greater than, or less than, a reference voltage having a predetermined relationship to the target speed voltage. A digital-to-analog converter is provided, responsive to the count output to provide a compensated voltage signal having a voltage corresponding to the count output. A voltage sensing and holding unit is provided that periodically, after the drive current is interrupted for a second predetermined interval, senses and holds a sample voltage corresponding to the voltage across the coil. A plus/minus indicator is provided that senses when the up/down counter is in a down count direction and is at a count of zero, and in response thereto changes between a plus state and a minus state. A switch node is provided, combining the sample voltage signal with the compensated voltage signal to produce a command voltage signal, and providing the command voltage signal with a polarity controlled by the state of the plus/minus indicator. Finally, a transconductance amplifier unit is provided, receiving the command voltage signal and providing the drive current to the coil in a direction determined by the state of the plus/minus indicator.
摘要翻译：一种用于通过响应于目标速度电压信号向线圈提供驱动电流来控制具有可移动部件并具有影响部件运动的线圈的致动器的装置。本发明包括一个向上/向下计数器，以预定的计数速率计数并提供计数输出。提供控制单元，用于根据在线圈的驱动电流被中断之后周期性地感测到第一预定间隔的线圈两端的电压是否大于或小于第一预定间隔，来控制向上/向下计数器的计数方向，与目标速度电压具有预定关系的参考电压。提供数模转换器，响应于计数输出以提供具有对应于计数输出的电压的补偿电压信号。提供电压感测和保持单元，其在驱动电流中断第二预定间隔之后周期性地感测并保持对应于线圈两端的电压的采样电压。提供加/减指示器，其感测何时升/降计数器处于向下计数方向并且处于零计数，并且响应于此在正状态和负状态之间改变。提供了一个开关节点，将采样电压信号与补偿的电压信号相结合，产生一个指令电压信号，并为正/负指示器的状态控制极性提供指令电压信号。最后，提供跨导放大器单元，接收指令电压信号并且在由加/减指示器的状态确定的方向上向线圈提供驱动电流。

6. 发明授权

US06373208B1 System for voltage regulation of a voice coil motor 有权
标题翻译：音圈电机调压系统
公开(公告)号：US06373208B1
公开(公告)日：2002-04-16
申请号：US09300346
申请日：1999-04-27
申请人： Joao Carlos Felicio Brito , Frederick W. Trafton , John K. Rote
发明人： Joao Carlos Felicio Brito , Frederick W. Trafton , John K. Rote
IPC分类号： H02P312
CPC分类号： H02P25/034
摘要： A method is disclosed for controlling the voltage applied to a voice coil motor coil during the retract operations of a mass storage device, comprising a combination of three different voltage regulator stages. This method includes providing a first circuitry stage adapted to source current to a voice coil motor apparatus, raising the voltage across the voice coil motor to a desired level, providing a second circuitry stage adapted to draw current from the voice coil motor effecting a desired voltage across the voice coil motor, and providing a third circuitry stage adapted to raise the voltage of the voice coil motor to ground by effectively shorting the voice coil motor to ground.
摘要翻译：公开了一种用于控制在大容量存储装置的缩回操作期间施加到音圈电机线圈的电压的方法，其包括三个不同的电压调节器级的组合。该方法包括提供第一电路级，其适于将电流馈送到音圈电动机装置，将音圈电动机两端的电压提高到期望的电平，从而提供第二电路级，适用于从音圈电动机中抽出电流来实现期望的电压并且提供第三电路级，其适于通过有效地使音圈电机短接地将音圈电机的电压升高到地。

7. 发明授权

US06184645B2 Voltage mode drive for control circuit for an actuator using sampled back EMF control 有权
公开(公告)号：US06184645B2
公开(公告)日：2001-02-06
申请号：US09388508
申请日：1999-09-02
申请人： Joao Carlos F. Brito , John K. Rote , Robert E. Whyte, Jr.
发明人： Joao Carlos F. Brito , John K. Rote , Robert E. Whyte, Jr.
IPC分类号： G05D23275
CPC分类号： G11B5/59605
摘要： An apparatus for controlling an actuator in response to a target speed voltage signal, the actuator having a moveable member and having a coil that influences movement of the member. A first summing node is provided having a control output voltage, for summing or subtracting voltages applied thereto, as the case may be and receiving the target speed voltage signal at a first, summing input thereto. A proportional compensation unit is provided, receiving the control output voltage and providing as an output a proportionally compensated output signal. An integral compensation unit is provided, receiving the control output voltage and providing as an output an integrally compensated output signal. An inverse compensation unit is provided, receiving the target speed voltage signal as an input and providing an inversely compensated output signal having a voltage corresponding to the voltage of the target speed voltage signal multiplied by the inverse of a predetermined amplification factor. A second summing node is provided, receiving the proportionally compensated output signal, the integrally compensated output signal and the inversely compensated output signal, and having a command output signal corresponding to the sum of the input signals. An amplifier is provided, receiving the command output signal and having a drive output signal for driving the actuator. Finally, a sense unit is provided for sensing a back-EMF of the actuator and providing a voltage corresponding to the sensed back-EMF to a second, subtracting input of the first summing node, such that the control output voltage corresponds to the difference between the target speed voltage and the sensed back-EMF. The inversely compensated output signal substantially provides a voltage to the amplifier sufficient to cause the amplifier to provide the drive output signal at a voltage corresponding to the voltage of the target speed voltage signal.

8. 发明授权

US06998799B2 System and method for improved motor control 有权
标题翻译：改进电机控制的系统和方法
公开(公告)号：US06998799B2
公开(公告)日：2006-02-14
申请号：US10260978
申请日：2002-09-30
申请人： John K. Rote , Tanchu Shih , Bertram J. White
发明人： John K. Rote , Tanchu Shih , Bertram J. White
IPC分类号： H02K23/00
CPC分类号： H02P6/10 , H02P6/14
摘要： A system and method of motor control enable improved motor control by controlling a phase winding to float or enter a high impedance state prior to activating phase detection of the phase winding. Because the phase winding floats prior to phase detection, the effect residual current coupling in such phase can be mitigated and thereby help improve motor operation.
摘要翻译：电动机控制的系统和方法通过在激励相绕组的相位检测之前控制相绕组浮动或进入高阻抗状态来改善电机控制。由于在相位检测之前相绕组浮动，所以可以减轻在这种相位下的剩余电流耦合效应，从而有助于改善电机运行。

9. 发明授权

US06721119B1 System and method for controlling an actuator motor during retract 有权
标题翻译：缩回时控制执行器电机的系统和方法
公开(公告)号：US06721119B1
公开(公告)日：2004-04-13
申请号：US09640214
申请日：2000-08-16
申请人： Mehedi Hassan , Joao Carlos Brito , John K. Rote
发明人： Mehedi Hassan , Joao Carlos Brito , John K. Rote
IPC分类号： G11B2102
CPC分类号： G11B19/20 , G11B5/5526 , G11B21/12
摘要： A system and method are provided for controlling operation of an actuator for retracting a read/write head of a hard disk drive system. One aspect of the system and method relates to controlling the actuator in response to a retract request command by first decelerating the actuator for a time period and then braking of the actuator for another time period. Another aspect of the system and method relates to controlling operation of the actuator during retract based on a sensed back EMF relative to a target back EMF, which may be selected by a user.
摘要翻译：提供了一种用于控制用于缩回硬盘驱动器系统的读/写头的致动器的操作的系统和方法。该系统和方法的一个方面涉及通过首先使致动器减速一段时间，然后再次制动致动器另一时间段来响应于回缩请求命令来控制致动器。该系统和方法的另一方面涉及基于相对于目标反电动势的感测的反电动势来控制在缩回期间致动器的操作，其可以由用户选择。

10. 发明授权

US06204629B1 Method and apparatus for accurately measuring a back-emf voltage on an actuator coil 有权
标题翻译：用于精确测量致动器线圈上的反电动势电压的方法和装置
公开(公告)号：US06204629B1
公开(公告)日：2001-03-20
申请号：US09193803
申请日：1998-11-17
申请人： John K. Rote , Lindian Wayne Reynolds, Jr.
发明人： John K. Rote , Lindian Wayne Reynolds, Jr.
IPC分类号： H02P506
CPC分类号： G11B5/5526
摘要： An actuator (12) has a movable member (20), and has a coil (26) which can be controlled to urge the member to move. In a particular mode of operation, a driver circuit (70) is periodically uncoupled from the coil so that the current through the coil goes to zero, after which the back-emf voltage of the coil is applied to a capacitor (94). Then, the driver circuit is recoupled to the coil, and the voltage held by the capacitor is used to effect feedback control of the driver circuit for the coil.
摘要翻译：致动器（12）具有可动构件（20），并且具有能够被控制以推动构件移动的线圈（26）。在特定操作模式中，驱动器电路（70）周期性地与线圈分离，使得通过线圈的电流变为零，之后将线圈的反电动势电压施加到电容器（94）。然后，将驱动器电路重新耦合到线圈，并且使用由电容器保持的电压来实现用于线圈的驱动器电路的反馈控制。

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