Hyundai Motor Company

Kia Motors Corporation

Daewoo Electronics Co., Ltd.

Chungbuk National University Industry-academic Cooperation Foundation

Hee-Sung Yoon

Young Jin Seo

Dongyeon Han

Shin Gyu Kim

Myeong Kyu Jung

Young-Kyun Son

Chan-Hyuk Park

Chang-Seop Koh

Sung-Hyun Cho

Kwang-Young Jeong

A method and a system for verifying normal operation of a negative pressure sensor of a brake booster is provided. The method and system verify whether the negative pressure sensor of the brake booster is in normal operation and the normal operation of the booster negative pressure sensor is detected by mutually verifying values measured by the booster negative pressure sensor and values measured by sensors that indirectly sense the booster negative pressure.

Method and system for verifying normal operation of negative pressure sensor of brake booster

A structure for measuring iron loss of a motor stator core is provided. The structure includes an auxiliary core whose both end surfaces in a longitudinal direction come in contact with inner end surfaces of two adjacent stator teeth among a plurality of stator teeth in a radial direction in order to measure iron loss of a stator core in which a plurality of slots and the plurality of stator teeth are alternately formed on an inner circumferential surface of a stator yoke in a circumferential direction. A pair of excitation windings is provided at portions of the auxiliary core in the longitudinal direction spaced-apart from each other. A B-coil that is a sensor coil is provided at the auxiliary core so as to be positioned inside any one excitation winding of the pair of excitation windings. Fixing protrusions protrude from the both end surfaces of the auxiliary core to extend in the longitudinal direction, and inserted into the slot between the two adjacent stator teeth to be fitted and fixed in the circumferential direction. Accordingly, it is possible to quantitatively and accurately measure iron loss of the motor stator core for each manufacturing process.

Structure of measuring iron loss of motor stator core

An apparatus for measuring a thickness of a coating formed on a surface of a component member includes a white light source for emitting a light beam to be reflected by the surface of the member, one or more filters, each of the filters capable of filtering the reflected light beam in a selected wavelength range, an identical number of photo-detection sections as filters, each of the photo-detection sections being used for converting the intensity of the filtered light beam into a counting reference signal having a logic high and low states, a counter for counting the logic high states to generate a count number and a signal processor for computing the coating thickness based on the count number. Each of the photo-detection sections has a photo-detector, an ampere-to-voltage convertor, a peak voltage value detector and a comparator.

Apparatus for automatically measuring the thickness of a transparent

A video cassette player includes a main base, a head drum assembly including a rotary drum, a stationary drum, a rotating shaft and a driven gear pressed on and fixed to a lower end portion of the rotating shaft, a capstan motor provided with a capstan shaft, a driving pulley fixed to a lower end portion of the capstan shaft, an idler assembly provided with a bracket, a hinge shaft, an idle gear, an intermediate gear and a first driven pulley, a driving assembly including a shaft, a driving gear and a second driven pulley, and a first and a second belts. The shaft of the driving gear assembly is rotatably fixed to the main base, and the driving gear and the second driven pulley are, in turn, fixed to a lower portion of the shaft, the driving gear being engaged with the driven gear of the head drum assembly. The first and second driven pulleys are coupled to and rotated simultaneously by the driving pulley through the first and the second belts, respectively, so that the rotary drum as well as the idle gear are rotated by the capstan motor.

Video cassette player with rotary drum rotated by a capstan motor

Growing community of inventors

Seoul, South Korea

Hee-Sung Yoon