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1.发明授权
公开(公告)号：US4414589A
公开(公告)日：1983-11-08
申请号：US330855
申请日：1981-12-14
CPC分类号： G11B5/5965 , G11B5/012 , G11B5/59616
摘要： A servo track following system for positioning a moving read/write head relative to a magnetic storage disc. A plurality of servo tracks are recorded in sectors on the disc for identifying radial positions or informational tracks. The servo tracks have a nonuniform radial track density varying from more dense at the periphery of the disc to less dense at the interior, established with a method that allows the unique performance characteristics of the head to determine the actual spacing of the tracks. A clock track is written by writing a single pulse on a fixed clock track head, phase-lock looping to an intermediate clock track, which is written on a moving head, and then phase-lock looping up to the final clock track which is written on the fixed clock track head. Radial track density is then determined by moving a head to a limit stop and writing a reference track. Thereafter, the head is displaced an amount sufficient to reduce the amplitude of the reference track by a predetermined percentage which is related to the ultimate average track density. Thereafter, another reference track is written and the head is again stepped away from the second reference track an amount sufficient to again reduce the amplitude of the reference track by a predetermined percentage. This is continued until the disc is filled with reference tracks. If the average track density thus achieved is unsatisfactory, the reduction number is adjusted and the process is repeated. Once the correct reduction number is determined for a predetermined average track density, the servo tracks are written by alternatively writing servo and reference in alternating servo and informational sectors. The reduction number is used to determine the pitch of all tracks.
摘要翻译： 一种用于相对于磁存储盘定位移动的读/写头的伺服跟踪系统。 多个伺服磁道被记录在盘上的扇区中用于识别径向位置或信息轨迹。 伺服轨道具有不均匀的径向轨道密度，从盘的周边处的密度变化到内部的较不密集，通过允许头部的独特性能特性来确定轨道的实际间距的方法来建立。 通过在固定时钟轨道头上写入单个脉冲，将相位锁定循环到写入移动头的中间时钟轨道，然后锁相循环到写入的最后时钟轨迹来写入时钟轨迹 在固定的时钟轨道头上。 然后通过将头移动到限位停止并写入参考轨道来确定径向轨道密度。 此后，头部移动足以使参考轨道的振幅减小与最终平均轨道密度相关的预定百分比的量。 此后，写入另一个参考轨道，并且头部再次从第二参考轨道步行到足以将参考轨道的幅度再次减小预定百分比的量。 这一直持续到光盘充满参考轨。 如果这样实现的平均轨道密度不能令人满意，则调整减少次数并重复该过程。 一旦对于预定的平均轨道密度确定了正确的减小数，则通过在交替的伺服和信息扇区中交替地写入伺服和参考来写入伺服轨迹。 缩小数用于确定所有轨道的间距。
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公开(公告)号：US4063146A
公开(公告)日：1977-12-13
申请号：US579921
申请日：1975-05-22
申请人： Theodore A. Oliver
发明人： Theodore A. Oliver
CPC分类号： H02P7/293 , Y10S388/911 , Y10S388/912 , Y10S388/917
摘要： A digital firing control for a three-phase full wave silicon controlled rectifier converter. An error signal, in digital form, representing a desired change in firing angle which is a function of the difference between the current being supplied by the converter and a desired current, is utilized to advance or retard the firing angle of the SCR's as required to eliminate the error. Each subsequent firing command is referenced on a time basis from the firing command of the previously fired SCR in the firing sequence rather than being referenced from the zero voltage point of the alternating current supply voltage. The error signal is averaged over the time interval between firing commands so that the control responds to the average difference between the current being supplied and the desired current.
摘要翻译： 一种用于三相全波可控硅整流变换器的数字点火控制。 数字形式的误差信号用于表示所需的转换角所需变化，该转换角是由转换器提供的电流与期望电流之间的差值的函数，以根据需要推进或延迟SCR的触发角度 消除错误。 在随后的点火命令中，基于在点火顺序中的先前烧制的SCR的击发命令，而不是从交流电源电压的零电压点引用。 误差信号在发射命令之间的时间间隔内被平均，使得控制响应于所提供的电流与期望电流之间的平均差。
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公开(公告)号：US3947738A
公开(公告)日：1976-03-30
申请号：US510498
申请日：1974-09-30
申请人： Theodore A. Oliver
发明人： Theodore A. Oliver
CPC分类号： H02P7/2825 , H02P7/04 , Y10S388/902 , Y10S388/903 , Y10S388/915
摘要： A reversible control circuit for applying voltage pulses of opposite polarities to a load whereby the average current flowing in the load is a function of the maximum voltage at which the voltage pulses are applied and the duty cycle of the control circuit. The circuit may be utilized to control an electric motor field wherein the motor shunt field winding is connected across a four switch bridge circuit supplied from a direct current or rectified alternating current power source. Current flow in the field winding through a first pair of switches on opposite sides of the bridge can be reversed by opening the first pair of switches and closing the second pair of switches. If the switch pairs are alternately closed and opened in a rapid cyclic manner, the direction and magnitude of the current flow in the field winding can be controlled by varying the duty cycles of the switch pairs.
摘要翻译： 一种用于向负载施加相反极性的电压脉冲的可逆控制电路，由此在负载中流动的平均电流是施加电压脉冲的最大电压和控制电路的占空比的函数。 该电路可以用于控制电动机场，其中电动机并联励磁绕组跨越从直流或整流交流电源供应的四个开关桥电路连接。 通过打开第一对开关并闭合第二对开关可以使通过桥的相对侧上的第一对开关的励磁绕组中的电流流动。 如果开关对交替闭合并以快速循环方式打开，则可以通过改变开关对的占空比来控制励磁绕组中的电流的方向和幅度。
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公开(公告)号：US4019107A
公开(公告)日：1977-04-19
申请号：US546201
申请日：1975-02-03
CPC分类号： H02P7/2985 , Y10S388/903 , Y10S388/906 , Y10S388/93
摘要： A direct current motor control system for generating current command signals to a unidirectional armature controller and a bidirectional field controller. A motor speed command is compared with the actual motor speed to generate a speed error signal. The system generates a current command signal from the average of the speed error signal wherein the current command signal is proportional to the square root of the desired motor torque. The absolute value of the current command signal is the input to the armature controller and the field controller receives the current command signal wherein the polarity of the signal determines the direction of current flow in the field winding for controlling the direction of rotation of the motor.
摘要翻译： 一种用于向单向电枢控制器和双向现场控制器产生电流指令信号的直流电动机控制系统。 将电机速度指令与实际电机速度进行比较，以产生速度误差信号。 系统从速度误差信号的平均值产生电流指令信号，其中电流指令信号与期望的电动机转矩的平方根成比例。 电流指令信号的绝对值是电枢控制器的输入，现场控制器接收电流指令信号，其中该信号的极性决定了用于控制电机旋转方向的励磁绕组中的电流方向。
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5.发明授权
公开(公告)号：US4146910A
公开(公告)日：1979-03-27
申请号：US789528
申请日：1977-04-21
CPC分类号： G11B17/005 , G11B27/10 , H02P23/186
摘要： The specification discloses a method and apparatus for providing speed control and rotational indexing of a disc recorder, based upon a particular use of a plurality of electrical pulses produced, for example, as the slots of a slotted wheel, axially coupled to a recording disc, pass a transducer. The primary repetition rate of pulses in response to equally-spaced slots is used for speed control of the recording disc. A secondary pulse rate occurring between two successive pulses resulting from adjacent slots with different spacing is used to establish an index pulse correlated with a reference point on the disc.
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