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Aimed at the FPGA-based orthogonal magnetic encoder design, this paper analyzes several actual errors caused by the limitation of the processing technology and the assembly technology, which include the error caused by the imbalance of signal amplitude, the error caused by the nonorthogonality of signal phase, the error caused by the DC offset, and the error caused by harmonics. Based on ideal voltage...
This paper expounds the basic principle of SVPWM from the perspective of vector analysis, and derives the necessary mathematical formula to implement this digital design. Also, this paper presents a basic structure of the digital hardware circuit based on FPGA. The proposed scheme is implemented and verified on a single Altera FPGA. The experimental results are presented in the end and show that the...
A new Application Specific Integrated Circuit (ASIC) realization of high- performance servo system of four-axis actuators is proposed. This scheme integrates four-axis position loop, velocity loop and current loop on one-chip ASIC. Furthermore, the detail implementations of basic modules such as multiple axis synchronous control strategy, M/T algorithm, Pseudo Derivative Feedback +Feedforward (PDFF)...
This paper presents a novel design scheme of the five-axis actuator servo system for unmanned helicopter. According to the designed time schedule, five actuators are driven in synchronism by a digital controller implemented on one-chip field programmable gate arrays (FPGA). For the single-chip system, reliability of the actuator system is further improved, the arithmetic resource of the FPGA is fully...
This paper presents the application of magnetic encoders in the actuator servo system based on FPGA for the unmanned helicopter. The magnetic encoder outputs two quadrature voltage signals which change according to the angle position. The digital decoding circuit is designed based on the vector rotation algorithm in the controller, which can provide a digital angular position with 16 bit resolution...
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