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公开(公告)号：US5608771A
公开(公告)日：1997-03-04
申请号：US547078
申请日：1995-10-23
摘要： Power is transferred from a stationary power supply to a rotational gantry in a computer tomography (CT) system through a rotary transformer arranged in a ring configuration with an inner diameter that is sufficiently large to receive a patient. The rotary transformer has a toroidal rotor core and a toroidal stator core arranged either concentrically with an air gap extending radially therebetween or side-by-side with an air gap extending axially therebetween. A resonant inverter provides ac power to the rotary transformer which, in turn, drives a high-voltage tank circuit coupled to a x-ray tube, the tank circuit and x-ray tube being mounted on a rotational gantry. Advantageously, this is a contactless power transfer system which eliminates conventional brush and slip ring arrangements and moreover avoids the need for mounting the inverter to rotate with the CT gantry.
摘要翻译： 电力通过布置成具有足够大以容纳患者的内径的环形结构的旋转变压器从计算机断层摄影（CT）系统中的固定电源传送到旋转台架。 旋转变压器具有环形转子芯和环形定子芯，该环形定子芯同心地布置有与其间径向延伸的气隙，或者与其间轴向延伸的气隙并排布置。 谐振逆变器为旋转变压器提供交流电力，旋转变压器又驱动耦合到X射线管的高压电路，电路和X射线管安装在旋转机架上。 有利地，这是一种非接触式电力传输系统，其消除了常规的刷和滑环布置，并且还避免了安装逆变器以与CT机架一起旋转的需要。
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2.发明授权Noise cancellation method in a biomagnetic measurement system using an extrapolated reference measurement 失效使用外推参考测量的生物磁测量系统中的噪声消除方法
公开(公告)号：US5187436A
公开(公告)日：1993-02-16
申请号：US850725
申请日：1992-03-13
申请人： John A. Mallick
发明人： John A. Mallick
IPC分类号： A61B5/05 , G01R33/02 , G01R33/022
CPC分类号： G01R33/02 , G01R33/022
摘要： A system and method for noiseless measurement of a biomagnetic field uses magnetic field magnitude and gradient measurement at a reference point together with mathematical extrapolation techniques to provide an effectively infinite order gradiometer response from a lower order physical gradiometer. Such a system has the advantages of potentially lower cost, higher accuracy, and easier adjustment and balancing.
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公开(公告)号：US5609946A
公开(公告)日：1997-03-11
申请号：US538488
申请日：1995-10-03
CPC分类号： B82Y25/00 , H01F10/3254 , H01F17/04 , Y10T428/24917 , Y10T428/24926
摘要： A high frequency, high density, low profile magnetic circuit component includes a magnetic core having a first magnetic layer and a second magnetic layer with a conductive layer deposited therebetween, each magnetic layer being a multilayer structure comprised of alternating magnetic and insulating films. The magnetic films are anisotropic and are driven along their magnetic hard axis in order to reduce excess eddy current losses. To reduce fringing field eddy current losses, a distributed air gap is structured in the magnetic layers. The magnetic core has a distributed air gap formed therein in order to minimize eddy current losses in the conductive layer. The conductive layer has a conductive material patterned on a insulating substrate and is situated between the first and second magnetic layers such that the conductive material extends beyond the peripheries of the first and second magnetic layers, thereby maximizing the amount of magnetic material that is driven in the hard axis.
摘要翻译： 高频，高密度，低轮廓的磁路组件包括具有第一磁性层的磁芯和其间沉积有导电层的第二磁性层，每个磁性层是由交替的磁性和绝缘膜构成的多层结构。 磁性膜是各向异性的，并沿其磁性硬轴驱动，以减少额外的涡流损耗。 为了减少边缘场涡流损耗，在磁层中形成分布式气隙。 磁芯具有形成在其中的分布式气隙，以便最小化导电层中的涡流损耗。 导电层具有在绝缘基板上图案化的导电材料，并且位于第一和第二磁性层之间，使得导电材料延伸超过第一和第二磁性层的周边，从而最大化驱动的磁性材料的量 硬轴。
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4.发明授权Subsampling time-domain digital filter using sparsely clocked output latch 失效使用稀疏时钟输出锁存器的子采样时域数字滤波器
公开(公告)号：US4982353A
公开(公告)日：1991-01-01
申请号：US414869
申请日：1989-09-28
摘要： The plural-phase clocking signal used in a subsampling time-domain digital filter is partially blanked to generate a sparse clocking signal for a clocked data latch that decimates the output signal from the digital filter, to supply it at a subsampling rate as compared to the sampling rate of input signal to the filter. The blanking signal is generated from a counter that counts occurrences of pulses in the plural-phase clocking signal, which counter comprises a ripple-carry adder and another clocked data latch arranged to accumulate successive unit values. This procedure guarantees correct timing of clocking signal for the output latch vis-a-vis the plural-phase clocking signal used in the preceding time-domain digital filter despite the time taken for carry ripplethrough in the counter adder. Digital hardware is conserved by blanking only one phase of the plural-phase clocking signals.
摘要翻译： 在子采样时域数字滤波器中使用的多相时钟信号被部分消隐，以产生用于对来自数字滤波器的输出信号进行抽取的时钟数据锁存器的稀疏时钟信号，以将其与子采样时间信号 输入信号到滤波器的采样率。 消隐信号由计数器产生，该计数器对多相时钟信号中的脉冲发生进行计数，该计数器包括纹波进位加法器和另一个计时数据锁存器，被布置为累积连续的单位值。 尽管在计数器加法器中进行进位纹波的时间，该过程保证输出锁存器对于前一时域数字滤波器中使用的多相时钟信号的时钟信号的正确定时。 数字硬件通过仅消除多相时钟信号的一相来节省。
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5.发明授权Electronic circuit breaker using digital circuitry having instantaneous trip capability 失效具有瞬时跳闸功能的数字电路的电子断路器
公开(公告)号：US4943888A
公开(公告)日：1990-07-24
申请号：US377373
申请日：1989-07-10
CPC分类号： H02H3/0935
摘要： Instantaneous trip capability is provided to an electronic circuit breaker, which is of the type that generates trip signals by accumulating squares of power line current samples and thresholds the accumulation results. Samples of power line current are taken directly from the current transformer and analog-to-digital converter cascade generating them. The analog-to-digital converter is of an oversampling type, using a delta-sigma modulator. The samples are threshold detected against a prescribed threshold value without previous squaring, integration and detection. The threshold detector result is checked for two consecutive overcurrent indications before an instantaneous trip signal is generated.
摘要翻译： 电子断路器提供瞬时跳闸能力，该电子断路器是通过累积电力线电流样本的平方并产生累积结果来产生跳闸信号的类型。 电力线电流的样本直接从电流互感器和模数转换器级联产生。 模数转换器是采用Δ-Σ调制器的过采样类型。 样本相对于规定的阈值进行阈值检测，无需先前的平方，积分和检测。 在产生瞬时跳闸信号之前，对两个连续的过电流指示进行阈值检测结果的检查。
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6.发明授权
公开(公告)号：US4425521A
公开(公告)日：1984-01-10
申请号：US384700
申请日：1982-06-03
CPC分类号： H02K3/493 , Y10S174/20
摘要： A magnetic wedge for use in toothed stators holds the stator windings in the slots formed between the teeth of the stator. The magnetic slot wedge comprises a stack of magnetic material with a width corresponding to the width of the slot. The laminations each have central bridge portions connecting a first and second magnetic region, the bridge portion saturating during machine operation. The bridge and the first and second magnetic regions define an opening which, when the laminations are stacked, form a channel having a narrowed entrance. A fiberglass rod fits inside the channel and provides axial stiffness to the stacked laminations which clamp on the fiberglass rod.
摘要翻译： 用于齿形定子的磁楔将定子绕组保持在形成在定子的齿之间的槽中。 磁槽楔包括具有对应于槽的宽度的宽度的一组磁性材料。 叠片各自具有连接第一和第二磁性区域的中心桥接部分，桥接部分在机器操作期间饱和。 桥和第一和第二磁区限定一个开口，当堆叠层叠时，该开口形成具有狭窄入口的通道。 玻璃纤维杆装配在通道内，并对夹在玻璃纤维杆上的堆叠叠片提供轴向刚度。
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公开(公告)号：US4385251A
公开(公告)日：1983-05-24
申请号：US305881
申请日：1981-09-28
申请人： John A. Mallick , Eike Richter , Thomas A. Nondahl
发明人： John A. Mallick , Eike Richter , Thomas A. Nondahl
CPC分类号： H02K19/20
摘要： A homopolar inductor-alternator machine is constructed to have lower transient rectances by the incorporation of a current conducting ring concentric with the axis of the rotor and positioned on the rotor and/or the stator. The conducting ring helps prevent time varying fluxes from inducing eddy current flow in the high permeability rotor steel and unlaminated stator flux return path (back iron). The conducting ring acts upon the transient fluxes which occur in the DC flux path of the machine.
摘要翻译： 通过结合与转子的轴线同心并定位在转子和/或定子上的电流传导环来构造单极电感器 - 交流发电机以具有较低的瞬时电压。 导电环有助于防止在高磁导率转子钢和未层叠的定子磁通返回路径（后铁）中引起涡流流动的时变通量。 导电环作用于发生在机器的直流通路中的瞬态通量。
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