Final thesis deals with development of actuator for automatic door opening. With the objective of making the product cheaper and better, an alternative concept was developed. It should replace most of gears with rope made of synthetic fibers. In the first part basics of an actuator, theory of belts and synthetic fibers (kevlar, dyneema) are described. Then effects of knots on rope strength and rapid prototyping are presented. In the second part the two concepts, calculation based on belt theory, prototype manufacturing and rope tests are presented. A gear load-carrying capacity calculation was also made. With the prototype a required force was achieved.
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