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1. 发明授权

US4523240A High precision floppy disc memory system 失效
公开(公告)号：US4523240A
公开(公告)日：1985-06-11
申请号：US42721
申请日：1979-05-25
申请人： Ericson M. Dunstan , William J. Gervais , S. Barry McClelland
发明人： Ericson M. Dunstan , William J. Gervais , S. Barry McClelland
IPC分类号： G11B5/016 , G11B5/55
CPC分类号： G11B5/5521 , G11B5/016
摘要： A "floppy" disc digital magnetic storage apparatus or subsystem includes a number of interrelated features permitting greatly increased data storage and good access time, while using relatively inexpensive parts. The features contributing to the greatly increased storage capacity include arrangements for providing one hundred tracks per inch, and for holding tolerances so that the position of the magnetic head in the radial direction is maintained within the required value of plus or minus 1.7 thousandths of an inch. Features contributing to the high accuracy of magnetic head positioning, and the resultant high data capacity, include the following: (1) mounting the lead screw which positions the magnetic head with its inner end close to the center of the magnetic disc fixed in position, and with its outer end and the stepping motor secured to it mounted on a leaf spring pushing the motor and the outer end of the lead screw inward toward the inner end of the lead screw: (2) utilizing a simple sheet metal stepper motor having two sets of punched metal teeth which interfit with one another and which are exposed to a central permanently magnetized rotor having north and south poles successively located around its periphery; two coils are provided and each of these coils can be energized in opposite directions, with the four combinations resulting in progressive stepping of the permanent magnetic armature, with every fourth step having a more accurately defined angular position than the three intermediate steps; (3) by a special energization arrangement, the rotor is moved four steps at a time to shift the head from one track to the next, thereby using only the more accurately located angular positions, and reducing the adverse effects of friction on head positioning; (4) the electronic circuitry associated with driving the step motor is configured to offset any time penalty incurred by taking four steps to move one track; (5) the floppy disc is accurately positioned relative to the inner end of the lead screw by forcing the magnetic disc to an interference fit relationship with the driving spindle hub on which it is mounted, and (6) the lead screw is ground to mate with a conical pin secured to the movable head assembly.

2. 发明授权

US4947093A Shock resistant winchester disk drive 失效
标题翻译：耐冲击硬化盘驱动器
公开(公告)号：US4947093A
公开(公告)日：1990-08-07
申请号：US276299
申请日：1988-11-25
申请人： Ericson M. Dunstan , Dennis Hogg , John E. Scura , Ming-Goei Sheu
发明人： Ericson M. Dunstan , Dennis Hogg , John E. Scura , Ming-Goei Sheu
IPC分类号： G11B5/55 , G11B7/09
CPC分类号： G11B7/0946 , G11B5/5582
摘要： A shock resistant hard disk drive system employs a plurality of magnetic disks for recording data, a plurality of magnetic heads for performing input/output operation on the magnetic disks, with at least one of the magnetic heads being used as a servo head, a head-positioning mechanism for controlling the movement of the magnetic heads, a servo control mechanism or servo loop for opposing shifts in the location of the servo head, detecting device for detecting and measuring certain accelerations applied to the system, and filtering device for filtering the output of said detecting device and for providing the signal to the head-positioning mechanism. The detecting device detects and measures the magnitude of internal or external accelerations or shocks applied to the system, and provides the necessary signals to counter such accelerations. The pre-existing phase locked loop includes a voltage controlled oscillator, with the voltage control signal applied to the oscillator indicating instantaneous rotational velocity resulting from accelerations applied to the system; and this control signal is modified and applied to servo loop for the head positioner, to hold the head positioner against shifting off track.
摘要翻译：抗冲击硬盘驱动系统采用多个用于记录数据的磁盘，用于在磁盘上进行输入/输出操作的多个磁头，其中至少一个磁头用作伺服磁头，磁头用于控制磁头移动的定位机构，伺服控制机构或伺服环路，用于伺服头位置的相对位移，用于检测和测量施加到系统的某些加速度的检测装置，以及用于过滤输出的过滤装置并且用于将信号提供给头部定位机构。检测装置检测和测量施加到系统的内部或外部加速度或冲击的大小，并提供必要的信号来对抗这种加速度。预先存在的锁相环包括压控振荡器，电压控制信号施加到振荡器，指示由施加到系统的加速度引起的瞬时旋转速度; 并且该控制信号被修改并应用于头部定位器的伺服环路，以保持头部定位器不偏离轨道。

3. 发明授权

US4329604A Low loss brushless DC motor 失效
标题翻译：低损耗无刷直流电机
公开(公告)号：US4329604A
公开(公告)日：1982-05-11
申请号：US63856
申请日：1979-08-06
申请人： Ericson M. Dunstan , William J. Gervais , Bipin V. Gami
发明人： Ericson M. Dunstan , William J. Gervais , Bipin V. Gami
IPC分类号： G11B19/20 , H02K29/10 , H02K11/00
CPC分类号： G11B19/20 , H02K29/10
摘要： A printed circuit motor is constructed with the printed circuit windings stationary, and therefore constituting the stator of the motor. The stator is mounted at the end of a heavy hollow supporting frame member. The rotor is mounted on the end of a shaft which is journaled within the hollow frame member, and the rotor extends outwardly in close proximity to the stator and around the outer periphery of the stator and back toward the hollow supporting member, with a permanent magnet assembly on one side of the printed circuit stator and the magnetic return path on the other side of it. The permanent magnet assembly and the magnetic return path are rigidly coupled so that no relative motion occurs between them. Electrical connections to the winding turns of the stator are brought out from the periphery of the stator close to its surface through an additional printed circuit board, and along the outer surface of the hollow frame member to pass the inner edge of the permanent magnet rotor. Timing for the energization of the coils of the printed circuit stator is controlled by three photosensors which are interrupted by the outer edge of the rotating return path of the rotor, which is provided with a peripheral interruptions to selectively block the light path to the photosensors. Six coils of the printed circuit stator are arranged in a Y-configuration and are selectively energized in accordance with the output from the photosensors.
摘要翻译：印刷电路电机由印刷电路绕组固定构成，因此构成电动机的定子。定子安装在重型中空支撑框架构件的端部。转子安装在轴颈的端部，其轴颈位于中空框架构件内，并且转子非常靠近定子并且围绕定子的外周向外延伸并且朝向中空支撑构件向后延伸，具有永磁体组装在印刷电路定子的一侧和另一侧的磁返回路径上。永磁体组件和磁返回路径刚性联接，使得它们之间不发生相对运动。与定子的绕组匝的电连接通过另外的印刷电路板从定子的周边靠近其表面，并沿着中空框架构件的外表面从永久磁铁转子的内边缘通过。对印刷电路定子的线圈通电的定时由三个光电传感器控制，这三个光电传感器被转子的旋转返回路径的外边缘中断，该传感器设置有周边中断以选择性地阻挡光传感器的光路。印刷电路定子的六个线圈以Y形配置并根据光电传感器的输出选择性地通电。

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