The Study of Strength Improvement For Totally Enclosed Fan-cooled Electric Motor’s Plastic Fan
|關鍵字:||塑膠風扇;迫取孔;拉伸試驗;抗張強度;分析;馬達;Catia;plastic fan;tensile test;FEM;motor|
經過實驗與分析結果顯示，將現有風扇迫取孔形狀改善，同時使用Nylon + 20% Glass fiber，風扇的強度最佳且產生的應力亦最小，
For recent application of ventilation fans, considering the cost and the facility during process and assembling, metal fans mounted in totally enclosed fan cooled type motors are being gradually replaced by plastic ones. Though light weight, ease to assemble, low cost and simple storage are considered as the main advantages of plastic fans, its strength comparing with metal fans is inevitably weaker. Furthermore, plastic fans failed or fractured relatively easily especially during high speed operation, which seriously influence motor's operation. While the utilization of plastic fans is an unavoidable trend, the main point of this research will focus on increasing the strength of plastic fans. Solutions for improving plastic fans' strength were compared by analyzing different types of plastic materials, mechanical property test and finite element analysis, which will also be a fairly important reference for quality improvement. The first step is to define the mechanical property by tensile test. Then use Catia (software) to analyze stress distribution on the fan blades,and check if the current design is adequate. Shall it is not sufficient, the application of a variety of different materials and design were selected in order to improve the strength and increase the fan's safety factor. From experiments and analysis, it is found that modification of the form of fan's jacking holes and apply Nylon + 20% Glass Fiber as fan material could achieve the best strength and the least stress. This result is proposed as a suggestion for improving fan material's strength.