• Title/Summary/Keyword: BLDC motor

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Reducing Cogging Torque in Interior Permanent Magnet type BLDC motor by Flux barriers in the rotor (회전자부의 자속장벽 설치를 통한 IPM type BLDC 전동기 코깅 토오크 저감에 대한 연구)

  • Yun, Keun-Young;Yang, Byoung-Yull;Rhyu, Se-Hyun;Kwon, Byung-Il
    • Proceedings of the KIEE Conference
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    • 2004.10a
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    • pp.64-66
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    • 2004
  • Several techniques have been adopted in motor design of interior permanent magnet (IPM) type brushless DC (BLDC) motor to minimize cogging torque. IPM type motor has better ability in the centralization of flux than surface-mounted permanent magnet (SPM) type BLDC motor. So, the structure of IPM type BLDC motor has high saliency ratios that produce additional torque. However, this structure has a significant cogging torque that generates both vibration and noise. This paper describes new technique of the flux barriers design for reduction of cogging torque of IPM type BLDC motor. To reduce the cogging torque, flux barriers are applied in the rotor. Changing the number of barrier, the cogging torque is analyzed by finite clement method(FEM).

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The Heat Transfer Analysis of 1.2[kW] BLDC Motor on the Condition of the External Flow (외부 유동을 고려한 1.2[kW] BLDC 모터의 열 전달 해석)

  • Hwang, Ha-Young;Chung, Tai-Uk;Lee, Dong-Yeon;Hwang, Pyung;Shim, Jae-Sool
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.2
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    • pp.27-33
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    • 2012
  • In this paper, we researched the heat transfer analysis of 1.2[kW] BLDC motor on the condition of the external flow. The BLDC motor is fallen under influence of some heat generated by rotationg motor speed and it changes the life and confidence of motor. The heat makes to reduce the life of insulation and the magnetization. So motor can't make own performance. Therefore we calculated the losses about number of revolutions of motor. And then, we analyzed the heat transfer of BLDC motor by using the results when a fan attached to motor makes the external flow or not. The results showed that the temperature of motor increased constant values irrespective of external air temperature. The temperature of motor decreased very lower values than prior researches when the fan makes the external flow. In this method we can analyze the performance, losses and heat transfer of motor applied in the many industries.

A Study on a Control Method for Small BLDC Motor Sensorless Drive with the Single Phase BEMF and the Neutral Point (소형 BLDC 전동기 센서리스 드라이브의 단상 역기전력과 중성점을 이용한 제어기법 연구)

  • Jo, June-Woo;Hwang, Don-Ha;Hwang, Young-Gi;Jung, Tae-Uk
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.9
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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.

High Power Factor Control of High-speed Single-phase BLDC Motor (초고속 단상 BLDC 전동기의 고역률 전력 제어 방법)

  • Lee, Wook-Jin;Jung, Bumun
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.2
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    • pp.144-149
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    • 2016
  • This paper presents a power control method of high-speed single-phase BLDC motor. Most electric appliances require a power factor corrector (PFC) to mitigate grid current harmonics. However, the reactive components and power semiconductors in the PFC increase system cost and dimension. In this paper, a new motor drive system for a high-speed single-phase BLDC motor is proposed, which can decrease grid current harmonics without PFC by directly manipulating motor power and eliminating bulky electrolytic dc-link capacitor. Given that the proposed motor power control method does not require motor current controller, no current sensor is necessary. Moreover, the proposed algorithms can be easily implemented using a low-cost micro-controller. The effectiveness of the proposed power control method is verified by experiments.

Design and Analysis on Electromagnetic Vibration source of BLDC motor for Vibration r eduction (BLDC Motor의 전자기적 가진원 분석 및 진동저감 설계)

  • Song, Hyauk-Jin;Kang, Gyu-Hong
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1126-1128
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    • 2005
  • In this paper, electromagnetic vibration soruce of BLDC motor is analyzed, and a method of reducing vibration is presented. The vibration sources of BLDC motor are cogging torque and commutation torque ripple. The effectiveness of the proposed method were verified with experiments on FFT analysis.

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BLDC Motor Drive using C-dump Converter (C-dump 컨버터를 이용한 BLDC 전동기 구동)

  • Sungin Jeong
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.23 no.5
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    • pp.139-144
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    • 2023
  • In order to obtain the maximum characteristics of motors such as torque and efficiency, all motors basically use universal inverters designed for each motor's characteristics. However, if you look at the recent research results, you can see cases of SRM(Switched Reluctance Motor) driving studies using 6-switch inverters, which are BLDC(Brushless DC Motor) universal inverters, and research cases of driving 3-phase BLDC motors using 4-switch inverters. Therefore, it is possible to search for research methods by approaching various methods of driving and control that can drive each motor apart from the existing universal inverter. In line with this research trend, in this paper, a C-dump type converter, which is an SRM drive converter, was applied as a drive driver for a BLDC motor, and its characteristics and possibilities were studied.

A Study on Design and Manufacture of Slotless Outer Rotor BLDC Motor for a Vehicle Blower (자동차 송풍장치용 Slotless Outer Rotor BLDC 모터 설계 및 제작에 관한 연구)

  • Hyon-Jang Lee;Hee-Seok Jeong;Sun-Ho Cho
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.5
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    • pp.827-834
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    • 2023
  • In this paper, a slotless outer rotor BLDC motor for a vehicle blower was designed and manufactured to improve the disadvantages of general motors. The proposed motor solves the noise caused by mechanical friction of DC motor during rotation by removing the brush, Also, slotless air-gap windings are used to improve cogging torque by BLDC motor slots. Then, the motor has a structure in which a magnet is attached to the external rotor and rotates simultaneously with the internal rotor, there is no change in magnetic flux. Therefore, it has high efficiency by fundamentally reducing iron loss.

Driving System of 7-Phase BLDC Motor Speed Control by Fuzzy Controller (Fuzzy 제어기를 이용한 7상 BLDC 전동기 속도제어 구동시스템)

  • Yoon, Yong-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.11
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    • pp.1663-1668
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    • 2017
  • A BLDC motor with higher number of phases has several advantages, compared to the conventional three-phase BLDC motors. It can reduce the commutation torque ripple and the iron loss without increasing the voltage per phase and increase the reliability and power density. Higher number of phases increase the torque-per-ampere ratio for the same machine volume and output power by widening the electrical conduction period. In this paper, the proposed seven-phase BLDC motor drive system is made into several functional modular blocks, so that it can be easily extended to other ac motor applications: back-EMF block, hysteresis current control block, pwm inverter block, phase current block, and speed/torque control block. Also in a system of BLDC motor drive, the PI controller has been widely used in the speed controller because of the simple implementation. To obtain a good speed response in a general drive system using the PI controller, the high bandwidth of a controller is established. therefore, in this paper, a Fuzzy controller is applied to the 7-phase BLDC motor drive system in order to improve the speed control performance. The Fuzzy controller is compared with a conventional PI controller through the experiment with respect to speed dynamic responses. These experimental results show that the Fuzzy controller of the 7-phase BLDC motor drive system is superior over the conventional PI controller. The algorithm using the Fuzzy controller can improve a comfortable ride in the field of high performance 7-phase BLDC motor drive applications.

Magnetization Fault Diagnosis of Concentrated Winding BLDC Motors for Compressor (압축기용 집중권 BLDC 전동기의 착자 불량 진단)

  • Lee, Kwang-Woon
    • The Transactions of the Korean Institute of Power Electronics
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    • v.14 no.3
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    • pp.197-203
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    • 2009
  • This paper presents a novel method to diagnose magnetization faults produced during magnetization process using stator coils of a brushless dc motor with concentrated windings. It is demonstrated that the stator coil magnetization faults can cause a drop of energy efficiency of the brushless dc motor through computer simulations using a magnetization fault model and efficiency test using compressors. The proposed method diagnoses the stator coil magnetization faults by using an inverter during the brushless dc motor driving test after the magnetization process is completed. An experimental study on the brushless dc motor for compressor shows that the stator coil magnetization faults can be detected with high sensitivity.

Developing Unity BLDC motor controller adding TCP/IP for Vapor Recovery System (TCP/IP 기반 유증기 회수용 제어기 일체형 BLDC모터 개발)

  • Kim, Duck-young
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.3 no.4
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    • pp.3-9
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    • 2010
  • Recently, Applications of BLDC motor have grown gradually in energy savings and controls of speed and torque. But most of BLDC motors need controller and driving circuits aside from motor, according to various situations. In this paper, it was designed for a embedded controller and motor including microprocessor that programmable intelligent control as various circumstances. And in order that the user conveniently use better than to use web browser using TCP/IP module in controller.

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