26 results about "Field orientation" patented technology

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).

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 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.

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.

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 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.

The invention provides a self-adaptive fuzzy sliding mode control system for a mobile robot, and the system is configured to execute the following control processes: step 1, calculating a pose error between an actual pose and an expected track of the mobile robot based on the input of a multi-source sensor system; step 2, executing an adaptive fuzzy sliding mode control algorithm; 3, executing a field-oriented control algorithm: converting the linear velocity and angular velocity control signals into a phase current instruction for a brushless direct current motor through a field-oriented control technology so as to realize high-precision torque and rotating speed control; step 4, updating pose estimation through sensor data fusion, forming closed-loop control, and realizing robust trajectory tracking in an uncertain dynamic environment; through deep cooperation of the AFSMC and the FOC, dual-core task partitioning and continuous switching functions, the system can effectively suppress high-frequency buffeting, and meanwhile, the tracking precision and the energy efficiency are improved. The method is suitable for various mobile robot platforms.

The invention discloses a motor controller software FOC task timeout detection method and device based on a GTM channel. An output level value of an advanced timer output module of a general timer module is used as a time reference of a field-oriented control period; after the sampling is finished, triggering an interrupt execution direct memory access channel to trigger and execute a field-oriented control task; reading a reference level value output by an advanced timer output module before the execution of the field-oriented control task is started; setting a task cycle time timeout threshold value based on an advanced timer output module, comparing the level value when the magnetic field orientation control task starts to be executed with the level value when the magnetic field orientation control task ends, if the level values are kept consistent, considering that the magnetic field orientation control task is not overtime, and if the level values pass the detection, judging that the magnetic field orientation control task is overtime. If the level values are different, it is considered that timeout occurs in the field-oriented control task, and the specific task causing the timeout processing action can be accurately positioned.

The application relates to the technical field of motor control, and discloses a motor non-inductive magnetic field orientation control direct starting method and device and electronic equipment, the method comprising the following steps: obtaining an estimated rotating speed of a motor; when the estimated rotating speed meets a first preset condition, driving the motor to operate by open-loop control rotating speed and continuously updating the estimated rotating speed, so that the updated estimated rotating speed gradually converges to the actual rotating speed of the motor; and when the updated estimated rotating speed meets a second preset condition, driving the motor to operate by the updated estimated rotating speed as closed-loop control rotating speed. According to the application, automatic switching between open-loop control and closed-loop control can be realized only according to whether the estimated rotating speed meets the preset condition, the switching process does not need to perform angle synchronization, rotating speed correction or switching buffer processing, the switching logic is simplified, current impact and out-of-step phenomena in the switching process are eliminated, and smooth transition from open-loop control to closed-loop control is realized.

According to the high-wear-resistance bronze alloy for the industrial robot speed reducer, the composition of the alloy is limited, good wear resistance can be synchronously maintained when the content of manganese and aluminum is reduced, and the principle is as follows: silicon is dissolved in the alloy in a solid mode to hinder dislocation movement, manganese forms a solid solution, the dislocation movement is hindered through lattice distortion, and the alloy has good wear resistance; tin is dissolved in the alloy in a solid mode and can be separated out during heat treatment, then grains are refined, zinc is dissolved in the alpha phase of bronze, the microstructure of the alloy is improved, meanwhile, ultrasonic and magnetic field orientation treatment is added during forming, and under the cooperation of ultrasonic and magnetic fields, micro movement of Fe, Ni and the like is promoted, dynamic recrystallization of the alpha phase is promoted, and crystal refining is promoted. And under the matching, the wear resistance of the copper alloy is greatly improved.

The application relates to a double-coil micro-nano soft-magnetic and hard-magnetic particle composite magnetic control enhanced 3D printing device and a method thereof. The device comprises a magnetic composite material, a driving wheel, a pulse magnetizing coil, a constant-field magnetizing coil, a ceramic heating ring, a nozzle and a hot bed. The application adopts an innovative two-stage synergistic regulation strategy, that is, a technical means combining solid-state pre-magnetization and melt constant-field orientation, and precisely controls different magnetic properties of soft-magnetic particles and hard-magnetic neodymium-iron-boron particles. In the printing process, by regulating the magnetic field intensity of the pulse magnetizing coil and the constant-field magnetizing coil, the directional arrangement of the soft-magnetic and hard-magnetic particles is realized, and the efficient arrangement of the reinforcing materials such as carbon fibers is driven. This significantly improves the mechanical properties of the printed structure in the particle arrangement direction. By accurately matching the dynamic magnetic field intensity and the hot bed temperature, the application ensures that the magnetic composite material realizes high-precision arrangement in the whole process of conveying, extruding and the like, so that a complex part with excellent mechanical properties is printed.

The invention discloses a variable-speed constant-frequency synchronous motor flux linkage observation method, device and equipment, and belongs to the technical field of synchronous generator flux linking.The method comprises the steps that in the steady state of a permanent magnet synchronous generator, a voltage equation including permanent magnet flux linkage is established according to the voltage and current of the quadrature axis and the direct axis of the permanent magnet synchronous motor; transforming the voltage equation through an innovation RLS algorithm to obtain a flux linkage innovation matrix; performing recursive transformation according to the flux linkage innovation matrix to obtain a permanent magnet flux linkage parameter identification equation; and observing permanent magnet flux linkage parameters of the synchronous motor according to the flux linkage parameter identification equation. Therefore, the identification process parameters are adaptively adjusted through the innovation, and the problem of data saturation is solved. The adaptive mechanism obtains optimal balance between the dynamic state and the steady state, and the problem of estimation variance caused by fixed parameters is avoided. And the observed accurate flux linkage value is fed back to the controller, so that the decoupling effect of field-oriented control can be optimized, the torque pulsation is reduced, and the power generation efficiency and the system reliability are further improved.

The application discloses a kind of multi-time scale adaptive magnetic field oriented control methods of robot joint motor, it is related to motor control technical field, by constructing electrical time scale current observer and mechanical time scale speed observer, realize the on-line adaptation of electrical parameter and mechanical parameter change.System acquires motor three-phase current and rotor position signal, after coordinate transformation, using the estimated value of the output of observer to generate compensation signal, correct the reference input of current loop and speed loop, and through Lyapunov stability theory design adaptive law, ensure that observation error converges, finally through SVPWM generates PWM signal to drive motor.The method improves the precision, dynamic response and robustness of robot joint control.