초록 ▼

지상에서 추진전력을 공급하므로 가공전차선 설비가 불필요해지고, 그에 따라 기존 철도시스템보다 건설비 저감, 유지보수비 저감이 가능한 LPM 추진시스템은 그 구조적인 특징에 의해 가감속 성능 우수, 비점착 구동에 의한 등판능력 우수, 차량 경량화에 따른 높은 에너지 효율 등 많은 장점을 갖는다. 본 보고서에서는 철도차량용 LPM 추진시스템의 원천기술 개발을 위한 기초기술을 확보하고, Test-Bed를 통해 실증하는 기술 개발을 진행하였다. 철도차량용 LPM 추진시스템 원천기술 개발을 위해 5개의 세부 연구 테마를 도출하여 진행하였고,

지상에서 추진전력을 공급하므로 가공전차선 설비가 불필요해지고, 그에 따라 기존 철도시스템보다 건설비 저감, 유지보수비 저감이 가능한 LPM 추진시스템은 그 구조적인 특징에 의해 가감속 성능 우수, 비점착 구동에 의한 등판능력 우수, 차량 경량화에 따른 높은 에너지 효율 등 많은 장점을 갖는다. 본 보고서에서는 철도차량용 LPM 추진시스템의 원천기술 개발을 위한 기초기술을 확보하고, Test-Bed를 통해 실증하는 기술 개발을 진행하였다. 철도차량용 LPM 추진시스템 원천기술 개발을 위해 5개의 세부 연구 테마를 도출하여 진행하였고, 축소모형/실모형 Test-Bed를 구축하여 제안 기술을 검증/평가하였다. 원천기술 개발과 함께 기술 실용화를 위한 초석으로 LPM 추진시스템의 BOM 체계 구축 및 유지보수 방안을 마련하여 실용화 가능성을 검토하였다. 5개의 세부 연구 목표는 다음과 같다.
○ 철도차량용 LPM 추진시스템 기초기술 확보
○ 축소형 LPM 추진시스템
○ 실모형 LPM 추진시스템
○ LPM BOM 시스템 구축
○ LPM 추진시스템 실용화 검토

Abstract ▼

III. Scope of the project and deliverable
(1) Fundamental technology for railway LPM traction system
○ Evaluation of the applicability of LPM traction system to railway
- A review of the government's new growth engine and green growth policy, railway policy and regulation was carried out to

III. Scope of the project and deliverable
(1) Fundamental technology for railway LPM traction system
○ Evaluation of the applicability of LPM traction system to railway
- A review of the government's new growth engine and green growth policy, railway policy and regulation was carried out to analyze the political, technical and economical feasibility of developing an LPM traction system.
- Compared with other linear motors and the existing railway traction system, the system appeared to be superior in terms of system installation and cost efficiency, including the characteristics of lightweight, simplified control and compatibility with other train control system; in particular, the maintenance cost could be reduced to 23% that of other systems.
○ Study on LPM fundamental technology for traction
- The driving principle of the LPM traction system originated from BLDC motor's driving system and LPM traction system modeling was implemented based on this principle.
- Stator voltage system could be inducted as a 2-pole rotary machine and torque equation was sought, accordingly, and conversion equation for conversion between rotary device and linear device was induced.
- Back electromotive force of LPM traction system is generated in a trapezoidal profile due to structural characteristics, and thus a square wave current control system is favorable in terms of torque ripple reduction.
- Current controller was designed and simulation model was developed to identify the characteristics based on LPM traction system modeling.
- Through a simulation using a full-scale design parameter, traction force when supplying 1,000A to ground coil was estimated at 5kN.
(2) A down-scale LPM traction system
○ Development of down-scale LPM traction system
- Design and fabrication were implemented after determining the specification of LPM traction system including inverter, COU board and gate board.
- Bogie location information is needed for current control, and hole sensor for sensing the position and permanent magnet on bogie were used.
○ Study on down-scale model analysis
- Predicting the performance of a down-scale model with 2D and 3F finite element analysis model using the parameter of a down-scale model.
- Verifying the accuracy of analysis model after comparing and confirming simulation of back electromotive force and measured data are similar.
- As a result of predicting the traction power after energizing 200A current, 2D model analysis indicated 4.65N and 3D indicated 5.05N; according to actual test, 3.9N was obtained.
- The difference between the analysis result and actual test was attributable to the difference in current to ground coil, and should the same current be applied, the result is expected to be similar.
○ Analysis of LPM traction system and study on torque ripple reduction
- LPM traction system uses a ground coil winding method, and thus the back electromotive force of phase A and phase B appears to not be the same.
- There are different maximum values of magnetic flux interlinkage to each phase winding due to variation in pore size.
- Thus, as much torque ripple as the difference in back electromotive force is generated when applying the same current to phase A and phase B.
- To reduce the torque ripple, the current difference according to the different back electromotive force shall be applied to each phase, and a current control technique to minimize torque ripple is proposed.
- Simulation and test were conducted to validate the proposal and deviation in torque ripple before and after applying compensation method was reduced by 29% to 48% from 77%.
(3) A full-scale LPM traction system
○ Design and fabrication of a full-scale LPM traction system
- Design and fabrication of ground LPM traction system
▷ A ground coil generates the power by responding to the magnetic field of the mover while conducting.
▷ This is designed as a 2-phase and 2-row structure, and maximum conduction current is 2,000A.
- Design and fabrication of onboard electromagnet
▷ Magnetic field is generated by DC to the on-board electromagnet, which interacts with the ground coil to generate the power (8-pole)
- Design and fabrication of current feeder and collector system
▷ Inductive power collection and battery are applied to feed the vehicle
▷ Inductive power collection uses the back electromotive force induced in the DC magnetic field generated by ground coil along the vehicle running direction.
▷ Battery, charger, and power converter to supply a constant current were fabricated to supply the power to electronic appliances and electromagnets.
- Design & fabrication of power converter module for supplying ground high current
▷ This consists of 6 components, including converter, inverter, cooler, positioning sensor, brake system and display.
▷ Display shows the user the information from the components and controls the LPM traction system according to the input by the user, helping the user to operate the bogie more conveniently.
- Fabrication of bogie and system integration
▷ A bogie is designed to fix the onboard equipment to the LPM traction system, which includes a permanent magnet, onboard electromagnet, battery, power converter and brake system.
▷ Unlike other bogies for ordinary railway vehicles, an axle-less system that uses one axle per wheel was adopted in order to enhance the performance and reduce the noise on curve.
○ A full-scale LPM traction system analysis model
- Predicting the performance of a full-scale model with 2D and 3F finite element analysis model using the parameters of a full-scale model.
- When applying 2,000A to the analysis model, 2D and 3D traction power was 3.6kN with a relatively larger ripple of 60%. Though a large ripple may have an effect on ride quality because of the significant vibration, the passenger would be affected insignificantly because of the larger inertial force.
(4) Development of LPM BOM system
○ Development of LPM BOM system (proposal)
- This can be classified into the onboard system and the ground system
- Onboard system comprises bogie, electromagnetic power supply, inductive power collector, brake control system and GPS
- Ground system comprises ground coil, vehicle location detector, inverter, converter and monitoring system.
- BOM system components comprise a BOM tree including Level 0 ~ Level 7, and data information includes BOM part name, part number, part version, unit price, original name, part register number, part material, manufacturer's code number, O&M manual, original quantity, location, serial number, procurement cost & date, service life and other information and document information.
- System is also designed to accommodate failure logging, which includes failure date, place, failure mode, failure characteristic, cause and corrective measures.
○ Maintenance system (proposed)
- The maintenance system of the LPM traction system was developed based on a system used by Seoul Metropolitan Rapid Transit.
- The LPM traction system, unlike existing systems, is equipped with the stator of traction motor and inverter installed on ground, instead of onboard, and thus light maintenance is categorized into onboard and ground system separately.
- In addition, a detailed inspection standard for regular inspections by item was developed.
- A standard work procedure for repair and heavy maintenance was developed, as well as an O&M manual for components.
(5) Review of commercializing LPM traction system
○ Development of integrated railway Test-Bed (proposal)
- Substation of integrated railway test bed for LPM traction system that could accommodate performance evaluation by part and by structure, and a system to enable easy power supply to converter and slope starting test were proposed.
- Interference between ground coil, rail fastener and sleeper of ballast track and concrete track was reviewed.
- While ballast track could be installed without an adjustment of shape, concrete track requires an adjustment of the shape.
- Through a review of the layout of ground coil anchor and PS steel wire, no conflict with PC sleeper for ballast track was confirmed, but a construction error may occur because of a shortage of clearance.
○ Power supply to LPM traction system
- 22.9kV AC would be favorable for ground power converter of LPM traction system when considering line loss.
- As power converter requires 440V, transformer shall be provided and transformer capacity was determined considering pilot product specification.
- Thickness and type of cable also were determined considering pilot product specifications, and cable will be laid using existing common duct along the track from substation.

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 보고서 요약서 ... 3
• 요 약 문 ... 4
• SUMMARY ... 12
• CONTENTS ... 20
• 목차 ... 22
• 표목차 ... 24
• 그림목차 ... 26
• 1. 연구개발과제 개요 ... 34
• 1.1. 연구의 목적 및 필요성 ... 34
• 1.1.1. 연구의 배경 및 목적 ... 34
• 1.1.2. 연구개발의 중요성 ... 36
• 1.2. 연구 목표 및 주요 연구 내용 ... 37
• 1.2.1. 연구개발의 최종 목표 ... 37
• 1.2.2. 세부 연구 목표 및 내용 ... 37
• 1.3. 국내외 기술개발 현황 ... 40
• 1.3.1. 국내 기술 및 산업 동향 ... 40
• 1.3.2. 국외 기술 및 산업 동향 ... 45
• 1.3.3. 특허 동향 ... 49
• 1.4. 기존 기술(연구)과의 차별성 ... 55
• 1.4.1. 선형 추진시스템 분류 ... 55
• 1.4.2. 선형 추진시스템별 특징 분석 ... 55
• 1.4.3. 기존 기술과의 차별성 및 우수성 종합 분석 ... 61
• 2. 최종 연구 성과 요약 및 활용방안 ... 64
• 2.1. 연구개발 핵심성과 요약 ... 64
• 2.1.1. 성과리스트 ... 64
• 2.1.2. 철도차량용 LPM 추진시스템 기초기술 ... 65
• 2.1.3. 축소형 LPM 추진시스템 ... 66
• 2.1.4. 실모형 LPM 추진시스템 ... 69
• 2.1.5. LPM BOM 시스템 구축 ... 73
• 2.1.6. LPM 추진시스템 실용화 검토 ... 75
• 2.2. 연구개발 최종목표 달성도 ... 78
• 2.3. 연구개발 효과 및 활용방안 ... 80
• 2.3.1. 연구개발 효과 ... 80
• 2.3.2. 연구성과 활용방안 ... 81
• 3. 연구개발 수행 상세 내용 및 결과 ... 84
• 3.1. 철도차량용 LPM 추진시스템 기초기술 ... 84
• 3.1.1. LPM 추진시스템의 철도적용 타당성 평가 ... 84
• 3.1.2. 철도차량 추진을 위한 LPM 기초기술 연구 ... 91
• 3.2. 축소형 LPM 추진시스템 ... 120
• 3.2.1. 축소형 LPM 추진시스템 개발 ... 120
• 3.2.2. 축소형 모델 해석 연구 ... 158
• 3.2.3. LPM 추진시스템 분석 및 토크 리플 저감 연구 ... 176
• 3.3. 실모형 LPM 추진시스템 ... 196
• 3.3.1. 실모형 LPM 추진시스템 설계 및 제작 ... 196
• 3.3.2. 실모형 LPM 추진시스템 해석 모델 구축 ... 314
• 3.3.3. 철도차량용 LPM 추진시스템 성능평가 ... 342
• 3.4. LPM BOM 시스템 구축 ... 350
• 3.4.1. LPM BOM 시스템 구축(안) ... 350
• 3.4.2. 유지보수 체계 구축 ... 356
• 3.5. LPM 추진시스템 실용화 검토 ... 382
• 3.5.1. 철도종합시험선로 Test-Bed 구축(안) ... 382
• 3.5.2. LPM 추진시스템 전원공급 방안 ... 407
• 3.6. 결과검토 및 향후 과제 ... 435
• 3.6.1. 연구개발의 결과검토 ... 435
• 3.6.2. 연구개발 효과 ... 439
• 3.6.3. 연구성과 활용방안 ... 439
• 3.6.4. 향후 과제 ... 440
• 참고문헌 ... 441
• 끝페이지 ... 445