Journal of the Korea Institute of Military Science and Technology (한국군사과학기술학회지)

The Korea Institute of Military Science and Technology (한국군사과학기술학회)
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A Digital Current Control using Single DC-Link Current Sensing of BLDC Actuation Systems

단일 DC-Link 전류 계측만을 이용한 BLDC 구동시스템의 디지털 전류 제어

  • Hahn, Bongsu (Department of Robotics Engineering, Kyungil University)
  • 한봉수 (경일대학교 로봇공학과)
  • Received : 2018.07.31
  • Accepted : 2018.12.21
  • Published : 2019.02.05
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Abstract

In this paper, we propose a digital DC-Link current control approach for BLDC actuation systems. The proposed approach consists of the following two components: first, DC-Link current measurement with sampling instances synchronized with PWM frequency, and second, current control using single DC-Link current rather than three phases current of a motor. The proposed method proved its performance through experiments and simulation. The results showed that the control performance are increased compared with the BLDC actuation system which does not use current control.

Keywords

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Fig. 1. Conventional current controller(Ts1: Sample time, n = 0, 1, 2, ⋯ : the number of sample)

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Fig. 2. Proposed DC-Link current controller(Ts2: the second sample time for DC-Link current)

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Fig. 3. Proposed measurement of DC-Link current

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Fig. 4. Configuration of proposed current control using DC-Link current

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Fig. 5. H/W for proposed DC-Link current controller

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Fig. 6. Dead zone: (upper) ± 3e-3 sine command,(lower) ±1e-2 sine command

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Fig. 7. Steady state error

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Fig. 8. Angular velocity

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Fig. 9. Frequency response test

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Fig. 10. Results of current control using 150 load

Table 1. 6-step Commutation logic for BLDC motors

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Table 2. Normalized system parameters

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Table 3. Normalized gains of position and velocity controllers

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Table 4. Experimental results(Normalized)

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References

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