Patents by Inventor Yanzhen Liu
Yanzhen Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230272264Abstract: The present invention belongs to the technical field of natural gas hydrates (NGHs), and provides an environmentally friendly NGH inhibitor and application. The hydrate inhibitor has a component of nisin, and further comprises chitooligosaccharide and an alcohol thermodynamic hydrate inhibitor, that can enhance the thermostability of the inhibitor and the inhibitory effect for NGHs. The optimal application conditions of the NGH inhibitor of the present invention are: temperatures of ?10 to 100° C., pressures of 0.1 to 25 MPa, and a maximum subcooling degree of 12° C. The inhibitor of the present invention has good NGH inhibitory performance and certain antibacterial effects, which is a low-dose, degradable, high temperature resistant, green, environmental protective, safe and efficient NGH inhibitor, that can be used for the fields of oil-gas transportation and NGHs, and provides a new solution for field application of green natural hydrate inhibitors.Type: ApplicationFiled: December 28, 2021Publication date: August 31, 2023Inventors: Jiafei ZHAO, Yuxin JIA, Lei YANG, Yanzhen LIU, Lunxiang ZHANG, Yongchen SONG, Weiguo LIU, Yanghui LI, Yu LIU, Mingjun YANG, Zheng LING, Dayong WANG, Xiang SUN, Tao YU
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Publication number: 20090244937Abstract: In one aspect, in general, the invention features a control system configured for use with a three-phase PWM converter. The control system receives an input signal from a three-phase power supply and provides an output signal at a DC link. A voltage-separating module generates on the basis of the input signal a positive sequence voltage component and a negative sequence voltage component in a rotating reference frame. A reference current computation module uses at least the positive sequence voltage component and the negative sequence voltage component to compute a first reference current and a second reference current. A current regulating module uses at least the first reference current and the second reference current to generate a command signal. The command signal is provided to a driving circuit of the three-phase PWM converter for generating a regulated DC bus voltage at the DC link.Type: ApplicationFiled: March 28, 2008Publication date: October 1, 2009Applicant: American Superconductor CorporationInventor: Yanzhen Liu
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Patent number: 7346475Abstract: The present invention is directed to a system and method for proactively determining motor wellness arising from potential mechanical faults of the motor. A controller is configured to detect indicia of impending mechanical motor faults. The controller includes a processor configured to determine motor parameters of a given motor including a load and generate a set of baseline data for the given motor. The processor is also configured to acquire current spectrum data from the given motor during operation, map at least one from a plurality of load bins based on the load, and generate a mechanical fault signature from the current spectrum. The processor is caused to compare the mechanical fault signature to baseline data from the set of baseline data corresponding to the mapped bin and determine amplitude variances within the mechanical fault signature indicative of an impending mechanical fault prior to an actual mechanical fault occurrence.Type: GrantFiled: June 27, 2006Date of Patent: March 18, 2008Assignee: Eaton CorporationInventors: Steven A. Dimino, Thomas G. Habetler, Ramzy R. Obaid, Slobodan Krstic, Michael P. Nowak, Yanzhen Liu
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Patent number: 7336455Abstract: The present invention is directed to a power meter or overload relay including a housing and a plurality of sensors configured to monitor operation of a motor. A processor disposed within the housing and configured to receive operational feedback from the plurality of sensor and proactively determine an operational wellness of the motor from the operational feedback.Type: GrantFiled: May 22, 2006Date of Patent: February 26, 2008Assignee: Eaton CorporationInventors: Steven A. Dimino, Thomas G. Habetler, Ramzy R. Obaid, Slobodan Krstic, Michael P. Nowak, Yanzhen Liu
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Patent number: 7231319Abstract: The present invention is directed to system and method for determining motor wellness based on potential faults including cavitation faults. Specifically, a controller configured to detect indicia of motor faults. The controller includes a processor configured to determine motor parameters of a given motor, generate a set of baseline data for the given motor, and acquire current data from the given motor during operation. The processor is also caused to isolate sidebands within the current data and map the current data within the sidebands to one of a plurality of bins. The processor is caused to compare the current data within the sidebands to baseline data from the set of baseline data associated with the bin and determine a predictive fault index of the given motor prior to an actual fault occurrence.Type: GrantFiled: June 2, 2004Date of Patent: June 12, 2007Assignee: Eaton CorporationInventors: Steven A. Dimino, Slobodan Krstic, Michael P. Nowak, Yanzhen Liu
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Publication number: 20070005291Abstract: The present invention is directed to a system and method for proactively determining motor wellness arising from potential mechanical faults of the motor. A controller is configured to detect indicia of impending mechanical motor faults. The controller includes a processor configured to determine motor parameters of a given motor including a load and generate a set of baseline data for the given motor. The processor is also configured to acquire current spectrum data from the given motor during operation, map at least one from a plurality of load bins based on the load, and generate a mechanical fault signature from the current spectrum. The processor is caused to compare the mechanical fault signature to baseline data from the set of baseline data corresponding to the mapped bin and determine amplitude variances within the mechanical fault signature indicative of an impending mechanical fault prior to an actual mechanical fault occurrence.Type: ApplicationFiled: June 27, 2006Publication date: January 4, 2007Inventors: Thomas Habetler, Ramzy Obaid, Steven Dimino, Michael Nowak, Yanzhen Liu, Slobodan Krstic
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Patent number: 7117125Abstract: The present invention is directed to a system and method for proactively determining motor wellness arising from potential mechanical faults of the motor. A controller is configured to detect indicia of impending mechanical motor faults. The controller includes a processor configured to determine motor parameters of a given motor including a load and generate a set of baseline data for the given motor. The processor is also configured to acquire current spectrum data from the given motor during operation, map at least one from a plurality of load bins based on the load, and generate a mechanical fault signature from the current spectrum. The processor is caused to compare the mechanical fault signature to baseline data from the set of baseline data corresponding to the mapped bin and determine amplitude variances within the mechanical fault signature indicative of an impending mechanical fault prior to an actual mechanical fault occurrence.Type: GrantFiled: June 2, 2004Date of Patent: October 3, 2006Assignee: Eaton CorporationInventors: Steven A. Dimino, Thomas G. Habetler, Ramzy R. Obaid, Slobodan Krstic, Michael P. Nowak, Yanzhen Liu
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Publication number: 20060196265Abstract: The present invention is directed to a power meter or overload relay including a housing and a plurality of sensors configured to monitor operation of a motor. A processor disposed within the housing and configured to receive operational feedback from the plurality of sensor and proactively determine an operational wellness of the motor from the operational feedback.Type: ApplicationFiled: May 22, 2006Publication date: September 7, 2006Inventors: Steven Dimino, Thomas Habetler, Ramzy Obaid, Slobodan Krstic, Michael Nowak, Yanzhen Liu
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Patent number: 7075327Abstract: The present invention is directed to a power meter or overload relay including a housing and a plurality of sensors configured to monitor operation of a motor. A processor disposed within the housing and configured to receive operational feedback from the plurality of sensor and proactively determine an operational wellness of the motor from the operational feedback.Type: GrantFiled: June 2, 2004Date of Patent: July 11, 2006Assignee: Eaton CorporationInventors: Steven A. Dimino, Thomas G. Habetler, Ramzy R. Obaid, Slobodan Krstic, Michael P. Nowak, Yanzhen Liu
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Publication number: 20050021301Abstract: The present invention is directed to a system and method for proactively determining motor wellness arising from potential mechanical faults of the motor. A controller is configured to detect indicia of impending mechanical motor faults. The controller includes a processor configured to determine motor parameters of a given motor including a load and generate a set of baseline data for the given motor. The processor is also configured to acquire current spectrum data from the given motor during operation, map at least one from a plurality of load bins based on the load, and generate a mechanical fault signature from the current spectrum. The processor is caused to compare the mechanical fault signature to baseline data from the set of baseline data corresponding to the mapped bin and determine amplitude variances within the mechanical fault signature indicative of an impending mechanical fault prior to an actual mechanical fault occurrence.Type: ApplicationFiled: June 2, 2004Publication date: January 27, 2005Inventors: Steven Dimino, Thomas Habetler, Ramzy Obaid, Slobodan Krstic, Michael Nowak, Yanzhen Liu
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Publication number: 20050021302Abstract: The present invention is directed to system and method for determining motor wellness based on potential faults including cavitation faults. Specifically, a controller configured to detect indicia of motor faults. The controller includes a processor configured to determine motor parameters of a given motor, generate a set of baseline data for the given motor, and acquire current data from the given motor during operation. The processor is also caused to isolate sidebands within the current data and map the current data within the sidebands to one of a plurality of bins. The processor is caused to compare the current data within the sidebands to baseline data from the set of baseline data associated with the bin and determine a predictive fault index of the given motor prior to an actual fault occurrence.Type: ApplicationFiled: June 2, 2004Publication date: January 27, 2005Inventors: Steven Dimino, Slobodan Kristic, Michael Nowak, Yanzhen Liu
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Publication number: 20050007096Abstract: The present invention is directed to a power meter or overload relay including a housing and a plurality of sensors configured to monitor operation of a motor. A processor disposed within the housing and configured to receive operational feedback from the plurality of sensor and proactively determine an operational wellness of the motor from the operational feedback.Type: ApplicationFiled: June 2, 2004Publication date: January 13, 2005Inventors: Steven Dimino, Thomas Habetler, Ramzy Obaid, Slobodan Krstic, Michael Nowak, Yanzhen Liu