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China YUCUN dried laver seaweed company.Located in Cangnan County, Zhejiang province China, an important production of laver in china.fact, stepping displacement control system can improve performance , and does not require feedback. However , when the open loop stepper motor running , there will be loss of synchronization between the command and the actual pace of pace when possible . Many techniques can be used to obtain the CLC stepper motor displacement, velocity and torque control . According controllability order from low to high , including : nuclear footwork , counter- electromotive force (back electromotive force (emf) detection, or full servo method , however , the risk of open-loop manipulation step will be lost , which would produce positioning errors . but compared with the servo system using an encoder , using a closed-loop stepper motor encoders cost less. increase the capital increase to pay for the development of components or work means more capital , but also the extra costs system brings more benefits even increased the