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Electric vehicles require a high-power device, such as a semiconductor power device, for their power control. Power devices have the drawback of high heat-generation. Water-cooling is an effective method for cooling these power devices. Their durability is affected by the performance of the shaft seal in the coolant pump. The shaft seal, in which a rotating shaft passes between liquid phase and gas...
A biomimetic bearing seal system has been developed to reduce frictional loss and improve the separation of air and water. The seal mimics the material properties and mechanical characteristics of articular cartilage found in natural synovial joints. It is made of the hydrated material polyvinyl formal (PVF), which has a porous structure, high wear resistance, and exhibits low frictional resistance...
An all-new sealing system for a rotating shaft, which specializes in excellent separation between water and air, has been developed for installation in an ocean current or tidal power generator. Two seal lips made of a polyvinyl formal (PVF) were attached to a rotating shaft, and an aqueous solution of 3.0 wt% polyethylene glycol (PEG), a non-Newtonian fluid with a molecular weight of 2.0 million,...
An environmentally friendly and low-friction bearing for applications such as tidal power generation is proposed using biomimetic technologies. A biomimetic bearing was successfully developed using a hydrated material, polyvinyl formal (PVF), which mimics articular cartilage in a natural synovial joint. A non-Newtonian fluid, polyethylene glycol (PEG) dissolved in distilled water, was used as a lubricant,...
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