Patents by Inventor Tae Kwang Choi

Tae Kwang Choi 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: 11437172
    Abstract: Disclosed is a magnetic force control device improved to be installed even in a narrow space having a small height. The magnetic force control device includes a first pole piece having a first interaction surface, a second pole piece having a second interaction surface, a third pole piece connected to the second pole piece, a coil wound around at least one of the second pole piece and the third pole piece, a stationary magnet fixed between the first pole piece and the second pole piece and a rotary magnet disposed between the first pole piece and the third pole piece and configured to be rotatable by controlling a current flowing through the coil.
    Type: Grant
    Filed: February 22, 2021
    Date of Patent: September 6, 2022
    Inventor: Tae Kwang Choi
  • Patent number: 11264157
    Abstract: A magnetic force control device includes a first pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an N pole of a permanent magnet, a second pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an S pole of the permanent magnet or another permanent magnet different from the permanent magnet, rotary permanent magnet configured to be rotatable to define a first arrangement state in which an N pole thereof is magnetically connected to the second pole piece and an S pole thereof is magnetically connected to the first pole piece and a second arrangement state in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: March 1, 2022
    Inventor: Tae Kwang Choi
  • Publication number: 20210272732
    Abstract: A magnetic body holding device includes: a first pole piece having a first interaction surface and a second interaction surface; a second pole piece having a third interaction surface and a fourth interaction surface; a first stationary magnet disposed to be adjacent to the first interaction surface and the third interaction surface; a second stationary magnet disposed to be adjacent to the second interaction surface and the fourth interaction surface; a rotary magnet rotatably disposed between the first stationary magnet and the second stationary magnet; a first coil disposed between the first stationary magnet and the rotary magnet and wound around at least one of the first pole piece and the second pole piece; and a second coil disposed between the second stationary magnet and the rotary magnet and wound around at least one of the first pole piece and the second pole piece.
    Type: Application
    Filed: December 29, 2020
    Publication date: September 2, 2021
    Inventor: Tae Kwang CHOI
  • Publication number: 20210265093
    Abstract: Disclosed is a magnetic force control device improved to be installed even in a narrow space having a small height. The magnetic force control device includes a first pole piece having a first interaction surface, a second pole piece having a second interaction surface, a third pole piece connected to the second pole piece, a coil wound around at least one of the second pole piece and the third pole piece, a stationary magnet fixed between the first pole piece and the second pole piece and a rotary magnet disposed between the first pole piece and the third pole piece and configured to be rotatable by controlling a current flowing through the coil.
    Type: Application
    Filed: February 22, 2021
    Publication date: August 26, 2021
    Inventor: Tae Kwang CHOI
  • Publication number: 20200227191
    Abstract: A magnetic force control device includes a magnetic flow generating section configured to be freely rotatable to at least define a first arrangement state and a second arrangement state and including a permanent magnet, a magnetic flow section having at least one interaction surface and including at least one pole piece made of a magnetic material in which a magnetic flow is formed therein, the pole piece is disposed such that an effect of a magnetic flow from the magnetic flow generating section on the interaction surface is minimized when the magnetic flow generating section defines the first arrangement state, and the effect of the magnetic flow from the magnetic flow generating section on the interaction surface is maximized when the magnetic flow generating section defines the second arrangement state; and at least one coils wound around the pole piece.
    Type: Application
    Filed: December 13, 2018
    Publication date: July 16, 2020
    Inventor: Tae Kwang CHOI
  • Publication number: 20200203048
    Abstract: A magnetic force control device includes a first pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an N pole of a permanent magnet, a second pole piece having an interaction surface, made of a ferromagnetic material, and configured to be in contact with an S pole of the permanent magnet or another permanent magnet different from the permanent magnet, rotary permanent magnet configured to be rotatable to define a first arrangement state in which an N pole thereof is magnetically connected to the second pole piece and an S pole thereof is magnetically connected to the first pole piece and a second arrangement state in which the N pole is magnetically connected to the first pole piece and the S pole is magnetically connected to the second pole piece.
    Type: Application
    Filed: August 3, 2018
    Publication date: June 25, 2020
    Inventor: Tae Kwang CHOI
  • Patent number: 10460864
    Abstract: A magnetic substance holding device includes: a first pole piece assembly including a first N-pole piece, a first S-pole piece, and a first permanent magnet; a second pole piece assembly including a second N-pole piece, a second S-pole piece, and a second permanent magnet; at least one first coil; at least one second coil; and a control device controlling current applied to the first coil and the second coil so as to control magnetic fluxes passing through the first coil and the second coil, thereby allowing the first pole piece assembly and the second pole piece assembly to switch between the first arrangement and the second arrangement, to control magnetic fluxes passing through the holding faces of the first pole piece assembly and the second pole piece assembly.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: October 29, 2019
    Inventor: Tae Kwang Choi
  • Patent number: 10236107
    Abstract: A magnetic flux control device according to the exemplary embodiment includes: a pole piece assembly which is provided with an N pole piece and an S pole piece which are formed with first surfaces and second surfaces and made of a ferromagnetic material, and a permanent magnet which is disposed such that an N-pole is in contact with the N pole piece and an S-pole is in contact with the S pole piece; a first outer pole piece, a second outer pole piece, and a base pole piece which are formed with first surfaces and second surfaces and made of a ferromagnetic material; a coil which is wound around at least one of the N pole piece, the S pole piece, the first outer pole piece, the second outer pole piece, and the base pole piece; and a control unit which controls electric current to be applied to the coil.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: March 19, 2019
    Inventor: Tae Kwang Choi
  • Patent number: 9969061
    Abstract: A magnetic substance holding device includes: a first pole piece assembly comprising at least one first pole piece, at least two second pole pieces, and at least two first permanent magnets; a second pole piece assembly comprising at least one third pole piece, at least two fourth pole pieces, and at least two second permanent magnets; a coil; and a control device. The first pole piece assembly and/or the second pole piece assembly is configured to be movable such that they are switched between a first arrangement in which the second faces of the first pole piece assembly are spaced apart from the first faces of the second pole piece assembly, and a second arrangement in which the second faces of the first pole piece assembly come in contact with the first faces of the second pole piece assembly.
    Type: Grant
    Filed: March 5, 2015
    Date of Patent: May 15, 2018
    Inventor: Tae Kwang Choi
  • Patent number: 9659699
    Abstract: Disclosed herein is a magnetic substance holding device that minimizes residual magnetism by way of employing structures for minimizing reluctance to magnetic flux flow.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: May 23, 2017
    Inventor: Tae Kwang Choi
  • Publication number: 20170133136
    Abstract: A magnetic substance holding device includes: a first pole piece assembly including a first N-pole piece, a first S-pole piece, and a first permanent magnet; a second pole piece assembly including a second N-pole piece, a second S-pole piece, and a second permanent magnet; at least one first coil; at least one second coil; and a control device controlling current applied to the first coil and the second coil so as to control magnetic fluxes passing through the first coil and the second coil, thereby allowing the first pole piece assembly and the second pole piece assembly to switch between the first arrangement and the second arrangement, to control magnetic fluxes passing through the holding faces of the first pole piece assembly and the second pole piece assembly.
    Type: Application
    Filed: January 20, 2017
    Publication date: May 11, 2017
    Inventor: Tae Kwang CHOI
  • Publication number: 20170103839
    Abstract: A magnetic flux control device according to the exemplary embodiment includes: a pole piece assembly which is provided with an N pole piece and an S pole piece which are formed with first surfaces and second surfaces and made of a ferromagnetic material, and a permanent magnet which is disposed such that an N-pole is in contact with the N pole piece and an S-pole is in contact with the S pole piece; a first outer pole piece, a second outer pole piece, and a base pole piece which are formed with first surfaces and second surfaces and made of a ferromagnetic material; a coil which is wound around at least one of the N pole piece, the S pole piece, the first outer pole piece, the second outer pole piece, and the base pole piece; and a control unit which controls electric current to be applied to the coil.
    Type: Application
    Filed: March 3, 2016
    Publication date: April 13, 2017
    Inventor: Tae Kwang CHOI
  • Patent number: 9589715
    Abstract: A magnetic substance holding device includes: a first pole piece assembly including a first N-pole piece, a first S-pole piece, and a first permanent magnet; a second pole piece assembly including a second N-pole piece, a second S-pole piece, and a second permanent magnet; at least one first coil; at least one second coil; and a control device controlling current applied to the first coil and the second coil so as to control magnetic fluxes passing through the first coil and the second coil, thereby allowing the first pole piece assembly and the second pole piece assembly to switch between the first arrangement and the second arrangement, to control magnetic fluxes passing through the holding faces of the first pole piece assembly and the second pole piece assembly.
    Type: Grant
    Filed: December 2, 2014
    Date of Patent: March 7, 2017
    Inventor: Tae Kwang Choi
  • Publication number: 20160207176
    Abstract: A magnetic substance holding device includes: a first pole piece assembly comprising at least one first pole piece, at least two second pole pieces, and at least two first permanent magnets; a second pole piece assembly comprising at least one third pole piece, at least two fourth pole pieces, and at least two second permanent magnets; a coil; and a control device. The first pole piece assembly and/or the second pole piece assembly is configured to be movable such that they are switched between a first arrangement in which the second faces of the first pole piece assembly are spaced apart from the first faces of the second pole piece assembly, and a second arrangement in which the second faces of the first pole piece assembly come in contact with the first faces of the second pole piece assembly.
    Type: Application
    Filed: March 5, 2015
    Publication date: July 21, 2016
    Inventor: Tae Kwang CHOI
  • Publication number: 20160005519
    Abstract: A magnetic substance holding device includes: a first pole piece assembly including a first N-pole piece, a first S-pole piece, and a first permanent magnet; a second pole piece assembly including a second N-pole piece, a second S-pole piece, and a second permanent magnet; at least one first coil; at least one second coil; and a control device controlling current applied to the first coil and the second coil so as to control magnetic fluxes passing through the first coil and the second coil, thereby allowing the first pole piece assembly and the second pole piece assembly to switch between the first arrangement and the second arrangement, to control magnetic fluxes passing through the holding faces of the first pole piece assembly and the second pole piece assembly.
    Type: Application
    Filed: December 2, 2014
    Publication date: January 7, 2016
    Inventor: Tae Kwang CHOI
  • Publication number: 20150367484
    Abstract: Disclosed herein is a magnetic substance holding device that minimizes residual magnetism by way of employing structures for minimizing reluctance to magnetic flux flow.
    Type: Application
    Filed: February 24, 2015
    Publication date: December 24, 2015
    Inventor: Tae Kwang CHOI
  • Publication number: 20150287510
    Abstract: Disclosed herein is a magnetic substance holding device that minimizes residual magnetism by way of employing structures for minimizing reluctance to magnetic flux flow.
    Type: Application
    Filed: February 24, 2015
    Publication date: October 8, 2015
    Inventor: Tae Kwang CHOI
  • Publication number: 20150279541
    Abstract: Disclosed herein is a magnetic substance holding device that minimizes residual magnetism by way of employing structures for minimizing reluctance to magnetic flux flow.
    Type: Application
    Filed: February 24, 2015
    Publication date: October 1, 2015
    Inventor: Tae Kwang CHOI
  • Publication number: 20130135067
    Abstract: The present invention relates to a magnetic substance holder, which includes a permanent magnet, a pole piece coupling one of N and S poles of the permanent magnet and having a holding surface, a magnetizable material having an end surface contacting the pole piece, a coil surrounding the magnetizable material, and a control device controlling electric current flowing through the coil to control the magnetization of the magnetizable material. According to the present invention, optimal holding force can be realized for the same area, and the magnetic substance holder can be readily expanded to a module or be miniaturized according to the size of the interior of a device on which the magnet holder is installed, and can be widely applied to various equipment used in the industrial field such as lifts, chucks, locking devices, applied machines, and robots.
    Type: Application
    Filed: July 29, 2011
    Publication date: May 30, 2013
    Inventor: Tae Kwang Choi