• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.843-845
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• 2001

In this paper, we analyze the characteristics of electecromotive force(emf), phase current and torque according to the length of the air gap using 2nd order FEM(Finite Element Method) in Synchronous Reluctance Motor(SRH) and Brushless DC Motor(BLDC) with same volume and size. In the analysis with FEM, we applied the time-step function considering the motor switch in the magnetic vector potential of the unknown node.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.298-302
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• 1994

Brushless DC motors have a trapezoidal back EMF wave form and are fed with rectangular stator currents. Under these conditions, the torque produced is theoretcally constant. However, in practice, torque ripple may exist, one major cause of which conies from phase current commutation. In this paper we propose an improved method of reducing the torque ripple due to phase current commutation of indirectly restricting the uncommutated current through control of the other phase currents. Simulation results are present.

• 조명전기설비학회논문지
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• 제27권8호
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• pp.36-41
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• 2013

This paper is development of single-phase brushless DC motor with outer rotor for ventilation fan. Cogging torque causes the noise vibration to greatest impact on ventilation fan. Asymmetric notches are applied to tapered-teeth for cogging torque reduction of single-phase brushless DC motor. Initial model is notchless and proposed model is applied 2 asymmetric notches. The proposed method is proved motor characteristic through finite element analysis(FEA). Also, experimental results verify that the proposed model considerably reduces cogging torque and have the good sound quality in ventilation system.

• 전력전자학회논문지
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• 제8권4호
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• pp.336-343
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• 2003

일반적으로 브러시리스 직류 전동기의 운전을 위한 회전자의 위치정보와 여자시점 검출을 위해서는 홀센서나 엔코더와 같은 측정 장치가 요구된다. 본 논문에서는 부가적인 검출 장치를 사용하지 않고 각 상의 단자전압을 분석하여 여자 시점뿐만 아니라 회전자의 절대위치를 검출 할 수 있는 센서리스 운전 시스템을 제안한다. 더불어, 제안한 알고리즘을 10k[W]급 전동기에 적용하여 유효성과 타당성을 검증한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.409-413
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• 2001

This paper presents a comprehensive study result on reducing commutation torque ripples generated in brushless dc motor drives with only a single dc-link current sensor provided. In brushless dc motor drives with only a single current sensor, the commutation torque ripple suppression that is practically effective in low speed as well as high speed regions has not been reported. A proposed commutation compensation technique based on deadbeat dc-link current controller takes a closed loop control scheme and a parameter insensitive property. The proposed control method is verified through simulations and experiments.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.385-387
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• 1999

Brushless DC Motors are widely used because of their high power ratio and easy control. But the brushless DC Motors need rotor Position- and speed- sensor such as encoder, resolver and hall sensor. The position sensor has present several disadvantages from the standpoint of drive cost, machine size and reliability. Hall sensors are used generally because of low cost but their operating temperature is limited up to $75^{\circ}C$ because of sensitivity of temperature. Now a day many research projects are on the development of sensorless brushless DC motors to correct these disadvantages. In this paper, characteristics such as starting, change of speed and load of a sensorless brushless DC motor are investigated.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 A
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• pp.379-381
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• 1999

This paper presents a study of the performance of a brushless DC motor (BLDCM) speed control system. Recently, most motor controls are implemented in digital electronics. Digital controllers tend to be more accurate, less susceptible to noise and more flexible in terms of programming. The system used a digital PI controller in order to implement the constant speed of Brushless DC motor. Microprocessor used in this experiment is 80c196kc. The applied motor has been constructed using a 50W, 150V, 3000rpm, four-pole motor.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• 제4B권3호
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• pp.122-126
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• 2004

The objective of this paper is to provide a comparison between the Line Start Permanent Magnet, Skeleton type Brushless DC, and the Snail-cam type Switched Reluctance Motor. These motors are compared under the same load characteristic as the cooling fan motor of a refrigerator. The comparison consists of speed, output power, efficiency, copper loss, and cost for three different motors. For the given application, the results provide an indication of the best machine suited with respect to performance and cost.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 B
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• pp.1300-1302
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• 2005

Slotless brushless dc motor with 돗 characteristics of high speed and power density has been more widely used in industrial and factory machine. This paper deals with the dymanic simulation and test results of slotless type high-speed brushless DC(BLDC) motor. The mathmatical model of the BLDC motor is presented with the analytical solution of back EMF constant. And, the controller is implemented using a TMS320F2812 DSP-based system with power conversion circuit.

• 조명전기설비학회논문지
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• 제22권10호
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• pp.97-103
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• 2008

최근 가전제품에 브러시리스 직류 (Brushless DC) 전동기의 센서리스 드라이브를 적용시키는 사례가 증가하고 있다. 특히 사람들의 삶의 질이 향상 됨에 따라 가정에서 가장 밀접하게 연관되어 있는 냉장고, 에어컨과 같은 가전제품에 가청소음을 줄여 보다 편안하고 안락한 생활을 추구하고 있다. 본 논문에서는 브러시리스 직류전동기에 랜덤 PWM을 적용한 냉장고용 압축기의 저가형 센서리스 드라이브를 이용하여 기존 드라이브 보다 가격과 소음을 줄일 수 있음을 실험하였다. 이러한 실험으로 전자적 소음을 줄임으로써 소음에 질을 향상시킬 수 있음을 확인할 수 있었다.