Patents by Inventor Kum Kang Huh

Kum Kang Huh 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).

  • Patent number: 9966897
    Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: May 8, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Kum-Kang Huh
  • Patent number: 9960687
    Abstract: According to some embodiments, an electronic drive circuit is disclosed. The electronic drive circuit includes an energy storage device and a first bridge circuit coupled to the energy storage device. The first bridge circuit includes at least one leg having two switches. The electronic drive circuit also includes a transformer. The transformer includes a first winding coupled to the first bridge circuit and a second winding coupled to the energy storage device through a center tap. The electronic drive circuit further includes a second bridge circuit coupled to the second winding of the transformer. The second bridge circuit includes a pair of switches operable to conduct in both directions and block voltage in both directions.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: May 1, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Ahmed Elasser, Mohammed Agamy, Kum Kang Huh
  • Publication number: 20180109218
    Abstract: A system and method for position sensorless control of an AC electric machine is disclosed. A drive system for driving an AC electric machine provides a primary current excitation to drive the AC electric machine, the primary current excitation comprising a current vector having a magnitude and angle. The drive system injects a carrier signal to the AC electric machine that is superimposed onto the current vector, with the carrier signal being selected to generate a carrier response signal that has sensitivity to magnetic alignment information of the AC electric machine at its operating point. The drive system measures at least one magnetic alignment signature of the AC electric machine from the generated carrier response signal and controls an orientation of the current vector using the measured at least one magnetic alignment signature, so as to achieve a desired magnetic operation of the AC electric machine.
    Type: Application
    Filed: October 17, 2016
    Publication date: April 19, 2018
    Inventors: Kum-Kang Huh, Di Pan
  • Publication number: 20180109219
    Abstract: A system and method for position sensorless control of an AC electric machine is disclosed. A drive system for driving an AC electric machine provides a primary current excitation to drive the AC electric machine, the primary current excitation comprising a current vector having a magnitude and angle. The drive system injects a carrier signal to the AC electric machine that is superimposed onto the current vector, with the carrier signal generating a carrier response signal responsive to the injected carrier signal. The drive system measures at least one magnetic alignment signature of the AC electric machine from the generated carrier response signal and controls an orientation of the current vector using the measured at least one magnetic alignment signature to operate the AC electric machine.
    Type: Application
    Filed: October 16, 2017
    Publication date: April 19, 2018
    Inventors: Kum-Kang Huh, Di Pan
  • Patent number: 9948224
    Abstract: A system and method for position sensorless control of an AC electric machine is disclosed. A drive system for driving an AC electric machine provides a primary current excitation to drive the AC electric machine, the primary current excitation comprising a current vector having a magnitude and angle. The drive system injects a carrier signal to the AC electric machine that is superimposed onto the current vector, with the carrier signal being selected to generate a carrier response signal that has sensitivity to magnetic alignment information of the AC electric machine at its operating point. The drive system measures at least one magnetic alignment signature of the AC electric machine from the generated carrier response signal and controls an orientation of the current vector using the measured at least one magnetic alignment signature, so as to achieve a desired magnetic operation of the AC electric machine.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: April 17, 2018
    Assignee: General Electric Company
    Inventors: Kum-Kang Huh, Di Pan
  • Patent number: 9941775
    Abstract: An assembly includes multiple adjoined rotor sections each having multiple poles and multiple void rows therethrough that are radially distributed in each of the poles. The rotor sections are skewed in a circumferential direction. The assembly also has multiple conductive rings that substantially surround one of the void rows. A method of assembly and electric machines and vehicles using the assembly are also disclosed. Aspects reduce torque ripple in electric machines and allow for encoderless/sensorless operation in an electric machine using the rotor assembly. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: April 10, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Alexander Felix Fiseni, Kum-Kang Huh, Mohamed Osama, Francesco Papini
  • Publication number: 20180094512
    Abstract: A system including a control system is provided. The control system includes a main drive that receives power from a power source and outputs a variable frequency and a variable amplitude AC voltage. The control system also includes a controller to interface with the main drive and an electric machine. The controller receives one or more electrical signals associated with an operating condition of the electric machine from one or more sensors disposed between the electric machine and the main drive. The controller determines correction information based on the received electrical signals and based on a desired operating condition of the electric machine. The controller transmits the correction information to the main drive. The correction information corresponds to a rotor position of the electric machine or operating commands configured to implement the desired operating condition of the electric machine.
    Type: Application
    Filed: September 30, 2016
    Publication date: April 5, 2018
    Inventors: Tomas Sadilek, Nathaniel Benedict Hawes, David Allan Torrey, Di Pan, Kum Kang Huh
  • Publication number: 20180097466
    Abstract: A method of controlling an electric motor assembly includes detecting a backspin event of an electric motor, and managing a response to the detected backspin event of the electric motor. The backspin event of the electric motor is detected based at least in part on feedback from a sensor configured to measure a current or a voltage on a cable coupled to the electric motor. The response includes communicating an alert to personnel, controlling the voltage on the cable to be less than a voltage threshold, or any combination thereof.
    Type: Application
    Filed: September 30, 2016
    Publication date: April 5, 2018
    Inventors: Kum Kang Huh, David Allan Torrey, Di Pan, Nathaniel Benedict Hawes, Tomas Sadilek
  • Patent number: 9903373
    Abstract: An electric submersible pump (ESP) control system includes a primary variable frequency drive (VFD), a transformer, and a secondary VFD. The primary variable frequency drive (VFD) is configured to receive power from a power source and output a variable voltage and variable amplitude AC voltage. The transformer has a low voltage side and a high voltage side of the transformer. The primary VFD is coupled to the low voltage side. The transformer is configured to receive the AC voltage from the primary VFD and output a stepped up AC voltage. The secondary VFD is coupled to the high voltage side of the transformer, wherein the secondary VFD is configured to provide a supplemental voltage in addition to the stepped up AC voltage when the operational values of an electric motor exceed a threshold value.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: February 27, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Nathaniel Benedict Hawes, Kum Kang Huh, David Allen Torrey, Di Pan, Tomas Sadilek
  • Patent number: 9906108
    Abstract: An electric machine that includes a rotor core made of magnetic steel; a stator configured with stationary windings therein; openings disposed within or on the rotor core; and a rotor circuit that is configured to introduce saliency based on an orientation of part of the rotor circuit in relationship to a pole location of the electric machine, where the rotor circuit is made of a conductive, non-magnetic material. A rotor component and various embodiments of electric machines are also disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: February 27, 2018
    Assignee: General Electric Company
    Inventors: Kum Kang Huh, Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Patrick Lee Jansen, Roy David Schultz, Lembit Salasoo
  • Patent number: 9871418
    Abstract: A rotor component that comprises a rotor circuit configured for use with either an interior permanent magnet (IPM) machine or a synchronous reluctance machine (SRM) that includes a pole circuit made of a conductive, non-magnetic material and has a midpoint that substantially aligns with a d-axis of the IPM or SRM. An electric machine with a similar rotor component therein or having a loop or ring of a conductive, non-magnetic material that is substantially concentric about a d-axis of the electric machine.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 16, 2018
    Assignee: General Electric Company
    Inventors: Kum Kang Huh, Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Patrick Lee Jansen, Roy David Schultz, Lembit Salasoo
  • Publication number: 20170353111
    Abstract: According to some embodiments, an electronic drive circuit is disclosed. The electronic drive circuit includes an energy storage device and a first bridge circuit coupled to the energy storage device. The first bridge circuit includes at least one leg having two switches. The electronic drive circuit also includes a transformer. The transformer includes a first winding coupled to the first bridge circuit and a second winding coupled to the energy storage device through a center tap. The electronic drive circuit further includes a second bridge circuit coupled to the second winding of the transformer. The second bridge circuit includes a pair of switches operable to conduct in both directions and block voltage in both directions.
    Type: Application
    Filed: June 6, 2016
    Publication date: December 7, 2017
    Applicant: General Electric Company
    Inventors: Ahmed Elasser, Mohammed Agamy, Kum Kang Huh
  • Patent number: 9809119
    Abstract: A bi-directional DC-DC converter assembly that processes and transfers differential power in a variable manner is disclosed. The converter assembly is coupled to an energy storage device and DC link, with the converter assembly including a first converter section coupled to the energy storage device and a second converter section coupled to the DC link and to the energy storage device. The converter assembly processes a first portion of the DC power output of the energy storage device and provides an unprocessed second portion of the DC power output of the energy storage device to the second converter section when providing power to the load, and processes a first portion of a regenerative power from the load and provides an unprocessed second portion of the regenerative power from the load to the first converter section when providing regenerative power to the energy storage device.
    Type: Grant
    Filed: January 13, 2015
    Date of Patent: November 7, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Xu She, Robert Dean King, Kum-Kang Huh
  • Publication number: 20170305283
    Abstract: According to some embodiments, a traction system is disclosed. The traction system includes a DC bus, an energy storage device coupled to the DC bus, and a voltage converter assembly coupled to the energy storage device. The voltage converter assembly includes a plurality of phase legs. The traction system further includes an electromechanical device including a plurality of windings coupled to the voltage converter assembly. The traction system also includes a switch coupled to the DC bus between the voltage converter assembly and the energy storage device. The traction system includes a controller configured to control the switch and the voltage converter assembly such that a phase leg and a winding of the electromechanical device form a DC/DC converter.
    Type: Application
    Filed: April 25, 2016
    Publication date: October 26, 2017
    Applicant: General Electric Company
    Inventors: Kum Kang Huh, Di Pan
  • Publication number: 20170244353
    Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
    Type: Application
    Filed: May 5, 2017
    Publication date: August 24, 2017
    Applicant: General Electric Company
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi EL-Refaie, Kum-Kang Huh
  • Patent number: 9742228
    Abstract: An electric machine, such as an Internal Permanent magnet or Synchronous Reluctance machine, having X phases, that includes a stator assembly, having M slots, with a stator core and stator teeth, that is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface that defines a cavity; and a rotor assembly, having N poles, disposed within the cavity which is configured to rotate about the longitudinal axis, wherein the rotor assembly includes a shaft, a rotor core located circumferentially around the shaft. The machine is configured such that a value k=M/(X*N) wherein k is a non-integer greater than about 1.3. The electric machine may alternatively, or additionally, include a non-uniformed gap between the exterior surface of the rotor spokes and the interior stator surface of the stator.
    Type: Grant
    Filed: October 18, 2013
    Date of Patent: August 22, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Patel Bhageerath Reddy, Kum-Kang Huh, Ayman Mohamed Fawzi El-Refaie, Steven Joseph Galioto
  • Publication number: 20170234285
    Abstract: According to some embodiments, a start-stop system for a vehicle is disclosed. The start-stop system includes a first energy storage device coupled to a starter motor. The start-stop system also includes a first DC-to-AC inverter coupled to the first energy storage device, a starter/alternator coupled to the first DC-to-AC inverter, and a second DC-to-AC inverter coupled to the starter/alternator. The start-stop system further includes a second energy storage device coupled to the second DC-to-AC inverter. The start-stop system finally includes a controller configured to control the two DC-to-AC inverters such that either the starter motor or starter/alternator starts the vehicle based on the state of charge of the second energy storage device.
    Type: Application
    Filed: February 17, 2016
    Publication date: August 17, 2017
    Applicant: General Electric Company
    Inventors: Kum Kang Huh, Di Pan
  • Patent number: 9698660
    Abstract: A system and method for heating ferrite permanent magnets in an electrical machine is disclosed. The permanent magnet machine includes a stator assembly and a rotor assembly, with a plurality of ferrite permanent magnets disposed within the stator assembly or the rotor assembly to generate a magnetic field that interacts with a stator magnetic field to produce a torque. A controller of the electrical machine is programmed to cause a primary field current to be applied to the stator windings to generate the stator magnetic field, so as to cause the rotor assembly to rotate relative to the stator assembly. The controller is further programmed to cause a secondary current to be applied to the stator windings to selectively generate a secondary magnetic field, the secondary magnetic field inducing eddy currents in at least one of the stator assembly and the rotor assembly to heat the ferrite permanent magnets.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: July 4, 2017
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Kum-Kang Huh
  • Publication number: 20170146015
    Abstract: An electric submersible pump (ESP) control system includes a primary variable frequency drive (VFD), a transformer, and a secondary VFD. The primary variable frequency drive (VFD) is configured to receive power from a power source and output a variable voltage and variable amplitude AC voltage. The transformer has a low voltage side and a high voltage side of the transformer. The primary VFD is coupled to the low voltage side. The transformer is configured to receive the AC voltage from the primary VFD and output a stepped up AC voltage. The secondary VFD is coupled to the high voltage side of the transformer, wherein the secondary VFD is configured to provide a supplemental voltage in addition to the stepped up AC voltage when the operational values of an electric motor exceed a threshold value.
    Type: Application
    Filed: November 19, 2015
    Publication date: May 25, 2017
    Inventors: Nathaniel Benedict Hawes, Kum Kang Huh, David Allen Torrey, Di Pan, Tomas Sadilek
  • Patent number: 9602043
    Abstract: A magnet management method of controlling a ferrite-type permanent magnet electrical machine includes receiving and/or estimating the temperature permanent magnets; determining if that temperature is below a predetermined temperature; and if so, then: selectively heating the magnets in order to prevent demagnetization and/or derating the machine. A similar method provides for controlling magnetization level by analyzing flux or magnetization level. Controllers that employ various methods are disclosed. The present invention has been described in terms of specific embodiment(s), and it is recognized that equivalents, alternatives, and modifications, aside from those expressly stated, are possible and within the scope of the appending claims.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: March 21, 2017
    Assignee: General Electric Company
    Inventors: Patel Bhageerath Reddy, Ayman Mohamed Fawzi El-Refaie, Kum Kang Huh