的工作稳定性，这对于以稳定高效的精度分级为生存法宝的超声波振动筛来说无疑是致命的。 Insufficient voltage accuracy or unstable voltage will seriously affect the working stability of the ultrasonic vibrating screen, which is undoubtedly fatal to the ultrasonic vibrating screen which is classified as a survival magic weapon with stable and efficient accuracy. Therefore, it is important to learn how to control the voltage of the ultrasonic vibrating screen, keep its voltage stable, and then maintain the accuracy of the ultrasonic vibrating screen.
The constant pressure control of the ultrasonic vibrating screen is realized by fuzzy PID composite control. This fuzzy PID composite control refers to a control method combining fuzzy technology and conventional PID control algorithms. The starting point of this improved control method is mainly due to the poor performance of the fuzzy controller in eliminating the steady-state error of the system of the ultrasonic vibrating screen, which makes it difficult to achieve high control accuracy.
The advantage of the integral regulator of the PID regulator is that it can theoretically control the steady-state error of the system to zero, which has a good effect of eliminating errors. Therefore, the fuzzy control and PID regulator are combined to increase the steady-state control performance.
The accuracy and tracking performance of the fuzzy controller of the ultrasonic vibrating screen must acquire more linguistic values for the linguistic variables. That is, the finer the bins, the better the performance, but at the same time, the disadvantage is that the number of rules and calculations also increase greatly. This makes debugging more difficult, and the controller's real-time performance is difficult to meet the requirements.
The ultrasonic vibrating screen is controlled by different control methods in sections, and one of two options is selected according to the switching logic, that is, fuzzy control is used in a large deviation range, and PID control is used in a small deviation range, which is equivalent to a switch function. Although switching modes in this pass.
PID hybrid structure has certain adaptability to complex systems. However, when the selection of switching logic directly affects the control performance of the rotary vibrating screen equipment system, how to achieve smooth switching to reduce disturbances and oscillations and ensure the stability of the system has always been a difficult problem to solve.
The space vector in the voltage space vector pulse width modulation of the ultrasonic vibrating sieve is not only sinusoidal in spatial distribution, but also sinusoidal in time for the space vector at each determined position. In this way, the problem of the circular magnetic field of the ultrasonic vibrating screen motor can be converted into the control problem of the voltage space vector.
Ultrasonic vibrating screen voltage space vector pulse width modulation is actually a special switching trigger sequence and pulse width combination corresponding to the three-phase voltage source inverter power device in permanent magnet synchronous motors.This control method can be used in A sinusoidal current with a small 120 ° waveform distortion in the custom coil.
。 Jinhe Machinery has a series of efficient equipment R & D-production-quality inspection-shipment processes and a scientific workshop management system. It continuously learns and introduces cutting-edge screening technology and has been tested by dozens of technical personnel. Innovation, according to the physical and chemical characteristics of different materials, develop and produce a variety of special-purpose ultrasonic vibrating screens with different characteristics suitable for different fields. At the same time, the delivery cycle is greatly shortened, and all customized equipment ensures delivery within 3-5 days.
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