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유도전동기의 가변부하 운전에 대한 정속도 유지를 위한 외란상쇄 관측기의 연구
서영수 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-
This paper designed a robust control of an induction motor using a disturbance cancellation observer of a feedforward control. The speed response of conventional PI controller characteristic is affected by variations of load torque disturbance. In the proposed system, the speed control characteristic using a feedforward control isn't affected by a load torque disturbance. High speed calculation and processing for vector control is carried out by ADMC300 digital signal processor. Validity of the proposed control method is verified through simulation and experimental result.
徐英洙 大田工業高等專門學校 1972 論文集 Vol.9 No.-
At the design of transformer, the object this of thesis is to save a magnetic flux density and a current density by calculation. This design means agree with a regular characteristic value and a calculation value saying a characteristic. The object of calculation is the phase of Øl and 3Ø, and the frequency of 50 and 60[Hz], the capacity of 1~50[KVA], the rectangular core type section, the rectangular coil type. This calculation means is to decide a magnetic flux density and a current density, a core size, a copper weight, a core weight, a copper loss, a core loss, a exciting VA. The data for calculation is a B-H curve and a B-wi curve of core. This new design means is suitably convenient and this means is dissimilar for the traditional means.
Hyperstable MRAS의 역기전력 추정에 의한 유도전동기의 벡터제어
서영수,김영진 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
When the vector control, which does not need a speed signal from a mechanical speed sensor, it is possible to reduce the cost of the control equipment and to improve the control performance in many industrical application. This paper describes the vector control system estimates rotor speed based on MRAS. Because of improving the initial condition and drift problem by pure integrator is eliminated, we can be expected to rapid responsibility of the speed estimation. The stability of speed estimator is proved on the basis of hyperstability theory. In order to confirm the performance of the proposed system, simulation and experiment is performed.
서영수 安東大學 1982 安東大學 論文集 Vol.4 No.1
The objective of the principle of consistency is to give assurance that the comparability of financial statements between periods has not been materially affected by changes in accounting principles and practices and the method of applying them, or if comparablity has been affected by such changes, to require appropriate reporting by the independent auditor regarding such changes. If management has provided reasonable justification for a change from an accounting principle that is generally accepted to one that is generally accepted, the independent auditor should express an unqualified opinion. But management has not provided reasonable justification for a change, the independent auditor should express a qualified opinion or if the effect of the change is sufficiently material, the auditor should express an adverse opinion on the financial statements taken as a whole due to a lack of conformity with generally accepted accounting principles. In this situation, if a obvious definition of reasonable justification for a change has not regulated, management would be apt to modify deliberately the profit and loss earned for specific term. Accordingly, a regulation of the reasonable justification for a change in accounting principles shall be made so that the financial statements may clearly present all relevant information necessary for the making of decisions by the user group.
서영수,최영민,노영식,강희준 대한전기학회 2005 전기학회논문지 D Vol.54 No.2(D)
This paper is concerned with attitude control of 2 rotor 1 DOF aerial vehicle. The proposed controller consists of two parts: the attitude estimation filter part and PID controller part. For attitude estimation, performance of 3 different filters (complementary filters, Kalman filter, indirect Kalman filters) are tested and compared. For the PID controller, characteristic ratio assignment methods are used to assign PID coefficients. Through experiments, it is shown that attitude of the vehicle successfully follows the step command.
서영수,김종균 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
In this paper, the speed control of induction motor was researched by presenting indirect vector control algorithm to improve the dynamic performance of induction motor, resulting in quick response characteristics such as DC motor. Speed detecting method was used by M/T method and made the simple speed calculation of the algorithm using the HSI.0 pin and HSI_TIME of 80C196KC. It was used each PI controller for current controller and speed controller of control algorithm, 80C196KC to CPU for fast velocity processing computation in designing the current harmonics of voltage sourace inverter. We would like to confirm through experiment the relatively fast response velocity with variable command-speed, applying proposed system to 5[HP] 3φ induction motor.