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In practical cladding processes, any small parameter variation may cause undesired geometry changes. Therefore, a fast and robust controller design is required to ensure the quality of the process. In this paper, a robust vision-based controller with a specified interval phase-margin performance for laser cladding processes is presented. First, a practical nonlinear laser cladding processes was modeled...
This paper presents a newly designed current integral control strategy for a single-stage Buck-type LED lighting driver. The proposed system requires neither analog multipliers with traditional power factor correction circuits nor sensing input voltage to make the power factor and constant current output reachable. The design concepts are to make the impedance of line input end similar effect of an...
The position sensor-less brushless DC (BLDC) motor driver was proposed in this work. The three-phase BLDC fan motors are utilized for cooling the computer products. Generally, the Hall sensor is used to extract the rotor position information. However, the sensor component is very sensitive to heat and noise signals. Therefore, the sensor-less control technique was developed. The proposed sensor-less...
A constant current output Flyback converter with power factor correction used for LED driving is presented in this paper. The inductor voltage detection method is applied and acquired the inductor voltage to generate the control signal. Based on this design principle, the inner loop of input current shaping is eliminating, the input voltage sensing and multiplier are also not necessary. The simulation...
This paper presents a brushless DC motor (BLDCM) control system that does not require Hall sensor and speed encoder for an air conditioner fan motor. Using low cost circuits, the zero-crossing points are detected to estimate the commutated timing and speed information. Hall element shortcoming can therefore be eliminated. A modified six-step square wave pattern with pulse-width modulation is developed...
Focused on the reverse movements of moving axes along five-axis tool paths, this study presents a procedure of removing a gouge phenomenon on impeller surfaces in five-axis machining. That is, when an impeller of a centrifugal compressor is being cut in finish milling, reverse movements and/or other linearization problems of moving axes along a five-axis interference-free tool path may make a cutter...
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