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For limitation in switch selection and the torque ripples in the traditional direct torque control, an improved direct torque control method is proposed in this paper. This control strategy combines the direct torque control strategy and model predictive control strategy. First of all, pre-select the switching states from the direct torque control strategy and then select the switching state of the...
This paper investigates the formation control of multiple wheeled mobile robots with differential drive. Based on the kinematics models of the leader-follower system in Cartesian coordinates, four control laws are derived by the straightforward input-output linearization method, and asymptotical stable for the formation control system is achieved by the proposed control laws. Simulation studies are...
Low light utilization rate of about only 5% for LED backlight that needs much more LEDs to ensure the luminance of LED display is rather a challenge, which offers one reason for LED display's high price [1]. In this paper, effect of reflecting property of cavity walls and emergent angle of the light emitting from LED on the transmittance of prism sheets in bottom-lit LED backlight system was investigated...
In this paper, firstly, the precise lead frame LED module is built with the help of 3D microscopy. Secondly, the micro stamping technological parameters and processing steps are analyzed according to the actual production. With the information obtained, the micro stamping processing is simulated by non-linear FEA software ABAQUS, which focuses on angle deflection of lens in the process of micro stamping...
In the environment of the financial crisis, many enterprises are facing the risk of bankruptcy. The application of user innovative approaches can improve the competitiveness of enterprises. The traditional concept thinks that technological innovation is mainly completed by the manufacturer; this paper holds the opinion that in many industries, technological innovation is completed by the user or by...
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