• Title/Summary/Keyword: PM BLDC

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Reduction of Electromagnetic Torque Ripple in High-Speed, High-Load Brushless DC Motors used for Automobile Parts (자동차 부품용 고속, 고부하 BLDC 모터내의 전자기적 토크 맥동 저감)

  • 황상문
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.4
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    • pp.39-46
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    • 1998
  • For permanent magnet brushless DC motors used for high speed fuel pumps, torque ripple is an important origin of vibration, acoustic noise and speed fluctuation. In this paper, the output torque profile of a PM motor with one phase energized is decomposed into the commutation torque, the reluctance torque and the armature reaction torque according to their source origins. It verifies that the output torque profile is qualitatively equivalent to the BEMF profile for low reluctance motors. This paper discusses the effect of magnet pole shaping and magnet arc length on the output torque and torque ripple. A magnet edge shaping is proposed to design a trapezoidal BEMF motor without torque ripple, with minimal sacrifice of the maximum output torque.

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A Study on the Development of High-Speed Control Algorithm for the trapezoidal Brushless DC Motor (구형파 브러시리스 직류 전동기의 고속 운전 제어 알고리즘 개발에 관한 연구)

  • Choi Jae-Hyuk;Jang Hoon;Kim Jong-Sun;Yoo Ji-Yoon;Song Myung-Hyun;Lee Young-Sun
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.435-438
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    • 2002
  • The Objects of this paper are developing and also improving a high-speed driving system of bushless DC motor(BLDCM) with economical and practical performance. Because BLDC motors are manufactured that each motor can create proper torque for their individual purpose, it is difficult to increase over the rated speed when a motor speed (with it's rated road) is reaching to a maximum speed so the motor torque cannot be increased. This paper verifies the effects of Leading Angle Algorithm, that is proposed on this paper, with examining existing methods to maximize the torque of a motor in high-speed driving area. The arithmetic processor for this experiment is TMS320C240 DSP controller that is designed for a special purpose of motor control in Texis Instrument Inc., and the used Inverter is PM10CSJ060, a Intelligent Power Module of Mitsubishi Corporation.

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Rotordynamic Design and Analysis of the Rotor-Bearing System of a 500Wh Flywheel Energy Storage Device (플라이휠 에너지 저장장치 회전체계의 동역학적 설계 및 해석)

  • 최상규;김영철;경진호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1997.04a
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    • pp.283-289
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    • 1997
  • A 500Wh class high-speed Flywheel Energy Storage System (FESS) driven by a built-in BLDC motor/generator has been designed, which runs from 30000 to 60000rpm nominally. Due to the motor/generator inside, the flywheel rotor made of composites supported by PM/EM hybrid bearing system has a shape of bell or pendulum and thus requires accurate rotordynamic analyses and prediction of its dynamic behavior to secure the operating reliability. Rotordaynamic analyses of the flywheel rotor-bearing system revealed that the bell shaped rotor has two conical rigid-body modes in the system operating range and the first conical mode, of which nodal point lies in the radial EM bearing position, can adversely affect the dynamic response of the rotor at the corresponding critical speed. To eliminate the possibility of wild behavior of the rotor, two guide bearings are adopted at the upper end of the rotor and motor/generator. It was also revealed that the EM bearing stiffness of 0.5~1.0E+6 N/m and damping of 2000 Ns/m are favorable for smooth operation of the system around the 2nd critical speed.

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