Patents Assigned to LG Industrial Systems Co., Ltd.
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Publication number: 20050068701Abstract: Disclosed is a resistive superconducting fault current limiter capable of enhancing a current of a superconducting device thereof, capable of preventing heat generated at a linear coil, capable of removing a magnetic field generated through the linear coil when a normal current is applied to a circuit of a power system, and capable of using not only a BISCCO based superconducting device but also a YBCO based superconducting device with using a magnet generating device separated from the circuit of the power system so that a current of the power system can not flow to the linear coil of the resistive superconducting fault current limiter when a normal current flows to the power system.Type: ApplicationFiled: September 24, 2004Publication date: March 31, 2005Applicant: LG Industrial Systems Co., Ltd.Inventors: Bang-Wook Lee, Kwon-Bae Park
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Patent number: 6828744Abstract: A motor torque control apparatus and method are disclosed. By adding the value of the compensation voltage which is obtained by proportionally integrating a difference value between the predetermined reference magnetic flux component current value and the actually measured magnetic flux component current value to the q-axis instructing voltage, the magnetic flux component current, that is, the excitation current, can be constantly controlled without excess or shortage. In addition, since the magnetic flux is constantly controlled irrespective of the speed of the motor, a high torque can be generated even at the initial stage of starting of the motor (at the low speed), and thus, the torque of the motor can be smoothly controlled in every operation range from a low speed to a high speed.Type: GrantFiled: February 24, 2003Date of Patent: December 7, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Seung-Ho Na
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Publication number: 20040212943Abstract: Disclosed is a main switch conveying apparatus for a vacuum circuit breaker.Type: ApplicationFiled: April 13, 2004Publication date: October 28, 2004Applicant: LG Industrial Systems Co., Ltd.Inventor: Seok-Jung Yoon
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Publication number: 20040189316Abstract: Disclosed is a method of diagnosing inverter trouble capable of improving convenience of use and safety of the user by notifying the user of the error of switching devices used for outputting AC voltage of the inverter and the earth fault of an output of the inverter when applying power to the inverter.Type: ApplicationFiled: March 9, 2004Publication date: September 30, 2004Applicant: LG Industrial Systems Co., Ltd.Inventor: Min-Keuk Kim
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Patent number: 6792042Abstract: The present invention relates to a pulse width modulation control system which is capable of preventing arm short phenomenon and controlling a operation circuit precisely by securing dead time. The present invention comprises a counter which sets initial voltage value differently and outputs chopping wave crossed at its maximum voltage value and minimum voltage value, an adder/subtracter which adds/subtracts signal generated by the counter, a reference voltage value generation unit which is inputted signal outputted from the adder/subtracter and outputs two different reference voltage values to single chopping wave, a comparator which compares reference voltage value generated by the reference voltage value generation unit with voltage value outputted from the adder/subtracter, and an output control unit which outputs PWM (Pulse Width Modulation) positive signal (SPWM+) or PWM (Pulse Width Modulation) negative signal (SPWM−) in accordance with the output voltage value of the comparator.Type: GrantFiled: July 7, 2000Date of Patent: September 14, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Gyu Sung Bae
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Patent number: 6787725Abstract: A switching mechanism of a circuit breaker for a gas insulated switchgear is able to extinguish arc gas by changing a volume of a compressing chamber without increasing a stroke of a movable cylinder and without increasing required output power of an actuator.Type: GrantFiled: March 14, 2003Date of Patent: September 7, 2004Assignee: LG Industrial Systems Co., Ltd.Inventors: Duk-Rae Kim, Sung-Mo Kang
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Patent number: 6772242Abstract: The present invention relates to a communication device using three-step communication buffers which temporarily stores received data or data to be transmitted between a serial communication device and a central processing unit. To prevent an error resulted from that the serial communication device and the central processing unit simultaneously access to the communication buffer, the access to the communication buffer is allowed at different edges of the system clock signal, thereby having a time difference of the access.Type: GrantFiled: February 24, 2003Date of Patent: August 3, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Young-Joon Lee
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Patent number: 6759617Abstract: A vacuum circuit breaker includes a plurality of switching mechanism units having movable contacts and stationary contacts for connecting/breaking an electrical circuit between an electric source and an electric load, respectively, and disposed in a lengthwise direction; an actuator unit including at least one rotary shaft for providing the movable contacts with dynamic power so as to move to positions contacting the stationary contacts or positions separating from the stationary contacts; a supporting frame for fixing and supporting the switching mechanism units and the actuator unit; and a transfer link unit for transferring rotating movement of the rotary shaft to a plurality of vertical movements, whereby the vacuum circuit breaker can be easily installed in a power distributing cabinet and the power of the actuator unit can be evenly transmitted to the plurality of switching mechanism units.Type: GrantFiled: December 3, 2001Date of Patent: July 6, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Seok Jung Yoon
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Publication number: 20040114293Abstract: Disclosed is an accessory device for a manual motor starter attached to one side of a body of the manual motor starter so as to perform various accessory functions, such as a forcible trip function for the manual motor starter by remotely switching the manual motor starter or a trip function for the manual motor starter when under-voltage occurs between a power source and load. A remotely switchable trip function and an under-voltage trip function are achieved by using one accessory device.Type: ApplicationFiled: December 8, 2003Publication date: June 17, 2004Applicant: LG Industrial Systems Co., Ltd.Inventor: Ho Soung Kim
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Publication number: 20040114295Abstract: Disclosed is a display device for a thermal magnetic type molded case circuit breaker capable to display a phase deficiency occurred on a line to a user such that the user rapidly deals with the phase deficiency and prevents loss caused by over-heating generated due to the phase deficiency. The thermal magnetic type molded case circuit breaker has a bimetal, which is bendable when heat is applied thereto, and a shifter coupled to an upper end of the bimetal and horizontally moved corresponding to a bending degree of the bimetal when over-current is applied thereto. The display device includes a power source for supplying electric power, a display for displaying the phase deficiency of the thermal magnetic type molded case circuit breaker by receiving power from the power source, a stationary contactor electrically connected to the power source and having a stationary contact, and a movable contactor electrically connected to the display and having a movable contact.Type: ApplicationFiled: December 2, 2003Publication date: June 17, 2004Applicant: LG Industrial Systems Co., Ltd.Inventor: Ho Soung Kim
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Publication number: 20040095223Abstract: A thermal overload relay comprises an actuating mechanism for generating power when an abnormal stat is occurred between a power source and an electrical load, and a switching mechanism for switching contacts on state or off state according to the power transferred from the actuating mechanism. The actuating mechanism includes a plurality of main bimetals arranged in parallel to the bottom surface of the case for being bended when the abnormal state is occurred; a plurality of heating member connected to the power source, each heating member is wound around the corresponding main bimetal for transferring heat occurred due to the abnormal state to the main bimetal; a shifter positioned to be contacted one ends of the main bimetals in parallel to the bottom surface of the case for being horizontally movable by the bending force of the main bimetals; and a lever connected to the shifter for transferring the movement force from the shifter to the switching mechanism.Type: ApplicationFiled: October 29, 2003Publication date: May 20, 2004Applicant: LG Industrial Systems Co., Ltd.Inventor: Kyung Ku Lee
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Patent number: 6734768Abstract: In a remote controller of a circuit breaker capable of making an maintenance man control a circuit breaker instantly and safely at any place without approaching a certain area such as a control board or a control room, the circuit breaker includes a receiver for receiving a radio control signal for turning on/off or tripping a circuit breaker; a control unit for generating a first control signal or a second control signal depending on the radio control signal inputted from the receiver; a motor driver for controlling the on/off operation of the circuit breaker depending on the first control signal; and a trip unit for tripping the circuit breaker depending on the second control signal.Type: GrantFiled: August 22, 2002Date of Patent: May 11, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Ki Young Kim
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Patent number: 6693502Abstract: An air circuit breaker which includes an interlock apparatus which is capable of controlling translocation accurately by preventing deformation and the bending of a lead bar and by minimizing the tolerance in production by constructing the lead bar as two separated bodies and including a guide means for guiding the movement of the lead bar. The interlock apparatus is installed to a base frame for indicating the position of the breaker body, such as a disconnected position in which the breaker body is totally separated from the cradle, a tesing position for testing the breaker body and a connected position in which the breaker is connected to the cradle.Type: GrantFiled: November 30, 2001Date of Patent: February 17, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Ki Soo Yang
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Patent number: 6689980Abstract: A circuit breaker having a hybrid arc-extinguishing function includes: an upper shell; a lower shell coupled to the upper shell to form an extinguishing chamber (S) filled with an insulation gas; a movable electrode movably installed at the upper shell and having an exhaust channel for discharging a gas inside the extinguishing chamber (S) outwardly; a fixed electrode having an exhaust channel fixed at the lower shell and positioned at a coaxial line with the movable electrode, through which the gas inside the extinguishing chamber (S) is discharged outwardly, the movable electrode being movable being movable to a position where it contacts with the fixed electrode and to a positioned where it is separated from the fixed electrode; a magnetic coil arranged around the fixed electrode to form a magnetic field for a rotation of an arc, and receiving a conductive current from the movable electrode as being shared with the fixed electrode when the movable electrode is positioned contacting with the fixed electrodeType: GrantFiled: September 24, 2001Date of Patent: February 10, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Jong Mahn Sohn
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Patent number: D494132Type: GrantFiled: April 18, 2003Date of Patent: August 10, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Hyun Sung Song
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Patent number: D494133Type: GrantFiled: April 18, 2003Date of Patent: August 10, 2004Assignee: LG Industrial Systems, Co., Ltd.Inventor: Hyun Sung Song
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Patent number: D498212Type: GrantFiled: April 18, 2003Date of Patent: November 9, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Han Byul Kim
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Patent number: D498464Type: GrantFiled: April 10, 2003Date of Patent: November 16, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Ho Seong Kim
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Patent number: D498465Type: GrantFiled: April 18, 2003Date of Patent: November 16, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Ho Seong Kim
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Patent number: D499701Type: GrantFiled: April 18, 2003Date of Patent: December 14, 2004Assignee: LG Industrial Systems Co., Ltd.Inventor: Han Byul Kim