17 results about "Asynchronous machines" patented technology

A conductor bar of a cage rotor of an asynchronous machine has a longitudinal extension and includes first and second sections in the longitudinal extension. The first section has a hardness which is lower than a hardness of the second section and is realized through soft annealing, brief inductive heating or heating by a flame so as to enable a compression of the first section of the conductor bar by way of axial pressure after axially joining the conductor bar in a slot of a magnetically conductive body of the cage rotor, with the first section abutting an inner wall of the slot of magnetically conductive body of the cage rotor.

The utility model discloses an in-mold asynchronous machine workpiece positioning structure which comprises a workbench, a workpiece containing shell is fixedly connected to the workbench, adjusting sliding grooves are formed in the inner walls of the two sides of the workpiece containing shell respectively, first two-way screws are rotationally installed in the adjusting sliding grooves respectively, and one sides of the first two-way screws are connected with the two ends of first movable rods through thread structures. The other side of the first two-way screw is connected with the two ends of a second movable rod through a thread structure, a clamping assembly is movably arranged on one end face of the second movable rod, and a top column is fixedly connected to the middle of one end face of the first movable rod. The two corner positions of one end of a workpiece are clamped and fixed through the clamping assembly, then the middle of the other end of the workpiece is tightly jacked and fixed through cooperation with the jacking column, and then clamping and positioning of the workpiece are achieved; clamping and positioning of the workpiece can be achieved by operating the clamping assembly and the hand wheel, and compared with a traditional mode that clamping operation can be achieved only through cooperation of a plurality of threaded rods, the clamping device is more convenient and faster to use.

The invention discloses a thermal mass energy storage system power grading adjustment method based on virtual asynchronous machine control, and belongs to the technical field of thermal mass energy storage systems, and the method comprises the steps: converting the alternating current output by a power grid side into direct current in the process of injecting power into a thermal mass energy storage system by the power grid side based on a virtual asynchronous machine control method; according to the direct current-alternating current converter control method based on the V / f control strategy, power frequency alternating current of a power grid is improved to high-frequency alternating current so as to be matched with power pulsation of a heat storage device side; electric energy of high-frequency alternating current is converted into heat energy to be stored by a heat and mass energy storage system based on Rankine cycle; different heat capacity intervals are divided for the current heat mass energy storage working medium temperature according to the heat mass energy storage device, the virtual inertia coefficient of the virtual asynchronous machine is adjusted, an adjustment instruction is output based on the electric power level, and the power injected or released into the heat mass energy storage system is dynamically adjusted. According to the method, power dynamic balance and frequency support between the power grid and the Rankine cycle heat and mass energy storage system are realized.

The invention relates to the technical field of power system operation control and demand side response, in particular to a power grid inertia cooperative support control method containing a multi-heterogeneous virtual energy storage unit, which comprises the following steps of: establishing a cooperative control framework; establishing a thermodynamic model of the temperature control load, and mapping thermal parameters of the temperature control load into electrical parameters of the virtual motor; establishing a control model based on a virtual asynchronous machine theory; differential multi-dimensional control configuration based on the physical characteristics of the virtual energy storage unit is executed; the virtual asynchronous machine controller selectively filters and shapes the signal, independently calculates slip frequency and generates an active power reference instruction; the power reference instruction is converted into a converter switching signal, and a virtual energy storage unit is driven to execute multi-time-scale collaborative response; and executing a desynchronized adaptive recovery strategy. According to the method, the frequency disturbance rejection capability of the power grid is effectively improved, the complementary characteristics of different types of loads are fully exerted, and the comfort level and the operation economy of a user side are considered.

The invention discloses a staged grouping method and system for a whole wind power plant fault process and electronic equipment, and the method comprises the steps: carrying out the grouping equivalence of a whole wind power plant group based on a slip ratio and an rsc inner ring proportionality coefficient of a rotor-side converter in an unreacted stage of a converter; when at least one fan action enters a crowbar protection Crowbar input-asynchronous machine stage, performing initial classification on a whole fan group based on whether the fan action exists, and performing grouping equivalence based on a slip ratio and an inner ring proportionality coefficient of a rotor side converter on the basis of an initial classification result; and when the Crowbar exits and all the fans return to the rsc control stage, keeping the grouping result until the fault is removed. According to the method, the wind power plant short-circuit current dynamic characteristics in the whole fault process can be accurately described, accurate calculation of the wind power plant short-circuit current is achieved, and technical support is provided for high-proportion new energy power system short-circuit calculation and wind power plant equivalent grouping.

The invention discloses a control method of an energy storage converter based on a virtual asynchronous machine. Comprising the following steps: constructing a virtual asynchronous machine mathematical model framework according to a stator voltage equation, a rotor voltage equation, a flux linkage equation, a torque equation and a motion equation; collecting data, collecting a three-phase voltage instantaneous value of a power grid in real time as stator voltage input data, and receiving a load torque instruction; calculating a stator current vector, wherein the stator current vector is obtained by using the constructed model and the collected data; the working state of the converter is controlled, and the stator current vector serves as an output current instruction to control the electric and regenerative braking state. The established model provides a theoretical basis for control, acquires data to obtain key information matching requirements, provides an accurate instruction basis for calculating a stator current vector, controls the working state of the converter to be flexibly switched, improves the adaptability, energy interaction efficiency and stability of the energy storage converter, and guarantees the stable operation of a power system.

The invention relates to the technical field of pasting equipment for wrapping foam and sheet stock, in particular to a cross asynchronous machine. Comprising a workbench, a film supply device, a laminating device, a sheet material transfer assembly, a film transfer assembly, a finished product transfer device and a material box, the film supply device and the material box are respectively positioned on two opposite sides of the laminating device; the sheet material transferring assembly and the finished product transferring device are located on the two opposite sides of the material box correspondingly. The film transfer assembly transfers an external film provided by the film supply device to the laminating device; the sheet material transferring assembly moves back and forth between the material box and the attaching device, and the finished product transferring device moves back and forth between the attaching device and the material box. The material box comprises a semi-finished product trough and a finished product trough, the material box slides in the length direction of the workbench, the semi-finished product trough is arranged close to the sheet stock transfer assembly, and the finished product transfer device is arranged close to the finished product trough; the production mode of automatic feeding, transferring and attaching is completed, the production efficiency is improved, and the space utilization rate is increased.

A real-time control method for an electro-thermal energy system based on a virtual asynchronous machine, comprising: establishing a dynamic response coupling time-scale model of electric energy and thermal energy for a regional electro-thermal coupled energy system based on different time scales; a virtual asynchronous machine control method based on the dynamic response coupling time-scale model of electric energy and thermal energy, performing real-time power balance control on the electric energy side to improve the frequency dynamic response when the power demand on the DC side changes; based on judging the inertia coefficient of temperature change, adjusting the temperature response on the thermal energy side to achieve real-time control of the electro-thermal energy system. The use of the virtual asynchronous machine control with large-inertia heat and fast-response-speed power in the method of the present invention can achieve real-time power balance, and has the advantages of adapting to load power changes and suppressing frequency oscillations.

Known methods for testing asynchronous motors are based on the fact that the asynchronous motor must be coupled to a load machine or brake in order to record performance characteristics. The invention is a method for testing asynchronous motors without coupling them to a load machine or brake, and for recording their performance characteristics. The method is individually adapted to the specific characteristics of the asynchronous motor being tested. The asynchronous motor is controlled by an inverter at various speeds, both with and without load. During the subsequent acceleration, the absorbed power and speed are recorded. The time period until the target speed is reached is determined. The energy input for acceleration is then calculated by integrating the absorbed power minus the input power. The energy output of the asynchronous motor must then be determined before the efficiency can be finally calculated.

A method and system for establishing an index system for evaluating power grid inertia demand, comprising: obtaining power grid inertia, including synchronous machine inertia, asynchronous machine inertia, voltage source type virtual inertia, current source type virtual inertia and static load voltage equivalent inertia; calculating the minimum value of power grid inertia under the constraint of frequency change rate; calculating the minimum value of power grid inertia under the constraint of frequency deviation; correcting the minimum value of power grid inertia under the constraint of frequency deviation using system energy storage device constraint; taking the maximum value of the two as the minimum inertia of the power grid; calculating the inertia safety domain within the evaluation period T according to the minimum inertia of the power grid; and evaluating the power grid inertia demand based on the inertia safety domain. The present application solves the problem of calculating the minimum inertia value for maintaining stable operation of the power grid under different constraint conditions according to known parameters of the power grid, comparing the calculation results obtained under different constraint conditions, and giving the inertia domain for safe operation of the power grid.

The invention relates to a device for controlling the torque delivered by an asynchronous electric machine, comprising: - a rotary slip-ring collector system adapted to be connected to a rotor of an asynchronous electric machine and configured to collect or supply at least one winding of the rotor of the asynchronous electric machine so as to vary the impedance of the rotor and thus a torque delivered by the asynchronous electric machine; - a variable resistor connected to the rotary slip-ring collector system so as to control the rotary slip-ring collector system; - a processing unit configured to, from a frequency, a supply voltage of the asynchronous machine, a desired torque for the asynchronous electric machine and a corresponding rotor resistance, calculate a value for the variable resistor and thus control the supply voltage of the collector so that the asynchronous electric machine delivers the desired torque.Figure for the abbreviation: FIGURE 1.

The invention relates to a squirrel-cage rotor (7) for driving an asynchronous machine (3) of a rail vehicle (1). The rotor comprises a rotor shaft (11) rotatable about a rotor axis (12), a rotor laminated core (14) connected to the rotor shaft (11) in a rotationally fixed manner and having a plurality of axially extending rotor slots (15), and a shorting cage (17) having shorting bars (18) arranged in the rotor slots (15). According to the invention, the strip cross-section (Q) of the short-circuit strip (18) has a rectangular outer region (QA) and a trapezoidal inner region (QI) connected thereto. Wherein the inner region (QI) is radially closer to the rotor axis (12) than the outer region (QA) and tapers in a radial direction towards the rotor axis (12). As a result, the squirrel-cage rotor (7) is optimized in terms of its electromagnetic properties and in terms of its mechanical strength properties.

The application discloses an asynchronous robot hybrid control method and system based on motor imagery electroencephalogram and electrooculogram, and the system comprises three modules of signal acquisition, signal preprocessing and decoding and robot control. First, the signals of a subject are collected through an electroencephalogram device, including electroencephalogram signals and electrooculogram signals, and the electrooculogram signals are added to enrich the control instruction set of the system. Then, the collected signals are processed, and the processing is divided into two stages: the first stage is signal preprocessing, and the original signals are normalized into the required form; the second stage is signal decoding, including two branches of electroencephalogram signal recognition and electrooculogram signal recognition, and the recognition results are converted into robot control commands. Finally, the robot device obtains the recognition results of the signals through a wireless data receiving module, and then converts the recognition results into control commands to control the robot to make corresponding actions, and the feedback of the robot actions is used to guide the issuance of the next command, so that the comfort of human-computer interaction is improved.

The application discloses a unified equivalent magnetic circuit analysis and calculation method for transformers and asynchronous motors based on magnetic induction, and belongs to the field of motors and transformers. In the method, the equivalent magnetic circuits of the transformers and the asynchronous motors are composed of magnetic resistance, core loss equivalent magnetic induction and secondary phase winding (rotor squirrel cage winding in the asynchronous motor) equivalent magnetic induction. The application can intuitively and effectively reflect the fact that the primary and secondary phase windings of the transformers and the asynchronous motors are connected in the circuit insulation and the magnetic circuit, can clearly qualitatively and quantitatively represent the influence of the core loss equivalent magnetic induction of the transformers and the asynchronous motors on the magnetic flux and the phase difference, can directly calculate the parameter variables, and can draw the transformer and asynchronous motor phasor diagram based on the vector equivalent magnetic circuit.

The application relates to the technical field of electric power automation, in particular to an asynchronous control method and device of a multi-modal power system and a storage medium, wherein the method comprises the following steps: a discrete-time hidden semi-Markov jump system of the multi-modal power system is established; a mode transition probability depending on a residence time is designed according to the discrete-time hidden semi-Markov jump system; a transmission probability of an observation mode is determined according to the designed mode transition probability; a deception attack model is established according to the influence of the multi-modal power system under a deception attack; an observation mode-dependent asynchronous controller is designed based on the discrete-time hidden semi-Markov jump system and the deception attack model; and asynchronous controller parameters are determined according to the designed observation mode-dependent asynchronous controller. The method establishes a dynamic model of the multi-modal power system under an asynchronous mechanism, designs an asynchronous control strategy of the power system, and guarantees the stability of the power system.

The invention discloses an electric heating energy system real-time control method based on a virtual asynchronous machine. The method comprises the following steps: establishing an electric energy and heat energy dynamic response coupling time scale model of a regional electric heating coupling energy system based on different time scales; the invention discloses a virtual asynchronous machine control method based on an electric energy and heat energy dynamic response coupling time scale model, and the method carries out the real-time power balance control of an electric energy side, and improves the frequency dynamic response when the power demand of a DC side changes. And on the basis of judgment on the inertia coefficient of temperature change, the temperature response of the heat energy side is adjusted, and real-time control over the electric heating energy system is achieved. According to the method, real-time power balance can be achieved through virtual asynchronous machine control using large inertia heat and fast response speed electric power, and the method has the advantages of adapting to load power changes and restraining frequency oscillation.

This invention relates to the technical field of bonding equipment for wrapped foam and sheet materials, and particularly to a cross-type asynchronous machine; it includes a worktable, a film supply device, a bonding device, a sheet material transfer assembly, a film transfer assembly, a finished product transfer device, and a material bin; the film supply device and the material bin are located on opposite sides of the bonding device; the sheet material transfer assembly and the finished product transfer device are located on opposite sides of the material bin; the film transfer assembly transfers the external film provided by the film supply device to the bonding device; the sheet material transfer assembly reciprocates between the material bin and the bonding device, and the finished product transfer device reciprocates between the bonding device and the material bin; the material bin includes a semi-finished product trough and a finished product trough, the material bin slides along the length of the worktable, the semi-finished product trough is located near the sheet material transfer assembly, and the finished product transfer device is located near the finished product trough; it completes an automatic feeding, transfer, and bonding production mode, improving production efficiency and space utilization.