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 control method for a mechanical energy storage system, which comprises the following steps that 1, one flywheel energy storage unit is connected in parallel with one wind driven generator, or a flywheel energy storage matrix is formed by the one flywheel energy storage unit and a plurality of other flywheel energy storage units; 2, a rotor position sensor acquires a rotating speed of a flywheel motor, and a current sensor acquires a current signal of a DC (Direct Current) bus; 3, a sampling value of a rotating speed error is calculated; 4, a neuron self-adaptive PID (Proportion Integration Differentiation) controller is used as a rotating speed controller, and an output control quantity of the neuron self-adaptive PID controller is calculated; 5, a current error signal of the DC bus is calculated; and 6, the current error signal is input into a current controller for controlling output of a PWM (Pulse-Width Modulation) wave, and PWM drives a bidirectional converter to control the flywheel motor to operate in an accelerated or decelerated manner. The control method is fundamentally different from other control methods designed for a three-phase permanent magnetic synchronous flywheel driving motor; vector control does not need to be carried out; and rotating speed control accuracy of the flywheel energy storage system and robustness of the system are greatly improved.

The invention provides a method and device for controlling the rotating speed of a roller, and relates to the technical field of agricultural machine control. The method for controlling the rotating speed of the roller comprises the steps that information of the rotating speed of the roller is input into a controller through a roller rotating speed sensor the controller compares the rotating speedof the roller with target rotating speed, and a rotating speed deviation value is obtained; the controller outputs a speed regulating signal according to the rotating speed deviation value, and sendsthe speed regulating signal to a corresponding speed regulating solenoid valve; after the speed regulating solenoid valve receives the speed regulating speed signal, the rotating speed of the rolleris regulated, so that the rotating speed of the roller is equal to the target rotating speed. According to the method and device, the technical problems that the rotating speed control precision of the roller of an agricultural machine is not high, and the rotating speed of the roller is not constant are solved.

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 rail operation vehicle transmission system. A rail operation vehicle comprises a power vehicle and an operation vehicle; the rail operation vehicle transmission system comprises a vehicle power supply system, a high speed running system and a low speed running power source, a low constant speed running system and an operation system, wherein the vehicle power supply system, the high speed running system and the low speed running power source are placed on the power vehicle; the low constant speed running system is placed on the operation vehicle; and the operation system is partially or totally placed on the operation vehicle. The vehicle power supply system provides a power supply for the operation system and can selectively provide power supply for the high speed running system or the low speed running power source; and the high speed running system adopts an electric drive traction system. The low speed running power source provides a hydraulic power sourcefor the low constant speed running system; and the low constant speed running system adopts an electric drive hydrostatic transmission traction system. According to the rail operation vehicle transmission system, a technical problem of power transmission of a double-power-source rail operation vehicle in high speed running and low running modes can be solved to satisfy requirements on a running speed and control accuracy under different working conditions.

The invention discloses an asynchronous motor control method without speed sensor driving, and belongs to the technical field of motors. Through adopting a voltage switching structure, the input voltage amplitudes and phases of flux linkage and a rotating speed observer are adaptively adjusted, so that the input voltage of the flux linkage and the rotating speed observer at a low speed is virtualvoltage, and the stable and reliable operation of an asynchronous motor driven by a speed sensorless control system at the low speed is ensured; the input voltage of the flux linkage and the rotatingspeed observer is close to the actual voltage at a high speed, so that the rotating speed control precision of the asynchronous motor driven by the speed sensorless control system during medium-high rotating speed operation is ensured; and the rotating speed of the motor and the flux linkage orientation angle of the motor are estimated, and the asynchronous motor is driven to operate normally by adopting a vector control method, so that the actual flux linkage current, the actual torque current and the estimated rotating speed of the motor are respectively consistent with the reference flux linkage current, the reference torque current and the reference rotating speed of the motor, and smooth switching between the virtual voltage and the actual reference voltage is realized.

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 motor sensorless drive control system which is applicable to a 10000-120000 RPM high-speed motor. The system mainly includes a DSP control processor, a bridge-type matrix circuit, a push-pull output drive circuit, an IGBT current-enlarging high-load bearer circuit, a high-speed sensorless detection circuit, a protection circuit, a CAN bus communication circuit, a high-low voltage isolation circuit and the like. PMSM control waveforms which are output by the DSP processor undergo power amplification through the bridge-type matrix circuit and the push-pull output drive circuit and then drive an IGBT current-enlarging module to control the high-speed motor. The system has undervoltage, overvoltage, overcurrent and temperature protection, fault memory protection, and CAN online system update program refresh functions and a fault diagnosis function which meets the ISO15765. The control system is adaptive to different kinds of permanent-magnet synchronous motors and capable of meeting control demands of new-energy automobiles at home and abroad and has characteristics of small volume, high controllable rotating speed and high efficiency.

The invention relates to an outer rotor embedded automatic control constant speed DC brushless axial flow fan and a constant speed control method, which can realize constant speed automatic control over the rotating speed of an outer rotor embedded axial flow fan. The outer rotor embedded automatic control constant speed DC brushless axial flow fan comprises an axial flow fan and a DC converter. An automatic control constant speed detection circuit is arranged in the axial flow fan. A detection head in a frequency-to-converter (F / V) converter in the automatic control constant speed detection circuit is positioned on one side of an outer rotor, and is used for detecting the rotating speed of the outer stator. The output end of an inverted adder in the automatic control constant speed detection circuit is connected with the power input end of the axial flow fan, and is used for adjusting the rotating speed of the axial flow fan. The outer rotor embedded automatic control constant speed DC brushless axial flow fan and the constant speed control method have the advantages of: 1, low cost of subsequent product development of a client; 2, simple use; 3, high rotating speed control accuracy; 4, low fan manufacturing cost; 5, long motor service life; and 6, high safety factor.

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 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 control method of an asynchronous motor driven by a speed sensor, which belongs to the technical field of motors. The invention adjusts the input voltage amplitude and phase of the flux linkage and rotational speed observer adaptively through the voltage switching structure, so that the input voltage of the flux linkage and rotational speed observer is a virtual voltage at low speed, and ensures the asynchronous speed under the drive of the speed sensorless control system. Stable and reliable operation of the motor at low speeds; the input voltage of the flux linkage and speed observer is close to the actual voltage at high speeds, ensuring the speed control accuracy of the asynchronous motor driven by the speed sensorless control system at medium and high speeds; The motor flux orientation angle is estimated, and the vector control method is used to drive the asynchronous motor to run normally, so that the actual flux current, actual torque current, and estimated motor speed of the motor are respectively related to the reference flux current, reference torque current, and motor reference speed. Consistent, the smooth switching between the virtual voltage and the actual reference voltage is realized.

The invention discloses a rail operation vehicle transmission system. A rail operation vehicle comprises a power vehicle and an operation vehicle; the rail operation vehicle transmission system comprises a vehicle power supply system, a high speed running system and a low speed running power source, a low constant speed running system and an operation system, wherein the vehicle power supply system, the high speed running system and the low speed running power source are placed on the power vehicle; the low constant speed running system is placed on the operation vehicle; and the operation system is partially or totally placed on the operation vehicle. The vehicle power supply system provides a power supply for the operation system and can selectively provide power supply for the high speed running system or the low speed running power source; and the high speed running system adopts an electric drive traction system. The low speed running power source provides a hydraulic power sourcefor the low constant speed running system; and the low constant speed running system adopts an electric drive hydrostatic transmission traction system. According to the rail operation vehicle transmission system, a technical problem of power transmission of a double-power-source rail operation vehicle in high speed running and low running modes can be solved to satisfy requirements on a running speed and control accuracy under different working conditions.

The invention relates to an outer rotor embedded automatic control constant speed DC brushless axial flow fan and a constant speed control method, which can realize constant speed automatic control over the rotating speed of an outer rotor embedded axial flow fan. The outer rotor embedded automatic control constant speed DC brushless axial flow fan comprises an axial flow fan and a DC converter. An automatic control constant speed detection circuit is arranged in the axial flow fan. A detection head in a frequency-to-converter (F / V) converter in the automatic control constant speed detection circuit is positioned on one side of an outer rotor, and is used for detecting the rotating speed of the outer stator. The output end of an inverted adder in the automatic control constant speed detection circuit is connected with the power input end of the axial flow fan, and is used for adjusting the rotating speed of the axial flow fan. The outer rotor embedded automatic control constant speed DC brushless axial flow fan and the constant speed control method have the advantages of: 1, low cost of subsequent product development of a client; 2, simple use; 3, high rotating speed control accuracy; 4, low fan manufacturing cost; 5, long motor service life; and 6, high safety factor.

The invention discloses an engine bench test system and a constant speed control method thereof. The system includes a torque sensor (2), a motor (3), a computer measurement and control system (4), and an AC frequency converter (5); The engine, the AC inverter, and the torque sensor are electrically connected; the AC inverter is electrically connected to the motor; one end of the torque sensor (2) is rigidly connected with the output shaft of the motor (3), and the other end is used for coaxial rigid connection with the output shaft of the engine. connect. By directly controlling the speed of the motor, the engine is stabilized at the set speed point, with high control precision, small fluctuations, and a smooth adjustment process. The maximum fluctuation of each speed point is about 1rpm. It solves the problem that the torque control method cannot stabilize the speed at the set speed under severe working conditions such as engine performance decline, single-cylinder fire failure, and short-term oil shortage, and truly meets the requirements of the engine test.

The invention discloses a driving device of a heavy-load scraper conveyor and a hydraulic system of the driving device. The driving device comprises a supporting plate, an active driving device, two driven driving devices and the hydraulic driving system, wherein the active driving device comprises a main fixing table provided with a power device, the power device comprises a bidirectional hydraulic motor, a photoelectric encoder, a torque sensor and a right-angle speed reducer which are connected together in sequence, the right-angle speed reducer is connected with a chain wheel shaft, two driving chain wheels are symmetrically arranged at the two ends of the chain wheel shaft, the driven driving devices comprise small fixing tables provided with power devices, right-angle speed reducerson the small fixing tables are connected with cantilever shafts, driven chain wheels are arranged on the cantilever shafts, the two driving chain wheels and the two driven chain wheels are connected together correspondingly through two parallel scraper chains, a plurality of scrapers are connected between the two scraper chains, and the hydraulic driving device provides power. The device is simplein structure, high in reliability, capable of achieving rapid starting and stopping under a large load and capable of effectively adjusting the tension difference between the two scraper chains of the scraper conveyer.

The invention discloses a taping machine main shaft structure and a timing interruption control method thereof. The main shaft structure comprises a base plate, a main transmission device, a belt feeding device and a belt wrapping device. According to the main shaft structure, the belt feeding device is additionally arranged between a belt releasing device and a belt winding device, so that the belt releasing tension and the belt winding tension are mutually independent, and the belt winding tension can be independently adjusted; a Mylar motor directly drives a Mylar to move, a transmission chain is short, and the transmission error is small; the rotation angle of a main shaft is measured through a rotary encoder, so that the number of pulses sent to a mylar motor driver is accurately controlled, and no accumulative error exists; angular displacement measurement is directly adopted for the main shaft, angular position control is adopted for the Mylar motor, and compared with traditional rotating speed measurement, the rotating speed control precision is higher, and the response speed is higher; timing interruption is carried out every several milliseconds, even if the rotating speed of the main shaft generates large disturbance, the Mylar motor can drive the Mylar to move along with rotation of the main shaft in time, and quantitative adjustment can be achieved.

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.