Patents by Inventor Gil Su Lee
Gil Su Lee 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: 8089240Abstract: The method for initially starting the motor improves the reliability to the start of the motor. In particular, even though the external load is at more than a predetermined level, a rotor located at an arbitrary angle can be aligned to an accurate initial position. Moreover, it can prevent the damage of the motor or the damage of the electronic device where the motor is installed. In order to initially align the rotor of the motor, a position on a stationary coordinate system, to which an alignment current of a rotation magnetic field is applied, is varied.Type: GrantFiled: January 30, 2009Date of Patent: January 3, 2012Assignee: LG Electronics Inc.Inventor: Gil Su Lee
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Patent number: 7936141Abstract: A motor driver system includes an excess current sensing device configured to compensate a sensing value depending on a temperature of a motor, and to output the compensated sensing value, the sensing value being obtained from a current value associated with the motor; and a controller configured to stop the motor when the compensated sensing value exceeds a preset excess value.Type: GrantFiled: November 27, 2007Date of Patent: May 3, 2011Assignee: LG Electronics Inc.Inventors: Kyung Hoon Lee, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
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Patent number: 7876018Abstract: A synchronous reluctance motor comprises a stator and a rotor, the rotor comprising: a rotation shaft; a first core having a shaft hole for inserting the rotation shaft at a center thereof, and having a plurality of first flux barrier groups arranged along a circumferential direction of the shaft hole and spacing from each other; and a second core having a receiving hole larger than the shaft hole at a center thereof, and stacked at one side of the first core in an axial line direction. A length of the rotor protruding from a supporting portion can be decreased without reducing a stacked thickness thereof, and a vibration occurrence in a horizontal direction with respect to the rotation shaft can be reduced, thereby enhancing a reliability of the synchronous reluctance motor.Type: GrantFiled: November 1, 2006Date of Patent: January 25, 2011Assignee: LG Electronics Inc.Inventors: Jae-Yoon Oh, Kyung-Hoon Lee, June-Hee Won, Gil-Su Lee, Hyun-Hun Shin, Dal-Ho Cheong, Jun-Ho Ahn
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Patent number: 7852040Abstract: A motor driver system and its control methods are discussed. Even when a command magnetic flux decreases as a motor operates in a field weakening region, a current angle can be maintained always below a limit value, thereby obtaining the stability of the motor control.Type: GrantFiled: November 16, 2007Date of Patent: December 14, 2010Assignee: LG Electronics Inc.Inventors: Kyung Hoon Lee, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
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Patent number: 7791298Abstract: A motor driver system includes an inverter configured to apply a three-phase voltage to a motor; an inverter driver configured to generate a reference voltage to the inverter to control a motor speed to follow a reference speed; and a motor protector configured to control the inverter driver so that a value of the reference voltage is equal to or lower than a predetermined voltage value.Type: GrantFiled: November 27, 2007Date of Patent: September 7, 2010Assignee: LG Electronics Inc.Inventors: Kyung Hoon Lee, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
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Publication number: 20090195198Abstract: The method for initially starting the motor improves the reliability to the start of the motor. In particular, even though the external load is at more than a predetermined level, a rotor located at an arbitrary angle can be aligned to an accurate initial position. Moreover, it can prevent the damage of the motor or the damage of the electronic device where the motor is installed. In order to initially align the rotor of the motor, a position on a stationary coordinate system, to which an alignment current of a rotation magnetic field is applied, is varied.Type: ApplicationFiled: January 30, 2009Publication date: August 6, 2009Inventor: Gil Su LEE
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Publication number: 20090184673Abstract: A motor driver system includes an excess current sensing device configured to compensate a sensing value depending on a temperature of a motor, and to output the compensated sensing value, the sensing value being obtained from a current value associated with the motor; and a controller configured to stop the motor when the compensated sensing value exceeds a preset excess value.Type: ApplicationFiled: November 27, 2007Publication date: July 23, 2009Applicant: LG Electronics Inc.Inventors: Kyung Hoon LEE, June Hee WON, Gil Su LEE, Jun Ho AHN, Jae Yoon OH
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Patent number: 7501776Abstract: An apparatus and method for controlling high speed operation of a motor for controlling high speed operation of a motor by estimating the position and the speed of the rotor of a synchronous motor without a PI regulator to eliminate the users' inconvenience and to secure the reliability of the control of a rotor's position and speed of a synchronous motor, which includes: a reference frame transformer that receives triangular coordinate voltages and currents and converts them to static coordinate voltages and currents, a flux observer that receives the converted static coordinate voltages and currents and observes and outputs the flux of the stator, a position estimator that receives the converted static coordinate currents and the observed flux of the stator and estimates and outputs the position of the rotor, and a speed estimator that receives the estimated position of the rotor and estimates and outputs the speed of the rotor.Type: GrantFiled: April 23, 2007Date of Patent: March 10, 2009Assignee: LG Electronics Inc.Inventors: Gil-Su Lee, Kyung-Hoon Lee, Dal-Ho Cheong
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Publication number: 20080297097Abstract: A motor driver system and its control methods are discussed. Even when a command magnetic flux decreases as a motor operates in a field weakening region, a current angle can be maintained always below a limit value, thereby obtaining the stability of the motor control.Type: ApplicationFiled: November 16, 2007Publication date: December 4, 2008Applicant: LG Electronics Inc.Inventors: Kyung Hoon LEE, June Hee Won, Gil Su Lee, Jun Ho Ahn, Jae Yoon Oh
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Publication number: 20080297085Abstract: A motor driver system includes an inverter configured to apply a three-phase voltage to a motor; an inverter driver configured to generate a reference voltage to the inverter to control a motor speed to follow a reference speed; and a motor protector configured to control the inverter driver so that a value of the reference voltage is equal to or lower than a predetermined voltage value.Type: ApplicationFiled: November 27, 2007Publication date: December 4, 2008Inventors: Kyung Hoon LEE, June Hee WON, Gil Su LEE, Jun Ho AHN, Jae Yoon OH
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Patent number: 7459821Abstract: A PMA (Permanent Magnet Assisted) synRM and a method for imposing a magnetic force thereon. Magnets are inserted into outer flux barriers of a plurality of flux barriers formed along the radius of a rotor, and bridges or slim portions are formed on inner flux barriers at positions corresponding to the positions of the magnets so that the magnetic force is imposed on the magnets through coils. Since the number of the flux barriers is sufficiently increased while the amount of the magnets consumed is decreased, the PMA synRM has increased efficiency and reduced production costs.Type: GrantFiled: January 4, 2005Date of Patent: December 2, 2008Assignee: LG Electronics Inc.Inventors: Dal Ho Cheong, Kyung Hoon Lee, Hyun Hun Shin, June Hee Won, Jae Yoon Oh, Gil Su Lee
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Publication number: 20070257626Abstract: An apparatus and method for controlling high speed operation of a motor for controlling high speed operation of a motor by estimating the position and the speed of the rotor of a synchronous motor without a PI regulator to eliminate the users' inconvenience and to secure the reliability of the control of a rotor's position and speed of a synchronous motor, which includes: a reference frame transformer that receives triangular coordinate voltages and currents and converts them to static coordinate voltages and currents, a flux observer that receives the converted static coordinate voltages and currents and observes and outputs the flux of the stator, a position estimator that receives the converted static coordinate currents and the observed flux of the stator and estimates and outputs the position of the rotor, and a speed estimator that receives the estimated position of the rotor and estimates and outputs the speed of the rotor.Type: ApplicationFiled: April 23, 2007Publication date: November 8, 2007Applicant: LG ELECTRONICS INC.Inventors: Gil-Su LEE, Kyung-Hoon LEE, Dal-Ho CHEONG
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Patent number: 7271562Abstract: Disclosed is a method and device for controlling the startup of a synchronous reluctance motor.Type: GrantFiled: November 8, 2005Date of Patent: September 18, 2007Assignee: LG Electronics Inc.Inventors: Gil-su Lee, Dal-ho Cheong, Kyung-hoon Lee
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Publication number: 20070120434Abstract: A synchronous reluctance motor comprises a stator and a rotor, the rotor comprising: a rotation shaft; a first core having a shaft hole for inserting the rotation shaft at a center thereof, and having a plurality of first flux barrier groups arranged along a circumferential direction of the shaft hole and spacing from each other; and a second core having a receiving hole larger than the shaft hole at a center thereof, and stacked at one side of the first core in an axial line direction. A length of the rotor protruding from a supporting portion can be decreased without reducing a stacked thickness thereof, and a vibration occurrence in a horizontal direction with respect to the rotation shaft can be reduced, thereby enhancing a reliability of the synchronous reluctance motor.Type: ApplicationFiled: November 1, 2006Publication date: May 31, 2007Applicant: LG ELECTRONICS INC.Inventors: Jae-Yoon OH, Kyung-Hoon LEE, June-Hee WON, Gil-Su LEE, Hyun-Hun SHIN, Dal-Ho CHEONG, Jun-Ho AHN
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Patent number: 7138777Abstract: A sensorless motor drive apparatus and a method for protecting and controlling the same. The sensorless motor drive apparatus includes a unit for determining the presence or absence of a position estimation error of a rotor contained in a motor using a current value applied to the motor and a position estimation angle of the rotor. Therefore, the sensorless motor drive apparatus determines the presence or absence of the position estimation error of the rotor without using a sensor, so that it reduces production costs, prevents the motor from generating a faulty operation, and prevents a compressor including the motor from being damaged.Type: GrantFiled: January 19, 2005Date of Patent: November 21, 2006Assignee: LG Electronics Inc.Inventors: June Hee Won, Jae Yoon Oh, Gil Su Lee, Dal Ho Cheong, Kyung Hoon Lee
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Publication number: 20060119305Abstract: Disclosed is a method and device for controlling the startup of a synchronous reluctance motor.Type: ApplicationFiled: November 8, 2005Publication date: June 8, 2006Inventors: Gil-su Lee, Dal-ho Cheong, Kyung-hoon Lee