• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.7
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• pp.1-8
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• 2018

This paper describes new communication methods for transmitting torque commands between the vehicle controller that determines the amount of power generation in a range-extended electric vehicle and the engine controller that performs it. Generally, vehicles use CAN communication, but in this case, the hardware and software of the existing engine controller must be modified. For this reason, it is not easy to apply CAN communication to small and medium sized automotive reorganize companies. Therefore, this research presents a pin-pin communication method for applying the existing mass produced engine controller to range-extended electric vehicles. The pin-pin communication method converts the driver's demand torque control map inside an mass produced engine controller into a virtual accelerator opening position according to the target speed and target torque of the engine, and converts this to a voltage signal for the existing mass produced engine controller to recognize it. The virtual accelerator opening positions are mounted in the form of a control map in the vehicle controller through the reverse conversion process in an offline environment and are determined by the engine generating power requirements and engine optimal operating point algorithm. These algorithms and signal conversion circuits for engine torque transmission have been mounted on the vehicle controller to conduct the virtual accelerator opening position conversion process according to the engine target torque and to establish the virtual accelerator voltage signal using the signal converter.

• Journal of Institute of Control, Robotics and Systems
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• v.4 no.1
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• pp.10-18
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• 1998

불확실한 변수와 비선형성을 가지는 유연조인트 로봇의 견실제어 방안을 제시한다. 그리고 본 시스템에서 불확실구조는 일치성을 유지하지 않는 불일치성 불확실 시스템이다. 제어기는 리아노프의 방안에 근거를 두고있다. 견실제어는 연산토크법을 사용하고 삽입제어기법을 통하여 좌표변환을 통해 구성된다. 제어기 설계과정은 우선 연산토크방법에 의해 시스템 동역학에서 정격부분을 선형으로 2개의 부분시스템으로 구성한다. 이후 좌표변환을 이용하여 각 부분시스템에 제어기를 구축한다. 이 방안을 통하여 관성 행렬이 알려진 값인 경우 이 행렬의 상위한계 조건없이 제어기를 설계할 수 있다. 따라서 임의의 형태의 로봇에도 적용 가능한 제어알고리즘이 된다. 설계된 견실제어는 변환된 시스템이나 원시스템 모두 실용적 안정성을 보장한다. 이 변환은 단지 불확실변수의 최대 한계값의 정보만을 요구한다.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.1-3
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• 2019

본 논문에서는 전차원 관측기를 이용한 유도기의 센서리스 운전에서 제정수 오차가 제어 성능에 미치는 영향을 수식적으로 분석하였다. 주파수 응답 함수를 이용해 실제 자속과 추정 자속의 관계를 운전 속도와 슬립 주파수의 함수로 나타내었다. 적응(adaptive) 법칙을 이용하여 추정 속도를 수식에서 제거하였다. 또한 각오차가 존재하는 상황에서 전류 운전점 변화를 고려하여 슬립 주파수를 토크 지령으로 변환하였다. 결과적으로 모든 운전 속도와 토크 지령에 대해서 임의의 제정수 오차가 시스템의 안정도, 속도 오차 및 토크 오차에 미치는 영향을 계산할 수 있는 수식을 구하였다. 기존의 분석 방법들이 많은 시뮬레이션과 실험을 통해 제정수의 영향을 평가했던 것과 달리, 구해진 수식에 근거하여 계산을 통해 빠르게 주어진 센서리스 운전 방법을 평가할 수 있는 방법을 제공하였다. 제안된 분석 방법은 시뮬레이션과 실험을 통해 검증되었다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.19 no.1
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• pp.66-70
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• 2013

The input current of three phase rectifier which is mainly used in the propulsion system of the electric propulsion ship includes a variety of low order harmonics. To reduce these harmonics, the power conversion system, used in the large vessels which high power is required, is currently used the rectifiers of 12-pulse output, but it still has a problem that occurs $12{\pm}1$ harmonics. Also, in the case of the direct torque control technique which is widely used for the speed and torque control, the torque ripple is severe and the input current of motor has greatly included harmonics by the switching of the inverter. In order to reduce harmonics and improve the performance of torque control, this paper presents that the auxiliary supply assisted into the 12-pulse rectifier of the electric propulsion system using direct torque control technique. We confirm the validity of the proposed method through the simulation under the environment of a real vessel system.

• The Transactions of the Korean Institute of Power Electronics
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• v.11 no.4
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• pp.349-360
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• 2006

Controller for doubly-fed induction-type wind generation system should be designed with mechanical power on blade. The controller in this paper consists of upper level controller and lower level controller. The upper level controller determines operating modes according to mechanical input power and calculates proper reference values. There are 4 operating modes - minimum speed control, variable torque control, torque limit control and idle mode. The lower level controller performs current regulated PWM control of rotor-side converter and grid-side inverter. A wind turbine simulator is implemented using doubly-fed induction-type generator and DSP based back-to-back converter to verify the performance of designed controller experimentally.

• Proceedings of the KIEE Conference
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• 2002.11c
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• pp.337-341
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• 2002

본 논문은 원자력 발전소의 안전에 있어 매우 큰 비중을 차지하는 모터 구동밸브(Motor-operated valve : MOV)의 성능진단에 직접 센서를 장착하지 않고 전기신호만을 이용하여 성능진단의 가능성을 보이기 위한 것이다. 모터 토크를 계산하기 위한 두 가지 방법으로서 D-Q frame 변환 방법과 Air-Gap 토크 식을 제시하였고, 계산된 두 토크 값은 정확하게 일치하였다. 부하를 변동하면서 토크미터로 측정된 토크 갑과는 1%의 오차범위 내에서 일치함을 확인했다. 따라서 두 토크 식은 모터구동 밸브의 성능진단을 위한 식으로 사용해도 좋다는 결론을 얻어낼 수 있었다. 계산된 토크를 주파수 분석함으로서 부하의 변동에 따라서 슬립 및 모터속도 주파수가 변화됨을 알 수 있었다. 즉 주파수 분석을 통해 MOV의 모터 및 구동기 부분의 성능 저하 감시에 유용한 단서를 제공해 줄 것이다. 결과적으로, MOV에서 전기신호의 분석은 시스템의 전기 및 기계적인 성능 저하 감시에 이용될 수 있을 것으로 기대된다.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.952-953
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• 2008

전기제동의 영역확대는 전동차의 성능향상을 위하여 연구가 지속되고 있으며 전기제동으로 전동차를 정차시키는 방법을 사용할때 공기제동은 정차 후 정지를 유지하는 정차브레이크의 기능만 필요하게 된다. 정지 후 전동기의 회전을 방지하여야 하므로 구배가 있는 곳에서 전기제동으로 정차시킬 때는 정차브레이크를 사용하기 이전까지 전력변환기는 정지 토크를 발생하는 기능을 갖고 있어야 한다. 본 연구에서는 정지 토크를 발생시키기 위하여 구배로 인한 부하 토크를 추정하여 전동차를 정차시키는 방법에 관한 것이다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.35-42
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• 2019

Nut fasteners that require ultra-precise control are required in the overall manufacturing industry including electronic products that are currently developing with the automobile industry. Important performance factors when tightening nuts include loosening due to insufficient fastening force, breakage due to excessive fastening, Tightening torque and angle are required to maintain and improve the assembling quality and ensure the life of the product. Nut fasteners, which are now marketed under the name Nut Runner, require high torque and precision torque control, precision angle control, and high speed operation for increased production, and are required for sophisticated torque control dedicated to high output BLDC motors and nut fasteners. It is demanded to develop a high-precision torque control driver and a high-speed, low-speed, high-response precision speed control system, but it does not satisfy the high precision, high torque and high speed operation characteristics required by customers. Therefore, in this paper, we propose a control technique of BLDC motor variable speed control and nut runner based on vector control and torque control based on coordinate transformation of d axis and q axis that can realize low vibration and low noise even at accurate tightening torque and high speed rotation. The performance results were analyzed to confirm that the proposed control satisfies the nut runner performance. In addition, it is confirmed that the pattern is programmed by One-Stage operation clamping method and it is tightened to the target torque exactly after 10,000 [rpm] high speed operation. The problem of tightening torque detection by torque ripple is also solved by using disturbance observer Respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2618-2624
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• 2009

Harmonics (or distortion in wave form) has always existed in electrical power systems. It is harmless as long as its level is not substantial. However, with the recent rapid advancement of power electronics technology, so-called nonlinear loads, such as variable frequency drives for motor power/speed control, are increasingly finding their way to shipboard or offshore applications. In this paper a new approach to direct torque control (DTC) of induction motor drive is presented. In comparison with the conventional DTC methods the inverter switching frequency is constant and is dramatically increased, requiring neither any increase of the sampling frequency, nor any high frequency dither signal. The well-developed space vector modulation technique is applied to inverter control in the proposed DTC-based induction motor drive system, thereby dramatically reducing the current harmonics. As compared to the existing DTC approach with constant inverter switching frequency, the presented new approach does not invoke any concept of deadbeat control, thereby dramatically reducing the computations.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.3
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• pp.66-74
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• 2005

This paper presents an implementation of digital servo speed control system of SPMSM(Surface-mounted Permanent Magnet Synchronous Motor) for industrial application with Direct Torque Control(DTC) using TMS320F2812 DSP. Although, the vector control scheme is adapted in many industrial servo system, but the DSP calculation ratio is increased by reference frame transformation and SVPWM of vector control. Therefore, this paper investigate the possibility of DTC scheme for industrial servo drive system instead of vector control scheme. DSP calculation ratio is compared between vector control and DTC algorithm in addition to the characteristic of speed control response. The suggested SPMSM control system shows the possibility of DTC scheme for industrial servo motor drive system instead of a vector control algorithm.