• Journal of Electrical Engineering and Technology
• /
• 제9권3호
• /
• pp.866-872
• /
• 2014

The purpose of this paper was to find an effective method for measuring electromagnetic torque produced by a brushless DC motor with single-phase current sensing in real-time. A torque equation is derived from the theory of brushless DC motor. This equation is then validated experimentally with a motor dynamometer. A computer algorithm is also proposed to implement the electromagnetic torque estimation equation in real-time. Electromagnetic torque is a linear function of phase current. Estimating the electromagnetic torque in real-time using single-phase current is not appropriate with existing equations, however, because of the rectangular alternating-pulse nature of the excitation current. With some mathematical manipulation to the existing equations, the equation derived in this paper overcame this limitation. The equation developed is simple and so it is computationally efficient, and it takes only motor torque constant and single-phase current to evaluate the electromagnetic torque; no other parameters such as winding resistances, inductances are needed. The equation derived is limited to the three-phase brushless DC motor. It can, however, easily be extended to the multiphase brushless DC motor with the technique described in this paper.

• 조명전기설비학회논문지
• /
• 제24권1호
• /
• pp.145-151
• /
• 2010

영구자석의 반발력을 이용한 반송장치에서 캐리어를 받아 다음 스테이션으로 방향을 전환해주기 위한 회전판의 제어를 수행하기 위한 제어기로서 적당한 모터의 선정을 위하여 두 가지 형태의 제어기를 만들고 이를 비교하여 최적의 제어기를 선정하고자 하였다. 즉 스텝모터를 사용한 마이크로스텝방식의 오픈루프 제어와 DC모터를 사용한 폐루프 제어방식의 DC서보 방향제어기를 설계하고 제작하였다. 이 두 방식의 방향제어기의 성능과 제어특성을 비교하였다.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제3B권1호
• /
• pp.59-64
• /
• 2003

This paper presents a new rotor position estimation method for brushless DC motors. The estimation error of the rotor position clearly provokes the phase shift angle misaligned between the phase current and the back-EMF waveforms, which causes torque ripple in brushless DC motor drives. Such an estimation error can be reduced with the help of the proposed neutral-voltage-based estimation method, which is structured as a closed loop observer. A neutral voltage appearing during the normal mode of the inverter operation is found to be an observable and control table measure, which can be used for estimating an exact rotor position. This neutral voltage is obtained from the DC-link current, the switching logic, and the motor speed values. The proposed algorithm, which can be easily implemented by using a single DC-link current and the motor terminal voltage sensors, is verified by simulation and experiment results.

• 한국공작기계학회:학술대회논문집
• /
• 한국공작기계학회 2003년도 춘계학술대회 논문집
• /
• pp.299-304
• /
• 2003

This paper proposes an algorithm to estimate the screw torque from parameters of induction motor and current of DC motor without strain gage and torque cell. The parameters of friction torque search for damping ratio and electromotive force constant use the motor torque and angula speed signals be generated in the induction motor, make use of oscilloscope and stroboscope for precise measured of experimental data, measured physical parameters through experimental. In addition the screw torque estimated use of measured current signals from induction moor. The results, theory and simulation recognized well coincidence.

• 한국소음진동공학회논문집
• /
• 제13권7호
• /
• pp.532-538
• /
• 2003

This paper studies on the noise reduction for a small automobile DC Motor (a window motor) using the 6 sigma process. The application of 6 sigma process suggested reliable and valuable statistical data for the quality of the DC motor at the production line. In the measurement step in 6 sigma process. the FMEA(failure mode effect analysis) were used for the detection of noise sources. The application of 6 sigma Process gave not only the improving method for the quality of the DC motor but also the confidence of improvement Itself since it was done on the basis of the test results for a number of DC motors at the production line. Consequently the 6 sigma process was proved very effective for the noise reduction at the production line.

• 대한전기학회논문지:시스템및제어부문D
• /
• 제53권5호
• /
• pp.338-344
• /
• 2004

This paper presents a sensorless speed control of a DC servo motor using a fuzzy-sliding observer in the presences of load disturbances. A fuzzy-sliding observer is proposed in order to estimate the speed of a motor rotor. First, a sliding observer is used to estimate the derivative of the armature current directly using the armature current mesured in the DC servo motor. Second, the optimal gain of the Luenberger observer is set up using the fuzzy control. Experimental results show the good performance in the DC servo motor system with the proposed fuzzy-sliding observer.

• 한국산학기술학회논문지
• /
• 제7권2호
• /
• pp.107-112
• /
• 2006

본 연구에서는 설계단계에서 소형 직류 모터의 동특성을 파악할 수 있는 유한요소 해석모델을 개발하였다. 유한요소해석 결과의 검증을 위하여 충격실험을 실시하였으며 모터의 고유진동수와 모드형상을 추출하여 비교하였다. 개발된 유한요소 해석모델을 이용하여 모터의 형상변화가 동특성에 미치는 영향을 분석할 수 있었으며 이는 향후 고품위 저진동 직류모터를 개발하는 데 효과적으로 이용될 수 있다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
• /
• pp.971-974
• /
• 2003

본 논문은 DC Motor의 속도 제어를 위해서는 속도를 결정해주는 PWM 출력과 Motor의 속도를 측정할 수 있는 고속카운터가 필요하며 설정한 값과 실제 출력되는 값을 동일하게 만들어주는 제어부분을 구현하여야 하며 시스템을 구성하기 위한 주변 I/O도 구성되어야 한다. 기존 마이크로프로세서로 구현을 하게 되면 PWM 출력과 제어 알고리즘에 대한 연산 및 주변 I/O에 대한 구현이 용이하겠지만 DC Motor의 Encoder에서 나오는 신호를 카운터하기에는 부족한 측면이 많으며 마이크로프로세서의 연산처리 과정에 따라 제어 알고리즘 연산에 소비되는 시간도 FPGA로 구현한 시스템보단 상대적으로 여유가 없다. 본 논문에서는 FPGA만을 이용하여 PWM, HSC, PID, 주변 I/O등을 하나의 Chip에 System On Chip화함으로 실제 시스템에 적용할 때 제어시스템의 소형화와 제어대상을 고속의 정확성있는 제어시스템을 연구 하였다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
• /
• pp.856-859
• /
• 1997

In this paper we treat the application of fault detection method in DC motor having both model mismatch and noise problems. A fault detection method presented by Kwon et al. (1994) for SISO systems has been here experimented. The model mismatch includes here linearization error as well as undermodelling. Comparisons are made with the real plant, DC motor. The experimental result of robust fault detection method is shown to have good performance via with the alternative fault detection method which do not account noise.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
• /
• pp.684-686
• /
• 2004

This paper is concerned with the DC motor speed control using distributed control system. We design CAN nodes which can transmit control and monitoring data through CAN bus and apply these to distributed networked control system. The results of the experiment validate effectiveness of our distributed networked control system.