46results about How to "Strong ability to resist load disturbance" patented technology

The invention discloses a control method of a driving system of a permanent magnet synchronous motor of an electrical automobile considering iron loss, and provides a control method of a driving system of a permanent magnetic synchronous motor considering iron loss based on a self-adaptive fuzzy backstepping method, which solves the non-linear problem of the power driving and control system of the motor of the electrical automobile, enables the motor to quickly reach the stable running state and is more suitable for the control objects requiring quick dynamic response, such as the driving system of the electrical automobile. The control rules u[d] and u[q] only adopt one self-adaptive parameter theta, so as to reduce the calculation amount. The method has the advantages that the problem of position tracking and control of the permanent magnet synchronous motor considering the iron loss under the conditions of orienting to the site and having undetermined parameter and load torque disturbance is solved; the fuzzy logic system is used for approximating to the unknown non-linear item, and the self-adaptive fuzzy backstepping method is used for enabling the tracking error to approximate to 0; the more accurate control precision is reached, and the ideal position tracking and control effect is ensured.

The invention discloses a construction method for an FNN (fuzzy neural network) inverse controller of an AC (alternating current) electromagnetic levitation spindle based on rough set theory, comprising the steps as follows: taking a second derivative of a composite controlled object expected to output as input of an FNN inverse system based on the rough set theory, determining a basic structure of the FNN inverse system based on the rough set theory, selecting static experimental data, training offline the FNN based on the rough set theory to implement inverse of a composite controlled object model, constructing the FNN inverse system based on the rough set theory, constructing an inverse system of the composite controlled object by adopting an FNN inverse method based on the rough set theory, and coupling an AC electromagnetic levitation spindle system which is a nonlinear, strongly coupled multi-input multi-output system into a pseudo linear system. According to the construction method, independent control among 5 DOF (degree of freedom) offset variables of the AC electromagnetic levitation spindle can be implemented; meanwhile, better control performance and load disturbance resistance capacity can be acquired.

The invention discloses a backstepping step based double-mechanical arm force/position fuzzy mixing control method. In the method, aiming to the force/position control precision requirement for a collaborative robot and the nonlinear problem in a system, the control quantity of a robot system is restrained based on a Lyapunov function; and meanwhile, by utilizing a nonlinear function in a fuzzy logic system approximation system, a fuzzy self-adaptive position tracking controller is constructed. By adopting the method, a tracking error of the system can be ensured to be converged to a sufficiently small neighborhood around an original point, a contact force between an end effector and a target object can be controlled in a defined range, and a simulation result shows that the new control method ensures various state quantities of multiply mechanical arms to be in a constraint space of the system, and input of the controller is stabilized in a bounded region. The method realizes rapid and effective response to force/position tracking and controlling of double mechanical arms.

The invention discloses a design method for an induction power transmission system having the characteristics of constant current, constant voltage and constant frequency. An induction power transmission system model for a primary-side parallel resonance circuit and a secondary-side series resonance circuit is taken as a research object; the conditions of constant primary-side resonance current, constant resonance working frequency of the system and constant load output voltage are put forward on the basis of an alternating-current impedance method; and parameters of a resonance circuit are comprehensively designed according to the conditions, so that the induction power transmission system having the characteristics of constant current, constant voltage and constant frequency is formed. The design method has the beneficial effects: the primary-side resonance current, the resonance working frequency of the system and the load output voltage which are simultaneously and approximately constant are naturally ensured without adding a traditional closed-loop control circuit, the system structure is simplified and the production cost is lowered.

The invention relates to a load disturbance resistant method and a device thereof based on a hybrid regulator and belongs to the field of permanent magnet synchronous motor servo control. The load disturbance resistant device based on the hybrid regulator comprises a personal computer (PC), a controller, a voltage detection unit, an isolation drive unit, a current detection unit, a rotation speed detection unit, a three-phase non-control rectifier bridge, a bus energy storage capacitor, a three-phase full bridge inverter, a permanent magnet synchronous motor, an encoder and an adjustable load. According to a speed ring, the hybrid regulator is adopted to replace a rotation speed PI regulator of a traditional closed-loop system, and influence on rotation speed fluctuation by load disturbance is restricted. In the hybrid regulator, load torque and the rotation speed serve as state variables, a difference of practical rotation speed and observed rotation speed is defined to be a slip form switching surface, and a slip form load torque observer is designed to be used for achieving online identification of the load torque. The load disturbance resistant device based on the hybrid regulator is suitable for the permanent magnet synchronous motors of different rotor structures, effective under different current control modes and wide in application range.

The invention discloses a command filtering-based synchronous motor neural network back-stepping discrete control method. In order to solve the problem that a permanent magnet synchronous motor has many variables and strong coupling, and is easily affected by external load and motor related parameter changes, a neural network adaptive controller is designed based on a command filtering technologyand the principle of a back-stepping method; the neural network technology is used to approximate unknown nonlinear terms; the adaptive back-stepping method is applied to the design of the controller;and the command filtering technology is used to solve the problem of computation explosion. According to the method of the invention, complete controller design which is absent in a traditional method is supplemented, so that Lyapunov stability analysis is improved; after being subjected to the control and adjustment of the controller, the operation of a motor can quickly reach a steady state, sothat the motor is more suitable for a control object requiring fast dynamic response; and simulation results show that the novel controller overcomes the influence of parameter inaccuracy, ensures anideal control effect, and achieves the fast and stable tracking of a position.

The invention discloses a voltage injection single period control Buck converter and a control method thereof and belongs to the control field of an electric power converter. The Buck converter comprises a Buck converter main power circuit, a single period control circuit and an output voltage sampling conditioning circuit, an output voltage signal is sampled, an output voltage and an output reference voltage are compared to acquire an error voltage, the error voltage is compensated through a compensator to acquire a compensation voltage, the compensation voltage and a diode voltage sampling signal add together, an addition result is inputted to a resettable integrator inverting end, and an integrator output signal and the output voltage reference are compared to acquire a duty ratio of a switch tube of the Buck converter. According to the Buck converter, on the basis of original single period control, the sampled output voltage signal is injected to a resettable integrator, response to input voltage disturbance and load disturbance can be simultaneously realized in a single period, and thereby disadvantages of single period control load adjusting performance can be solved.

The invention discloses an asynchronous motor fuzzy discretization control method based on command filtering. Aiming at the nonlinear problem existing in the asynchronous motor drive and control system, this method introduces command filtering technology in a traditional back-stepping design method and successfully overcomes the problem of computational explosion arising from the continuous derivation in the traditional back-stepping control. The method uses a fuzzy logic system to approximate the non-linear function in the motor drive system, and combines the command filtering technology with an adaptive method to construct a controller. After the adjustment of the method, the motor operation can reach a steady state quickly; and the simulation result shows that the method of the present invention can overcome the influences of inaccurate parameters and helps to ensure a desired control effect, achieving a fast and stable response to the rotation speed.

The invention discloses an asynchronous motor position tracking control method based on a finite time dynamic surface. Aiming at the problems of iron loss and input saturation in an asynchronous motor, the control method introduces a dynamic surface technology into the traditional backstepping method, and successfully overcomes the problem of 'calculation explosion' caused by continuous derivationin the traditional backstepping control; the method utilizes a fuzzy logic system to approach a nonlinear function in a motor driving system, and combines a dynamic surface technology with finite time to construct a controller; after the method is used for regulation, the output signal can track the expected signal within a limited time, and a simulation result shows that the method can accelerate the response speed, can improve the anti-interference capability, can reduce the tracking error and can achieve an ideal tracking effect.

The invention discloses an observer-based electric vehicle permanent magnet synchronous motor system error compensation control method. According to the problems of nonlinearity and iron loss in an electric vehicle motor driving and control system, a command filtering technique is introduced into a traditional back-stepping design method; a compensation mechanism is introduced, so that error caused by filtering can be reduced, and therefore, control precision can be improved, and the problem of calculation explosion caused by continuous derivation of traditional back-stepping control can be solved; and a dimensionality reduction observer is adopted to estimate the angular velocity of the rotor of a permanent magnet synchronous motor, a fuzzy logic system is utilized to approximate a non-linear function in the driving system, and a command filtering back-stepping technique and an adaptive method are combined together to construct a controller. With the method of the invention adopted, the operation of the motor can achieve a stable state fast. The method is more suitable for such control objects as electric vehicle driving systems which require fast dynamic response.

The invention discloses an extreme learning machine based control method for an asynchronous motor drive system of an electric automobile. According to the invention, aiming at a problem of nonlinear and iron loss problem of a prior electric automobile motor drive system, a command filtering technology is introduced into a traditional backstepping design method. Through the introduction of a compensation mechanism, errors caused by filtering waves are reduced and a problem of calculation explosion caused by continuous derivation in traditional backstepping control is solved successfully. According to the invention, by utilizing the extreme learning machine algorithm for approximating a nonlinear function in the motor drive system, the method provided by the invention is combined with the command filtering technology and a self-adaptive backstepping method. Through regulation by utilizing the method provided by the invention, operation of the motor can reach a stable state quickly. The method is suitable for control subjects requiring quick dynamic response such as the electric automobile drive system. A simulation result shows that the control method provided by the invention can eliminate influence due to parameter uncertainty and is beneficial to ideal control effect, so that quick and stable response to rotation speed is realized.

The invention discloses a limited state-based permanent magnet synchronous motor fuzzy position tracking control method. According to the method, the problems of non-linearity and iron loss existing in electric automobile motor driving and control systems are solved; the state quantity and the control quantity of the motor system are restrained on the basis of a Barrier Lyapunov function, meanwhile, and a fuzzy logic system is utilized to approach a nonlinear function in the system, and a fuzzy self-adaptive position tracking controller is constructed. According to the method disclosed by theinvention, the tracking error of the system can be ensured to be converged into a small enough neighborhood of the original point; and the simulation result shows that the state quantities of the motor are ensured to be in the constraint space of the system by virtue of the method of the invention, and the input of the controller is stable in a bounded region. According to the method, the rapid and effective response of the position tracking control of the permanent magnet synchronous motor of the electric vehicle is realized, and the method is more suitable for a control object requiring rapid dynamic response such as an electric automobile driving system.

The invention relates to an aviation engine tail nozzle throat area control system. The system solves the problems that an existing high-power output tail nozzle throat area control system is large involume weight and poor in installation of an engine system. The system comprises n small-power electric cylinders and an integrated servo controller, wherein the integrated servo controller comprisesa control circuit, a power driving circuit and a power circuit, the core of the control circuit is provided with a dual DSP chip and FPGA chip combination structure, and the power driving circuit mainly comprises n IPM modules, n magnetic isolation circuits and 2n phase current sampling chips. According to the system, the IPM modules drive the small-power electric cylinders to act, and synchronous control of n path small-power electric cylinders is realized through the dual DSP chip and the FPGA chip.

The invention belongs to the technical field of permanent magnet synchronous motor position tracking control, and particularly discloses a permanent magnet synchronous motor finite time dynamic surface control method considering iron loss. Aiming at the problems of iron loss and input saturation existing in the permanent magnet synchronous motor, a dynamic surface technology is introduced into a traditional backstepping method to solve the problem of 'calculation complexity' in the calculation process, and meanwhile, a fuzzy logic system is used to approximate unknown nonlinear terms in a permanent magnet synchronous motor driving system. According to the method, through the finite time control technology, the system response speed is increased, and tracking errors are reduced; it can be guaranteed that the tracking errors of the system converge to a neighborhood which is small enough of an original point, and therefore, the response speed of the permanent magnet synchronous motor driving system is increased; and the method provided by the invention has good robustness and strong load disturbance resistance, and realizes an ideal control effect.

The invention discloses an asynchronous motor drive system control method based on an extreme learning machine. According to the control method, aimed at the nonlinear problems existing in an asynchronous motor drive system, a command filtering wave technology is introduced in a traditional backstepping design method, by introducing a compensation mechanism, the error generated by the filtering wave is reduced, and the problem of 'calculating explosion' caused by continuous derivation in a traditional backstepping control is successfully overcome. According to the control method, an extreme learning machine algorithm is utilized to approach a nonlinear function in the system, and the algorithm is combined with a command filtering wave technology and a self-adaption backstepping method. According to the control method, the operation of motor can quickly reach a stable state, the method is more suitable for control objects of an electric automobile drive system and the like which need fast dynamic response, a simulation result shows that the asynchronous motor drive system control method can overcome the influences of the uncertainties of parameters and is beneficial to the guarantee of an ideal control effect, and fast and stable response on the rotating speed is achieved.

The invention belongs to the technical field of voltage conversion system, and discloses a bi-directional power conversion system and a conversion method based on an insulated gate bipolar transistor,The system is provided with a circuit board, A current detector is mounted on the upper end of the circuit board, A low end of that current detector is electrically connected with a current protector, A low end of that current protector is electrically connected with an insulate gate bipolar transistor chip, A low end of that insulated gate bipolar transistor chip is electrically connected with afreewheeling diode chip, and two ends of the circuit board are tin-bonded with an insulated gate field effect transistor and a bipolar transistor, and the insulated gate field effect transistor and the bipolar transistor are respectively electrically connected with the insulated gate bipolar transistor chip and the freewheeling diode chip. The charging mode adopted by the invention can adjust thecharging power according to the capacity and characteristics of the battery through the increase or decrease of the module, and has the advantages of high utilization ratio of the DC voltage, adjustable output voltage, strong anti-load disturbance ability and bi-directional flow of energy.

The invention discloses an electrohydraulic position servo controller which comprises a comparator, a first potentiometer, a first integrator, a first subtracter, a second subtracter, a second potentiometer, a second integrator, a third subtracter, a fourth subtracter, a third potentiometer and a third integrator connected in series. The output end of a follower is connected to the input ends of the comparator, a fourth potentiometer and a first differentiator. The output end of the fourth potentiometer is connected to the input end of the first subtracter in series. The output end of the first differentiator is connected to the input ends of the second subtracter, a fifth potentiometer, and a second differentiator. The output end of the fifth potentiometer is connected to the input end of the third subtracter in series. The output end of the second differentiator is connected to the input end of the fourth subtracter in series. The electrohydraulic position servo controller has the advantages of complete functions, simple interfaces, the full feedback of displacement, velocity, acceleration and other state variables can be realized, a controlled electrohydraulic servo object has fast response without overshoot and has strong load disturbance resistance ability.

The invention belongs to the technical field of AC-DC-AC electric drive, and discloses a bi-directional power conversion AC based on IGBT. DC control system and method, The control system is providedwith an access terminal, a first high-voltage start-up switch tube, a circuit control terminal, a current source, a second high-voltage start-up switch tube, a monitoring device, a terminal, an upperswitch group, an isolator, a control system, a controllable switch, a power supply module, a comparator, a lower switch group, a three-phase inverter, a diode group, a display screen, a voltage sensor, a temperature sensor and a current sensor. The control system of the invention adopts a voltage outer loop and a current inner loop double closed loop system, wherein the voltage outer loop controlsthe output voltage and the current inner loop controls the input current, so as to realize the correction of the unity power factor. The DC system can be reassembled in multiple sets and the controlterminals are reserved, which can be distributed intelligently according to the BMS system and the current load level for the convenience of users.