Patents by Inventor Navid Reza Zargari
Navid Reza Zargari 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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Patent number: 10389213Abstract: Disclosed examples include apparatus to couple a motor drive to a motor, including a cable with a first end coupled with an output of a motor drive, a second end coupled with a motor, a plurality of conductors to convey an output signal of the motor drive between the first and second ends to drive the motor, and a plurality of shields, with a conductive junction to couple tap points of at least two of the shields together. Resistors can be used to connect the tap points to the conductive junction to provide an impedance in series with the corresponding shield to reduce voltage stress to the motor or the cable. In certain examples, the shields include a semiconductor material to provide an impedance between the first end and the conductive junction to reduce voltage stress to the motor or the cable.Type: GrantFiled: October 14, 2016Date of Patent: August 20, 2019Assignee: Rockwell Automation Technologies, Inc.Inventors: Yuan Xiao, Navid RezA Zargari, Lixiang Wei, James A. Ulrich
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Publication number: 20180083514Abstract: The disclosed apparatus provides a simple and low cost solution of reducing voltage stress on AC motors and cables in VFD fed motor systems without connecting apparatus to live circuits. Disclosed examples include apparatus to couple a motor drive to a motor, including a cable with a first end coupled with an output of a motor drive, a second end coupled with a motor, a plurality of conductors to convey an output signal of the motor drive between the first and second ends to drive the motor, and a plurality of shields, with a conductive junction to couple tap points of at least two of the shields together. Resistors can be used to connect the tap points to the conductive junction to provide an impedance in series with the corresponding shield to reduce voltage stress to the motor or the cable. In certain examples, the shields include a semiconductor material to provide an impedance between the first end and the conductive junction to reduce voltage stress to the motor or the cable.Type: ApplicationFiled: October 14, 2016Publication date: March 22, 2018Applicant: Rockwell Automation Technologies, Inc.Inventors: Yuan Xiao, Navid Reza Zargari, Lixiang Wei, James A. Ulrich
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Patent number: 9812990Abstract: Apparatus to provide bypass redundancy for a multiphase multilevel inverter including a spare inverter stage and a switch circuit to connect the spare inverter stage between a selected one of the inverter phase first nodes having a bypassed stage and a common connection node, and to connect the remaining inverter phase first nodes with the common connection node.Type: GrantFiled: October 18, 2016Date of Patent: November 7, 2017Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhongyuan Cheng, Navid Reza Zargari
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Patent number: 9372172Abstract: A system for detecting partial discharge in electrical components may include a control system that may operate a drive in an industrial automation system. The industrial automation system may include the electrical components being analyzed for partial discharge. The system may also include one or more acoustic sensors that may detect one or more acoustic waveforms generated within at least one of the electrical components. The system may also include a monitoring system that may receive the acoustic waveforms from the acoustic sensors and determine whether the one electrical component is experiencing partial discharge based on the acoustic waveforms. The monitoring system may then send a notification to the control system when the one electrical component is determined to be experiencing partial discharge, such that the notification indicates that the one electrical component is experiencing partial discharge.Type: GrantFiled: January 28, 2015Date of Patent: June 21, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhongyuan Cheng, Catalin F. Gemanaru, Navid Reza Zargari, Robert N. Bickford
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Patent number: 9304111Abstract: A system for detecting partial discharge in electrical components may include a control system that may operate a drive in an industrial automation system. The industrial automation system may include the electrical components being analyzed for partial discharge. The system may also include one or more acoustic sensors that may detect one or more acoustic waveforms generated within at least one of the electrical components. The system may also include a monitoring system that may receive the acoustic waveforms from the acoustic sensors and determine whether the one electrical component is experiencing partial discharge based on the acoustic waveforms. The monitoring system may then send a notification to the control system when the one electrical component is determined to be experiencing partial discharge, such that the notification indicates that the one electrical component is experiencing partial discharge.Type: GrantFiled: October 1, 2013Date of Patent: April 5, 2016Assignee: Rockwell Automation Technologies, Inc.Inventors: Zhongyuan Cheng, Catalin F. Gemanaru, Navid Reza Zargari, Robert N. Bickford
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Publication number: 20150137827Abstract: A system for detecting partial discharge in electrical components may include a control system that may operate a drive in an industrial automation system. The industrial automation system may include the electrical components being analyzed for partial discharge. The system may also include one or more acoustic sensors that may detect one or more acoustic waveforms generated within at least one of the electrical components. The system may also include a monitoring system that may receive the acoustic waveforms from the acoustic sensors and determine whether the one electrical component is experiencing partial discharge based on the acoustic waveforms. The monitoring system may then send a notification to the control system when the one electrical component is determined to be experiencing partial discharge, such that the notification indicates that the one electrical component is experiencing partial discharge.Type: ApplicationFiled: January 28, 2015Publication date: May 21, 2015Inventors: Zhongyuan Cheng, Catalin F. Gemanaru, Navid Reza Zargari, Robert N. Bickford
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Publication number: 20150091597Abstract: A system for detecting partial discharge in electrical components may include a control system that may operate a drive in an industrial automation system. The industrial automation system may include the electrical components being analyzed for partial discharge. The system may also include one or more acoustic sensors that may detect one or more acoustic waveforms generated within at least one of the electrical components. The system may also include a monitoring system that may receive the acoustic waveforms from the acoustic sensors and determine whether the one electrical component is experiencing partial discharge based on the acoustic waveforms. The monitoring system may then send a notification to the control system when the one electrical component is determined to be experiencing partial discharge, such that the notification indicates that the one electrical component is experiencing partial discharge.Type: ApplicationFiled: October 1, 2013Publication date: April 2, 2015Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Zhongyuan Cheng, Catalin F. Gemanaru, Navid Reza Zargari, Robert N. Bickford
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Patent number: 8350397Abstract: Switching control systems and methods are presented for controlling power conversion systems to provide electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: GrantFiled: September 9, 2011Date of Patent: January 8, 2013Assignee: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Publication number: 20110316490Abstract: Switching control systems and methods are presented for controlling power conversion systems to provide electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: ApplicationFiled: September 9, 2011Publication date: December 29, 2011Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Patent number: 8030791Abstract: Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: GrantFiled: July 31, 2008Date of Patent: October 4, 2011Assignee: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Publication number: 20100025995Abstract: Power conversion apparatus and methods are presented for providing electrical power to a grid or other load in which a synchronous machine is driven by a wind turbine or other prime mover to provide generator power to a switching type current source converter (CSC), with a current source rectifier (CSR) of the CSC being switched to provide d-axis control of the synchronous machine current based on grid power factor feedback, and with a current source inverter (CSI) of the CSC being switched to provide leading firing angle control and selective employment of dumping resists to dissipate excess generator energy in a fault mode when a grid voltage drops below a predetermined level.Type: ApplicationFiled: July 31, 2008Publication date: February 4, 2010Applicant: Rockwell Automation Technologies, Inc.Inventors: Yongqiang Lang, Navid Reza Zargari, Manish Pande, Bin Wu
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Patent number: 7511976Abstract: Self-powered supplies are presented for powering a power converter switch driver with power obtained from an associated snubber circuit, in which a supply circuit and a snubber circuit are connected in a series path across the switch terminals with the supply circuit receiving electrical power from the snubber and providing power to the switch driver.Type: GrantFiled: June 27, 2006Date of Patent: March 31, 2009Assignee: Rockwell Automation Technologies, Inc.Inventors: Navid Reza Zargari, Bin Wu, Weiqian Hu
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Patent number: 7495410Abstract: Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to provide additional DC link current to correct the drive power factor based on current drawn by capacitors of the AC drive power input, and the inverter gain is decreased by introducing bypass states in the inverter switching control scheme or by reducing the motor flux to accommodate the increased DC link current.Type: GrantFiled: January 30, 2007Date of Patent: February 24, 2009Assignee: Rockwell Automation Technologies, Inc.Inventors: Navid Reza Zargari, Jason Cornelius Wiseman, Yuan Xiao
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Publication number: 20080180055Abstract: Systems and methods are described for controlling power factor in motor drives having a switching rectifier providing a DC link current to an inverter in which the rectifier gain is increased to provide additional DC link current to correct the drive power factor based on current drawn by capacitors of the AC drive power input, and the inverter gain is decreased by introducing bypass states in the inverter switching control scheme or by reducing the motor flux to accommodate the increased DC link current.Type: ApplicationFiled: January 30, 2007Publication date: July 31, 2008Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Navid Reza Zargari, Jason Cornelius Wiseman, Yuan Xiao
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Publication number: 20070297202Abstract: Self-powered supplies are presented for powering a power converter switch driver with power obtained from an associated snubber circuit, in which a supply circuit and a snubber circuit are connected in a series path across the switch terminals with the supply circuit receiving electrical power from the snubber and providing power to the switch driver.Type: ApplicationFiled: June 27, 2006Publication date: December 27, 2007Applicant: ROCKWELL AUTOMATION TECHNOLOGIES, INC.Inventors: Navid Reza Zargari, Bin Wu, Weiqian Hu
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Patent number: 7274576Abstract: An improved power converter that produces reduced-levels of common-mode voltages, or even entirely eliminates such voltages, is disclosed herein, along with a method of reducing common-mode voltages. In at least some embodiments, the improved power converter is equipped with common-mode filter inductors and a link coupling input and output ports of the power converter with one another to communicate a ground point associated with the input ports of the converter (and the source) to the load. Further, in at least some embodiments, the method includes providing common mode filter inductors as part of the converter, where the inductors are connected at least indirectly to at least one of a rectifier and an inverter of the converter, and communicating a grounded neutral from input ports of the converter to output ports of the converter by way of at least one additional linkage.Type: GrantFiled: March 1, 2006Date of Patent: September 25, 2007Assignee: Rockwell Automation Technologies, Inc.Inventors: Navid Reza Zargari, Steven Carmen Rizzo, Yuan Xiao, Bin Wu