The application of regional dynamic control ultrasonic motor in gasoline generators Zhu Hua, Chen Zhihua, Zhao Yusheng (Nanjing University of Aeronautics and Astronautics, Nanjing 210016) The voltage output system, in, take the Gaussian distribution. The error rate of change and the membership function of the output are similar. The language variables take pb, ps, zo, ns, nb, which represent positive, small, zero, negative, and negative.
(e) The deblur of the fuzzy control quantity adopts the center of gravity method, and the scale factor is determined according to the voltage control range of the ultrasonic motor is 0.25. 4 The result of the load experiment In the course of the experiment, the output of the generator is given every 2 s through the relay switch. The result is that the 150W electric furnace wire is loaded once and the output data of the A/D port is read.
It can be seen from the load experiment that when the throttle adjustment mechanism is not working, the output voltage of the generator has a fluctuation of ±0.5V, which is caused by the performance of the generator itself, such as uneven combustion of gasoline, which is beyond the scope of this paper. .
When the generator is connected to a load of 150W, if it is not controlled, the fluctuation of the average value of the voltage fluctuates between 13.8V and 0.7V. As the load power increases, the output voltage decreases sharply; in the closed-loop system, the average value of the voltage is stable 0.2. V. Therefore, through the function of the controller, the stability of the output voltage of the generator when its load changes can be obviously improved, which can meet the needs of engineering applications.
5 Conclusion In this paper, based on the practical problem that the output voltage of the portable generator is unstable during use, an automatic control system with a traveling wave type ultrasonic motor as the actuator is built. Through the adjustment of the system, the output voltage of the generator is effectively stabilized, and the working efficiency of the gasoline generator is improved.
To sum up the full text, the following three conclusions can be drawn: the advantages of the traveling wave type ultrasonic motor can be fully exerted in this system. The TRUM-45 ultrasonic motor achieves a practical level and flexible structure. It can be directly designed into a servo actuator in engineering, especially suitable for the control of small intelligent valves.
The establishment of the mathematical model of the control system is very difficult. Choosing a robust fuzzy control method can make the control algorithm simple and achieve good control effects. However, if the characteristics of the ultrasonic motor itself can be considered in the selection of the control target, such as selecting the phase difference of controlling the two-phase driving voltage and controlling the amplitude of the driving voltage, further optimization of the control performance can be achieved.
According to the results of this study, using the microcontroller or DSP technology to integrate and miniaturize the system, it can be widely applied to engineering practice.
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