The effect of electrical switch structuraldesign to the contact point voltage drops and temperature variations

• Main Authors: Lan, Mao-lung, 藍茂隆
• Other Authors: 黃秋虎
• Format: Others
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/87195539846753638397

碩士 === 正修科技大學 === 機電工程研究所 === 96 === Due to the continuing renovation of the technology and the demand of the consumer, electricity has become on the important factors that affects people’s life. The excitation type electric switch is an important element of the electrical facility and has been used intensively in industry and transportation, such as electrical bicycle, electrical motor cycle, winch etc. As the increasing usage of the electrical switch, the requirement to the switch increases as well. The important factors are contact point mass transferring loss, electric arc energy and contact point resistance and loss. Once the contact point fails to function, the whole electrical device ceases to function. However, regarding to the electrical efficiency, in addition to the effect of the contact point, the structure is an important factor. In this study the structure of the excitation electrical switch are studied and the effect of spring stiffness, guiding pin and ring are discussed. Taguchi method is used to design the experiment. L9(34) Orthogonal Array table is used to discuss the effect of four factors to the desired characteristic; that is to minimize both the contact voltage drop and the contact point temperature increase. Four factors chosen are guiding pin material, compression spring, contact spring and ring. Test results show that contact point spring has the most effectiveness to the contact voltage drop and temperature increase. Compression spring affects the acting and release voltage. Guiding pin and ring type have minimum influence. The final configuration is the following: compression spring stiffness; 0.7kg/3mm, guiding spring stiffness: 0.651 kg/7.9mm, guiding pin material F5770 and shaft ring.