Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Real time phase current estimation for brushless DC motor drive system by using front current of dc-link capacitor

직류단 캐패시터 전단 전류를 이용한 상 전류 추정 알고리즘

  • Lee, Won (Agency for Defencse Development) ;
  • Moon, Jong-Joo (Department of Electrical Engineering, Pusan National University) ;
  • Kim, Jang-Mok (Department of Electrical Engineering, Pusan National University)
  • Received : 2016.04.07
  • Accepted : 2016.08.01
  • Published : 2016.11.30
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Abstract

This paper proposes an estimation algorithm of phase currents of inverter systems with the planar bus bars for brush-less DC (BLDC) motors. The planar bus bar can improve the characteristic of the EMC(Electro-Magnetic Compatibility). In these inverters, a single current sensor of the dc-link measures the sum of a smooth capacitor current and phase currents of brush-less DC motor. Thus, it is essential to extract phase currents from the measured single current to control BLDC motor. Therefore, in this paper, the phase current is estimated by analyzing equivalent circuits of the BLDCM in ON and OFF periods of switching elements. The usefulness of the proposed algorithm is verified through experimental results.

본 논문은 플래너 버스바가 적용된 BLDC 전동기 드라이브 시스템에서, 직류단 캐패시터 전단 전류를 이용한 BLDC 전동기의 상전류 추정 알고리즘을 제안한다. 플래너 버스바는 기생 인덕턴스의 크기를 최소화하여 스위칭 시 스파크에 의한 소자 파손을 방지하고, EMC (ElectroMagnetic Compatibility) 특성을 향상시킨다. 하지만 플래너 버스바의 장점을 극대화하기 위해서는 직류단 캐패시터의 전단에 전류 센서를 설치할 수밖에 없는 구조적 제약이 따른다. 직류단 캐패시터 전단에 설치된 전류 센서는 캐패시터에 흐르는 전류와 인버터 입력전류의 합을 측정하게 된다. 따라서 직류단 캐패시터 전단 전류로부터 인버터의 입력전류를 정확하게 추출하는 것이 BLDC 전동기의 전류 제어를 위해서는 필수적이다. 본 논문에서는 BLDC 전동기의 온/오프 구간 동안의 등가 회로를 분석하여 캐패시터 전단 전류로부터 인버터 입력전류를 추정하는 알고리즘을 제안하였다. 제안된 알고리즘은 실험을 통해 그 타당성을 검증하였다.

Keywords

References

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