公开(公告)号：US5478021A

公开(公告)日：1995-12-26

申请号：US131394

申请日：1993-10-05

申请人： Bruce M. Davis ,  David T. Hoge

发明人： Bruce M. Davis ,  David T. Hoge

IPC分类号： G11B15/66 ,  G11B15/665 ,  G11B15/43

CPC分类号： G11B15/66 ,  G11B15/665

摘要： An apparatus and method for profiling the velocity of a leader block to optimize thread time in a helical scan transport uses a substantially triangular velocity profile. Local changes in acceleration and tape back tension are used to dynamically control the position of the leader block to avoid collisions with guide posts and other transport components adjacent the tape path.

摘要翻译： 用于分析引导块的速度以在螺旋扫描传输中优化螺纹时间的装置和方法使用基本上三角形的速度分布。 使用加速度和带背张力的局部变化来动态地控制引导块的位置，以避免与导轨和与磁带路径相邻的其它传输部件碰撞。

公开(公告)号：US5272572A

公开(公告)日：1993-12-21

申请号：US661488

申请日：1991-02-26

申请人： Alan D. Bradshaw ,  Bruce M. Davis ,  Herschel P. Hall

发明人： Alan D. Bradshaw ,  Bruce M. Davis ,  Herschel P. Hall

IPC分类号： G11B15/087 ,  G11B15/467 ,  G11B20/12 ,  G11B27/032 ,  G11B27/02

CPC分类号： G11B27/032

摘要： An apparatus and method for use in appending data to data that has been previously established on a tape in a helical scan tape recorder that results in the spacing between the appended data and the previously established data being within a defined range. The present invention provides a method for measuring the total delay associated with the write and read circuitry within the recorder and a method and apparatus for using the total delay to initiate the writing of the data to be appended to the previously established data on the tape at the appropriate instant to achieve the desired spacing. An apparatus and method for compensating for inaccuracies in the measured total delay to prevent "creep", i.e., a progressive increase or decrease in the spacing between adjacent data that evidences itself when there are several consecutive appends with the data in each append being established on the record carrier in less than the transient response time of the servo circuitry used to control the relative movement between the device for writing the data on the tape and the tape itself.

摘要翻译： 用于将数据附加到先前在螺旋扫描磁带录像机中的磁带上建立的数据的装置和方法，其导致附加数据与先前建立的数据之间的间隔在限定的范围内。 本发明提供了一种用于测量与记录器内的写入和读取电路相关联的总延迟的方法，以及用于使用总延迟来启动要附加到磁带上先前建立的数据的数据的写入的方法和装置， 适当的瞬间实现所需的间距。 一种用于补偿测量的总延迟中的不精确度以防止“蠕变”的装置和方法，即，当在每个附加中的数据存在若干连续附加时，在相邻数据之间的间隔逐渐增加或减小，这些数据连续追加， 记录载体小于伺服电路的瞬态响应时间，用于控制用于将数据写入磁带和磁带本身的设备之间的相对移动。

公开(公告)号：US5446357A

公开(公告)日：1995-08-29

申请号：US132108

申请日：1993-10-05

申请人： Trace A. Baker ,  Bruce M. Davis ,  Chester L. Rebman

发明人： Trace A. Baker ,  Bruce M. Davis ,  Chester L. Rebman

IPC分类号： G05B19/19 ,  G05B11/18

CPC分类号： G05B19/19 ,  G05B2219/41133

摘要： This improved signal discontinuity compensation method compensates for discontinuity in the relationship between motor position commands received by a motor driver, and motor current signals sent to a motor by the motor driver. A best fit approximation of the signal discontinuity is generated based on median data points which provides resistance to anomalous data points. The compensation is accomplished by adding an offset to specific motor position commands sent to the motor driver based on the best fit approximation. The offset command maximizes accuracy and control over motor motion by avoiding the motor driver's motor current signal discontinuity.

摘要翻译： 这种改进的信号不连续性补偿方法补偿了由电机驱动器接收的电动机位置指令与由电动机驱动器发送到电动机的电动机电流信号之间的不连续性。 基于提供对异常数据点的电阻的中值数据点产生信号不连续性的最佳拟合近似。 通过根据最佳拟合近似将偏移量添加到发送给电动机驱动器的特定电动机位置指令来实现补偿。 偏移命令通过避免电机驱动器的电机电流信号不连续性，最大化精度并控制电机运动。

公开(公告)号：US5325028A

公开(公告)日：1994-06-28

申请号：US37451

申请日：1993-03-26

申请人： Bruce M. Davis

发明人： Bruce M. Davis

IPC分类号： G05B19/23 ,  G11B15/67 ,  G05B11/01

CPC分类号： G11B15/67 ,  G05B19/231 ,  G05B2219/33268 ,  G05B2219/34122 ,  G05B2219/41014

摘要： A system and method for controlling an amount of force supplied by a motor to move an object from an at-rest position is presented. The system comprises a motor controller configured to provide a motor control signal to control the amount of force supplied by the motor, and a position sensor configured to detect an actual position of the object being moved by the motor and to send an actual position signal to the motor controller. The motor control signal supplied by the motor controller controls the motor such that the motor supplies a cubic increase in force on the object to move the object from its at-rest position. The motor controller comprises a profile generator, configured to provide an acceleration profile, a velocity profile and a position profile, and to output a drive signal in response to the position profile, wherein the position profile represents a desired position of the object as a function of time. The position profile is a cubic profile as a function of time. The motor controller further comprises a summer to generate an error signal based on the difference between the desired position and the actual position. The motor controller also includes a compensator to generate the motor control signal in response to the error signal.

摘要翻译： 提出了一种用于控制由马达提供的力以从静止位置移动物体的系统和方法。 该系统包括电动机控制器，其被配置为提供电动机控制信号以控制由电动机提供的力的量;以及位置传感器，被配置为检测由电动机正在移动的物体的实际位置，并将实际位置信号发送到 电机控制器。 由电动机控制器提供的电动机控制信号控制电动机，使得电动机对物体施加立方增加的力，以使物体从其静止位置移动。 马达控制器包括轮廓生成器，其被构造成提供加速度分布，速度分布和位置分布，并且响应于位置分布来输出驱动信号，其中位置分布表示对象作为函数的期望位置 的时间。 位置分布是随时间的函数的三次轮廓。 马达控制器还包括一个加法器，用于基于期望位置和实际位置之间的差产生误差信号。 马达控制器还包括补偿器，用于响应于误差信号产生马达控制信号。

公开(公告)号：US5532583A

公开(公告)日：1996-07-02

申请号：US056625

申请日：1993-05-04

申请人： Bruce M. Davis ,  Steven S. Stetler ,  Chester L. Rebman

发明人： Bruce M. Davis ,  Steven S. Stetler ,  Chester L. Rebman

IPC分类号： G05B19/21 ,  G11B15/67 ,  G01R35/00 ,  G01B7/00 ,  G01B7/14 ,  H01L43/06

CPC分类号： G11B15/67 ,  G05B19/21 ,  G05B2219/37016 ,  G05B2219/37154 ,  G05B2219/37184

摘要： A system and method is provided for positioning a take-up reel in a tape drive unit so that a leader block can be inserted therein. The take-up reel is driven by a motor having a rotatable shaft and a motor controller. A position encoder, mounted on the shaft of the motor, uses a Hall-effect device to generate a Hall voltage signal in response to rotational motion of the motor shaft. The Hall voltage signal is amplified to provide a motor phase signal which is then compared to a reference level (usually zero volts) to generate encoder pulses. The encoder pulses are counted using a counter/state machine to determine a position and direction of rotation of the take-up reel. A feature of this system is that it is calibrated using a processor that determines the DC level of the motor phase signal and subsequently adjusts the motor phase signal so that it is substantially symmetrical about the reference level to which it is compared. The microprocessor accomplishes this by measuring a maximum and a minimum value for the motor phase signal, determining the offset about a DC level of the Hall voltage signal using these measured values, and generating a feedback signal to adjust the DC level of said motor phase signal as desired. This calibration is performed for a fixed period of time and only while the motor shaft is rotating. This ensures that actual maximum and minimum signal values are used for the calibration.

摘要翻译： 提供了一种系统和方法，用于将卷取卷轴定位在带驱动单元中，使得引导块可插入其中。 卷取卷轴由具有可旋转轴的电动机和电动机控制器驱动。 安装在电动机轴上的位置编码器使用霍尔效应装置来产生响应于电动机轴的旋转运动的霍尔电压信号。 霍尔电压信号被放大以提供电动机相位信号，然后将其与参考电平（通常为零伏特）进行比较以产生编码器脉冲。 使用计数器/状态机对编码器脉冲进行计数，以确定卷取卷轴的位置和旋转方向。 该系统的一个特征是使用一个确定电机相位信号的直流电平的处理器进行校准，并随后调整电动机相位信号，使其基本上与其进行比较的参考水平对称。 微处理器通过测量电机相位信号的最大值和最小值来完成此操作，使用这些测量值确定霍尔电压信号的直流电平的偏移，并产生反馈信号以调整所述电动机相位信号的直流电平 如预期的。 该校准仅在电机轴旋转的同时进行一段固定的时间。 这确保了实际的最大和最小信号值用于校准。

公开(公告)号：US4868467A

公开(公告)日：1989-09-19

申请号：US144254

申请日：1988-01-14

申请人： Bruce M. Davis

发明人： Bruce M. Davis

IPC分类号： G01R31/34 ,  H02P6/00

CPC分类号： G01R31/34 ,  H02P6/34

摘要： A driver circuit for a DC brushless motor of unknown characteristics operable to start and test to determine the desired characteristics and therefore to accurately and reliably run the motor.

摘要翻译： 一种具有未知特性的直流无刷电机的驱动电路，可用于启动和测试以确定所需特性，从而精确可靠地运行电机。