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    • 1. 发明授权
    • Fully testable DCVS circuits with single-track global wiring
    • 具有单轨全球接线的完全可测试的DCVS电路
    • US5299136A
    • 1994-03-29
    • US711466
    • 1991-06-05
    • Jacquelin BabakanianJames W. DavisMark S. GarvinRobert M. SwansonNandor G. ThomaDavid M. Wu
    • Jacquelin BabakanianJames W. DavisMark S. GarvinRobert M. SwansonNandor G. ThomaDavid M. Wu
    • G01R31/28G01R31/3185H03K19/00H03K19/0944H03K19/173G06F15/20
    • G01R31/318536H03K19/1738
    • Groups of DCVS (Differential Cascode Voltage Switch) circuits are interconnected by single-track data transfer connections. Each group contains one or more DCVS tree circuits, through which data signals propagate only on dual-track connections. In each group, at least one DCVS tree circuit is configured as an input boundary tree, and at least one tree circuit is configured as an output boundary tree. All data inputs externally applied to a group, are transferred only through input boundary trees of the group, and all data outputs transferred out of a group leave the group only through output boundary trees of the group. If a group has only a single tree, that tree serves as input and output boundary tree of the group. Each input boundary tree of each group has one or more associated primary shift register latch (SRL) circuits through which all external data inputs to that tree are transferred. Such external data inputs are received through the single-track connections mentioned above. The primary SRL circuits are also used to present predeterminable test data inputs to respective trees, and to collect primary test data outputs representing signals received through the single-track connections. In such usage, the SRL circuits are connected as a scannable shift register. Each output boundary tree has an exclusive-OR (XOR) circuit for indicating if the respective tree is in a legal or illegal state. The XOR circuits connect to secondary scannable SRL circuits for external presentation of illegal state indication. The primary test data outputs together with the externally presented illegal state indications form a basis for detecting and locating any faulty state in any group.
    • DCVS(差分串联电压开关)电路组通过单轨数据传输连接相互连接。 每组包含一个或多个DCVS树电路,数据信号仅通过双路连接传播。 在每个组中,至少一个DCVS树电路被配置为输入边界树,并且至少一个树电路被配置为输出边界树。 外部应用于组的所有数据输入仅通过组的输入边界树进行传输,并且从组中传出的所有数据输出仅通过组的输出边界树离开组。 如果一个组只有一棵树,则该树用作该组的输入和输出边界树。 每个组的每个输入边界树具有一个或多个相关联的主移位寄存器锁存(SRL)电路,通过该电路,传输该树的所有外部数据输入。 这样的外部数据输入通过上述单轨连接来接收。 主要的SRL电路还用于向各树提供可预测的测试数据输入,并收集表示通过单轨道连接接收的信号的主要测试数据输出。 在这种使用中,SRL电路作为可扫描移位寄存器连接。 每个输出边界树具有异或(XOR)电路,用于指示相应的树是否处于合法或非法状态。 XOR电路连接到二次可扫描的SRL电路,用于外部呈现非法状态指示。 主要测试数据输出与外部提供的非法状态指示一起构成检测和定位任何组中任何故障状态的基础。
    • 3. 发明授权
    • System for protecting bearings and seals of a refrigerant compressor
    • 用于保护制冷剂压缩机轴承和密封的系统
    • US07922467B2
    • 2011-04-12
    • US11650279
    • 2007-01-05
    • Robert M. SwansonJoel S. DugaDavid M. Foye
    • Robert M. SwansonJoel S. DugaDavid M. Foye
    • F04D17/08F04D29/056F04D29/60
    • F25B1/04F04D25/0606F04D27/0292F04D29/059H02K11/20Y10T29/49238
    • To protect the bearings, lubricant and seals of a refrigerant compressor, the compressor includes one or more inductors for mitigating a high frequency common mode current that produces a high frequency shaft voltage. Each inductor is a ring of magnetic material encircling three insulated cables that convey three-phase power from an adjustable frequency drive to the compressor's motor. Without the inductors, the high frequency shaft voltage can become damagingly high due to the length of a cast iron housing that can be particularly long if the housing contains both a motor and several centrifugal impellers. The high frequency shaft voltage is just one component of a composite adverse shaft voltage. Another component, known as an operationally induced shaft voltage, can be reduced by a grounding contact, so instead of using just an inductor or just a contact, both can be used to provide a total solution to the problem.
    • 为了保护制冷剂压缩机的轴承,润滑剂和密封件,压缩机包括用于减轻产生高频轴电压的高频共模电流的一个或多个电感器。 每个电感都是环绕三根绝缘电缆的磁性材料环,将三相电源从变频器传输到压缩机的电机。 没有电感器,由于铸铁壳体的长度,高频轴电压可能会变得很高,如果外壳包含电动机和多个离心式叶轮,则可能特别长。 高频轴电压只是复合不利轴电压的一个组成部分。 被称为可操作感应的轴电压的另一个组件可以通过接地触点来减少,因此,不仅仅使用电感器或仅仅使用接触器,所以可以使用这两个部件来提供问题的总体解决方案。
    • 5. 发明授权
    • Multilevel phase unbalance compressor motor protection system
    • 多级相不平衡压缩机电机保护系统
    • US5058031A
    • 1991-10-15
    • US502355
    • 1990-03-30
    • Robert M. SwansonPaul C. RentmeesterDavid M. Foye
    • Robert M. SwansonPaul C. RentmeesterDavid M. Foye
    • H02H7/09
    • H02H7/09
    • A method of protecting the compressor motor of a refrigeration system using a multiphase AC power source. The method comprises the steps of monitoring each phase of the power supply to the compressor motor; calculating the average phase for the phases of the AC power supply; determining a maximum phase unbalance deviation from the average phase; determining if a first level of phase unbalance protection is active; setting a system protection level as the first level of phase unbalance protection if the first level is active; setting the system protection level as a second higher level of phase unbalance protection if the first level is not active; and initiating a compressor motor shutdown if the system protection level is exceeded by the maximum unbalanced phase deviation.
    • 使用多相交流电源保护制冷系统的压缩机电动机的方法。 该方法包括以下步骤:监测对压缩机电动机的电源的每个相位; 计算交流电源的相位的平均相位; 确定与平均相位的最大相位不平衡偏差; 确定相位不平衡保护的第一级是否有效; 如果第一级激活,则将系统保护级别设置为第一级相位不平衡保护; 如果第一级不活动,则将系统保护级别设置为第二级相位不平衡保护级别; 如果系统保护等级超过最大不平衡相位偏差,则启动压缩机电机停机。
    • 7. 发明申请
    • System for protecting bearings and seals of refrigerant compressor
    • 制冷剂压缩机轴承和密封保护系统
    • US20110179644A1
    • 2011-07-28
    • US13065977
    • 2011-04-04
    • Robert M. SwansonJoel S. DugaDavid M. Foye
    • Robert M. SwansonJoel S. DugaDavid M. Foye
    • B23P6/00
    • F25B1/04F04D25/0606F04D27/0292F04D29/059H02K11/20Y10T29/49238
    • To protect the bearings, lubricant and seals of a refrigerant compressor, the compressor includes one or more inductors for mitigating a high frequency common mode current that produces a high frequency shaft voltage. Each inductor is a ring of magnetic material encircling three insulated cables that convey three-phase power from an adjustable frequency drive to the compressor's motor. Without the inductors, the high frequency shaft voltage can become damagingly high due to the length of a cast iron housing that can be particularly long if the housing contains both a motor and several centrifugal impellers. The high frequency shaft voltage is just one component of a composite adverse shaft voltage. Another component, known as an operationally induced shaft voltage, can be reduced by a grounding contact, so instead of using just an inductor or just a contact, both can be used to provide a total solution to the problem.
    • 为了保护制冷剂压缩机的轴承,润滑剂和密封件,压缩机包括用于减轻产生高频轴电压的高频共模电流的一个或多个电感器。 每个电感都是环绕三根绝缘电缆的磁性材料环,将三相电源从变频器传输到压缩机的电机。 没有电感器,由于铸铁壳体的长度,高频轴电压可能会变得很高,如果外壳包含电动机和多个离心式叶轮,则可能特别长。 高频轴电压只是复合不利轴电压的一个组成部分。 被称为可操作感应的轴电压的另一个组件可以通过接地触点来减少,因此,不仅仅使用电感器或仅仅使用接触器,所以可以使用这两个部件来提供问题的总体解决方案。