37results about How to "High speed control precision" patented technology

The invention belongs to the field of rapid food safety detection, and provides a digital rapid food safety detection system, which mainly comprises a detection host machine unit, a sample pretreatment unit and a power supply module, can be provided for detecting a plurality of physical and chemical items, pesticide and veterinary drug residues, and biotoxins, has characteristics of rapid detection, high sensitivity, high informatization degree, and sample treatment-sample detection-informatization management integration, is an optimal selection for safe and rapid on-site detection, meets requirements of enterprise laboratories on food safety routine detection, and has strong promotion and application values. In addition, the detection host machine unit has the following characteristics that: temperature control precision and rotation speed control precision are high, functions of precise timing, short shock inching, temperature calibration and power-down recovery are provided, three functions such as constant temperature maintaining, oscillation and timing can be manually switched, the machine with a plurality of uses can be achieved, and equipment utilization can be increased.

The invention discloses a parameter setting method for an auto-disturbance rejection controller of a speed loop of a permanent magnet synchronous motor. A speed and current double-closed-loop controlstructure is established, a grey wolf population strategy is initialized according to tent mapping reverse learning, a convergence factor which nonlinearly changes along with the increase of the number of iterations is adopted, a left flight strategy is introduced into a wolf group position updating link in an algorithm to perform mutation operation, and finally, set parameters are obtained. According to the invention, the grey wolf optimization algorithm population is improved from initialization. A grey wolf population is initialized according to a tent mapping reverse learning strategy, a convergence factor which nonlinearly changes along with the increase of the number of iterations is designed, and a left flight strategy is introduced into a wolf group position updating link, so thatan improved grey wolf optimization algorithm is provided. The diversity of the initial population of the algorithm can be improved, the adaptability and adjustability to complex search are better, thealgorithm can be prevented from falling into local optimum, the convergence rate and global optimization capability of the algorithm are improved, and the effect is better than the effects of other improved grey wolf optimization algorithms.

The invention aims at providing a control method for a novel brushless motor to reduce torque ripples when the brushless motor runs by introducing a torque loop and a commutation compensation. According to the specific technical scheme, the method comprises the following steps: (1) determining a torque required by the motor by a difference value between a given rotating speed and an actual rotating speed; (2) determining the duty ratio by the difference value between the given torque of an outer loop and the actual torque of the motor; (3) simultaneously carrying out the step (1) and the step (2), and adopting a control strategy for switch tube lag shutdown to reduce the torque ripples caused by a commutation; and (4) driving a switch according to the duty ratio as shown in the specification obtained by a front double closed loop control algorithm and the direction of the torque. According to the method, the working range of the motor is expanded through a commutation compensation method for a lagging commutation; a neural network control algorithm used by the outer loop is quick in response, small in steady state error and small in overshoot; an inner loop utilizes a torque loop instead of a current loop, so that the control accuracy on the motor is greatly improved; and the ripples of the motor in the commutation are reduced.

The invention discloses a spreading vehicle for an emulsion type snow-melting agent. The spreading vehicle comprises a bearing vehicle body, a snow-melting agent storing tank and a spraying system used for spraying snow-melting agent in the snow-melting agent storing tank onto a road. The spraying system comprises multiple spraying devices, a conveying pipeline, a snow-melting agent pump and an alternating-current variable-frequency speed control system used for controlling the speed of the snow-melting agent pump. The snow-melting agent pump is a quantitative pump and is installed on the conveying pipeline. The spreading vehicle is simple in structure, reasonable in design, easy and convenient to operate and good in use effect, and the spreading amount of the snow-melting agent is controlled by controlling the speed of the snow-melting agent pump through the alternating-current variable-frequency speed control system. The invention further discloses a spreading operation control method of the spreading vehicle for the emulsion type snow-melting agent. The spreading operation control method comprises the steps that firstly, spreading control parameters are set; secondly, the bearing vehicle body is started, and the spraying devices are opened; thirdly, the bearing vehicle body moves, and the snow-melting agent is spread. The spreading operation control method has the advantages that the steps are simple, design is reasonable, implementation is convenient, the spreading amount control effect is good, and the spreading amount and the spreading uniformity of the snow-melting agent can be effectively controlled.

The invention discloses a micro turbojet engine control system and a starting control method. The micro turbojet engine control system comprises an auxiliary controller, a main controller, a console controller and a measurement and control system. Wherein the auxiliary controller is installed in an engine shell, and starting motor driving, hot fire head driving, valve driving, vibration measurement, temperature measurement and rotating speed measurement are achieved; the main controller directly drives the oil pump, controls the auxiliary controller to realize a main control algorithm, and measures thrust through an engine pedestal; the console controller is used for giving action instructions of each actuating mechanism, giving signals of an accelerator push rod and acquiring feedback signals; the auxiliary controller, the main controller and the console controller are communicated through a bus; and the measurement and control system is connected to the main controller, so as to display parameters of the sensor, manually control the actuating mechanism and record test data. Starting and operation control over the micro turbojet engine is achieved through the control system, and the micro turbojet engine control system has the advantages of being simple in connection, high in control precision, flexible in combination, convenient to test and the like.

The invention discloses a geotechnical engineering drum type centrifuge device, which includes an outer shaft and an inner shaft. The outer shaft is a hollow shaft, and used for driving a model grooveto rotate; the inner shaft is installed inside the outer shaft, driven by an inner shaft motor, and used for driving an actuator platform to rotate; the outer shaft and the inner shaft do not touch,and the outer shaft and the inner shaft are arranged on the same axis; the outer shaft motor is a direct drive motor, and the outer shaft passes through the outer shaft motor and is driven by the outer shaft motor; and synchronous or asynchronous motion of the outer shaft and the inner shaft is achieved through a cross coupling control method. According to the geotechnical engineering drum type centrifuge device, the outer shaft is directly driven by the direct drive motor, and the characteristics of rapid start, high rotating speed control accuracy, stable operation and the like are achieved;and synchronous or asynchronous motion of the outer shaft and the inner shaft is achieved through the cross coupling control method, and the vibration effect caused by synchronization of mechanical connection (a clutch) can be avoided.

The invention relates to a motor speed loop PI control method and system, equipment and a computer storage medium. The method comprises the following steps: carrying out the differential processing of the position angle of a motor rotor shaft, and obtaining the feedback rotating speed of a motor; performing integral processing on the motor instruction rotating speed to obtain a motor instruction angle; obtaining a first output part according to the motor instruction rotating speed and the motor feedback rotating speed; obtaining a second output part according to the motor instruction angle and the motor rotor shaft position angle; and obtaining a torque current instruction according to the first output part and the second output part. The rotating speed control precision of the low-line-number encoder at a low speed is improved, and the rotating speed period consistency of the motor is ensured.

The invention relates to the technical field of automatic transmission control, and discloses an intermediate shaft brake control method. The intermediate shaft brake is inflated by opening the air inlet electromagnetic valve and closing the air exhaust electromagnetic valve, and the intermediate shaft braking capacity is established; after a period of time, the air inlet electromagnetic valve and the exhaust electromagnetic valve are closed, so that the air pressure of the intermediate shaft brake is kept, and the intermediate shaft is braked with stable braking torque; before the intermediate shaft rotating speed reaches the intermediate shaft rotating speed control target value, an exhaust electromagnetic valve is opened, intermediate shaft brake exhaust and intermediate shaft braking release are carried out, and if the intermediate shaft rotating speed does not reach the intermediate shaft rotating speed control target value and intermediate shaft braking release is carried out, the process is repeated; and until the intermediate shaft rotating speed reaches the intermediate shaft rotating speed control target value. Rapid speed reduction of the intermediate shaft is achieved, the rotating speed control precision of the intermediate shaft is improved, and it is guaranteed that when the rotating speed of the intermediate shaft reaches the target rotating speed of the intermediate shaft, intermediate shaft braking is relieved.

The invention discloses a track operation vehicle power transmission method. A track operation vehicle comprises a power vehicle and an operation vehicle. The method comprises the following steps: A)setting an overall power supply system, a high-speed walking system and a low-speed walking power source on the power vehicle, setting a low-constant speed walking system on the operation vehicle, andsetting an operation system on the operation vehicle independently or on the power vehicle and the operation vehicle; B) supplying power to the operation system from the overall power supply system,selectively supplying power to the high-speed walking system and the low-speed walking power source, and providing an electric transmission traction system for the high-speed walking system; C) providing a hydraulic power source for the low-constant speed walking system from the low-speed walking power source, and providing an electric transmission static hydraulic transmission traction system forthe low-constant speed walking system. By adopting the method, the technical problem of power transmission of a double-power source tract operation vehicle in high-speed walking and low-speed walkingmodes can be solved, and requirements on walking speeds and control precision under different working conditions can be met.