• Journal of Advanced Navigation Technology
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• v.28 no.4
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• pp.379-385
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• 2024

INS(inertial navigation system) aligns itself using gravity and Earth's rotational rate from accelerometers and gyro sensors when stationary. Typically, ZUPT(zero velocity update), which is based on a linear error model Kalman filter, is used when it is stationary. However, such algorithms assume stationary conditions, leading to increased alignment errors or filter divergence during maritime mooring due to wave-induced motion. This paper designs a mooring alignment algorithm for maritime platforms using a Kalman filter, which uses large heading angle error model and an initial position correction technique. And it is validated by simulation. Furthermore, it is confirmed that applying this to a rotational INS dramatically improves performance through the principle of bias cancellation.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.1
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• pp.9-18
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• 2007

This paper proposes the modeling of sensorless drive system using 120 degree conduction method for IPM (Interior Permanent Magnet) BLDC motors and analyzes characteristics of the terminal voltage that is used to detect the rotor position. This paper shows that the ZCP (Zero-Crossing Point) of the measured terminal voltage used In sensorless control is ahead of that of the back EMF of IPM motors because they have a saliency. This research also analyzes that the amount of position detection error is related to saliency, rotor speed, and load condition. In addition, this paper shows that motors have bigger advance angles than we have expected because the ZCP of terminal voltage precedes the actual ZCP, and under operation conditions such as heavy load and high speed it may generate abnormal currents that flow toward opposite direction after phase current becomes zero.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.407-408
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• 2012

본 논문은 매입형 영구자석 동기 전동기의 감자 상황에서의 초기 위치 추정 방법을 제시한다. 신호 주입 센서리스 제어시, 영구자석의 극성을 추정하기 위해 영구자석의 자속에 의한 자기 포화 현상을 이용한다. 그러나 영구자석에 감자가 발생하였을 때는 극성에 따른 포화의 특성이 정상적인 경우와 달라져 전압을 주입했을 때 영구자석의 극성을 잘못 판단하게 될 수 있다. 본 논문에서는 감자 상황에서도 바른 극성 검출을 위해 d축 전류를 변경시켜가면서 전압을 주입하여 영구자석의 극성을 추정한다. 이를 통해 영구자석의 감자 상태를 파악하고, 감자 상황에서도 초기 위치 추정이 가능하게 된다. 정상적인 매입형 영구자석 동기전동기와 동일한 사양의 감자된 회전자를 가진 전동기에 제안된 초기 위치 추정 방법을 적용되어 그 타당성을 실험적으로 입증하였다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.198-199
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• 2011

본 논문에서는 매입형 영구자석 동기 전동기(IPM)의 회전자 초기각 및 전동기 제정수에 대한 정보가 전혀 없는 초기 상태에서 고주파 주입을 통한 제정수 추정기법을 제안한다. IPM 의 경우 정확한 제정수 추정을 위해서는 회전자의 초기각에 대한 정보를 필요로 한다. 고주파 신호 주입에 의한 주입 센서리스 제어 방법을 적용하여 초기 제정수 추정과 동시에 초기각에 대한 정보를 얻고, 이를 바탕으로 제정수를 보다 정밀하게 추정하게 된다. 제안된 방식은 모든 IPM 모터에 적용가능하며, 제정수와 더불어 초기각의 위치도 얻을 수 있어 전동기 제어의 초기 설정에 용이하다. 모의실험을 통하여 제안된 기법의 타당성을 검증하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.4
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• pp.311-318
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• 2004

Generally, PM BLDC drive system is necessary that the three Hall-ICs evenly be distributed around the stator circumference and encoder installed in case of the 3 phase motor. The Hall-ICs are set up in this motor to detect the main flux from the rotor. So the output signal from Hall-ICs is used to drive a power transistor to control the stator winding current. Instead of using three Hall-ICs and encoder, this paper uses only two Hall-ICs for the permanent magnet rotor position and for the speed feedback signals, and uses a micro controller of 16-bit type(80C196KC) with the 3 phase PM BLDC whose six stator and two rotor designed. Two Hall-IC Hc and $H_B$ are placed on the endplate at 120 degree phase difference. With these elements, we estimate information of the other phase in sequence through a rotating rotor.

• Journal of agriculture & life science
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• v.50 no.2
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• pp.187-194
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• 2016

The purpose of this study was to analyze temperature distribution characteristics using a model swine housing for temperature sensor adjustable positioning and developed a sensor and controller embedded exhaust fans utilizing ICT fusion technology for windowless swine housing. Temperature measured by the sensor attached on the exhaust fan was also determined that there is no problem, the temperature is located in the upper fan given the measured errors shown in the 1℃ temperature difference between the lower temperature than the other positions in the model swine housing. The performance of the exhaust fan at maximum output was found to be 1920rpm, air flow rate 125㎥/min. When the open area ratio of 70% one proper air volume of the exhaust fan was found to be 75㎥/min, 60pa. Maximum efficiency in all of the output of the exhaust fan is exhibited at about 70% open area ratio of the damper. The number of revolution of the exhaust fan was 1920rpm when the output was a maximum of 100%. AC output phase of the pulse duty ratio change of the controller was shown to change without delay. It was determined that the instant fan speed control is possible.

• Journal of Broadcast Engineering
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• v.23 no.5
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• pp.636-641
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• 2018

Recently, the digital signages display not only the rectangular shapes but also the various shapes and sizes. The high-resolution large-screen display monitors have evolved to multi-vision modes in which several screens are connected to one another. In this paper, we present the structure of an atypically shaped signage system in which the ROI changes with the rotation of the multiple displays. The inclination angle of the monitor is calculated by taking the output value of the gyro sensor inter-locked with the Arduino, and an image in which the position of the four corners is varied according to the rotation angle by using the polar coordinate system. In order to display images in the multi-screen environment, multiple displays with a gyro sensor were controlled using serial communication. As the result, we have obtained the flexibly moving monitor systems with associated images fitting in them.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.6
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• pp.449-455
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• 2007

Position information is very important when driving the Permanent Magnet Synchronous Motor(PMSM). Generally, resolver is used to obtain exact position information. However, it generates periodic position errors due to the transformer ratio difference and excitation signal distortion. When the vector control is done with the position information that includes position error, torque ripple is generated from time to time. This paper proposes the solution through analysis of above problem. Also, it's validity is verified by simulation and experiment.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.5
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• pp.336-343
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• 2008

This paper proposes a novel sensorless control scheme for a Permanent Magnet Synchronous Motor (PMSM) by using a parallel reduced-order Extended Kalman Filter. The proposed scheme can obtain rotor position and speed by back-EKF that is estimated by reduced-order ETD and save computation time great)y due to using a parallel structure that works by turns every sampling time. Therefore, proposed scheme has merits of conventional EKF, and problems of parameter sensitivity are partially overcome. And proposed scheme can safely estimate rotor speed and position by using new algorithms according to driving regions. Experimental results show the validity of the proposed estimation technique, and to verify the merit of the proposed scheme, a comparison of a new reduced-order EKF algorithm with a conventional EKF algorithm has been also made in terms of computation time.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.233-234
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• 2012

지구 화석연료의 고갈로 불안정한 고유가 시대를 살아가는 현대인들에게 자동차 연비는 소비자들이 자동차를 구매할 때 반드시 고려하고 있는 필수 조건이 되었다. 또한 자동차 연비향상 문제는 이산화탄소 배출로 인한 환경문제와도 직접적인 연관이 있다. 연료펌프는 연료탱크로부터 직접적인 펌핑을 통해 유체를 전달하는 장치이며 전동 모터에 의해 구동 된다. 본 논문에서는 연료펌프 전동 시스템인 모터와 제어기를 개발 하였다. 한편 모터를 제어하기 위해서는 회전자의 위치 검출이 필요한데 그 방법으로는 Hall 센서, 엔코더, 리졸버 등을 사용하게 된다. 하지만 연료펌프의 내부는 고온, 고압의 환경 조건이다. 이에 따라 센서리스 제어 방식을 선택 하였으며, 센서를 제거하여 비용절감이 되는 부분에서 본 논문의 주제와도 부합 된다.