773 results about "Electromotive force" patented technology

The invention discloses a humanoid robot joint motor control method with model prediction control, and relates to the technical field of robot motion control. The method is used for solving the problems of control instruction infeasibility and model disturbance caused by voltage saturation during high-speed motion. An error state space model of a joint motor system is established, and non-linear terms such as gravity are used as nominal feed-forward quantities for stripping; then, the rotating speed of the motor and the bus voltage of the driver are collected in real time, the back electromotive force is calculated, and the voltage margin is mapped into a dynamic torque physical limit value at the current moment; and meanwhile, estimating an unmodeled lumped disturbance value of the model by using an extended state observer. And finally, taking the dynamic limit as a real-time inequality constraint, introducing a disturbance value correction prediction equation, constructing and solving a quadratic programming problem, extracting an optimal compensation torque, superposing the optimal compensation torque with an inverse dynamic feedforward torque, and converting the superposed torque into a current signal to drive a motor, thereby realizing high-dynamic and high-precision robust control under the physical boundary constraint.

The invention discloses a pumping unit disc type permanent magnet motor multi-objective parameter optimization method, which relates to the technical field of motor design and optimization, and comprises the following steps: pre-establishing a multi-physical field coupling simulation model, constructing a disc type permanent magnet motor electromagnetic and thermal performance simulation model based on Motor-CAD and Maxwell software, and completing no-load, load and thermal performance tests of the motor. According to the method, the multi-physical field coupling simulation model is established in advance, so that comprehensive coupling analysis of electromagnetic and thermal performance of the disc type permanent magnet motor is realized, and high-precision data support is provided for multi-objective optimization; key structure parameters such as air gap length, slot opening width and the like are scientifically selected as optimization objects, maximization of motor efficiency and minimization of cogging torque are taken as core targets, and meanwhile, constraint requirements of output torque, back electromotive force and structure size are strictly adherent to each other, so that the pain point that multiple performances are difficult to consider at the same time in traditional optimization is effectively solved.

The invention discloses a dual three-phase permanent magnet synchronous motor harmonic suppression method based on virtual back electromotive force identification, and the method comprises the following steps: S1, building a driving system model of a DTP-PMSM; s2, constructing a harmonic model of the DTP-PMSM, analytically decomposing the nonlinear characteristic and the non-sinusoidal counter electromotive force of the inverter into dq and dqz subspaces, introducing the concept of virtual harmonic counter electromotive force, and unifying the nonlinearity of the inverter, the space harmonic counter electromotive force and cross coupling terms related to harmonic current into a single expression form; and S3, developing an identification principle based on current mapping, including amplitude and phase estimation, gain design and delay compensation, so as to estimate the amplitude and phase deviation of the virtual harmonic back electromotive force on line to realize harmonic suppression and avoid a complex algorithm and a large amount of parameter adjustment. According to the method, the operation effect is good in a wide rotating speed range, and meanwhile complex algorithms and a large amount of parameter adjustment are avoided.

The present invention relates to a flexible thermoelectric device that may be combined and attached to a curved surface and generates an electromotive force based on a temperature difference between one surface and the other surface, and more particularly, to a flexible thermoelectric device having a radiative cooling part which improves power generation performance by increasing cooling efficiency of a cooling side through radiative cooling and minimizes a volume of a heat dissipating part, and a method of manufacturing a radiative cooling part.

The invention discloses an SMO-EKF brushless direct current motor position-free control method based on SBA-GWO double-layer optimization, SMO adopts sliding mode surface gradient-rotating speed double-factor segmented gain, and an improved SBA-GWO algorithm is combined with a global exploration mechanism of a stingless bee algorithm and a group cooperation characteristic of a grey wolf optimization algorithm. An elite initialization strategy and a dynamic search mode switching mechanism based on a grey wolf level are introduced, and an SBA-GWO algorithm is adopted for parameter optimization: in the first layer, SMO counter electromotive force THD is taken as fitness, and optimal gain is searched; in the second layer, the EKF estimation error quadratic sum is used as the fitness, and the Q / R adaptive residual noise time-varying property is optimized. And constructing an SMO-EKF cooperative control closed loop according to the optimized parameters to realize brushless direct current motor position-free control. Compared with the prior art, in the BLDC full-rotating-speed-domain position-free control, the dynamic response speed and the steady-state buffeting suppression effect are both considered, the robustness and the engineering realizability are remarkably improved, a physical sensor is not needed, and the engineering cost is low.

The invention discloses a brushless motor rotor angle determination method and device, equipment and a storage medium. The method comprises the following steps: synchronously acquiring original angle data of a Hall sensor, an incremental encoder and a back electromotive force observation module; respectively determining confidence coefficients of the Hall sensor, the incremental encoder and the back electromotive force observation module according to the rotating speed of the rotor, and performing weighted fusion on the original angle data of the Hall sensor, the incremental encoder and the back electromotive force observation module to obtain an initial fusion angle; based on the motor temperature, the motor phase current and the rotor speed, calculating a temperature drift compensation angle through a segmented temperature drift coupling model, and compensating the initial fusion angle according to the temperature drift compensation angle to obtain a temperature drift compensated angle; and inputting the temperature drift compensated angle into an extended Kalman filter for state estimation and filtering to obtain a rotor angle estimation value at the current moment. By means of the method, high-precision real-time calculation of the rotor angle within the wide temperature range and the full rotating speed range can be achieved.

The invention discloses a quantitative test method and system for a peak locked-rotor torque of a robot joint module, and relates to the technical field of robot joint performance evaluation, and the method comprises the steps: extracting a torque time-calendar curve of the joint module, defining the peak locked-rotor torque as a controlled low-frequency fatigue loading process, and building a mapping model of a torque amplitude and a failure cycle index; constructing a test system, and performing torque-current static calibration; embedding a specific excitation function in a current loop of the servo driver; the bus voltage and rotating speed change rate is monitored in real time, and the voltage and current impact at the unloading moment is inhibited by adopting a back electromotive force compensation algorithm and combining an energy consumption discharge loop; and repeatedly loading until the structure is damaged, recording the number of cycles, and drawing a peak torque-life curve as a basis for predicting the life of the whole machine. According to the method, quantitative association of the peak locked-rotor torque and the fatigue life is realized, quantitative evaluation from a static index to a dynamic life is realized, a basis is provided for life prediction of the whole robot, and the test precision is improved.

The application relates to the technical field of motor control, and discloses a low-voltage motor based on segmented threshold PWM control, which comprises a motor shell, a motor tail cover arranged at the tail of the motor shell, a control circuit board arranged at the middle of the motor tail cover, a device assembly arranged on the surface of the control circuit board, wherein the device assembly comprises a microcontroller arranged on the surface of the control circuit board, the microcontroller is internally provided with a control system, and the device assembly further comprises a PWM signal input unit, a power input and filtering unit, a voltage reduction and stabilization unit, a reverse electromotive force and voltage sampling unit, a motor power driving unit, a current sampling unit and a temperature detection unit arranged on the surface of the control circuit board. The application utilizes segmented threshold control, closed-loop speed regulation architecture and dynamic threshold reconstruction logic to realize shielding of instruction jitter and accurate speed regulation, and the current determination boundary is reconstructed in real time through the speed deviation and the running state, so that the transient response capability of the motor and the hardware safety and reliability under all working conditions are considered.

The invention discloses a hybrid magnetic barrier design method for improving the average torque of a permanent magnet generator, the motor type is a double permanent magnet vernier motor, a stator and a rotor are provided with permanent magnets, the stator is wound with an armature winding, and an air gap magnetic field is composed of a stator permanent magnet magnetic field, a rotor permanent magnet magnetic field and an armature magnetic field. The average torque is derived from the interaction of an armature magnetic field and stator and rotor permanent magnetic fields. The stator is composed of six E-shaped module units in space, non-air-gap magnetic barriers exist between the module units, air-gap magnetic barriers are added to the two sides of a permanent magnet of the stator and the two sides of a permanent magnet of the rotor respectively, and the average torque is improved by improving the working wave content of an armature magnetic field and the working wave content of a permanent magnet magnetic field through the two types of magnetic barrier structures respectively. The hybrid magnetic barrier is simple in structure, the average torque of the permanent magnet vernier motor can be improved by more than 30%, and meanwhile, the sine property of no-load back electromotive force is improved.

The application belongs to the technical field of low-voltage direct-current microgrid, and discloses a kind of overvoltage suppression system and method for solid-state protection of direct-current microgrid converter, which constructs a kind of system for inhibiting overvoltage of converter by connecting energy absorption path on solid-state switch device.When protection action triggers SSSD to shut down, the huge induced electromotive force generated by filter inductance due to sudden change of current path can drive current to divert to the parallel energy absorption path.Using the system eliminates the risk of high voltage breakdown of power devices caused by the release of electric energy in the original scheme, ensures that the protection action itself will not cause secondary voltage damage to the converter, while retaining the core protection capability of SSSD to quickly cut off fault current, thereby significantly improving the reliability and engineering practical value of the solid-state protection scheme.

Light-emitting device comprising: a substrate; a first light-emitting element that emits a first light and is mounted on the substrate; a second light-emitting element that emits a second light and is mounted at a position on the substrate where the second light-emitting element can receive the first light, wherein the second light has an emission peak wavelength that is longer than an emission peak wavelength of the first light; and a control and / or regulating device that separately controls and / or regulates the first light-emitting element and the second light-emitting element, wherein the control and / or regulating device controls and / or regulates a current to be supplied to the second light-emitting element on the basis of an electromotive force generated by the second light-emitting element, which receives the first light, the control and / or regulating device includes: a measuring device that measures a voltage value of the electromotive force generated by the second light-emitting element; a memory that stores a relationship between the voltage value of the electromotive force and a current value of the second light-emitting element; a determining device that determines the current value corresponding to the voltage value measured by the measuring device, based on the voltage value and the relationship stored in the memory; and an adjusting device that adjusts the current to be supplied to the second light-emitting element so that the current has the current value determined by the determining device.

Conventional saponius-type wind turbines are large because the generator is connected to the lower part of the turbine's rotating shaft; the goal is to make them more compact. Furthermore, it prevents rainwater, snow, or fallen leaves from accumulating in various parts of the wind turbine. A small, lightweight wind turbine and wind power generation device that can generate stable torque and electromotive force even when wind direction and speed change rapidly, and can utilize wind from all directions, including horizontal, vertical, and oblique directions, to generate rotational torque. [Solution] A vertical-axis wind turbine comprising a bucket having a roughly hemispherical paddle section at the top and a semi-cylindrical bucket section at the body, arranged horizontally offset along the plane of a cylinder cut in half vertically, such that wind flowing into the concave side of one bucket flows into the concave side of the other bucket, and a wind power generation device equipped with a generator inside the bucket.

The application provides a motor dynamic control method, device, equipment and vehicle, which can determine different induced electromotive force voltages according to different operation parameters of a target motor, determine a maximum value of the induced electromotive force voltage allowed to appear in the current relay state, and further determine the maximum allowed speed of the target motor. Since the induced electromotive force voltage is constantly changing, the maximum allowed speed is also changing. The switching of the protection mode is performed according to the maximum allowed speed, the dynamic switching is realized, the safety of the motor is ensured, the maximum allowed speed corresponds to a higher vehicle speed, and the normal driving of the vehicle is not affected by limiting the vehicle speed according to the maximum allowed speed.

The utility model provides a lightning protection filter circuit, a lightning protection filter system and electronic equipment. The lightning protection filter circuit comprises a first power line, a second power line and at least one lightning protection device, a first inductor is arranged on the first power line; the at least one lightning protection device comprises a first lightning protection device, one end of the first lightning protection device is connected with the first power line, and the other end is connected with the second power line; the first power line is provided with a first input end for inputting lightning signals, and one end of the first lightning protection device is connected between the first input end and the first inductor; according to the invention, the first lightning protection device can discharge current and clamp voltage in a protection voltage interval; however, since the first lightning protection device has a certain starting time, when a lightning signal invades from the first input end, the first inductor can generate a directional electromotive force and hinder current from passing, so that a certain lightning protection effect is achieved within the starting time of the first lightning protection device, and the lightning protection effect of the lightning protection filter circuit is improved.

The application relates to the technical field of function test, and discloses a stress measurement system for spring fatigue state, which comprises an excitation unit, a sensing unit and a signal processing unit. The excitation unit applies an alternating excitation magnetic field to the spring to generate a stress-modulated induced electromotive force signal. The sensing unit collects magnetic characteristic parameters by using a quadrature differential sensing structure. The signal processing unit obtains phase components in a tangential signal and a radial reference signal, calculates a dynamic spiral angle deflection based on a phase difference, determines a dynamic differential compensation coefficient to extract a tangential principal stress component and compensate for a magnetic flux leakage vector deviation. Through a space posture modulation and lift gap fluctuation suppression mechanism, the application realizes dynamic alignment of a sensor measurement main shaft and a spring stress tensor main shaft, effectively eliminates geometric deflection errors caused by large amplitude deformation, and ensures that the system has high signal-to-noise ratio and baseline stability under cyclic load.

DEPCT65 Variable electromagnetic compensation devices for protecting wind tower blades or similar structures. Mobile or other static type consisting of: two conductive adapters for connection (1,2) charging One (1) of the device's connections to the external collector of the component shall be protected on the side. One and the other (2) of connection with the world in another way and two components of high reaction to The flow of high-frequency current and the energy absorber in the form of heat (3,4) connected on both sides of the body. Reflecting the frequency consisting of a dielectric insulator (9) placed between the first and second conductor components (7, 8) and in sequence to two adapters (1,2) causing an electromotive force to be applied to the high frequency current path. Start by reducing the frequency and absorbing a portion of the energy generated from the heat. -----------------------------------------------------------

The application provides a motor closed-loop switching method and device, electronic equipment and a storage medium. The method comprises the following steps: detecting a zero-crossing point signal of a motor back electromotive force signal; judging whether an interference signal exists in the zero-crossing point signal; if it is identified that the interference signal exists, performing closed-loop switching according to a target switching strategy; and if it is identified that the interference signal does not exist, directly taking a first preset rotating speed as an initial speed after the motor is switched to a closed-loop running stage. The application can perform anti-interference processing after detecting the interference signal, avoid the influence of the interference signal on the detection result of the zero-crossing point signal, and further weaken the influence of the interference signal on the closed-loop switching operation, so that the switching in the closed-loop stage of the motor is more reliable, and in particular, the reliability of the motor starting in a strong magnetic field environment is enhanced.

The invention discloses a magnetic coupling surge protection device based on an amorphous ferrite material, which comprises an amorphous ferrite magnetic core, a secondary side inductor, a secondary side resistor, a bias conductor and a bias power supply, is nested outside a high-voltage direct-current transmission line, and forms magnetic field coupling with the high-voltage direct-current transmission line through the amorphous ferrite magnetic core in the device. When suddenly changed surge current flows through the device, a rapidly changing magnetic field is excited in the amorphous ferrite material, the magnetic field provides equivalent inductance for the high-voltage direct-current transmission line, and meanwhile, the rapidly changing magnetic field generates induced electromotive force in the bias conductor and generates induced current; the induced current generates heat loss in the process of flowing through the secondary side resistor, and surge current energy in the high-voltage direct-current transmission line is converted into the heat loss of the secondary side resistor through the process, so that surge protection is realized. The invention has the advantages of high saturation magnetic flux density, high relative permeability, excellent high-frequency performance and the like, and is suitable for the operation condition of magnetic coupling surge protection equipment.

The invention relates to an asymmetric fault ride-through control method and system based on a three-phase four-leg virtual synchronous generator, and belongs to the technical field of power electronics and new energy power generation. The invention provides a solution for solving the problems of asymmetric output current, transient overcurrent, weakening of system supporting capability and the like under the asymmetric fault of a power grid in the prior art. The method comprises the following steps: detecting an asymmetric fault of a power grid; freezing a reactive power ring and retaining an active power ring when a fault occurs; determining a voltage drop coefficient and a phase jump angle according to the fault type; directly calculating a three-phase asymmetric excitation electromotive force reference value based on a system phasor geometrical relationship and a current amplitude limiting constraint; and giving the reference value to a voltage loop, and controlling the output of the inverter.

The invention relates to the technical field of motor resonant frequency detection, in particular to a motor resonant frequency detection method and device, a chip and electronic equipment. Using the offset data to calibrate the anti-induced electromotive force signal of the motor to obtain a first anti-induced electromotive force signal, and obtaining the resonant frequency of the motor according to the detection result of the first anti-induced electromotive force signal; through the mode, the influence of the imbalance data of the anti-induced electromotive force signal on the detection of the resonant frequency is eliminated, and the detection accuracy of the motor resonant frequency is improved.

The invention relates to an aircraft system for suppressing movement of a structural flight element. The aircraft system includes a movable aircraft structure, a power source, a controller, a resistor, and a first transistor connected in series to the resistor. When the power source of the aircraft provides power, the controller controls the first transistor to prevent current from flowing through a terminal of the first transistor and through the resistor. Further, when the power supply of the aircraft does not provide power, the first transistor allows a current generated by a back electromotive force (EMF) voltage generated by movement of the movable aircraft structure to flow through a terminal of the first transistor and through the resistor.

The invention discloses an intelligent control method and system for a clock micromotor, and relates to the technical field of intelligent control, and the method comprises the steps: obtaining the environment temperature, the gravity angle value and the standing time of the clock micromotor, taking the environment temperature, the gravity angle value and the standing time as orthogonal variables, constructing a multi-dimensional friction load tree, and according to the multi-dimensional friction load tree, carrying out the intelligent control of the clock micromotor. The method comprises the following steps: obtaining a reference driving pulse width, calculating a time difference value between an actual back electromotive force zero-crossing moment and a theoretical back electromotive force zero-crossing moment, outputting the time difference value as a load residual error, storing the load residual error according to a time sequence to form a historical load residual error sequence, and obtaining a trend correction factor according to the historical load residual error sequence; compensating the reference driving pulse width through the trend correction factor, generating a target driving pulse width, outputting a driving waveform to a coil of a clock micromotor according to the target driving pulse width, controlling the operation of a rotor, updating a historical load residual error sequence according to a real-time load residual error, and improving the travel time precision, battery endurance and mechanical life of the clock.

The application provides a low-noise motor optimization method based on multi-parameter variable fusion, and the specific process is as follows: taking motor back electromotive force variation and minimum slot torque as an optimization objective function; taking motor rotor magnetic pole circular arc wrap angle as an optimization variable, and multiple iterations of the magnetic pole circular arc wrap angle are carried out in a set range, the magnetic pole circular arc wrap angle corresponding to the minimum objective function is taken as an optimal parameter of the motor, and low-noise motor optimization is realized; the magnetic pole circular arc wrap angle is proportional to the magnetic pole circular arc length. In the method, the magnetic pole circular arc wrap angle is taken as an optimization object, and the optimization design can be quickly and effectively completed, and the low-noise motor for vehicles can be developed.

This application discloses a method, apparatus, storage medium, and product for controlling the current of a charge-and-discharge power supply. The method includes acquiring a target adjustment command, which includes a target current increment. This target current increment is the difference between a first preset current and a second preset current. The first preset current is the target current of the previous adjustment cycle, and the second preset current is the target current of the current adjustment cycle. The method also includes acquiring a voltage increment based on multiple target parameters and the target current increment. These multiple target parameters include the battery electromotive force, battery internal resistance, and line impedance of the charge-and-discharge power supply when it was in a stable state in the previous adjustment cycle. Finally, the method includes acquiring an adjustment amount based on the voltage increment and adjusting the output current of the charge-and-discharge power supply based on the adjustment amount. This method can improve the response speed while ensuring the stability of the output current of the charge-and-discharge power supply.

The application discloses an electromagnetic track launcher electrical load simulation system, comprising: in series, a moving coil impedance model, a track inductance model, a track resistance model, a pivot track contact resistance model, an armature inductance model and an armature resistance model; the moving coil impedance model outputs the launching load displacement and the pivot track contact pressure based on the series loop current of the system; the moving coil impedance model also obtains the moving coil electromotive force based on the launching load speed, the series loop current and the track inductance gradient, and feeds back to the series loop of the simulation system; the track inductance model adjusts the series loop current of the simulation system based on the launching load displacement; the track resistance model obtains the track resistance voltage drop based on the launching load displacement and feeds back to the series loop of the simulation system; the pivot track contact resistance model obtains the contact resistance voltage drop between the track and the armature based on the pivot track contact pressure and feeds back to the series loop of the simulation system. The application can accurately simulate the dynamic coupling process of the electromagnetic track launcher.

The application discloses a variable-frequency-power-frequency automatic switching energy-saving system and method, and belongs to the technical field of motor control, which comprises the following steps: in the variable-frequency starting stage, a motor is driven to run at variable speed by a frequency converter; when the motor reaches full frequency, high power and stable operation, a control device controls the output voltage of the frequency converter to be synchronous with the grid voltage, and the switching to the power-frequency grid is completed when the phases are consistent; when the load decreases and needs to be reduced, the control device starts the frequency converter to make the output voltage of the frequency converter synchronous with the counter electromotive force of the motor in the power-frequency operation, then performs a back switching operation, the motor in rotation is smoothly connected by the frequency converter, and speed reduction control is implemented, and finally the variable-frequency speed regulation operation state is returned; the application realizes automatic selection of the optimal operation mode according to the actual load, avoids energy loss of the frequency converter in the high-speed area, and ensures that the impact on the motor and the grid in the switching process is minimum.

The invention discloses an oxygen concentration sensor coupled with temperature detection, and belongs to the technical field of oxygen concentration sensing, a temperature sensing module and a first signal quick connector form a temperature measuring unit, and the temperature sensing module is used for sensing a temperature signal when the temperature sensing module is immersed in liquid lead bismuth alloy; and temperature data are transmitted through the first signal quick connector. A Pt electrode, a positive electrode lead, a negative electrode connecting wire and a second signal quick connector form an electromotive force measuring unit which is used for sensing oxygen partial pressure difference between the liquid lead-bismuth alloy and a reference electrode when the YSZ ceramic tube is immersed in the liquid lead-bismuth alloy and transmitting electromotive force data through the second signal quick connector; and the measured temperature data and electromotive force data are synchronized, and the oxygen concentration is obtained through a Nernst equation.

The utility model provides a temperature difference change generator, which comprises a main body and a water inlet II, the right side of the upper end of the main body is provided with a water inlet I and a water inlet II, the water inlet I and the water inlet II have the same specification, and the outer side of the main body is provided with a group of frames for limiting the position of the main body. Compared with the prior art, the thermoelectric power generation device has the advantages that external water is led into the thermocouple and the condenser through the first water inlet and the second water inlet respectively, the two sets of water are heated and cooled, the temperature of the two sets of water is lowered, and the temperature of the two sets of water is lowered. The cold water is guided into the cold and hot temperature difference box I and the cold and hot temperature difference box II through a hot flow guide pipe and a cold water guide pipe, and temperature difference changes are generated in the cold and hot temperature difference box I and the cold and hot temperature difference box II, so that thermoelectric generators in the cold and hot temperature difference box I and the cold and hot temperature difference box II generate thermoelectric electromotive force of semiconductors and generate power; compared with single cold and hot temperature difference box power generation, power generation efficiency and power generation capacity can be effectively improved.

The invention discloses a control method and system for suppressing broadband oscillation of an energy storage system. According to the method, a self-adaptive control branch based on the phase locking principle is introduced into a current control loop of the energy storage converter, the oscillation frequency in a power grid is identified in real time, and a corresponding additional internal electromotive force signal is generated and superposed into an original control signal, so that the equivalent impedance characteristic of the energy storage converter is dynamically optimized, and the energy storage converter is optimized. And effective damping of broadband oscillation is realized. The method can adaptively track the changing oscillation frequency, does not need to modify the structure of a main circuit, can significantly enhance the system damping, effectively inhibits the broadband oscillation in a power electronic power grid, improves the stability of the power grid through the upgrade of a control algorithm, and has the advantages of low cost, easy integration and high adaptability.

The invention relates to the technical field of electromagnetic flow meters, in particular to an online calibration method and system for an electromagnetic flow meter and the electromagnetic flow meter. The online calibration method analyzes an error source of baseline drift on the basis of the basic principle of the electromagnetic flow meter, establishes an error estimation function, and determines the error estimation function when the flow is stable. Various coefficients of an error estimation function are adjusted by continuously using newly obtained baseline offset, excitation coil resistance and electrode liquid connection resistance, so that the error estimation function can track the state change of the electromagnetic flowmeter, online calibration is carried out on the electromagnetic flowmeter by utilizing each flow stabilization period, and the error estimation precision is continuously improved. After an estimation error is calculated through the error estimation function optimized through the steps, the measured induced electromotive force can be corrected, baseline drift is eliminated, and therefore on the premise that the normal measurement process of the electromagnetic flowmeter is not interrupted, key parameters such as baseline offset can be calibrated through a gap with stable flow.