Method to detect the true zero-crossing points of the phase back EMF for sensorless control of brushless DC motors
    12.
    发明授权
    Method to detect the true zero-crossing points of the phase back EMF for sensorless control of brushless DC motors 有权
    检测无刷直流电动机无传感器控制的反相电动势的真正过零点的方法

    公开(公告)号:US06879124B1

    公开(公告)日:2005-04-12

    申请号:US10752013

    申请日:2004-01-07

    Applicant: Quan Jiang Chao Bi

    Inventor: Quan Jiang Chao Bi

    CPC classification number: H02P6/182 H02P6/187

    Abstract: In the present system and method, ZCP level signals of each phase voltage are first obtained. Among the detected ZCP level signals, some ZCPs are generated by phase back EMF, which are true ZCPs and other ZCPs by commutations, which are false ZCPs. The duration of the false ZCP level outputs varies with the excited phase current, inductance and back EMF of motors, the present invention utilizes fixed-width narrow pulse signals corresponding to the rising and falling edges of the ZCP level outputs in order to eliminate influences of the earlier disclosed motor parameters. These fixed width pulse signals make up the ZCP pulse signal. Because the first edge of the plurality of false ZCP level signal substantially corresponds to the switching-off signal of the commutated-off excited phase, a first false ZCP masking signal having pulses wider than the ZCP pulse signal are applied to mask the first plurality of false ZCP signals. Comparing the logic values of the ZCP level signals, the pulses of the ZCP pulse signals are identified as true ZCPs when the logic values of the current pulse are different from the logic value of a preceding pulse. Correspondingly, if the logic value of the current pulse is the same as the logic value of the preceding pulse, the current pulse is a false ZCP. In these way, the phase-delay free and true zero-crossing points of all the phase back EMFs can be obtained with the simple circuit and logic processing.

    Abstract translation: 在本系统和方法中,首先获得各相电压的ZCP电平信号。 在检测到的ZCP电平信号中,一些ZCP通过反相电动势产生,它们是真正的ZCP和其他ZCP,通过换算,这是虚假的ZCP。 假ZCP电平输出的持续时间随着电动机的励磁相电流,电感和反电动势而变化,本发明利用对应于ZCP电平输出的上升沿和下降沿的固定宽度窄脉冲信号,以消除 早先公布的电机参数。 这些固定宽度的脉冲信号组成ZCP脉冲信号。 因为多个虚拟ZCP电平信号的第一边缘基本上对应于换向激励相位的关断信号,所以施加具有比ZCP脉冲信号更宽的脉冲的第一假ZCP屏蔽信号以掩蔽第一多个 假ZCP信号。 比较ZCP电平信号的逻辑值,当电流脉冲的逻辑值与前一脉冲的逻辑值不同时,ZCP脉冲信号的脉冲被识别为真ZCP。 相应地,如果当前脉冲的逻辑值与先前脉冲的逻辑值相同,则当前脉冲为假ZCP。 以这种方式,可以通过简单的电路和逻辑处理获得所有相位反相电动势的相位无相位和真正的过零点。

    Camera
    13.
    发明授权
    Camera 失效
    相机

    公开(公告)号:US06289181B1

    公开(公告)日:2001-09-11

    申请号:US09177369

    申请日:1998-10-23

    Abstract: A camera (1) is provided with an object lens, an aperture and guiding means for an image recording medium. The camera includes a means for providing generally scattered or white light to be incident on a first portion of the image recording medium and a light adjusting means for varying the dissipation of the white or scattered light across the aperture of the camera in relation to the exposure time across the aperture. The camera also includes a lens system with an object lens and an additional focusing means with a focal length in a first area being infinite and in a second area being relatively short focusing light on the image close to the lens system, for example on the plate (10) held in front of the lens system. Light enhancement means are also provided for increasing the light on the first portion of the image recording medium.

    Abstract translation: 相机(1)设置有物镜,孔和用于图像记录介质的引导装置。 照相机包括用于提供大体上散射的或白色的光入射在图像记录介质的第一部分上的装置,以及用于相对于曝光改变白光或散射光穿过照相机的光圈的散射的光调节装置 时间穿过光圈。 相机还包括具有物镜的透镜系统和附加的聚焦装置,其中第一区域中的焦距是无穷大的,并且在第二区域中,相对较短的焦点聚焦到靠近透镜系统的图像上,例如在板上 (10)保持在镜头系统前面。 光增强装置还用于增加图像记录介质的第一部分上的光。

    Runout measurement for devices having a rotating body
    14.
    发明授权
    Runout measurement for devices having a rotating body 有权
    具有旋转体的设备的径向测量

    公开(公告)号:US08610392B2

    公开(公告)日:2013-12-17

    申请号:US13132592

    申请日:2008-12-02

    CPC classification number: G11B5/59627

    Abstract: A runout measurement system is proposed for measuring the runout of a moving surface of a device having a rotating body, such as a mass storage device (100) (e.g. a hard disk drive) having a rotor which in use includes a rotating recording medium. A sensor (102) interacting with the moving surface obtains a displacement signal. The displacement signal is sampled by a sampling unit (104) controlled by a unit (109) which initiates sampling based on both a signal indicating a ZCP and the clock signal of a high frequency (e.g. 20 MHz) clock (106). Simultaneously, the same clock (106) is used by a counter 108 to measure the spacing between one or more ZCP times. This permits the correspondence between the sampling times and the angular position of the rotor to be found with a high accuracy which depends upon the clock frequency, and thereby allows calculation of repeatable runout (RRO) and non-repeatable runout (NRRO).

    Abstract translation: 提出了一种用于测量具有旋转体的装置的移动表面的跳动测量系统,例如具有转子的大容量存储装置(例如硬盘驱动器),该旋转体在使用中包括旋转记录介质。 与运动表面相互作用的传感器(102)获得位移信号。 位移信号由由单元(109)控制的采样单元(104)采样,单元(109)基于指示ZCP的信号和高频(例如20MHz)时钟(106)的时钟信号两者启动采样。 同时,计数器108使用相同的时钟(106)来测量一个或多个ZCP时间之间的间隔。 这允许以取决于时钟频率的高精度找到转子的采样时间和角位置之间的对应关系,从而允许计算可重复的跳动(RRO)和不可重复的跳动(NRRO)。

    RUNOUT MEASUREMENT FOR DEVICES HAVING A ROTATING BODY
    15.
    发明申请
    RUNOUT MEASUREMENT FOR DEVICES HAVING A ROTATING BODY 有权
    具有旋转体的设备的运行测量

    公开(公告)号:US20110239761A1

    公开(公告)日:2011-10-06

    申请号:US13132592

    申请日:2008-12-02

    CPC classification number: G11B5/59627

    Abstract: A runout measurement system is proposed for measuring the runout of a moving surface of a device having a rotating body, such as a mass storage device (100) (e.g. a hard disk drive) having a rotor which in use includes a rotating recording medium. A sensor (102) interacting with the moving surface obtains a displacement signal. The displacement signal is sampled by a sampling unit (104) controlled by a unit (109) which initiates sampling based on both a signal indicating a ZCP and the clock signal of a high frequency (e.g. 20 MHz) clock (106). Simultaneously, the same clock (106) is used by a counter 108 to measure the spacing between one or more ZCP times. This permits the correspondence between the sampling times and the angular position of the rotor to be found with a high accuracy which depends upon the clock frequency, and thereby allows calculation of repeatable runout (RRO) and non-repeatable runout (NRRO).

    Abstract translation: 提出了一种用于测量具有旋转体的装置的移动表面的跳动测量系统,例如具有转子的大容量存储装置(例如硬盘驱动器),该旋转体在使用中包括旋转记录介质。 与移动表面相互作用的传感器(102)获得位移信号。 位移信号由由单元(109)控制的采样单元(104)采样,单元(109)基于指示ZCP的信号和高频(例如20MHz)时钟(106)的时钟信号两者启动采样。 同时,计数器108使用相同的时钟(106)来测量一个或多个ZCP时间之间的间隔。 这允许以取决于时钟频率的高精度找到转子的采样时间和角位置之间的对应关系,从而允许计算可重复的跳动(RRO)和不可重复的跳动(NRRO)。

    Low profile spindle motor
    18.
    发明授权
    Low profile spindle motor 有权
    薄型主轴电机

    公开(公告)号:US08946952B2

    公开(公告)日:2015-02-03

    申请号:US12601782

    申请日:2008-05-09

    CPC classification number: H02K1/148 H02K3/26 H02K21/16

    Abstract: A low profile spindle motor for supporting and rotating media disk or disks of a hard disk drive includes a plurality of stator teeth, a winding layer which may be formed by printed circuit board or the like, and a rotor. The plurality of stator teeth are disposed in an annular region surrounding an axis of rotation of the motor, and have projected ends for increasing the tooth area facing a magnet ring of the rotor. The winding layer has a plurality of windings disposed surrounding the axis of rotation. Each winding is coupled to one of the plurality of stator teeth. The magnet ring is positioned radially spaced apart and coplanar with the annular region. The magnet ring has magnetic poles annularly distributed to generate magnetic fluxes along radial direction. Spindle motor formed according to the invention has a low profile, improved performance and manufacturability.

    Abstract translation: 用于支撑和旋转硬盘驱动器的介质盘或盘的小型主轴电机包括多个定子齿,可由印刷电路板等形成的绕组层和转子。 多个定子齿设置在围绕电动机的旋转轴线的环形区域中,并且具有用于增加面向转子的磁环的齿面积的突出端。 绕组层具有围绕旋转轴设置的多个绕组。 每个绕组联接到多个定子齿中的一个。 磁环位于径向间隔开并且与环形区域共面。 磁环具有环形分布的磁极,以沿径向产生磁通量。 根据本发明形成的主轴电机具有低轮廓,改进的性能和可制造性。

    PROVIDING SERVICES TO MULTIPLE TENANTS OF AN APPLICATION
    19.
    发明申请
    PROVIDING SERVICES TO MULTIPLE TENANTS OF AN APPLICATION 有权
    向多个应用程序提供服务

    公开(公告)号:US20110213870A1

    公开(公告)日:2011-09-01

    申请号:US13034799

    申请日:2011-02-25

    CPC classification number: H04L67/10

    Abstract: A method, system and computer program product for providing a service to multiple tenants of an application. Responsive to receiving from a client of a tenant a request, a tenant context of the tenant is bound to the request. With respect to an access to an isolation point of the application in the request, the access to the isolation point is redirected to a partition based on the tenant context bound to the request. The partition may be pre-established for the tenant with respect to the application. Hence, it is possible to provide a multi-tenant solution in a convenient, fast, and cost-effective way, and, in turn, to achieve resource sharing to a greater extent and enhance the resource efficiency.

    Abstract translation: 一种用于向应用的多个租户提供服务的方法,系统和计算机程序产品。 响应于从租户的客户接收请求,承租人的租客上下文必须符合该请求。 关于在请求中对应用的隔离点的访问,基于绑定到请求的租户上下文,将对隔离点的访问重定向到分区。 相对于应用,可以为租户预先建立分区。 因此,可以以方便,快速,成本有效的方式提供多租户解决方案,从而在更大程度上实现资源共享,提高资源效率。

    Method for initiating re-enumeration of a device
    20.
    发明申请
    Method for initiating re-enumeration of a device 有权
    启动设备重新枚举的方法

    公开(公告)号:US20080195765A1

    公开(公告)日:2008-08-14

    申请号:US11705065

    申请日:2007-02-12

    CPC classification number: G06F9/4413

    Abstract: A method of initiating re-enumeration of a USB device without manual intervention is provided. The method involves a sequence emulating detachment and re-attachment of a device to the host while the device remains attached to the host. As the device remains attached to the host throughout the sequence, the host OS is manipulated to receive a plurality of preset device states in order for it to perceive a device change and to eventually initiate device enumeration. The sequence, which involves a series of command exchanges between the device and the host, may be initiated by a software application residing in the host upon an event requiring device enumeration.

    Abstract translation: 提供了一种无需手动干预即可重新枚举USB设备的方法。 该方法涉及在设备保持连接到主机时模拟设备向主机的拆卸和重新附接的顺序。 由于设备在整个序列中保持连接到主机,操纵主机OS以接收多个预设设备状态,以便它感知设备改变并最终启动设备枚举。 涉及在设备和主机之间的一系列命令交换的序列可以由驻留在主机中的软件应用程序在需要设备枚举的事件时启动。

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