Industry-University Cooperation Foundation Hanyang University

Samsung Electronics Co., Ltd.

Korea University Research and Business Foundation

Hyosung Heavy Industries Corporation

Ju Seop Lee

Sung Hwan Won

In Gun Kim

Min Jae Kim

Dong Woo Kang

Young Jae Park

Sin-Ae Kim

Hyo Won Sin

Sung Hong Won

Jongheun Lee

Hyun Seok Hong

Jeong Ho Seo

Huai Cong Liu

A reflectionless frequency filter circuit is provided. The reflectionless frequency filter circuit may include a first partial circuit including a first inductor and a first resistor connected in parallel with the first inductor, a first inverter connected in parallel with the first partial circuit, and a third partial circuit connected in series with the first inverter, and the third partial circuit may include a third inductor and a third resistor formed in a branch line between the first inverter and the third inductor.

Frequency filter circuit

Disclosed are a slotless electric motor and a coil unit thereof. In the coil unit of the slotless electric motor, a first coil and a second coil overlap each other while a first end turn of the first coil and a first end turn of the second coil face each other and a first coil-side of the second coil is inserted between two coil-sides of the first coil, wherein each of the first coil and the second coil comprises two coil-sides parallel to each other, ends of the two coil-sides are connected through a first end turn and a second end turn having a curved shape, respectively, and the first end turn is bent to make a pre-configured angle with respect to the two coil-sides.

Slotless electric motor and coil unit thereof

A rotor of a line-start synchronous reluctance motor is provided, which includes: a laminated core comprising multiple laminated core sheets having multiple rotor bar holes formed therein in proximity to the circumference thereof, respectively; end plates fixed to both sides of the laminated core, respectively; rotor bars inserted into the rotor bar holes, respectively; and a rotating shaft coupled to the laminated core to be able to rotate integrally, wherein the core sheets comprise multiple flux barriers and steel plate portions on which the flux barriers are not formed, respectively, and extended ends of the flux barriers may be positioned between the rotor bar holes.

Line-start synchronous reluctance motor and rotor thereof

A device and control method for driving a sensorless brushless DC (BLDC) motor, particularly related to a technology configured to increase the accuracy of detection of Zero Cross Point through a non-commutation period in a pulse width modulation (PWM) control. The device for driving a sensorless BLDC motor to switch a current applied to a stator winding based on a position of a rotor includes a three phase inverter configured to convert a DC input voltage into a three phase AC voltage and supply the three phase AC voltage to the BLDC motor; a terminal voltage detector configured to detect a three phase terminal voltage from an output terminal of the three phase inverter; and a controller configured to perform a PWM control of the terminal voltage based on a three phase back electromotive force (EMF) included in the detected terminal voltage. The PWM control includes a non-commutation control in which the switching of the current does not occur.

Device and control method for driving sensorless BLDC motor

A spherical motor rotating in multi degrees of freedom has a reliable capability of determining positioning. The spherical motor includes a hollow spherical-shaped stator installed with a bi-level bobbin wound by coil generating a synthesized magneto-motive force on an inner surface thereof; and a rotor formed inside the stator and rotating around a shaft, wherein a slope of the shaft is adjusted by the synthesized magneto-motive force. Two or more of the bobbins are provided and installed at regular intervals along the inner surface of the stator, and the rotor includes one or more permanent magnets. The spherical motor rotating in multi degrees of freedom, formed with the above mentioned figures, can embody multi degrees of freedom by the interaction between the flowing current in the winding coil around the bobbin and the permanent magnet.

Spherical motor rotating in multiple degrees of freedom

Growing community of inventors

Seoul, South Korea

Ju Seop Lee