• Journal of Power Electronics
• /
• 제10권6호
• /
• pp.702-708
• /
• 2010

In this paper, a fault diagnosis algorithm for brushless DC (BLDC) motor drives is proposed to maintain control performance under switch open-damage. The proposed fault diagnosis algorithm consists of a simple algorithm using measured phase current information and it detects open-circuit faults based on the operating characteristic of BLDC motors. The proposed algorithm quickly recovers control performance due to its short detection time and its reconfiguration of the system topology. It can be embedded into existing BLDC drive software as a subroutine without additional sensors. The feasibility of the proposed fault diagnosis algorithm is proven by simulation and experimental results.

• Journal of Electrical Engineering and Technology
• /
• 제11권4호
• /
• pp.889-897
• /
• 2016

This paper presents an improved approach for compensating rotor position signal displacement in brushless DC (BLDC) motors with misaligned hall-effect sensors. Typically, the hall-effect sensors in BLDC motors are located in each phase and positioned exactly 120 electrical degrees apart. However, limitations in mechanical tolerances make it difficult to place hall-effect sensors at the correct location. In this paper, a position error compensator to counteract the hall-effect sensor positioning error is proposed. The proposed position error compensator uses least squares error analysis to adjust the relative position error and back-EMF information to reduce the absolute offset error. The effectiveness of the proposed approach is verified through several experiments.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
• /
• pp.1257-1260
• /
• 1996

This paper describes a fully digitalized driver for BLDC motors and the driver is realized by a single chip microprocessor. The speed change can be done by using the signal obtained from the position detecting sensor and adjusting the pulse width at the input channel of power module. In order to verify the effectiveness, an repetitive control method is adopted in the speed control tracking a periodic reference change in the BLDC motor system. The experimental results are shown for the reference tracking accurately according to the design parameter variation in the repetitive controller design.

• 전기전자학회논문지
• /
• 제23권1호
• /
• pp.310-313
• /
• 2019

This paper used the majority function to digitally filter back-electromotive force as an explanation of the Brushless DC MOTOR control algorithm. The cause and improvement of motor noise, which are operating in close proximity to high frequency sources, did not use conventional low pass filter and comparator elements. Also, they repeatedly output a noise-free BEMF signal for the input value of the majority detection filtering. These filtering steps can help reduce costs and minimize the area of a PCB by requiring relatively little hardware.

• Journal of Power Electronics
• /
• 제17권4호
• /
• pp.963-971
• /
• 2017

Torque ripple is one of the major sources inducing vibration and noise in brushless DC motors. This is especially true in applications such as the spindle motors used in hard disk drives. However, the relationship between torque ripple and acoustic noise/vibration is quite complicated. This paper presents a way to investigate this relationship with acoustic noise measurement and analysis. Results obtained with three different drive modes are used in the analysis. The results show that the acoustic noise analysis is very helpful in designing a high-performance drive strategy for BLDC motors.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
• /
• pp.736-739
• /
• 1997

In recent years, there has been a renewed interest in the BLDC motor as a research subject. In this paper we inspect sources of the torque ripple, which is one of the elements causing performance depreciation of BLDC motors. Based on the inspected sources of the torque ripple, feedforward compensation methods are proposed to reduce the size of torque ripple. The effectiveness of the proposed methods is verified with experiments.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 하계학술대회 논문집 B
• /
• pp.831-833
• /
• 2003

BLDC (Blush-Less Direct Current) motors are widely used for machine tools and ODD (Optic Disc Drive). Topology Optimization is applied to the rotor of a BLDC motor to improve in efficiency and save money. Density method and design sensitivity are derived. The result of topology optimization shows better performance.

• 전력전자학회논문지
• /
• 제12권4호
• /
• pp.277-284
• /
• 2007

본 논문은 전기추진시스템에 사용되는 BLDC 전동기 중에서 최대 토크 특성을 갖는 독립상 BLDC 전동기의 제어 특성에 대하여 기술하고자 한다. 독립 상 전동기는 각 상이 전기적으로 분리된 형태로 구성된 것이 특징이다. 이러한 특징을 분석하기 위하여 Y결선 3상 BLDC 전동기와 독립 3상 BLDC 전동기를 모델링하고, 시뮬레이션을 통하여 비교하였다. 시뮬레이션 결과 Y결선 3상 BLDC 전동기에 비하여 독립 3상 BLDC 전동기가 상전압이 높았다. 고정자 저항 및 인덕턴스가 일정할 때, 높은 상전압은 최대 상전류의 증가를 가져왔고, 이러한 전류 증가는 최대 토크를 증가시킨다. 그러므로 독립상 BLDC 전동기의 상전류를 제어함으로써 독립상 BLDC 전동기의 전류 맥동이 저감됨을 확인하였다.

• 전력전자학회논문지
• /
• 제21권2호
• /
• pp.134-143
• /
• 2016

This paper proposes a novel asymmetrical interior permanent magnet (IPM) brushless DC (BLDC) motor structure, which utilizes half-type permanent magnet (PM) configuration and has asymmetrical side gaps (slot next to the PMs) for reducing torque ripples. This structure uses 24% less volume of PMs than conventional IPM BLDC motor with a full set of magnets. The characteristics of the proposed motor are compared with three other half-type IPM BLDC motors through finite elements method (FEM) analysis, and the usefulness of the proposed motor was verified through experimental evaluation on prototypes of the conventional motor and proposed motor under various torque load conditions. This research obtained a high-performance IPM BLDC motor while decreasing manufacturing cost at the same time.

• 한국지능시스템학회논문지
• /
• 제18권3호
• /
• pp.367-372
• /
• 2008

본 연구는 BLDC 모터의 동일모델간 다른 정상범위로 인해 발생하는 상태판단 문제를 해결해 진단 효율을 높이는데 있다. 모터내 고유한 외란은 동일한 상태임에도 정상상태 범위가 다르게 계측되는 원인이다. 이러한 문제는 진단모델 설계시 모터 상태를 구별하기 위한 특징변수와 상태판단 기준값을 결정하기 어렵게 한다. 실험은 다수의 BLDC 모터들에서 신호를 계측하기 위한 시스템을 구성하고, 모터별 다른 정상범위를 관찰하고 고장들을 상태별로 분류하였다. 계측한 신호는 제안한 상태천이모델을 사용하여 모터 고유외란의 영향을 최소화하였다. 제안한 상태천이모델은 동일 모터모델에서 발생하는 다른 정상상태 특성을 줄여 고장 검출효율을 향상시키는 방법이다. 본 연구의 실험 결과, 고장 검출율이 향상되었으며 제안한 상태천이모델이 진단에서 유용한 방법임을 알 수 있었다.