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적응 관측기를 이용한 영구자석 동기전동기의 센서리스 제어
홍찬호(Chan-Ho Hong),윤명중(Myung-Joong Youn) 전력전자학회 1997 전력전자학술대회 논문집 Vol.1997 No.-
A new approach to the position sensor elimination of PM synchronous motor drives is presented in this study. Using the position sensing characteristics of PMSM itself, the actual rotor position as well as the machine speed can be estimated by adaptive flux observer and used as the feedback signal for the vector controlled PMSM drive. The adaptive speed estimation is achieved by model reference adaptive technique. The adaptive laws are derived by the Popov's hyperstability theory and the positivity concept. In order to verify the effectiveness of the proposed scheme, computer Simulations are carried out for the actual parameters of a PM synchronous motor and the results well demonstrate that the proposed scheme provides a good estimation value of the rotor speed without mechanical sensor It is also shown that the actual rotor position as well as the machine speed can be achieved under the variation of the magnet flux linkage<br/> Since the flux linkages are estimated by the adaptive flux observer and used for the identification of the rotor speed, robust estimation of the rotor speed can be performed
Steering Wheel의 Dynamic Damper 고유진동특성 조절 연구
박동진(Dong Jin Park),범형택(Hyung Taek Bum),홍찬호(Chan Ho Hong) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Steering wheel basically takes charge of steering mechanism function of cars. Furthermore, it is the most connected interface with drivers not only to reduce the impact of crash by airbag but also to control many convenient gadgets such as audio, cruise and bluetooth. The vibration directly-sensed by drivers through a steering wheel is the major factor to degrade the quality of inner space of a car: this vibration can make drivers emetic or dizzy. Steering wheel should not only fulfill basic demands but guarantee the proper level of the frequency to avoid resonance phenomena, fatigue failure due to a specific frequency. To satisfy this, we can strengthen steering wheel itself or modulate the frequency with a special component, dynamic damper. Dynamic damper is the component of a car that diminishes the vibration generated during driving attached to the vibrating source or conveyer. In particular, dynamic damper is attached to column shaft which is directly connected to steering wheel to damp the vibration transmuted to the wheel. For some sort of cars, in order to improve the efficiency of steering wheel or column shaft, steering wheel is equipped with dynamic damper inside so that it can reduce the microvibration transmitted via column shaft and provide more comfortable environment to drivers. In this study, we introduced the basic principles and properties of dynamic damper to steering wheel, understand the factors which control the proper frequency, and proposed the designing of more effective steering wheel which overcome the limit of inner space. For this purpose, we simplified the previous model of dynamic damper using CATIA V5 and analyzing Mode with Nastran FX. We used physical properties of present model of dynamic damper for all model. Mass and rubber is the major decisive component to the frequency of dynamic damper. By varying the outward shape of mass and the contact point of rubber and mass, we checked the consequential change of the frequency of dynamic damper and provided the proper direction and range of it. If we can control the frequency of dynamic damper by the length of rubber, we will expect the more improved Steering Wheel for overcoming the limit of inner space.