• 조명전기설비학회논문지
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• 제28권9호
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• pp.1-7
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• 2014

Brushless Direct Current(BLDC) Motor is essential to measure a rotor position because of that this motor type needs to synchronize the rotor's position and changeover phase current instead of a brush and commutator used on the existing dc motor. Recently, many researches have studied on sensorless control drive for BLDC motor. The conventional control methods are a compensation value dq, Kalman filter, Fuzzy logic, Neurons neural network, and the like. These methods has difficulties of detecting BEMF accurately at low speed because of low BEMF voltage and switching noise. And also, the operation is long and complex. So, it is required a high-performance microprocessor. Therefore, it is not suitable for a small BLDC motor sensorless drive. This paper presents control methods suitable for economic small BLDC motor sensorless drive which are an improved design of the BEMF detection circuit, simplifying a complex algorithm and computation time reduction. The improved motor sensorless drive is verified stability and validity through being designed, manufactured and analyzed.

• 전력전자학회논문지
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• 제27권1호
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• pp.33-39
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• 2022

A multi-phase brushless direct current (BLDC) motor is widely used in large-capacity electric propulsion systems such as submarines and electric ships. In particular, in the field of military submarines, the polyphaser motor must suppress torque ripple in various failure situations to reduce noise and ensure stable operation for a long time. In this paper, we propose a polyphaser current control method that can improve efficiency and reduce torque ripple by minimizing the increase in stator winding loss at maximum output torque by controlling the phase angle and amplitude of the steady-state current during open circuit failure of the stator winding. The proposed control method controls the magnitude and phase angle of the healthy phase current, excluding the faulty phase, to compensate for the torque ripple that occurs in the case of a phase open failure of the motor. The magnitude and phase angle of the controlled steady-state current are calculated for each phase so that copper loss increase is minimized. The proposed control method was verified using hardware-in-the-loop simulation (HILS) of a 12-phase BLDC motor. HILS verification confirmed that the increase in the loss of the stator winding and the magnitude of the torque ripple decreased compared with the open phase fault of the motor.

• 전기학회논문지P
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• 제50권3호
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• pp.109-116
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• 2001

In this paper, we adapted BLDC motor to PV water pumping systems to maintain high efficiency in the wide speed area. Also, to design confidence we adapted the vector control that drive the maximum torque at each speed limit. We designed optimal gain value of current, speed and pressure PI controller. Inverter gate pulse used Space Vector PWM to reduce torque pulsation of BLDC motor. According to, it was improve general matters of high water storage tank method by direct water supply pumping method.

• Journal of Power Electronics
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• 제18권4호
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• pp.1086-1098
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• 2018

This study presents a new sensorless commutation method for brushless direct current motors to replace Hall sensor signals with virtual Hall signals. The importance of the proposed method lies in the simultaneous elimination of the phase shifter and the low-pass filters, which makes the method simple and cost-effective. The method removes high ripple switching noises from motor terminals, thereby decreasing motor losses. The proposed method utilizes unfiltered line voltages with notches caused by current commutation. Hence, specific sign signals are defined to compensate for the effects of commutation noise. The proposed method is free from phase delay that originates from low-pass filters. The method directly produces virtual Hall signals, and thus, it can be interfaced with low-cost commercial commutation integrated circuits based on Hall sensors. Simulation and experimental results show the effectiveness and validity of the proposed method.

• 전기학회논문지
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• 제56권1호
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• pp.57-65
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• 2007

Along with the development of power electronics and magnetic materials, permanent magnet (PM) brushless direct current (BLDC) motors are now widely used in many fields of modern industry BLDC motors have many advantages such as high efficiency, large peak torque, easy control of speed, and reliable working characteristics. However, Compared with the other electric motors without a PM, BLDC motors with a PM have inherent cogging torque. It is often a principle source of vibration, noise and difficulty of control in BLDC motors. Cogging torque which is produced by the interaction of the rotor magnetic flux and angular variation in the stator magnetic reluctance can be reduced by sinusoidal air-gap flux density waveform due to reduction of variation of magnetic reluctance. Therefore, this paper will present a design method of magnetizing system for reduction of cogging torque and low manufacturing cost of BLDC motor with isotropic bonded neodynium-iron-boron (Nd-Fe-B) magnets in ring type by sinusoidal air-gap flux density distribution. An analytical technique of magnetization makes use of two-dimensional finite element method (2-D FEM) and Preisach model that expresses the hysteresis phenomenon of magnetic materials in order for accurate calculation. In addition, For optimum design of magnetizing fixture, Factorial design which is one of the design of experiments (DOE) is used.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1114-1116
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• 2000

A direct model reference adaptive control (DMRAC) is applied to the speed control of brushless do(BLDC) motor. The main objective is to achieve precise speed control in the face of varying motor parameters and load. The control is described as an outer loop speed control and an inner current loop control which has raster dynamics than the speed loop. The adaptive control is applied to the outer speed control loop. DMRAC is compared to an indirect adaptive controller(IMRAC) and a PI controller. Simulation results show that the two adaptive controllers give similar respose and are superior to the PI controller. However, the DMRAC algorithm is simpler to implement.

• Journal of Electrical Engineering and Technology
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• 제12권1호
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• pp.72-77
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• 2017

This paper proposes the explicit tuning rule of multi-loop PID controller for brushless direct current motors to predict the system behaviors in time and frequency domains, using properties of the convex combination method. The convex set of the proposed controllers formulates the envelope to satisfy the performances in time and frequency domains. The final control parameters are determined by solving the convex optimization problem subject to the constraints which are represented as convex set of time domain performances. The effectiveness of the proposed control method is shown in the numerical simulation, in which controller tuning algorithm and dynamics of brushless DC motor are well taken into account.

• 한국항공우주학회지
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• 제38권10호
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• pp.1026-1030
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• 2010

본 논문에서는 KSLV-II의 로켓엔진에 사용될 BLDC 모터로 구동되는 극저온 추력제어 밸브의 개발 과정 및 결과를 소개하였다. 개발된 추력제어밸브는 90K의 극저온, 113.2bar의 고압 환경에서 액체산소의 유량을 BLDC 모터로 작동되는 밸브 구동기를 통해 조절할 수 있다. 추력제어밸브는 모든 개발 인증시험을 통과하였으므로 향후 일부 하드웨어 수정 후, 엔진 연소시험에 적용이 가능하다.

• 한국정보통신학회논문지
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• 제15권5호
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• pp.1207-1212
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• 2011

본 논문은 BLDC 서보모터 펌프를 사용하는 PBW(power-by-wire) 시스템을 위한 DSP(Digital Signal Processor) 제어기에 대한 연구를 제시한다. PBW 유압 엑츄에이터는 BLDC 서보모터에 의해 구동되는 유압펌프와 유압 실린더 그리고 제어기로 구현된다. 이 PBW 시스템은 유압 실린더의 선형 추진 동작을 위해 서보 모터의 속도 제어를 필요로 한다. 본 논문에서는 벡터 제어 방법과 MIN-MAX PWM 기술을 활용하는 서보 제어기를 구현한다. 제어기로서, PWM 파형발생기, A/D변환기, SPI(직병렬인터페이스) 포트 그리고 많은 입/출력 포트 등을 가지고 있는 이유로 TMS320F2812 DSP가 채택되었다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.902-903
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• 2014

현재, 해양 레저 스포츠 산업이 발달로 인하여 해양 레저용 보트 산업도 발달해 나가고 있다. 그러나 세계적으로 친환경 기술 개발 관련 정책이 강화되고 있으며, 미국 및 유럽의 경우는 가솔린 엔진으로부터 배출되는 대기 오염 물질에 대한 환경규제를 점점 강화해 나가고 있다. 이러한 원인으로 인하여 친환경 배터리 충전식 전기모터시스템을 도입하고 있으며, 충전식 전기모터시스템에 사용되는 소형 모터 및 충전용 배터리에 대한 수요가 꾸준히 증가하고 있다. 본 논문에서는 배터리 충전식 전기모터시스템에 사용되는 직류 24[V] 환경에서 2.5[HP] 용량의 고출력 고효율의 선외기용 BLDC(Brushless Direct Current) 모터 제어기 및 모터 드라이브, 홀(Hall) 센서를 통한 BLDC 모터의 상태 파악 및 모터의 정/역 제어 및 속도제어에 대한 설계 방법을 제시하고자 한다.