초록 ▼

1. 기존의 spine을 중심으로 주변 부품이 붙어 이루어진 전동 풀 골프 카트 형태는 구조상 compact 한 접이식 구조로의 설계에 많은 제한 요소가 따르고 더욱이 접고 펴는데 필요 이상의 근력을 사용하여야 한다는 문제점이 확인 되었다.

2. 새로운 형태의 사면체의 프레임 구조를 갖고, transformer 와 같이 완전히 요철 형식으로 접을수 있는 구조를 개발하여 접은 후 체적 목표 달성과 더불어, 접고 펼치는 작업에 무리가 없음을 확인하였다.

3. 상품화된 모터 제어기/드라이버 선정에 많은 어려움을

1. 기존의 spine을 중심으로 주변 부품이 붙어 이루어진 전동 풀 골프 카트 형태는 구조상 compact 한 접이식 구조로의 설계에 많은 제한 요소가 따르고 더욱이 접고 펴는데 필요 이상의 근력을 사용하여야 한다는 문제점이 확인 되었다.

2. 새로운 형태의 사면체의 프레임 구조를 갖고, transformer 와 같이 완전히 요철 형식으로 접을수 있는 구조를 개발하여 접은 후 체적 목표 달성과 더불어, 접고 펼치는 작업에 무리가 없음을 확인하였다.

3. 상품화된 모터 제어기/드라이버 선정에 많은 어려움을 꺾었고, 네 번의 제어기/드라이버 변경이 과제 기간 연장을 요하는 주요 요인으로 작용하였다.

4. 네 차례의 field test를 시도하여, 최종적으로, 18 홀 주행을 완료하여 제시한 모든 성과지표/목표에 달성하였음을 확인하였다. 그러나 제시하였던 감속기형태의 인휠 모터는 운행 중 소음이 예상보다 높아, 후일 이 부분에 대한 설계 변경, 새로운 기어 소재 선정 또는 직 구동형 인휠모터를 사용하여 소음을 완전히 제거하여야 사업화가 가능할 것으로 보인다.

( 출처 : 요약서 )

Abstract ▼

In spite of the increased number of golf courses, expensive green fee in domestic golf courses is the prime factor to prevent the popularization of golf sports in Korea. An expensive green fee which includes $ 30 caddy fee per player is the main contributing factor not to bring enough golfers to the

In spite of the increased number of golf courses, expensive green fee in domestic golf courses is the prime factor to prevent the popularization of golf sports in Korea. An expensive green fee which includes $ 30 caddy fee per player is the main contributing factor not to bring enough golfers to the golf courses. Consequently, couple of dozens of country clubs annually are confronted with the financial difficulties and eventually ended up bankruptcy. With this situation, many county clubs are seriously considering the golf course operation without caddy or using caddy as an option by player. Up to date, over 20 country clubs in Korea have adapted caddy option or no caddy system with reasonably affordable green fee by providing the imported electric pull golf carts. This kind of caddy option system will contribute to make golf as a real walking sport and as a very popular one in Korea.

Although those imported electric pull golf carts will be rented in most country clubs adapting a caddy option system for a while, eventually the electric pull golf cart must be developed for the mountainside hilly environment such as most golf courses in Korea. Furthermore, likewise golfers in western country, the electric pull golf cart could be the belongings of each person instead of renting unit. It is because that player might not feel comfortable to use the different kind of rental unit of each country club. Consequently, many golfers might looking for more comfortable one such as remo-con type or full robot caddy style. To be a belongings, an electric pull golf carts must be designed to have a lighter weight to be easily manipulated by elder or smaller persons and to have a smaller folded size to allow car pull and to have a wider wheel base to avoid the accident in hilly county club.

In this project, new four face frame structure is developed instead of adapting conventional center spine shape. Consequently, folding and unfolding process gets easier and like a transformer type toy, this four face structure allows to have a very compact folded rectangular parallelepiped structure and it helps to use car trunk space efficiently which shall be required for car-pull situation.

Battery box which is located in front coner of four face have a strong structure to support golf bag as a tray and have enough space to adapt full size battery as well as master controller and receiver/transmitter. A 32 bit MCU is embedded in the master controller and a pair of Xbee modules are adapted for cross communication such as battery check from the remo-con panel and sending a control signal to the master controller. Both high performance modules will be the core for future advanced full robot caddy system which requires very complicated logical operation and frequent cross communication.

317 watt-h(max) li-polymer battery is installed for test purpose. Relatively smaller geared type in-wheel motors (50 watt X 2) were developed and adapted. Poly carbonate, aluminum and steel materials like a real product were selected for the mechanical parts of the 1^st prototype. Fully assembled total cart weight is 11.2 Kg and the fully fouled volume is 0.045 cubic meters which are slightly over the proposed target spec. 580 mm wheel base of new four face structure frame which is 20 % wider than the conventional structure could provide much safer guard when it is operated in the mountainside hilly county club.

Performing two times pre-test resulted the modification of few parts and software. Final two test performed at Adonis public CC with 6.4 Km and DaeDuk Science GC with 7.04 Km length including the hole to hole distance. Both golf courses are mild hilly courses relatively. Test results conforms that both 18 hole play with little over 10 kg bag requires only less than 110 watt-h battery in average. Also, it has been conformed that little over 50 meter long distance with 20 degree slope would not decelerate the speed of 3 Km/h. However, most of the performance test results reasonably satisfy the target specification, sound noise from the reduction gear was much higher then expected. This kind of problem has to be resolved before commercialization. Although replacing plastic gear could be the temporarily solution, adapting direct drive in-wheel motor could be the permanent solution.

( 출처 : SUMMARY )

목차 Contents

• 표지 ... 1제 출 문 ... 2보고서 요약서 ... 3요 약 문 ... 4S U M M A R Y ... 8CONTENTS ... 10목차 ... 11제1장 기술개발과제의 개요 ... 12제2장 국내외 기술개발 현황 ... 15제3장 기술개발 내용, 방법 및 결과 ... 17 1 절 기구부 개발 ... 17 2 절 전기부 개발 ... 22 1. 운행 방식 및 리모콘 패널 ... 23 2. 상위제어기 ... 24 3 절 기어드(geared) 모터 개발 ... 26제4장 목표달성도 및 관련분야에의 기여도 ... 29 1 절 - 목표 달성도 ... 29 1. 중량 및 제적 ... 29 2. 성능 및 성과 ... 31 3. 지적 재산권 출원 및 논문 발표 ... 32 2 절 관련 분야에의 기여도 ... 33제5장 연구개발결과의 활용계획 ... 34 1 절 타 연구에의 응용 ... 34 2 절 사업화 추진 방향 ... 34 3 절 추가 연구의 필요성 ... 34제6장 기술개발과정에서 수집한 해외과학기술정보 ... 36제7장 참고문헌 ... 37첨부자료 ... 38 A-1 Structural Analysis ... 38 A-2 골프 운동시 전동 풀카트 이용에 따른 생리적 요인 비교 ... 46끝페이지 ... 61