Earticle

초록

영어

Recently, wound−rotor synchronous motors (WRSMs) employing no-insulation high-temperature superconducting (NI-HTS) field coils have attracted attention as a means of achieving high power density and high efficiency simultaneously in low-carbon propulsion systems for the marine and aviation sectors. In NI-HTS field coils, the turn-to-turn contact resistance distributes the field current into an azimuthal current and a leakage current, so the azimuthal current that actually generates the magnetomotive force cannot be determined from the terminal current alone. This paper proposes an armature-voltage-equation-based observer that estimates the azimuthal current using only stator-side voltage, current, and rotational speed, without a field terminal voltage measurement or a dedicated flux sensor. The observer separates the flux-linkage-rate and back-EMF components induced by the azimuthal current as unknown components, and computes the azimuthal current from the d− and q−axis compensator outputs. The estimation performance is analyzed in terms of observer convergence, armature–field mutual inductance error, and inverter dead−time voltage disturbance. The results show that the d−axis-output-based and q−axis-output-based methods exhibit complementary error characteristics, and that the q−axis-output-based method maintains the accuracy of the mean estimate even under dead−time voltage disturbance.

목차

Abstract
1. INTRODUCTION
2. PROPOSED AZIMUTHAL CURRENT ESTIMATION METHOD
2.1. d–q equivalent circuit model of an NI-HTS synchronous motor
2.2. Armature back-EMF-based azimuthal current estimation for NI-HTS field coils
3. COMPARATIVE ANALYSIS OF THE AZIMUTHAL CURRENT ESTIMATION METHOD
3.1. Verification of observer-based back-EMF and fluxlinkage-rate estimation
3.2. Azimuthal current estimation characteristics under armature–field mutual inductance error
3.3. Azimuthal current estimation characteristics under inverter dead−time voltage disturbance
4. DISCUSSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Hoon Jung [ Faculty of Applied Energy System Electrical Engineering, Jeju National University, Jeju, South Korea ]
• Sung Hoon Lee [ Electric Energy Research Center, Jeju National University, Jeju, South Korea ]
• Huu Luong Quach [ Faculty of Electrical Engineering, Can Tho University, Can Tho, Viet Nam ]
• Ho Min Kim [ Faculty of Applied Energy System Electrical Engineering, Jeju National University, Jeju, South Korea ] Corresponding Author
• Ji Hyung Kim [ Electric Energy Research Center, Jeju National University, Jeju, South Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537