39 results about "Field orientation" patented technology

The invention relates to a method and an electronic device for the indirect field-oriented control (FOC) of a brushless DC motor (1) using digital Hall sensors (3a-3c) for detecting the instantaneous rotor position of the DC motor (1) for the purpose of torque control, wherein an electrical revolution of the rotor (2) by a plurality (n) of digital Hall sensors (3a-3c) arranged equidistantly to one another in relation to the rotor circumference is divided into twice (2n) as many sectors, wherein each sector corresponds to a defined Hall pattern and a change in the Hall signal is interpreted as an exceeding of the limit of a sector caused by the rotation of the rotor (2) in order to apply an incrementally constant rotor angle (α) for determining the instantaneous rotor position for the field-oriented control.

The invention belongs to the technical field of grinding materials and grinding tools, and particularly relates to a diamond electroplated grinding wheel directionally arranged in a magnetic field and a preparation method and application thereof. Firstly, electroplating liquid is added into an electroplating bath, then 30%-40% of magnetic diamond abrasive materials are added into the electroplating liquid, directional magnetic sanding is carried out with the grinding wheel base body A as a cathode and a nickel plate as an anode, the magnetic field intensity is controlled to be 0.1-1 T, the cathode current density is controlled to be 0.4 A / dm < 2 >-0.6 A / dm < 2 >, the electroplating time is 10-20 min, and a grinding wheel base body B is obtained; removing floating sand from the grinding wheel base body B to obtain a grinding wheel base body C; and the grinding wheel base body C is thickened to obtain a grinding wheel base body D, and the grinding wheel base body D is modified to obtain the grinding wheel. The grinding rate of the manufactured grinding wheel is reduced by 10%-25%, the service life is prolonged by 30%-50%, the machined surface roughness (Ra) can reach 0.3 micrometer or below, and the machined surface precision is reduced by 10%-25%. The grinding wheel is applied to nanoscale grinding of optical glass, sapphire and silicon carbide wafers and forming machining of turbine blade mortises and ceramic matrix composites, and the precision and roughness of the grinding wheel can be effectively guaranteed.

The invention relates to a high-thermal-conductivity all-carbon-series heat-conducting gasket and a preparation method and application thereof, in particular to a high-thermal-conductivity all-carbon-series heat-conducting gasket based on a shearing force field and low magnetic field double-field orientation technology and a preparation method thereof, belongs to the technical field of preparation of electronic functional materials, and is mainly used for thermal management of high-power electronic components such as chips, LEDs and 5G equipment. The high-thermal-conductivity all-carbon-series heat-conducting gasket comprises the following raw materials in parts by weight: 100 parts of organic silica gel, 200-500 parts of pitch-based carbon fibers, 80-230 parts of spherical heat-conducting filler and 300-700 parts of a diluent, and the all-carbon-series heat-conducting gasket is oriented in the direction of a magnetic field by utilizing the synergistic effect of a shear force field and the magnetic field. The process has the characteristics of high production efficiency, low cost and easiness in industrial production, and can ensure that a highly-oriented and tightly-arranged heat-conducting network structure is formed in the composite material. The technical breakthrough is of great significance in promoting the practical application of the high-performance thermal interface material.

The invention discloses a resistance detection method and device and electronic equipment, the resistance detection method can be applied to a field-oriented control circuit, the field-oriented control circuit comprises a second component and a motor which are sequentially connected in series, and the second component is used for inputting three-phase current to the motor; one-phase input circuits and one-phase output circuits of the second components are in one-to-one correspondence; the method comprises the following steps: applying a first direct-current voltage to a one-phase input circuit to obtain first voltage data and first current data which respectively indicate direct-current components of the one-phase input circuit and a one-phase output circuit; applying a second DC voltage to the one-phase input circuit to obtain second voltage data and second current data which respectively indicate DC components of the one-phase input circuit and the one-phase output circuit; and determining the resistance of the motor based on the first and second voltage data and the first and second current data. According to the invention, the online detection of the motor resistance is realized, and the influence of inaccurate resistance data on the starting speed of the motor is avoided.

The utility model relates to the technical field of new energy automobile control, and provides a new energy automobile air conditioner compressor controller which comprises a main control unit, and the main control unit is in signal connection with a magnetic field orientation control unit and a detection unit. The detection unit outputs a detection signal to the main control unit, the magnetic field orientation control unit receives an instruction of the main control unit and generates a PWM driving signal by decoupling a motor magnetic field and torque based on the instruction, and the main control unit generates a control instruction based on the PWM driving signal and outputs the control instruction to a compressor motor. According to the application, the purposes of improving the response precision and speed and providing better experience for the user are achieved.

A method (100) for calibrating the offset angle (PhiO) of a field orientation regulator of a motor (210) between the angle signal (W) of a position sensor (220) and the direction of the rotor flux (RF), comprising the steps of: periodically changing (120) a current vector (Is) along a constant torque line; determining (130) a rotational speed signal (n_t) of the position sensor (220) of the motor (210); and calibrating (140) the offset angle (PhiO) based on the determined rotational speed signal (n_t).

A method of controlling an electric motor and a packaged semiconductor product. One example is a method of controlling an electric motor, the method including: calculating, by a motor controller, a setpoint Q-D signal based on a setpoint speed signal, the setpoint Q-D signal representing a setpoint position of a magnetic field relative to a rotor of the electric motor; serially transmitting, by the motor controller, the setpoint Q-D signal to a field orientation controller, the field orientation controller disposed within a different package than the motor controller; converting, by the field orientation controller, the setpoint Q-D signal to a setpoint [alpha]-[beta] signal representing a setpoint position of the magnetic field relative to a stator of the electric motor; converting, by the field-oriented controller, the setpoint alpha-beta signal into a setpoint voltage signal; and gate-controlling, by the field-oriented controller, an inverter based on the setpoint voltage signal.

The utility model discloses a mining explosion-proof type three-phase permanent magnet synchronous electric roller driving device which comprises a working table, a three-phase permanent magnet synchronous motor is installed at the upper end of the working table, a protection mechanism is installed on the working table, and an explosion-proof mechanism is installed on the working table. The protection mechanism comprises a protection shell, an air guide channel, a ventilation opening and an air extractor. The explosion-proof mechanism comprises a lifting plate, an air outlet hole, a limiting frame and a lifting piston. The utility model has the beneficial effects that the three-phase permanent magnet synchronous motor adopted by the device adopts an advanced magnetic field directional control technology, so that the loss in the energy conversion process is reduced, the speed is accurately regulated, the overall efficiency is improved, and when the inside of the protective shell explodes, the lifting piston can be pushed downwards through pressure, so that the explosion is prevented. And then under the action of the limiting frame, the lifting plate can move downwards and block the ventilation opening, then destructive power generated by explosion can be prevented from influencing the outside, and potential safety hazards are reduced.

The invention relates to a motor track module for realizing straight line and turning functions, which is provided with a driving device so as to control the output torque of a permanent magnet synchronous motor through a field orientation control algorithm when a loading vehicle moves on a straight track. When the loading vehicle moves on the curved rail, the output torque of the permanent magnet synchronous motor is dynamically adjusted by using the rail parameters of the curved rail and the characteristic information, collected in real time, of the loading vehicle and the cargos carried by the loading vehicle through a fusion algorithm of path planning and proportional-integral control, and then turning is dynamically adjusted according to the load and the rail parameters through a hybrid algorithm; according to the motor track module, energy waste can be reduced, the system operation efficiency can be improved, then the motor track module can adapt to complex operation environments, meanwhile, the problems of power mismatching and instability in the prior art can be effectively solved under different load and track conditions, and then the technical effect of improving and optimizing the turning performance of the motor track module is achieved.

The utility model relates to the technical field of electric field orientation of carbon nanotubes, and discloses a carbon nanotube electric field orientation device which comprises an electrode plate I. The outer wall of the electrode plate I is fixedly connected with a plurality of mounting blocks, the lower surface of the electrode plate I is fixedly connected with an interface I, and the upper surface of the electrode plate I is fixedly connected with an anti-skid pad. A culture dish is arranged on the upper surface of the non-slip mat, an electrode plate II is arranged right above the culture dish, an interface II is fixedly connected to the upper surface of the electrode plate II, a limiting assembly is mounted on the upper surface of the electrode plate I, and an adjusting assembly is mounted on the outer wall of the electrode plate II. According to the utility model, a culture dish containing a carbon nanotube solution is placed on the non-slip mat, the screw rod is rotated to drive the threaded sleeve to drive the electrode plate II to lift, and the solution is oriented by electrifying the interface I and the interface II. The height of the second electrode plate can be rapidly adjusted by observing scale marks through the magnifying lens, the first spring is matched with the anti-skid pad through the counter-acting force, the culture dish is limited and prevented from shaking, and the practicability of the device is improved.

The application relates to the technical field of servo motor control, and provides an initial electric angle self-calibration method, device and storage medium for servo motor control. The method comprises the following steps: a controller controls a power circuit to inject a preset direct-current excitation current into a winding of a servo motor, so as to generate a fixed-direction stator resultant magnetic field, and a rotor permanent magnet is dragged and aligned to the fixed-direction stator resultant magnetic field; after judging that the rotor is aligned stably, an aligned mechanical angle output by a magneto-electric encoder is read; an electric angle offset between an installation zero point of the magneto-electric encoder and an electric zero point of the servo motor is calculated and obtained; the electric angle offset is stored in a nonvolatile memory as a control parameter, and initial electric angle self-calibration is completed; after the self-calibration control flow is completed, real-time electric angles used for performing magnetic field orientation control are solved in real time based on the electric angle offset stored in the nonvolatile memory; and the controller performs magnetic field orientation control on the servo motor based on the real-time electric angles.

A magnetic array for use in a synchronous electrical machine or a magnetic gear box, comprising a plurality of discrete magnetic segments. When individual ones of the segments are spaced away from influence of ferromagnetic material, such as prior to placement in the array, each includes a pole having the same maximum field strength. Each segment is positioned in a sequence along a circumferential array with changes in field orientation by which the field of each segment is spatially rotated relative to the field of a next segment in the sequence. Each segment is positioned in sufficient proximity to the next segment in the sequence to enable the fields to interact with one another and effect flux channeling.

A blood pump system includes a blood pump and a corresponding controller. The blood pump includes an impeller sealed within a pump housing and hydraulically suspended within the pump housing. The pump impeller includes a magnet and is a rotor of a brushless direct current (DC) motor that is driven by electrical signals through stator coils in the pump housing, creating a rotating magnetic field. The rotating magnetic field attracts the magnetized impeller and spins it with the rotating field. The controller provides field-oriented control for the brushless DC motor in the blood pump. The field-oriented control in the controller is provided in a programmable logic device separate from the control processor, so that software or hardware failures related to the control processor do not stop the blood pump. The field-oriented control allows sensing of blood flow through the pump without having a sensor in the blood flow.

The application discloses a solar transmittance temperature self-adjusting radiative cooling bacterial cellulose liquid crystal composite film and a preparation method thereof. The composite film is prepared by immersing silanized bacterial cellulose film in a prepared liquid crystal mixture and then performing field orientation and ultraviolet light irradiation curing. The whole preparation process comprises preparation of the silanized bacterial cellulose film, preparation of the liquid crystal mixture, surface spin coating and modification treatment of ITO glass, and preparation of the radiative cooling bacterial cellulose liquid crystal composite film. The radiative cooling bacterial cellulose liquid crystal composite film provided by the application has a transmittance that can be greatly adjusted in the solar spectrum range, has a high emissivity characteristic in the atmospheric window (8-13 mu m), is self-supporting and light in mass, has excellent radiative cooling and building energy saving performance, and has great application potential and market value.

The invention relates to the technical field of servo motor control, and provides an initial electrical angle self-calibration method and device for servo motor control and a storage medium. The method comprises the steps that a controller controls a power circuit to inject preset direct-current exciting current into a winding of the servo motor so as to generate a stator resultant magnetic field with the fixed direction, and a rotor permanent magnet is pulled and aligned to the fixed stator resultant magnetic field direction; after it is judged that the rotor alignment is stable, an alignment mechanical angle output by the magnetoelectric encoder is read; the electrical angle offset between the installation zero point of the magnetoelectric encoder and the electrical zero point of the servo motor is calculated and obtained; the electrical angle offset serves as a control parameter to be stored in a nonvolatile memory, and initial electrical angle self-calibration is completed; after the self-calibration control process is completed, based on the electrical angle offset stored in the nonvolatile memory, real-time calculation is carried out to obtain a real-time electrical angle used for executing field-oriented control; based on the real-time electrical angle, the controller performs field-oriented control on the servo motor.

The invention relates to the technical field of motor control, discloses a motor control method and device, and aims to perform iron loss compensation on current distribution in torque control, rotor flux linkage estimation of a voltage model and slip calculation oriented according to a rotor field on the basis of asynchronous motor control considering an iron loss model. The influence of the iron loss on the vector control of the asynchronous motor is systematically reduced, and the iron loss resistance is obtained in an off-line experiment calibration mode, so that the complexity of a control system is reduced.

This invention provides a two-dimensional tunable holographic metasurface and its control method based on a low-profile, fully polarized, wide-angle, near-field beamforming system. The metasurface includes a top metal plate with a T-shaped coupling structure array on it. The T-shaped coupling structure array includes multiple novel coupling units, and each novel coupling unit has a radio frequency (RF) switch in both the vertical and horizontal directions for controlling coupled radiation. An FPGA control circuit and a direct feed network are located on the lower layer of a second dielectric substrate. The DC feed network applies different DC bias voltages to the center of each novel coupling unit to control the on / off state of the RF switches. This invention has the advantages of simple structure and low cost, and can easily realize multi-polarized beams with arbitrary far / near field orientations, achieving beam scanning in elevation and azimuth angles. It can achieve wide-angle ±70° scanning of far-field pencil beams and wide-angle ±60° scanning of near-field Bessel beams.

In described examples, a device includes a processor and a non-transitory memory storing instructions that, when executed, cause the processor to operate in an open loop mode a motor that includes a rotor and a stator. An angle error of the rotor is determined. In response to the angle error of the rotor being less than a threshold, the processor transitions from operating the motor in the open loop mode to operating the motor in a closed loop mode by changing from using a first coordinate system based on a command rotor position to using a second coordinate system based on an estimated rotor position to determine current vectors used to control the motor; and holding constant a current vector used to control the motor while performing the changing action. After performing the changing and holding actions, the processor operates the motor in the closed loop mode.

The application discloses a single-resistance phase current sampling method and system and a computer storage medium, and relates to the technical field of three-phase motor magnetic field orientation control.The application enables the pre-loading register of the PWM timer peripheral device, and utilizes the timer overflow interrupt and the ADC conversion end interrupt to trigger the ADC sampling through the same ADC comparison channel in two different count stages of the PWM cycle, and after the two times of sampling are completed, the three-phase current reconstruction and FOC operation are completed in an ADC interrupt, the new three-way PWM comparison threshold and the new ADC comparison threshold of the next FOC control cycle are obtained, and the pre-loading register is written in the subsequent timer overflow interrupt, so that the phase current sampling and the FOC closed-loop control are continuously completed in a cycle mode.The application does not need the DMA peripheral device, the special PWM updating mechanism and the special ADC triggering mechanism, and can realize the accurate single-resistance phase current sampling only by using the ordinary PWM peripheral device and the ADC peripheral device, so that the adaptability and the software universality of the MCU are improved, and the hardware cost is reduced.

A method for operating a linear compressor of an appliance, such as a refrigerator appliance, is provided. In one example implementation, the method can include operating a motor of the linear compressor in order to drive a rotor of the motor. The method can further include obtaining, via a controller of the linear compressor, one or more feedback measurements of one or more electrical characteristics of the motor. The method can further include controlling, based at least in part on the one or more feedback measurements, the motor of the linear compressor using a single-phase vector-like control scheme.

The application discloses a motor torque control method, device, equipment, storage medium and product, relates to the motor technical field, and the motor torque control method comprises the following steps: when the vehicle is in the battery active heating mode, the motor is controlled to be switched between two preset working points to maintain the torque accuracy in the battery heating process, wherein one of the two working points is used for calibrating the magnetic field orientation angle, and the other working point is used for keeping the heating power based on the calibrated magnetic field orientation angle. The application realizes that the torque accuracy of the vehicle can be guaranteed while the battery is heated.

The present invention discloses a hob steel for rock layer ground excavators and its preparation method, belonging to the field of hob steel materials. The hob steel comprises, from the inside to the outside, a steel matrix structure and a surface self-lubricating coating. The matrix structure is an inner layer: a 30CrNiMo steel matrix containing nano-TiN particles; an intermediate layer: a Fe-TiC gradient composite material; an outer layer: a WC-10Co layer; a surface self-lubricating coating: a bottom layer of magnetron sputtered TiAlN and CrN layers; an intermediate layer: an Al2O3-SiC porous transition layer; and a surface layer: a lubricant and microcapsules. The hob steel adopts a gradient nano-enhanced matrix: an inner layer of 30CrNiMo steel + nano-TiN particles, an intermediate layer of Fe-TiC gradient transition, and an outer layer of WC-10Co high-hardness layer; a magnetic field synergistic process, magnetic field oriented grains, and pulse quenching to refine the structure; and a synergistic design of the surface self-lubricating coating to solve the problems of traditional hob steel with unbalanced hardness and toughness, short lubrication life, and poor environmental performance.

The invention relates to the technical field of motor control, and discloses a permanent magnet synchronous motor control method and system and a program product, and the method comprises the following steps: an analog-to-digital converter collects the operation parameters of a motor and converts the operation parameters into digital signals; the field-oriented control module calculates a current voltage vector of the motor by adopting a field-oriented control method after the analog-to-digital converter finishes converting the operating parameters into the digital signals; the modulation module emits pulse width modulation waves with the same frequency as the sampling frequency of the analog-to-digital converter based on the current voltage vector of the motor; wherein the frequency of the pulse width modulation wave is K times of the operation frequency of the field-oriented control method, and K is greater than or equal to 2 and is an integer. The method solves the problems that in the prior art, it is difficult to reduce the harmonic content and torque pulsation while reducing the execution frequency of a control algorithm, and it is difficult to guarantee the control performance of the motor.

The present invention discloses an electric wheelchair system utilizing sliding-mode synchronous control and magnetic field-oriented control. This system, belonging to the field of electric wheelchair control technology, comprises a rocker controller, a motor drive module, and a control assembly. Both the left signal acquisition module and the right signal acquisition module include a sliding-mode synchronous control processor and a magnetic field-oriented control processor. The magnetic field-oriented control processor is connected to the sliding-mode synchronous control processor. The magnetic field-oriented control processor is configured to obtain a speed deviation between the left and right motors when the motor drive module experiences significant torque pulsation. After obtaining this speed deviation, the sliding-mode synchronous control processor synchronizes the speeds of the left and right motors. This solution addresses the issues of existing electric wheelchair systems using square-wave control systems, which can result in significant torque pulsation, unstable rotation, and poor noise performance in the drive unit.

The invention relates to a magnetic fiber composite hydrogel material with orientation arrangement regulated and controlled by a magnetic field and a preparation method of the magnetic fiber composite hydrogel material, and the preparation method of the magnetic fiber composite hydrogel material comprises the following steps: preparing magnetic nano short fibers from polylactic acid PLLA and ferroferric oxide Fe3O4 nano particles; then modifying the surface of the magnetic nano short fiber by potassium permanganate KMnO4 to obtain Mn2O3 modified magnetic nano short fiber; and finally, compounding the Mn2O3 modified magnetic nano short fibers with methacrylated silk fibroin SilMA, and constructing the magnetic fiber composite hydrogel material with an ordered structure by taking a bacterial cellulose BC membrane as a substrate and combining a magnetic field directional arrangement and ultraviolet crosslinking technology. The magnetic fiber composite hydrogel material obtained by the preparation method of the magnetic fiber composite hydrogel material can significantly enhance mechanical properties and anisotropy, has multiple composite functions, has a structure with excellent controllability, and can realize highly oriented arrangement.

The invention discloses a dual three-phase motor modulation method based on dynamic zero vector distribution, and the method comprises the following steps: S1, building dual three-phase motor field orientation control based on vector space decoupling, and calculating the output original voltage of each axis; s2, calculating a reference voltage vector of the two voltage source inverters in a static coordinate system according to the output voltage of each axis, and calculating the output voltage of each phase in the dual three-phase motor; s3, calculating a zero vector difference value of the two voltage source inverters according to the output voltage of each phase; s4, the effective voltage vector action time of the two voltage source inverters is calculated, and then the total action time of corresponding zero vectors is obtained; s5, dynamically distributing zero vector action moments of the two voltage source inverters according to the zero vector difference value and the zero vector total time of the two voltage source inverters; and the conduction time of each switching tube is calculated in combination with the effective vector action time.

The application discloses a kind of based on three-dimensional stereo winding intelligent ring NFC system, it is related to near field communication technology and wearable device technical field.The system includes: high-frequency magnetic core module is set in the inside of intelligent ring, is made using soft magnetic material of high magnetic permeability and low loss rate;Stereo winding coil module is formed by three-dimensional winding of metal wire along the bottom and side surface of high-frequency magnetic core module, and is wound on the outer periphery of high-frequency magnetic core module;The two ends of connection terminal module and stereo winding coil module are electrically connected, for coupling to NFC chip;Encapsulating body module is covered high-frequency magnetic core module and stereo winding coil module by preset encapsulating material.Through block magnetic core and bottom plus side surface three-dimensional stereo coil, magnetic field orientation and human body interference suppression are realized;Through actual measurement screening plus simulation optimization, the size of magnetic core, number of turns and encapsulating thickness are determined, improve wearing reading distance, communication success rate, while improving bandwidth tolerance.

The application relates to the field of asynchronous motor control, in particular to a method for calculating the rotor time constant of an asynchronous motor driven by a frequency converter, which comprises the following steps: during the operation of the asynchronous motor, the three-phase voltage value and the three-phase current value of the asynchronous motor are sampled, and a voltage-current initial model is established according to the sampling results. The voltage equation of the asynchronous motor and the indirect magnetic field oriented vector control equation are used to perform Clark transformation on the voltage-current initial model, so that an adjustable model is obtained, the adjustable model is a model containing the rotor time constant and not containing the stator resistance; the error between the voltage-current initial model and the adjustable model is calculated, the error is adjusted by using proportional integral, and the rotor time constant of the asynchronous motor is obtained. The obtained result has better real-time effectiveness, avoids the precision error caused by factors such as temperature fluctuation and voltage fluctuation generated during the operation of the motor, and is also effective in the working scene of low-speed light load of the asynchronous motor.