gas fuel cell is to provide the energy source for the gas actuated tools.
The first fuel cells were invented by Sir William Grove in 1838. The first commercial use of fuel cells came more than a century later following the invention of the hydrogen–oxygen fuel cell by Francis Thomas Bacon in 1932. The alkaline fuel cell, also known as the Bacon fuel cell after its inventor, has been used in NASA space programs since the mid-1960s to generate power for satellites and space capsules. Since then, fuel cells have been used in many other applications. Fuel cells are used for primary and backup power for commercial, industrial and residential buildings and in remote or inaccessible areas. They are also used to power fuel cell vehicles, including forklifts, automobiles, buses, boats, motorcycles and submarines.
The shaft extension key of the three-phase asynchronous motor is damaged and the keyway is deformed; individual shaft extensions are broken off at the same time. Which important element of the design link went wrong? Today, the editor of Dalan Motor is doing a research specifically on this issue.
1. Material and selected material characteristics The motor shaft and shaft extension key are usually 45 steel, and the allowable stress under normal temperature, static load and general working conditions is 186 MPa.
2. Safety factor
The safety factor is related to many factors. Too large a safety factor will waste material; too small a safety factor may make the component unsafe. Generally, the following aspects should be considered:
(1) The accuracy of load estimation;
(2) Simplify the accuracy of the process and calculation method;
(3) The uniformity of the material;
(4) The importance of construction;
(5) Working conditions of parts, reduction of self-weight and other factors. The values ​​of general components are: plastic materials are defined as 1.5 to 2.0 according to the yield limit; brittle materials are defined as 2.0 to 5.0 according to the strength limit. The above allowable stress is 186MPa, indicating that the safety factor is 353/186 = 1.9.
3. Determination of allowable stress
The shaft and shaft extension key are 45 steel, and the allowable stress (tensile and compression) [σ] = 186MPa. Allowable shear stress [τ] = (0.6 ～ 0.8) × [σ] = 112MPa, allowable extrusion stress [σjy] = (1.7 ～ 2.0) × [σ] = 316MPa.
4. Calculation steps of strength check
(1) Motor rated data: power P, speed n, service factor SF.
(2) The shaft extension and shaft extension key parameters are: shaft diameter d, key width b, key height h, and key length l.
(3) The axial cross-sectional area F = πd2 / 4.
(4) Torque M = P × SF / Ω, where Ω = 2πn / 60.
(5) The torsional section coefficient of the shaft W = πd3 / 16.
(6) Shaft extension strength condition: Ï„ = M / W
(Shaft extension key groove and shaft extension key strength condition: σjy = 2M / d / Fjy
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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