The Research And Development Of SIT500 Part-turn Electric Actuators

Nowadays electric actuators at the domestic market are mostly multi-turn machines with the gearbox, which cannot be used in desulfurization situation because of the large size and high cost. Part-turn intelligent electric actuators with small size, low cost and powerful feature need be developed by manufacturers to meet the urgent market demand.The purpose of this project is going to design a part-turn form intelligent electric actuator with an output torque of 500 Nm, whose travel range is from -5 ° to 95 °, and it may take less than 20 second to finish the whole travel. The product is named as SIT intelligent electric actuators. Electric actuator includes four blocks which is a power supply (motor), the main transmission (gearbox), accessories (hand wheel, handle, remote control, etc.), and the control section. The main transmission is the main factor which would determine the output form, structure, size, appearance, travel time and other factors of the actuator. It is the core designing of the electric actuator mechanism. According to the project specific parameters required, and following the principle of safe, reliable, simple, the overall design and optimizing was finished by focusing on the mechanical part of SIT intelligent electric actuators.In the design process, many current domestic and foreign actuators were analyzed to determine the most optimal program. The brushless DC motor drive was determined to use after comparing strengths and weaknesses of many motors on the present market; according to the travel time requirements and motor speed, the main reduction gear ratio was obtained. It was also determined to be used the combination structure of cylindrical gears and’worm and gear’. Specific parameters were calculated for each drive transmission, which is used to design the critical part, the gear housing. During the time, a three-dimensional model and FEA model of the main drive and gear housing were established to simulate the states by force of main drive gear, worm and other key parts, gaining deformation and stress distribution to ensure the reliability of the design. After the analysis of driving principle and analog form of brushless DC motors, the no-sensor mode driver was designed. Finally, all designs of the above content were pass the test validation, and gain the positive conclusion.In this essay, the virtual prototyping technology was finally applied in the design process on the part-turn intelligent electric actuator with the output torque of 500Nm, combined with a theoretical design and simulation, constantly improving the overall system design. By proposing a comprehensive design program including a set of functional analysis, checking the theory, design verification to meet the design requirements of SIT500 intelligent electric actuators. Finally, the actual manufacture and test results show that overall design and performance of SIT500 intelligent electric actuators are reasonable and stable, which can achieve the design goals desired.